@article{qi_li_hong_zhao_qing_yin_2024, title={Defected twisted ring topology for autonomous periodic flip-spin-orbit soft robot}, volume={121}, ISSN={["1091-6490"]}, DOI={10.1073/pnas.231268012}, number={3}, journal={PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA}, author={Qi, Fangjie and Li, Yanbin and Hong, Yaoye and Zhao, Yao and Qing, Haitao and Yin, Jie}, year={2024}, month={Jan} }
 @article{chi_zhao_hong_li_yin_2023, title={A Perspective on Miniature Soft Robotics: Actuation, Fabrication, Control, and Applications}, ISSN={["2640-4567"]}, DOI={10.1002/aisy.202300063}, abstractNote={Soft robotics enriches the robotic functionalities by engineering soft materials and electronics toward enhanced compliance, adaptivity, and friendly human machine. This decade has witnessed extraordinary progresses and benefits in scaling down soft robotics to small scale for a wide range of potential and promising applications, including medical and surgical soft robots, wearable and rehabilitation robots, and unconstructed environments exploration. This perspective highlights recent research efforts in miniature soft robotics in a brief and comprehensive way in terms of actuation, powering, designs, fabrication, control, and applications in four sections. Section 2 discusses the key aspects of materials selection and structural designs for small‐scale tethered and untethered actuation and powering, including fluidic actuation, stimuli‐responsive actuation, and soft living biohybrid materials, as well as structural forms from 1D to 3D. Section 3 discusses the advanced manufacturing techniques at small scales for fabricating miniature soft robots, including lithography, mechanical self‐assembly, additive manufacturing, tissue engineering, and other fabrication methods. Section 4 discusses the control systems used in miniature robots, including off‐board/onboard controls and artificial intelligence‐based controls. Section 5 discusses their potential broad applications in healthcare, small‐scale objects manipulating and processing, and environmental monitoring. Finally, outlooks on the challenges and opportunities are discussed.}, journal={ADVANCED INTELLIGENT SYSTEMS}, author={Chi, Yinding and Zhao, Yao and Hong, Yaoye and Li, Yanbin and Yin, Jie}, year={2023}, month={Apr} }
 @article{chen_hong_fu_nandi_xie_yin_hsu_2023, title={A kirigami-enabled electrochromic wearable variable-emittance device for energy-efficient adaptive personal thermoregulation}, volume={2}, ISSN={["2752-6542"]}, DOI={10.1093/pnasnexus/pgad165}, abstractNote={Abstract}, number={6}, journal={PNAS NEXUS}, author={Chen, Ting-Hsuan and Hong, Yaoye and Fu, Ching-Tai and Nandi, Ankita and Xie, Wanrong and Yin, Jie and Hsu, Po-Chun}, year={2023}, month={May} }
 @article{wang_dong_li_ryu_dong_chen_dai_ke_yin_long_2023, title={A solar/radiative cooling dual-regulation smart window based on shape-morphing kirigami structures}, ISSN={["2051-6355"]}, DOI={10.1039/d3mh00671a}, abstractNote={A kirigami-inspired smart window is presented with a solar/radiative cooling dual-control function and improved durability. It is promising for building energy saving and outperforms state-of-the-art dual-regulation smart windows in the literature.}, journal={MATERIALS HORIZONS}, author={Wang, Shancheng and Dong, Yuting and Li, Yanbin and Ryu, Keunhyuk and Dong, Zhili and Chen, Jian and Dai, Zhendong and Ke, Yujie and Yin, Jie and Long, Yi}, year={2023}, month={Jul} }
 @article{hong_zhao_berman_chi_li_huang_yin_2023, title={Angle-programmed tendril-like trajectories enable a multifunctional gripper with ultradelicacy, ultrastrength, and ultraprecision}, volume={14}, ISSN={["2041-1723"]}, DOI={10.1038/s41467-023-39741-6}, abstractNote={Abstract}, number={1}, journal={NATURE COMMUNICATIONS}, author={Hong, Yaoye and Zhao, Yao and Berman, Joseph and Chi, Yinding and Li, Yanbin and Huang, He and Yin, Jie}, year={2023}, month={Aug} }
 @article{ke_li_liu_zhu_wang_li_lin_zhang_hu_dong_et al._2023, title={Bio-Inspired, Scalable, and Tri-Mode Stimuli-Chromic Composite for Smart Window Multifunctionality}, ISSN={["1616-3028"]}, DOI={10.1002/adfm.202305998}, abstractNote={Abstract}, journal={ADVANCED FUNCTIONAL MATERIALS}, author={Ke, Yujie and Li, Na and Liu, Yan and Zhu, Tingting and Wang, Shancheng and Li, Yanbin and Lin, Gaojian and Zhang, Qiuting and Hu, Yuwei and Dong, Zhaogang and et al.}, year={2023}, month={Sep} }
 @article{wu_hong_zhao_yin_zhu_2023, title={Caterpillar-inspired soft crawling robot with distributed programmable thermal actuation}, volume={9}, ISSN={["2375-2548"]}, DOI={10.1126/sciadv.adf8014}, abstractNote={Many inspirations for soft robotics are from the natural world, such as octopuses, snakes, and caterpillars. Here, we report a caterpillar-inspired, energy-efficient crawling robot with multiple crawling modes, enabled by joule heating of a patterned soft heater consisting of silver nanowire networks in a liquid crystal elastomer (LCE)–based thermal bimorph actuator. With patterned and distributed heaters and programmable heating, different temperature and hence curvature distribution along the body of the robot are achieved, enabling bidirectional locomotion as a result of the friction competition between the front and rear end with the ground. The thermal bimorph behavior is studied to predict and optimize the local curvature of the robot under thermal stimuli. The bidirectional actuation modes with the crawling speeds are investigated. The capability of passing through obstacles with limited spacing are demonstrated. The strategy of distributed and programmable heating and actuation with thermal responsive materials offers unprecedented capabilities for smart and multifunctional soft robots.}, number={12}, journal={SCIENCE ADVANCES}, author={Wu, Shuang and Hong, Yaoye and Zhao, Yao and Yin, Jie and Zhu, Yong}, year={2023}, month={Mar} }
 @article{ke_ruan_li_wang_wang_zhang_pan_nair_yin_yang_2023, title={Engineering Dynamic Structural Color Pixels at Microscales by Inhomogeneous Strain-Induced Localized Topographic Change}, ISSN={["1530-6992"]}, DOI={10.1021/acs.nanolett.3c00808}, abstractNote={Structural colors in homogeneous elastomeric materials predominantly exhibit uniform color changes under applied strains. However, juxtaposing mechanochromic pixels that exhibit distinct responses to applied strain remains challenging, especially on the microscale where the demand for miscellaneous spectral information increases. Here, we present a method to engineer microscale switchable color pixels by creating localized inhomogeneous strain fields at the level of individual microlines. Trenches produced by transfer casting from 2.5D structures into elastomers exhibit a uniform structural color in the unstretched state due to interference and scattering effects, while they show different colors under an applied uniaxial strain. This programmable topographic change resulting in color variation arises from strain mismatch between layers and trench width. We utilized this effect to achieve the encryption of text strings with Morse code. The effective and facile design principle is promising for diverse optical devices based on dynamic structures and topographic changes.}, journal={NANO LETTERS}, author={Ke, Yujie and Ruan, Qifeng and Li, Yanbin and Wang, Hao and Wang, Hongtao and Zhang, Wang and Pan, Chengfeng and Nair, Parvathi Nair Suseela and Yin, Jie and Yang, Joel K. W.}, year={2023}, month={Jun} }
 @article{zhao_hong_li_qi_qing_su_yin_2023, title={Physically intelligent autonomous soft robotic maze escaper}, volume={9}, ISSN={["2375-2548"]}, DOI={10.1126/sciadv.adi3254}, abstractNote={Autonomous maze navigation is appealing yet challenging in soft robotics for exploring priori unknown unstructured environments, as it often requires human-like brain that integrates onboard power, sensors, and control for computational intelligence. Here, we report harnessing both geometric and materials intelligence in liquid crystal elastomer–based self-rolling robots for autonomous escaping from complex multichannel mazes without the need for human-like brain. The soft robot powered by environmental thermal energy has asymmetric geometry with hybrid twisted and helical shapes on two ends. Such geometric asymmetry enables built-in active and sustained self-turning capabilities, unlike its symmetric counterparts in either twisted or helical shapes that only demonstrate transient self-turning through untwisting. Combining self-snapping for motion reflection, it shows unique curved zigzag paths to avoid entrapment in its counterparts, which allows for successful self-escaping from various challenging mazes, including mazes on granular terrains, mazes with narrow gaps, and even mazes with in situ changing layouts.}, number={36}, journal={SCIENCE ADVANCES}, author={Zhao, Yao and Hong, Yaoye and Li, Yanbin and Qi, Fangjie and Qing, Haitao and Su, Hao and Yin, Jie}, year={2023}, month={Sep} }
 @article{mu_li_chen_yang_yin_tao_liu_yin_2023, title={Spiral-Shape Fast-Moving Soft Robots}, volume={5}, ISSN={["1616-3028"]}, url={https://doi.org/10.1002/adfm.202300516}, DOI={10.1002/adfm.202300516}, abstractNote={Abstract}, journal={ADVANCED FUNCTIONAL MATERIALS}, author={Mu, Weilei and Li, Mengjiao and Chen, Erdong and Yang, Yiduo and Yin, Jie and Tao, Xiaoming and Liu, Guijie and Yin, Rong}, year={2023}, month={May} }
 @misc{chi_li_zhao_hong_tang_yin_2022, title={Bistable and Multistable Actuators for Soft Robots: Structures, Materials, and Functionalities}, volume={34}, ISSN={["1521-4095"]}, DOI={10.1002/adma.202110384}, abstractNote={Abstract}, number={19}, journal={ADVANCED MATERIALS}, author={Chi, Yinding and Li, Yanbin and Zhao, Yao and Hong, Yaoye and Tang, Yichao and Yin, Jie}, year={2022}, month={May} }
 @article{hong_chi_wu_li_zhu_yin_2022, title={Boundary curvature guided programmable shape-morphing kirigami sheets}, volume={13}, ISSN={["2041-1723"]}, DOI={10.1038/s41467-022-28187-x}, abstractNote={Abstract}, number={1}, journal={NATURE COMMUNICATIONS}, author={Hong, Yaoye and Chi, Yinding and Wu, Shuang and Li, Yanbin and Zhu, Yong and Yin, Jie}, year={2022}, month={Jan} }
 @article{ke_li_wu_wang_yang_yin_tan_long_2022, title={On-Demand Solar and Thermal RadiationManagement Based on Switchable Interwoven Surfaces}, volume={7}, ISSN={["2380-8195"]}, DOI={10.1021/acsenergylett.2c00419}, abstractNote={On-demand and selective regulation of the radiative cooling (long-wave infrared, LWIR) and solar heat gain (ultraviolet-, visible- and near-IR, UV–vis–NIR) of building facades is a grand challenge but essential to decrease energy usage in buildings. Here, we report a reconfigurable interwoven surface that can dynamically switch the overlapping sequence to achieve spectral selectivity and ultrabroadband modulations for windows, walls/roofs with decent spectral modulations, and energy-saving performance. The result surpasses the best reported passive radiative cooling smart windows with a more than doubled visible transmittance (Tlum = 0.50) and LWIR modulation (Δ εLWIR = 0.57). Our energy-saving samples outperform the commercial building materials across climate zones 2–6. This design principle is scalable and applicable for diverse materials, interwoven structures, and 2D-3D surfaces, which provide a strategy to give programmable heating/cooling modulations in various applications.}, number={5}, journal={ACS ENERGY LETTERS}, author={Ke, Yujie and Li, Yanbin and Wu, Lichen and Wang, Shancheng and Yang, Ronggui and Yin, Jie and Tan, Gang and Long, Yi}, year={2022}, month={May}, pages={1758–1763} }
 @article{zhao_hong_qi_chi_su_yin_2022, title={Self-Sustained Snapping Drives Autonomous Dancing and Motion in Free-Standing Wavy Rings}, volume={12}, ISSN={["1521-4095"]}, DOI={10.1002/adma.202207372}, abstractNote={Abstract}, journal={ADVANCED MATERIALS}, author={Zhao, Yao and Hong, Yaoye and Qi, Fangjie and Chi, Yinding and Su, Hao and Yin, Jie}, year={2022}, month={Dec} }
 @article{chi_hong_zhao_li_yin_2022, title={Snapping for high-speed and high-efficient butterfly stroke-like soft swimmer}, volume={8}, ISSN={["2375-2548"]}, DOI={10.1126/sciadv.add3788}, abstractNote={Natural selection has tuned many flying and swimming animals to share the same narrow design space for high power efficiency, e.g., their dimensionless Strouhal numbers St that relate flapping frequency and amplitude and forward speed fall within the range of 0.2 < St < 0.4 for peak propulsive efficiency. It is rather challenging to achieve both comparably fast-speed and high-efficient soft swimmers to marine animals due to the naturally selected narrow design space and soft body compliance. Here, bioinspired by the flapping motion in swimming animals, we report leveraging snapping instabilities for soft flapping-wing swimmers with comparable high performance to biological counterparts. The lightweight, butterfly stroke–like soft swimmer (2.8 g) demonstrates a record-high speed of 3.74 body length/s (4.8 times faster than the reported fastest flapping soft swimmer), high power efficiency (0.2 < St = 0.25 < 0.4), low energy consumption cost, and high maneuverability (a high turning speed of 157°/s).}, number={46}, journal={SCIENCE ADVANCES}, author={Chi, Yinding and Hong, Yaoye and Zhao, Yao and Li, Yanbin and Yin, Jie}, year={2022}, month={Nov} }
 @article{li_zhang_hong_yin_2021, title={3D Transformable Modular Kirigami Based Programmable Metamaterials}, ISSN={["1616-3028"]}, DOI={10.1002/adfm.202105641}, abstractNote={Abstract}, journal={ADVANCED FUNCTIONAL MATERIALS}, author={Li, Yanbin and Zhang, Qiuting and Hong, Yaoye and Yin, Jie}, year={2021}, month={Jul} }
 @article{wu_baker_yin_zhu_2021, title={Fast Thermal Actuators for Soft Robotics}, ISSN={["2169-5180"]}, DOI={10.1089/soro.2021.0080}, abstractNote={Thermal actuation is a common actuation method for soft robots. However, a major limitation is the relatively slow actuation speed. Here we report significant increase in the actuation speed of a bimorph thermal actuator by harnessing the snap-through instability. The actuator is made of silver nanowire/polydimethylsiloxane composite. The snap-through instability is enabled by simply applying an offset displacement to part of the actuator structure. The effects of thermal conductivity of the composite, offset displacement, and actuation frequency on the actuator speed are investigated using both experiments and finite element analysis. The actuator yields a bending speed as high as 28.7 cm-1/s, 10 times that without the snap-through instability. A fast crawling robot with locomotion speed of 1.04 body length per second and a biomimetic Venus flytrap were demonstrated to illustrate the promising potential of the fast bimorph thermal actuators for soft robotic applications.}, journal={SOFT ROBOTICS}, author={Wu, Shuang and Baker, Gregory Langston and Yin, Jie and Zhu, Yong}, year={2021}, month={Dec} }
 @article{li_song_liu_yin_2021, title={Geometric mechanics of folded kirigami structures with tunable bandgap}, volume={49}, ISSN={["2352-4316"]}, DOI={10.1016/j.eml.2021.101483}, abstractNote={We study the geometric mechanics and tunable band structures of a recently developed new class of folded kirigami structures through experiments, theoretical modeling, and numerical simulation. The folded kirigami structures with square and triangular cut patterns are constructed by replacing the point hinge in conventional kirigami sheets with a 3D folding hinge. We find that the folded design can effectively overcome the polarization constraint in the conventional kirigami sheets without folds. Specially, as the creases continue to fold from 0° to 180°, the folded design achieves a unique polarization switch, i.e., the structure expands first and then shrinks to be even smaller than that before folding. Geometric mechanics models are developed to predict how the geometry of the folding hinges determines both the shape changes and structural responses, including nominal strains, polarization switch, Poisson’s ratio, folding rate, surface porosity, and structural stiffness. The models are validated through related experiments. We find that the observed polarization switch corresponds to both the peak nominal strains and stiffness singularity in the structures. Lastly, we numerically explore its shape change induced tunable phononic bandgap structures. We find that for special designs with polarization switch, it leads to symmetric bandgap structures changing with the folding angle. This work could find potential applications in designing kirigami metamaterials, shape-morphing materials, and phononic materials with tunable band structures.}, journal={EXTREME MECHANICS LETTERS}, author={Li, Yanbin and Song, Xiaolei and Liu, Haijun and Yin, Jie}, year={2021}, month={Nov} }
 @article{li_yin_2021, title={Metamorphosis of three-dimensional kirigami-inspired reconfigurable and reprogrammable architected matter}, volume={21}, ISSN={["2542-5293"]}, DOI={10.1016/j.mtphys.2021.100511}, abstractNote={Most shape-morphing materials are limited to one-to-one shape-changing process, i.e., one design corresponds to one target shape, thus it is hard to be reshaped due to the constraint of limited mobilities (degrees of freedom). Here, we propose harnessing kinematic bifurcation in mechanisms with multiple branched transformation paths to achieve enhanced reconfigurability and shape reprogrammability in a new class of three-dimensional (3D) kirigami-inspired architected matter. The reconfigurable and reprogrammable architected matter is constructed from planar tessellation of 3D kirigami-inspired transformable modules. The module consisting of eight closed-loop connected cubes exhibits both 3D non-bifurcated and bifurcated transformation modes, the motions of which are well captured by the developed kinematics model. The modules can be periodically tessellated in plane to form a flat, thick panel in both a diluted (with voids) and compact (without voids) pattern with multiple encoded, compatible transformation modes. Consequently, it can undergo a series of consecutive shape changes by reconfiguring into varieties of 3D transformable architectures that are conceptually in analogy to metamorphosis in some living organisms during growth. The endowed rich mobilities are found to derive from the kinematic bifurcation. Among them, a unique transformed 3D architecture can be further reprogrammed to reconfigure into multiple architected shapes with zero and non-zero Gaussian curvature through both forward and inverse designs. Such 3D reconfigurable kinematic matter is attractive for potential applications in reconfigurable metamaterials and morphing architectures.}, journal={MATERIALS TODAY PHYSICS}, author={Li, Yanbin and Yin, Jie}, year={2021}, month={Nov} }
 @article{jia_fernandes_deng_yang_zhang_lethbridge_yin_lee_han_weaver_et al._2021, title={Microstructural design for mechanical-optical multifunctionality in the exoskeleton of the flower beetle Torynorrhina flammea}, volume={118}, ISSN={["0027-8424"]}, DOI={10.1073/pnas.2101017118}, abstractNote={Significance}, number={25}, journal={PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA}, author={Jia, Zian and Fernandes, Matheus C. and Deng, Zhifei and Yang, Ting and Zhang, Qiuting and Lethbridge, Alfie and Yin, Jie and Lee, Jae-Hwang and Han, Lin and Weaver, James C. and et al.}, year={2021}, month={Jun} }
 @article{li_zhao_chi_hong_yin_2021, title={Shape-morphing materials and structures for energy-efficient building envelopes}, volume={22}, ISSN={["2468-6069"]}, DOI={10.1016/j.mtener.2021.100874}, abstractNote={Buildings account for 30% of global energy consumption. Improving the energy efficiency of buildings becomes essential to reducing energy consumption for alleviating their deteriorating impacts on the environment. As one of the key elements, the building envelope is essential to reducing the building energy consumption. Recent researches have demonstrated the promise of environmentally adaptive shape-morphing building envelopes in enhancing energy efficiency over the conventional stationary ones. In this review, we briefly discuss the recent advances in energy-efficient shape-morphing building envelopes from both structural designs and engineering materials viewpoints for energy saving and energy harvesting. For structural designs, we discuss the designs and performances of four representative categories of shape-morphing building envelopes, including conventional dynamic façades with simple rigid motions, biomimic adaptive structures, reconfigurable kirigami/origami-based structures, and morphable wrinkling surface–based smart windows. For materials design, we discuss the typical materials and design strategies used for actuating the shape-morphing building envelopes and smart windows. We expect that this brief review will be insightful for developing future shape-morphing building envelopes to make buildings more energetically efficient, comfortable, and environmentally friendly.}, journal={MATERIALS TODAY ENERGY}, author={Li, Yanbin and Zhao, Yao and Chi, Yinding and Hong, Yaoye and Yin, Jie}, year={2021}, month={Dec} }
 @article{ke_zhang_wang_wang_li_lin_liu_dai_yan_yin_et al._2020, title={Cephalopod-inspired versatile design based on plasmonic VO2 nanoparticle for energy-efficient mechano-thermochromic windows}, volume={73}, ISSN={["2211-3282"]}, DOI={10.1016/j.nanoen.2020.104785}, abstractNote={Privacy and energy-saving are key functionalities for next-generation smart windows, while to achieve them independently on a window is challenging. Inspired by the cephalopod skin, we have developed a versatile thermo- and mechano-chromic design to overcome such challenge and reveal the mechanism via both experiments and simulations. The design is facile with good scalability, consisted of well-dispersed vanadium dioxide (VO2) nanoparticles (NPs) with temperature-dependent localized surface plasmon resonance (LSPR) in transparent elastomers with dynamic micro wrinkles. While maintaining a fixed solar energy modulation of (ΔTsol), the design can dynamically control visible transmittance (Tvib) from 60% to 17%, adding a new dimension to VO2-based smart windows. We prove that the optical modulation relies on the microtexture-induced broadband diffraction and the plasmon-enhanced near-infrared absorbance of VO2 NPs. We further present a series of modified designs towards additional functionalities. This work opens an avenue for independent dual-mode windows and it may inspire development from fundamental material, optic, and mechanical science to energy-related applications.}, journal={NANO ENERGY}, author={Ke, Yujie and Zhang, Qiuting and Wang, Tao and Wang, Shancheng and Li, Na and Lin, Gaojian and Liu, Xinghai and Dai, Zhendong and Yan, Jing and Yin, Jie and et al.}, year={2020}, month={Jul} }
 @article{cui_yin_han_2020, title={Deciphering, Designing, and Realizing Self-Folding Biomimetic Microstructures Using a Mass-Spring Model and Inkjet-Printed, Self-Folding Hydrogels}, volume={30}, ISSN={["1616-3028"]}, DOI={10.1002/adfm.202003959}, abstractNote={Abstract}, number={39}, journal={ADVANCED FUNCTIONAL MATERIALS}, author={Cui, Chunxiao and Yin, Jie and Han, Li-Hsin}, year={2020}, month={Sep} }
 @article{chi_tang_liu_yin_2020, title={Leveraging Monostable and Bistable Pre-Curved Bilayer Actuators for High-Performance Multitask Soft Robots}, volume={5}, ISSN={["2365-709X"]}, DOI={10.1002/admt.202000370}, abstractNote={Abstract}, number={9}, journal={ADVANCED MATERIALS TECHNOLOGIES}, author={Chi, Yinding and Tang, Yichao and Liu, Haijun and Yin, Jie}, year={2020}, month={Sep} }
 @article{tang_chi_sun_huang_maghsoudi_spence_zhao_su_yin_2020, title={Leveraging elastic instabilities for amplified performance: Spine-inspired high-speed and high-force soft robots}, volume={6}, ISSN={["2375-2548"]}, url={https://publons.com/wos-op/publon/37034085/}, DOI={10.1126/sciadv.aaz6912}, abstractNote={Bistable spined soft robots enable high-speed cheetah-like galloping and fast-speed swimming, as well as high-force manipulation.}, number={19}, journal={SCIENCE ADVANCES}, author={Tang, Yichao and Chi, Yinding and Sun, Jiefeng and Huang, Tzu-Hao and Maghsoudi, Omid H. and Spence, Andrew and Zhao, Jianguo and Su, Hao and Yin, Jie}, year={2020}, month={May} }
 @article{ke_yin_zhang_tan_hu_wang_tang_zhou_wen_wu_et al._2019, title={Adaptive Thermochromic Windows from Active Plasmonic Elastomers}, volume={3}, ISSN={2542-4351}, url={http://dx.doi.org/10.1016/j.joule.2018.12.024}, DOI={10.1016/j.joule.2018.12.024}, abstractNote={Architectural windows that smartly regulate the indoor solar irradiation are promised to economize the building energy consumption. Here, we demonstrate a method for adaptive, broadband, and highly efficient solar modulation for energy-efficient smart windows through active plasmonics in reconfigurable structures. We develop a kirigami-inspired elastomer containing plasmonic vanadium dioxide (VO2) nanoparticles, in which the geometrical transition and the temperature-dependent localized surface plasmon resonance (LSPR) present dominant controls in ultraviolet-visible and near-infrared regions, respectively. The active LSPR control, via stretch-induced local dielectric changes is mitigated on reconfigurable metamaterials because of their unique strain distributions. This method demonstrated a desirable property in energy-efficient smart windows facilitating improved solar energy modulation (37.7%), surpassing the best-reported modulation in passive and transparent VO2 thermochromism systems. This first attempt to integrate the plasmonics and reconfigurable structures may inspire developments in smart windows, building energy economization, as well as fundamental studies of plasmonic controls in metastructures.}, number={3}, journal={Joule}, publisher={Elsevier BV}, author={Ke, Yujie and Yin, Yin and Zhang, Qiuting and Tan, Yutong and Hu, Peng and Wang, Shancheng and Tang, Yichao and Zhou, Yang and Wen, Xinglin and Wu, Shaofan and et al.}, year={2019}, month={Mar}, pages={858–871} }
 @article{zhang_zhang_yin_2019, title={Free‐Standing Buckle‐Delaminated 2D Organic Nanosheets with Enhanced Mechanical Properties and Multifunctionality}, volume={6}, ISSN={2196-7350 2196-7350}, url={http://dx.doi.org/10.1002/admi.201900561}, DOI={10.1002/admi.201900561}, abstractNote={Abstract}, number={17}, journal={Advanced Materials Interfaces}, publisher={Wiley}, author={Zhang, Qiuting and Zhang, Zhuolei and Yin, Jie}, year={2019}, month={Jul}, pages={1900561} }
 @article{zhang_yu_tang_guan_hu_yin_willets_ren_2019, title={Kirigami‐Inspired Stretchable Conjugated Electronics}, volume={6}, ISSN={2199-160X 2199-160X}, url={http://dx.doi.org/10.1002/aelm.201900929}, DOI={10.1002/aelm.201900929}, abstractNote={Abstract}, number={1}, journal={Advanced Electronic Materials}, publisher={Wiley}, author={Zhang, Zhuolei and Yu, Yun and Tang, Yichao and Guan, Ying‐shi and Hu, Yong and Yin, Jie and Willets, Katherine and Ren, Shenqiang}, year={2019}, month={Oct}, pages={1900929} }
 @article{seidel_roschger_li_bizzarro_zhang_yin_yang_weaver_fratzl_roschger_et al._2019, title={Mechanical properties of stingray tesserae: High-resolution correlative analysis of mineral density and indentation moduli in tessellated cartilage}, volume={96}, ISSN={1742-7061}, url={http://dx.doi.org/10.1016/j.actbio.2019.06.038}, DOI={10.1016/j.actbio.2019.06.038}, abstractNote={Skeletal tissues are built and shaped through complex, interacting active and passive processes. These spatial and temporal variabilities make interpreting growth mechanisms from morphology difficult, particularly in bone, where the remodeling process erases and rewrites local structural records of growth throughout life. In contrast to the majority of bony vertebrates, the elasmobranch fishes (sharks, rays, and their relatives) have skeletons made of cartilage, reinforced by an outer layer of mineralized tiles (tesserae), which are believed to grow only by deposition, without remodeling. We exploit this structural permanence, performing the first fine-scale correlation of structure and material properties in an elasmobranch skeleton. Our characterization across an age series of stingray tesserae allows unique insight into the growth processes and mechanical influences shaping the skeleton. Correlated quantitative backscattered electron imaging (qBEI) and nanoindentation measurements show a positive relationship between mineral density and tissue stiffness/hardness. Although tessellated cartilage as a whole (tesserae plus unmineralized cartilage) is considerably less dense than bone, we demonstrate that tesserae have exceptional local material properties, exceeding those of (mammal) bone and calcified cartilage. We show that the finescale ultrastructures recently described in tesserae have characteristic material properties suggesting distinct mechanical roles and that regions of high mineral density/stiffness in tesserae are confined predominantly to regions expected to bear high loads. In particular, tesseral spokes (laminated structures flanking joints) exhibit particularly high mineral densities and tissue material properties, more akin to teeth than bone or calcified cartilage. We conclude that these spokes toughen tesserae and reinforce points of contact between them. These toughening and reinforcing functions are supported by finite element simulations incorporating our material data. The high stresses predicted for spokes, and evidence we provide that new spoke laminae are deposited according to their local mechanical environment, suggest tessellated cartilage is both mutable and responsive, despite lacking remodeling capability. The study of vertebrate skeletal materials is heavily biased toward mammal bone, despite evidence that bone and cartilage are extremely diverse. We broaden the perspective on vertebrate skeleton materials and evolution in an investigation of stingray tessellated cartilage, a curious type of unmineralized cartilage with a shell of mineralized tiles (tesserae). Combining high-resolution imaging and material testing, we demonstrate that tesserae have impressive local material properties for a vertebrate skeletal tissue, arguing for unique tissue organization relative to mammalian calcified cartilage and bone. Incorporating our materials data into mechanical models, we show that finescale material arrangements allow this cartilage to act as a functional and responsive alternative to bone, despite lacking bone’s ability to remodel. These results are relevant to a diversity of researchers, from skeletal, developmental, and evolutionary biologists, to materials scientists interested in high-performance, low-density composites.}, journal={Acta Biomaterialia}, publisher={Elsevier BV}, author={Seidel, Ronald and Roschger, Andreas and Li, Ling and Bizzarro, Joseph J. and Zhang, Qiuting and Yin, Jie and Yang, Ting and Weaver, James C. and Fratzl, Peter and Roschger, Paul and et al.}, year={2019}, month={Sep}, pages={421–435} }
 @article{zhang_zhao_li_percec_yin_ren_2019, title={Nanoparticle-Infused UHMWPE Layer as Multifunctional Coating for High-Performance PPTA Single Fibers}, volume={9}, ISSN={2045-2322}, url={http://dx.doi.org/10.1038/s41598-019-43629-1}, DOI={10.1038/s41598-019-43629-1}, abstractNote={Abstract}, number={1}, journal={Scientific Reports}, publisher={Springer Science and Business Media LLC}, author={Zhang, Zhuolei and Zhao, Yao and Li, Haoqi and Percec, Simona and Yin, Jie and Ren, Fei}, year={2019}, month={May} }
 @article{tang_li_hong_yang_yin_2019, title={Programmable active kirigami metasheets with more freedom of actuation}, volume={116}, ISSN={["0027-8424"]}, DOI={10.1073/pnas.1906435116}, abstractNote={Significance}, number={52}, journal={PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA}, author={Tang, Yichao and Li, Yanbin and Hong, Yaoye and Yang, Shu and Yin, Jie}, year={2019}, month={Dec}, pages={26407–26413} }
 @misc{ke_chen_lin_wang_zhou_yin_lee_long_2019, title={Smart Windows: Electro-, Thermo-, Mechano-, Photochromics, and Beyond}, volume={9}, ISSN={["1614-6840"]}, DOI={10.1002/aenm.201902066}, abstractNote={Abstract}, number={39}, journal={ADVANCED ENERGY MATERIALS}, author={Ke, Yujie and Chen, Jingwei and Lin, Caojian and Wang, Shancheng and Zhou, Yang and Yin, Jie and Lee, Pool See and Long, Yi}, year={2019}, month={Oct} }
 @article{ke_chen_lin_wang_zhou_yin_lee_long_2019, title={Smart Windows: Smart Windows: Electro‐, Thermo‐, Mechano‐, Photochromics, and Beyond (Adv. Energy Mater. 39/2019)}, volume={9}, ISSN={1614-6832 1614-6840}, url={http://dx.doi.org/10.1002/aenm.201970153}, DOI={10.1002/aenm.201970153}, abstractNote={Advanced Energy MaterialsVolume 9, Issue 39 1970153 Back CoverFree Access Smart Windows: Smart Windows: Electro-, Thermo-, Mechano-, Photochromics, and Beyond (Adv. Energy Mater. 39/2019) Yujie Ke, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798 SingaporeSearch for more papers by this authorJingwei Chen, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798 SingaporeSearch for more papers by this authorGaojian Lin, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing, 100081 ChinaSearch for more papers by this authorShancheng Wang, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798 SingaporeSearch for more papers by this authorYang Zhou, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798 SingaporeSearch for more papers by this authorJie Yin, Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC, 27695 USASearch for more papers by this authorPooi See Lee, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798 Singapore Singapore-HUJ Alliance for Research and Enterprise (SHARE), Nanomaterials for Energy and Energy Water Nexus (NEW), Campus for Research Excellence and Technological Enterprise (CREATE), 1 Create Way, Singapore, 138602 SingaporeSearch for more papers by this authorYi Long, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798 Singapore Singapore-HUJ Alliance for Research and Enterprise (SHARE), Nanomaterials for Energy and Energy Water Nexus (NEW), Campus for Research Excellence and Technological Enterprise (CREATE), 1 Create Way, Singapore, 138602 Singapore Sino-Singapore International Joint Research Institute (SSIJRI), Guangzhou, 510000 ChinaSearch for more papers by this author Yujie Ke, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798 SingaporeSearch for more papers by this authorJingwei Chen, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798 SingaporeSearch for more papers by this authorGaojian Lin, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing, 100081 ChinaSearch for more papers by this authorShancheng Wang, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798 SingaporeSearch for more papers by this authorYang Zhou, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798 SingaporeSearch for more papers by this authorJie Yin, Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC, 27695 USASearch for more papers by this authorPooi See Lee, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798 Singapore Singapore-HUJ Alliance for Research and Enterprise (SHARE), Nanomaterials for Energy and Energy Water Nexus (NEW), Campus for Research Excellence and Technological Enterprise (CREATE), 1 Create Way, Singapore, 138602 SingaporeSearch for more papers by this authorYi Long, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798 Singapore Singapore-HUJ Alliance for Research and Enterprise (SHARE), Nanomaterials for Energy and Energy Water Nexus (NEW), Campus for Research Excellence and Technological Enterprise (CREATE), 1 Create Way, Singapore, 138602 Singapore Sino-Singapore International Joint Research Institute (SSIJRI), Guangzhou, 510000 ChinaSearch for more papers by this author First published: 17 October 2019 https://doi.org/10.1002/aenm.201970153Citations: 2AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinked InRedditWechat Abstract "What will be the next-generation window?" is the question addressed in article number 1902066 by Jie Yin, Pooi See Lee, Yi Long, and co-workers. The most recent progress in smart windows based on electro-, thermo-, mechano-, and photo-chromics is summarized. Developments in integrated devices toward multifunctionality are reviewed and a perspective on the future of smart windows is given. Citing Literature Volume9, Issue39October 17, 20191970153 RelatedInformation}, number={39}, journal={Advanced Energy Materials}, publisher={Wiley}, author={Ke, Yujie and Chen, Jingwei and Lin, Gaojian and Wang, Shancheng and Zhou, Yang and Yin, Jie and Lee, Pooi See and Long, Yi}, year={2019}, month={Oct}, pages={1970153} }
 @article{chabi_dikin_yin_percec_ren_2019, title={Structure-mechanical property relations of skin-core regions of poly(p-phenylene terephthalamide) single fiber}, volume={9}, DOI={10.1038/s41598-018-37366-0}, abstractNote={Abstract}, journal={Scientific Reports}, author={Chabi, S. and Dikin, D. and Yin, J. and Percec, S. and Ren, F.}, year={2019}, pages={740} }
 @article{lin_zhang_dikin_yin_2018, title={Constrained droplet base in condensed water on carbon nanoparticle coating for delayed freezing}, volume={24}, ISSN={2352-4316}, url={http://dx.doi.org/10.1016/j.eml.2018.09.001}, DOI={10.1016/j.eml.2018.09.001}, abstractNote={We studied the freezing of condensed water on carbon nanoparticles coated surfaces under high humidity. The coating is composed of assembled carbon nanoparticles with diameter of 20–30 nm and fabricated through a simple flame synthesis process followed by transfer-printing on polydimethylsiloxane (PDMS) substrates. Through in-situ observation of water condensation using environmental scanning electron microscopy (ESEM), we found that the water nucleation initiated from the underlying PDMS substrate rather than the coating due to the larger free energy barrier induced lower nucleation rate of nanoparticles. Unlike the growth of condensed micro-droplets with constant contact angle on bare PDMS surfaces, the condensed micro-drops on the coating were observed to grow with a constant base area. We showed that the small yet constant solid–liquid contact area during growth resulted in a low heat transfer rate between the condensed water droplets and the substrate, and thus an over twice longer freezing time of condensed water on coated PDMS surfaces than that on uncoated ones. Such a prolonged freezing performance is found to be comparable to that on superhydrophobic surfaces utilizing insulating air pockets to reduce the heat transfer rate, suggesting a complimentary strategy for design of anti-icing materials working under high humidity.}, journal={Extreme Mechanics Letters}, publisher={Elsevier BV}, author={Lin, Gaojian and Zhang, Qiuting and Dikin, Dmitriy A. and Yin, Jie}, year={2018}, month={Oct}, pages={38–46} }
 @article{tang_yin_2018, title={Design of Multifunctional Soft Doming Actuator for Soft Machines}, volume={3}, ISSN={2365-709X}, url={http://dx.doi.org/10.1002/admt.201800069}, DOI={10.1002/admt.201800069}, abstractNote={Abstract}, number={7}, journal={Advanced Materials Technologies}, publisher={Wiley}, author={Tang, Yichao and Yin, Jie}, year={2018}, month={May}, pages={1800069} }
 @article{yi_yin_tang_2018, title={Developing an advanced daylight model for building energy tool to simulate dynamic shading device}, volume={163}, ISSN={0038-092X}, url={http://dx.doi.org/10.1016/j.solener.2018.01.082}, DOI={10.1016/j.solener.2018.01.082}, abstractNote={Recent developments in materials engineering create a possibility of new building envelope systems to increase various aspects of building performance. One of the recent developments is a dynamically responsive material that changes its phase based on ambient environmental conditions. This is a major development in materials engineering, and exemplifies a material that responds to ambient temperature and changes its shape. This is a good candidate as a shading device that changes its location to block or allow sunlight during the daytime, to increase visible and thermal comfort of indoor spaces. Current building simulation tools are limited in testing new materials. The major hurdle is that existing building simulation tools are developed for conventional materials and have difficulties in modeling new dynamically responsive materials. This paper presents a method to capture the complexity of physical behaviors in new material through building energy simulations. A more efficient simulation tool to test new materials will allow for more reliable results and the advancement in innovative building materials. This paper develops a method to evaluate a new daylight control system that includes an analysis of a new dynamically tunable material. To assess the daylight control system composed with the new material, the paper integrates a daylight model, a whole-building energy model, and a Kriging model to evaluate the new system’s performance.}, journal={Solar Energy}, publisher={Elsevier BV}, author={Yi, Yun Kyu and Yin, Jie and Tang, Yichao}, year={2018}, month={Mar}, pages={140–149} }
 @article{zhang_lin_yin_2018, title={Highly efficient fog harvesting on superhydrophobic microfibers through droplet oscillation and sweeping}, volume={14}, ISSN={1744-683X 1744-6848}, url={http://dx.doi.org/10.1039/c8sm01688g}, DOI={10.1039/c8sm01688g}, abstractNote={Oscillating mobile droplets facilitate high-efficient fog harvesting on superhydrophobic microfibers.}, number={41}, journal={Soft Matter}, publisher={Royal Society of Chemistry (RSC)}, author={Zhang, Qiuting and Lin, Gaojian and Yin, Jie}, year={2018}, pages={8276–8283} }
 @article{guan_zhang_tang_yin_ren_2018, title={Kirigami-Inspired Nanoconfined Polymer Conducting Nanosheets with 2000% Stretchability}, volume={30}, ISSN={0935-9648}, url={http://dx.doi.org/10.1002/adma.201706390}, DOI={10.1002/adma.201706390}, abstractNote={Abstract}, number={20}, journal={Advanced Materials}, publisher={Wiley}, author={Guan, Ying-Shi and Zhang, Zhuolei and Tang, Yichao and Yin, Jie and Ren, Shenqiang}, year={2018}, month={Mar}, pages={1706390} }
 @article{lin_zhang_lv_tang_yin_2018, title={Small degree of anisotropic wetting on self-similar hierarchical wrinkled surfaces}, volume={14}, ISSN={1744-683X 1744-6848}, url={http://dx.doi.org/10.1039/c7sm02208e}, DOI={10.1039/c7sm02208e}, abstractNote={We studied the wetting behavior of multiscale self-similar hierarchical wrinkled surfaces.}, number={9}, journal={Soft Matter}, publisher={Royal Society of Chemistry (RSC)}, author={Lin, Gaojian and Zhang, Qiuting and Lv, Cunjing and Tang, Yichao and Yin, Jie}, year={2018}, pages={1517–1529} }
 @article{zhang_yin_2018, title={Spontaneous buckling-driven periodic delamination of thin films on soft substrates under large compression}, volume={118}, ISSN={0022-5096}, url={http://dx.doi.org/10.1016/j.jmps.2018.05.009}, DOI={10.1016/j.jmps.2018.05.009}, abstractNote={Through a combination of experiments, theoretical modeling, and finite element simulation, we explore the mechanics governing the formation and evolution of periodic buckle-delamination on both micro- and macro-scale by bonding a thin film to an extremely pre-strained soft elastomeric substrate over 400%. We find that upon the large substrate pre-strain release, the deformation in the film follows a three-stage deformation regime, i.e. onset of localized blisters (Stage I), growth through delamination crack propagation to form periodic sinusoidal blisters (Stage II), and transition to post-buckled jig-saw-like blisters under fixed-end compression after crack arrest (Stage III). Related energy-based mechanics models on predicting the evolution and geometry of periodic blisters under moderate and large compression are developed and validated through both experiments and finite element simulation. Finally, we discuss the potential applications of harnessing spontaneous buckle-delamination for interfacial toughness measurement through the metrology of blisters, as well as design of extremely stretchable electronics by achieving an extremely lower value of maximum tensile strain in the buckle-delaminated film.}, journal={Journal of the Mechanics and Physics of Solids}, publisher={Elsevier BV}, author={Zhang, Qiuting and Yin, Jie}, year={2018}, month={Sep}, pages={40–57} }
 @article{tang_zhang_lin_yin_2018, title={Switchable Adhesion Actuator for Amphibious Climbing Soft Robot}, volume={5}, ISSN={2169-5172 2169-5180}, url={http://dx.doi.org/10.1089/soro.2017.0133}, DOI={10.1089/soro.2017.0133}, abstractNote={Climbing soft robots are of tremendous interest in both science and engineering due to their potential applications in intelligent surveillance, inspection, maintenance, and detection under environments away from the ground. The challenge lies in the design of a fast, robust, switchable adhesion actuator to easily attach and detach the vertical surfaces. Here, we propose a new design of pneumatic-actuated bioinspired soft adhesion actuator working both on ground and under water. It is composed of extremely soft bilayer structures with an embedded spiral pneumatic channel resting on top of a base layer with a cavity. Rather than the traditional way of directly pumping air out of the cavity for suction in hard polymer-based adhesion actuator, we inflate air into the top spiral channel to deform into a stable 3D dome shape for achieving negative pressure in the cavity. The characterization of the maximum shear adhesion force of the proposed soft adhesion actuator shows strong and rapid reversible adhesion on multiple types of smooth and semi-smooth surfaces. Based on the switchable adhesion actuator, we design and fabricate a novel load-carrying amphibious climbing soft robot (ACSR) by combining with a soft bending actuator. We demonstrate that it can operate on a wide range of foreign horizontal and vertical surfaces including dry, wet, slippery, smooth, and semi-smooth ones on ground and also under water with certain load-carrying capability. We show that the vertical climbing speed can reach about 286 mm/min (1.6 body length/min) while carrying over 200 g object (over 5 times the weight of ACSR itself) during climbing on ground and under water. This research could largely push the boundaries of soft robot capabilities and multifunctionality in window cleaning and underwater inspection under harsh environment.}, number={5}, journal={Soft Robotics}, publisher={Mary Ann Liebert Inc}, author={Tang, Yichao and Zhang, Qiuting and Lin, Gaojian and Yin, Jie}, year={2018}, month={Oct}, pages={592–600} }
 @article{lin_ge_tang_xia_wu_han_yang_yin_2017, title={Cuts Guided Deterministic Buckling in Arrays of Soft Parallel Plates for Multifunctionality}, volume={9}, ISSN={1944-8244 1944-8252}, url={http://dx.doi.org/10.1021/acsami.7b09466}, DOI={10.1021/acsami.7b09466}, abstractNote={Harnessing buckling instability in soft materials offers an effective strategy to achieve multifunctionality. Despite great efforts in controlling the wrinkling behaviors of film-based systems and buckling of periodic structures, the benefits of classical plate buckling in soft materials remain largely unexplored. The challenge lies in the intrinsic indeterminate characteristics of buckling, leading to geometric frustration and random orientations. Here, we report the controllable global order in constrained buckling of arrays of parallel plates made of hydrogels and elastomers on rigid substrates. By introducing patterned cuts on the plates, the randomly phase-shifted buckling in the array of parallel plates transits to a prescribed and ordered buckling with controllable phases. The design principle for cut-directed deterministic buckling in plates is validated by both mechanics model and finite element simulation. By controlling the contacts and interactions between the buckled parallel plates, we demonstrate on-demand reconfigurable electrical and optical pathways, and the potential application in design of mechanical logic gates. By varying the local stimulus within the plates, we demonstrate that microscopic pathways can be written, visualized, erased, and rewritten macroscopically into a completely new one for potential applications such as soft reconfigurable circuits and logic devices.}, number={34}, journal={ACS Applied Materials & Interfaces}, publisher={American Chemical Society (ACS)}, author={Lin, Gaojian and Ge, Dengteng and Tang, Yichao and Xia, Yu and Wu, Gaoxiang and Han, Lin and Yang, Shu and Yin, Jie}, year={2017}, month={Aug}, pages={29345–29354} }
 @article{tang_yin_2017, title={Design of cut unit geometry in hierarchical kirigami-based auxetic metamaterials for high stretchability and compressibility}, volume={12}, ISSN={2352-4316}, url={http://dx.doi.org/10.1016/j.eml.2016.07.005}, DOI={10.1016/j.eml.2016.07.005}, abstractNote={We studied the mechanical response of a recently developed new class of mechanical metamaterials based on the paper art of cutting, kirigami. Specially, the geometrical and structural design of representative cut units, via combined line cut, cut-out, and hierarchy of the structure, was explored for achieving both extreme stretchability and/or compressibility in kirigami metamaterials through experiments, alongside geometrical modeling and finite element simulations. The kirigami design was tested on constituent materials including non-stretchable copy papers and highly stretchable silicone rubber to explore the role of constituent material properties. The cut unit in the shape of solid rectangles with the square shape as a special case was demonstrated for achieving the extreme stretchability via rigid rotation of cut units. We found that compared to the square cut units, the theoretically predicted maximum stretchability via unit rotation in rectangle units (aspect ratio 2:1) increased dramatically from about 41% to 124% for the level 1 cut structure without hierarchy, and from about 62% to 156% for the level 2 hierarchical cut structure, which was validated by both experiments and simulations. To demonstrate the achievement of both extreme stretchability and compressibility, we replaced the solid square cut units with porous squares and re-entrant lattice shapes in silicone rubber based metamaterials. We found that a porous structure can enable an extreme compressibility of as high as 81%.}, journal={Extreme Mechanics Letters}, publisher={Elsevier BV}, author={Tang, Yichao and Yin, Jie}, year={2017}, month={Apr}, pages={77–85} }
 @article{han_ma_vergara_palmese_yin_lee_han_2017, title={Non-additive impacts of covalent cross-linking on the viscoelastic nanomechanics of ionic polyelectrolyte complexes}, volume={7}, ISSN={2046-2069}, url={http://dx.doi.org/10.1039/c7ra08514a}, DOI={10.1039/c7ra08514a}, abstractNote={This study elucidates the influences of adding covalent cross-linking on the nanomechanical viscoelasticity of ionically cross-linked polyelectrolyte networks.}, number={84}, journal={RSC Advances}, publisher={Royal Society of Chemistry (RSC)}, author={Han, Biao and Ma, Tianzhu and Vergara, John H. and Palmese, Giuseppe R. and Yin, Jie and Lee, Daeyeon and Han, Lin}, year={2017}, pages={53334–53345} }
 @article{zhang_wommer_o’rourke_teitelman_tang_robison_lin_yin_2017, title={Origami and kirigami inspired self-folding for programming three-dimensional shape shifting of polymer sheets with light}, volume={11}, ISSN={2352-4316}, url={http://dx.doi.org/10.1016/j.eml.2016.08.004}, DOI={10.1016/j.eml.2016.08.004}, abstractNote={Origami and kirigami guided programmable shape shifting is explored via self-folding and spontaneous buckling of a thin sheet of shape memory polymer with light. By patterning the sheet with printed black ink lines as actuating hinges, we show that the folding angle can be well controlled by tuning the ink line width, which is predicted by both a simplified localized bilayer folding model and corresponding finite element method (FEM) simulation. Inspired by the approach of paper origami and kirigami combining folding and cutting, we then explored the design of prescribed patterned creases (i.e. ink lines) and/or cuts in the polymer thin sheet for programming a library of light-responsive three-dimensional (3-D) surfaces in a controlled fashion. Through the design of prescribed straight and curved crease patterns in origami, we demonstrated the generation of light-driven self-folding cylinders, helices, and pyramids with zero Gaussian curvature, as well as spontaneous formation of saddles with negative Gaussian curvature through localized curved folding induced global buckling. The quantitative underlying mechanism governing the geometry of the different self-folded 3-D structures is revealed through simple geometrical modeling and FEM simulations. Lastly, through kirigami combining both folding and cutting in the form of line cuts or cut-outs, we demonstrated the spontaneous formation of light-responsive, more complex pop-up kirigami structures.}, journal={Extreme Mechanics Letters}, publisher={Elsevier BV}, author={Zhang, Qiuting and Wommer, Jonathon and O’Rourke, Connor and Teitelman, Joseph and Tang, Yichao and Robison, Joshua and Lin, Gaojian and Yin, Jie}, year={2017}, month={Feb}, pages={111–120} }
 @article{lin_chandrasekaran_lv_zhang_tang_han_yin_2017, title={Self-similar Hierarchical Wrinkles as a Potential Multifunctional Smart Window with Simultaneously Tunable Transparency, Structural Color, and Droplet Transport}, volume={9}, ISSN={1944-8244 1944-8252}, url={http://dx.doi.org/10.1021/acsami.7b05056}, DOI={10.1021/acsami.7b05056}, abstractNote={Smart window has immense potential for energy savings in architectural and vehicular applications, while most studies focus on the tunability of a single property of optical transmittance. Here we explore harnessing dynamically tunable hierarchical wrinkles for design of a potential multifunctional smart window with combined structural color and water droplet transport control. The self-similar hierarchical wrinkles with both nanoscale and microscale features are generated on a prestrained poly(dimethylsiloxane) elastomer through sequential strain release and multistep oxygen plasma treatment. We show that the hierarchically wrinkled elastomer displays both opaqueness and iridescent structural color. We find that restretching/releasing the elastomer leads to the reversible and repeatable switch from opaqueness to transparency, arising from the flattening of large wrinkles (micrometer scale), while a nonvanishing structural color occurs due to the nondisappearing small wrinkles (nanoscale). The unique features of combined reversible large wrinkles and irreversible small wrinkles during hierarchical wrinkling are well reproduced by corresponding finite element simulation. The criteria for generating self-similar hierarchical wrinkles is revealed through a simplified theoretical model and validated by experiments. In addition to its tunable optical property, we further show its ability in control of water droplet transport on demand through mechanical stretching and release. We find that an initially pinned water droplet on the tilted hierarchically wrinkled surface starts to slide when the surface is stretched, and becomes pinned again upon strain release. Such a process is reversible and repeatable. The hierarchically wrinkled surface could find broad potential applications not only in multifunctional smart windows with additional features of aesthetics and water collection, but in microfluidics, design of slippery surfaces, and directional water transportation.}, number={31}, journal={ACS Applied Materials & Interfaces}, publisher={American Chemical Society (ACS)}, author={Lin, Gaojian and Chandrasekaran, Prashant and Lv, Cunjing and Zhang, Qiuting and Tang, Yichao and Han, Lin and Yin, Jie}, year={2017}, month={Jul}, pages={26510–26517} }
 @article{zhang_tang_hajfathalian_chen_turner_dikin_lin_yin_2017, title={Spontaneous Periodic Delamination of Thin Films To Form Crack-Free Metal and Silicon Ribbons with High Stretchability}, volume={9}, ISSN={1944-8244 1944-8252}, url={http://dx.doi.org/10.1021/acsami.7b15693}, DOI={10.1021/acsami.7b15693}, abstractNote={Design of electronic materials with high stretchability is of great importance for realizing soft and conformal electronics. One strategy of realizing stretchable metals and semiconductors is to exploit the buckling of materials bonded to elastomers. However, the level of stretchability is often limited by the cracking and fragmentation of the materials that occurs when constrained buckling occurs while bonded to the substrate. Here, we exploit a failure mechanism, spontaneous buckling-driven periodic delamination, to achieve high stretchability in metal and silicon films that are deposited on prestrained elastomer substrates. We find that both globally periodic buckle-delaminated pattern and ordered cracking patterns over large areas are observed in the spontaneously buckle-delaminated thin films. The geometry of periodic delaminated buckles and cracking periodicity can be predicted by theoretical models. By patterning the films into ribbons with widths smaller than the predicted cracking periodicity, we demonstrate the design of crack-free and spontaneous delaminated ribbons on highly prestrained elastomer substrates, which provides a high stretchability of about 120% and 400% in Si and Au ribbons, respectively. We find that the high stretchability is mainly attributed to the largely relaxed strain in the ribbons via spontaneous buckling-driven delamination, as made evident by the small maximum tensile strain in both ribbons, which is measured to be over 100 times smaller than that of the substrate prestrain.}, number={51}, journal={ACS Applied Materials & Interfaces}, publisher={American Chemical Society (ACS)}, author={Zhang, Qiuting and Tang, Yichao and Hajfathalian, Maryam and Chen, Chunxu and Turner, Kevin T. and Dikin, Dmitriy A. and Lin, Gaojian and Yin, Jie}, year={2017}, month={Dec}, pages={44938–44947} }
 @article{han_chery_yin_lu_lee_han_2016, title={Nanomechanics of layer-by-layer polyelectrolyte complexes: a manifestation of ionic cross-links and fixed charges}, volume={12}, ISSN={1744-683X 1744-6848}, url={http://dx.doi.org/10.1039/c5sm01430a}, DOI={10.1039/c5sm01430a}, abstractNote={This study investigates the roles of two distinct features of ionically cross-linked polyelectrolyte networks – ionic cross-links and fixed charges – in determining their nanomechanical properties.}, number={4}, journal={Soft Matter}, publisher={Royal Society of Chemistry (RSC)}, author={Han, Biao and Chery, Daphney R. and Yin, Jie and Lu, X. Lucas and Lee, Daeyeon and Han, Lin}, year={2016}, pages={1158–1169} }
 @article{tang_lin_yang_yi_kamien_yin_2016, title={Programmable Kiri-Kirigami Metamaterials}, volume={29}, ISSN={0935-9648}, url={http://dx.doi.org/10.1002/adma.201604262}, DOI={10.1002/adma.201604262}, abstractNote={Programmable kirigami metamaterials with controllable local tilting orientations on demand through prescribed notches are constructed through a new approach of kiri-kirgami, and their actuation of pore opening via both mechanical stretching and temperature, along with their potential application as skins for energy-saving buildings, is discussed.}, number={10}, journal={Advanced Materials}, publisher={Wiley}, author={Tang, Yichao and Lin, Gaojian and Yang, Shu and Yi, Yun Kyu and Kamien, Randall D. and Yin, Jie}, year={2016}, month={Dec}, pages={1604262} }
 @article{thomas_andow_suresh_eksik_yin_dyson_koratkar_2015, title={Controlled Crumpling of Graphene Oxide Films for Tunable Optical Transmittance}, volume={27}, ISSN={0935-9648}, url={http://dx.doi.org/10.1002/adma.201405821}, DOI={10.1002/adma.201405821}, abstractNote={The delamination buckling approach provides a facile means to dynamically control the optical transmittance of extremely flexible and stretchable graphene oxide coatings with fast response time. Such graphene oxide coatings can be deposited by scalable solution-processing methods for potential applications in dynamic glazing.}, number={21}, journal={Advanced Materials}, publisher={Wiley}, author={Thomas, Abhay V. and Andow, Brandon C. and Suresh, Shravan and Eksik, Osman and Yin, Jie and Dyson, Anna H. and Koratkar, Nikhil}, year={2015}, month={Apr}, pages={3256–3265} }
 @article{tang_lin_han_qiu_yang_yin_2015, title={Design of Hierarchically Cut Hinges for Highly Stretchable and Reconfigurable Metamaterials with Enhanced Strength}, volume={27}, ISSN={0935-9648}, url={http://dx.doi.org/10.1002/adma.201502559}, DOI={10.1002/adma.201502559}, abstractNote={Applying hierarchical cuts to thin sheets of elastomer generates super-stretchable and reconfigurable metamaterials, exhibiting highly nonlinear stress-strain behaviors and tunable phononic bandgaps. The cut concept fails on brittle thin sheets due to severe stress concentration in the rotating hinges. By engineering the local hinge shapes and global hierarchical structure, cut-based reconfigurable metamaterials with largely enhanced strength are realized.}, number={44}, journal={Advanced Materials}, publisher={Wiley}, author={Tang, Yichao and Lin, Gaojian and Han, Lin and Qiu, Songgang and Yang, Shu and Yin, Jie}, year={2015}, month={Oct}, pages={7181–7190} }
 @article{cho_lee_ellerthorpe_feng_lin_wu_yin_yang_2015, title={Elastoplastic Inverse Opals as Power-Free Mechanochromic Sensors for Force Recording}, volume={25}, ISSN={1616-301X}, url={http://dx.doi.org/10.1002/adfm.201502774}, DOI={10.1002/adfm.201502774}, abstractNote={Light‐weight, power‐free mechanochromic sensors that can change and record the reflective color depending on the magnitude and rate of the applied force are fabricated from inverse opals by infiltrating the colloidal crystals of silica particles with uncrosslinked SU‐8, followed by removal of the colloidal templates. The mechanical sensing range of the materials is high, 17.6–20.4 MPa. Due to elastoplastic deformation of the SU‐8 films, the deformed structures and thus colors can be locked after the removal of the load, therefore establishing a quantitative relationship between the mechanical force and optical responses. In comparison, mechanochromic photonic gels reported in the literature typically detect force in the range of 10–100 kPa; once the load is removed, the structure and color return back to the original ones. The mechanochromic sensors are highly sensitive: the ratio of shift in the stopband wavelength to the change in applied strain is up to 5.7 nm per percent, the highest among literature. Comparison of finite element simulations with experiments confirms the elastoplastic deformation of the films and highlights that reconfiguration of pore shape under compression plays a key role in the mechanochromic response.}, number={38}, journal={Advanced Functional Materials}, publisher={Wiley}, author={Cho, Younghyun and Lee, Su Yeon and Ellerthorpe, Lindsay and Feng, Gang and Lin, Gaojian and Wu, Gaoxiang and Yin, Jie and Yang, Shu}, year={2015}, month={Aug}, pages={6041–6049} }
 @article{yin_boyce_2015, title={Unique wrinkles as identity tags}, volume={520}, ISSN={0028-0836 1476-4687}, url={http://dx.doi.org/10.1038/nature14380}, DOI={10.1038/nature14380}, abstractNote={Spontaneously generated, random wrinkles of coatings on microscale particles have been found to be analogous to fingerprints — unique patterns with a wavy topography that can serve as unclonable tags for anti-counterfeiting purposes.}, number={7546}, journal={Nature}, publisher={Springer Science and Business Media LLC}, author={Yin, Jie and Boyce, Mary C.}, year={2015}, month={Apr}, pages={164–165} }
 @article{yin_yagüe_boyce_gleason_2014, title={Biaxially Mechanical Tuning of 2-D Reversible and Irreversible Surface Topologies through Simultaneous and Sequential Wrinkling}, volume={6}, ISSN={1944-8244 1944-8252}, url={http://dx.doi.org/10.1021/am4054207}, DOI={10.1021/am4054207}, abstractNote={Controlled buckling is a facile means of structuring surfaces. The resulting ordered wrinkling topologies provide surface properties and features desired for multifunctional applications. Here, we study the biaxially dynamic tuning of two-dimensional wrinkled micropatterns under cyclic mechanical stretching/releasing/restretching simultaneously or sequentially. A biaxially prestretched PDMS substrate is coated with a stiff polymer deposited by initiated chemical vapor deposition (iCVD). Applying a mechanical release/restretch cycle in two directions loaded simultaneously or sequentially to the wrinkled system results in a variety of dynamic and tunable wrinkled geometries, the evolution of which is investigated using in situ optical profilometry, numerical simulations, and theoretical modeling. Results show that restretching ordered herringbone micropatterns, created through sequential release of biaxial prestrain, leads to reversible and repeatable surface topography. The initial flat surface and the same wrinkled herringbone pattern are obtained alternatively after cyclic release/restretch processes, owing to the highly ordered structure leaving no avenue for trapping irregular topological regions during cycling as further evidenced by the uniformity of strains distributions and negligible residual strain. Conversely, restretching disordered labyrinth micropatterns created through simultaneous release shows an irreversible surface topology whether after sequential or simultaneous restretching due to creation of irregular surface topologies with regions of highly concentrated strain upon formation of the labyrinth which then lead to residual strains and trapped topologies upon cycling; furthermore, these trapped topologies depend upon the subsequent strain histories as well as the cycle. The disordered labyrinth pattern varies after each cyclic release/restretch process, presenting residual shallow patterns instead of achieving a flat state. The ability to dynamically tune the highly ordered herringbone patterning through mechanical stretching or other actuation makes these wrinkles excellent candidates for tunable multifunctional surfaces properties such as reflectivity, friction, anisotropic liquid flow or boundary layer control.}, number={4}, journal={ACS Applied Materials & Interfaces}, publisher={American Chemical Society (ACS)}, author={Yin, Jie and Yagüe, Jose Luis and Boyce, Mary C. and Gleason, Karen K.}, year={2014}, month={Feb}, pages={2850–2857} }
 @article{yagüe_yin_boyce_gleason_2013, title={Design of Ordered Wrinkled Patterns with Dynamically Tuned Properties}, volume={46}, ISSN={1875-3892}, url={http://dx.doi.org/10.1016/j.phpro.2013.07.043}, DOI={10.1016/j.phpro.2013.07.043}, abstractNote={The formation of patterned surfaces is a common tool to engineer materials. The capability to design and reproduce detailed features is a key factor to fulfill requirements for functional surfaces. Generation of wrinkles via buckling of a stiff film on a compliant surface is an inexpensive, easy and reliable method to yield a patterned surface. The wrinkling method has been exploited in a wide variety of areas, including photovoltaics, microfluidics, adhesion, and anti-fouling systems. Here we show the ability to obtain deterministically ordered herringbone patterns. In a biaxially pre-stretched PDMS sample a thin film of a stiff coating is deposited by initiated chemical vapor deposition (iCVD). iCVD is a solvent- free technique that yields a conformal thin coating on virtually any substrate, giving a controllable thickness and tunable structural, mechanical, thermal, wetting, and swelling properties. Sequential release of the film-substrate system shows the transition from 1-D ripples to an ordered herringbone pattern. Wrinkle features can be controlled adjusting the film thickness, the initial load and the release process. Moreover, the surface topography can be dynamically tuned by applying a controlled mechanical stimulus. These properties make these materials excellent candidates for flexible applications.}, journal={Physics Procedia}, publisher={Elsevier BV}, author={Yagüe, Jose Luis and Yin, Jie and Boyce, Mary C. and Gleason, Karen K.}, year={2013}, pages={40–45} }
 @article{yin_retsch_thomas_boyce_2012, title={Collective Mechanical Behavior of Multilayer Colloidal Arrays of Hollow Nanoparticles}, volume={28}, ISSN={0743-7463 1520-5827}, url={http://dx.doi.org/10.1021/la300039v}, DOI={10.1021/la300039v}, abstractNote={The collective mechanical behavior of multilayer colloidal arrays of hollow silica nanoparticles (HSNP) is explored under spherical nanoindentation through a combination of experimental, numerical, and theoretical approaches. The effective indentation modulus E(ind) is found to decrease with an increasing number of layers in a nonlinear manner. The indentation force versus penetration depth behavior for multilayer hollow particle arrays is predicted by an approximate analytical model based on the spring stiffness of the individual particles and the multipoint, multiparticle interactions as well as force transmission between the layers. The model is in good agreement with experiments and with detailed finite element simulations. The ability to tune the effective indentation modulus, E(ind), of the multilayer arrays by manipulating particle geometry and layering is revealed through the model, where E(ind) = (0.725m(-3/2) + 0.275)E(mon) and E(mon) is the monolayer modulus and m is number of layers. E(ind) is seen to plateau with increasing m to E(ind_plateau) = 0.275E(mon) and E(mon) scales with (t/R)(2), t being the particle shell thickness and R being the particle radius. The scaling law governing the nonlinear decrease in indentation modulus with an increase in layer number (E(ind) scaling with m(-3/2)) is found to be similar to that governing the indentation modulus of thin solid films E(ind_solid) on a stiff substrate (where E(ind_solid) scales with h(-1.4) and also decreases until reaching a plateau value) which also decreases with an increase in film thickness h. However, the mechanisms underlying this trend for the colloidal array are clearly different, where discrete particle-to-particle interactions govern the colloidal array behavior in contrast to the substrate constraint on deformation, which governs the thickness dependence of the continuous thin film indentation modulus.}, number={13}, journal={Langmuir}, publisher={American Chemical Society (ACS)}, author={Yin, Jie and Retsch, Markus and Thomas, Edwin L. and Boyce, Mary C.}, year={2012}, month={Mar}, pages={5580–5588} }
 @article{yin_yagüe_eggenspieler_gleason_boyce_2012, title={Deterministic Order in Surface Micro-Topologies through Sequential Wrinkling}, volume={24}, ISSN={0935-9648}, url={http://dx.doi.org/10.1002/adma.201201937}, DOI={10.1002/adma.201201937}, abstractNote={Ordered herringbone patterns with deterministic long and short wavelengths are created using a sequential wrinkling strategy (SWS). Patterns with a prescribed zig-zag turning angle less than 90° are obtained upon sequential wrinkling of non-equi-biaxial prestrain for the first time. SWS provides a new method for measuring thin-film mechanical properties simply through the wrinkling metrology without measurement of film thickness.}, number={40}, journal={Advanced Materials}, publisher={Wiley}, author={Yin, Jie and Yagüe, Jose Luis and Eggenspieler, Damien and Gleason, Karen K. and Boyce, Mary C.}, year={2012}, month={Aug}, pages={5441–5446} }
 @inbook{chen_yin_2012, title={Mechanical Self-Assembly in Nature}, ISBN={9781461445616 9781461445623}, url={http://dx.doi.org/10.1007/978-1-4614-4562-3_1}, DOI={10.1007/978-1-4614-4562-3_1}, booktitle={Mechanical Self-Assembly}, publisher={Springer New York}, author={Chen, Xi and Yin, Jie}, year={2012}, month={Nov}, pages={1–8} }
 @inbook{chen_yin_2012, title={Mechanical Self-Assembly on Curved Substrates}, ISBN={9781461445616 9781461445623}, url={http://dx.doi.org/10.1007/978-1-4614-4562-3_9}, DOI={10.1007/978-1-4614-4562-3_9}, booktitle={Mechanical Self-Assembly}, publisher={Springer New York}, author={Chen, Xi and Yin, Jie}, year={2012}, month={Nov}, pages={171–199} }
 @inbook{chen_yin_2012, title={Mechanical Self-Assembly vs. Morphogenesis}, ISBN={9781461445616 9781461445623}, url={http://dx.doi.org/10.1007/978-1-4614-4562-3_2}, DOI={10.1007/978-1-4614-4562-3_2}, booktitle={Mechanical Self-Assembly}, publisher={Springer New York}, author={Chen, Xi and Yin, Jie}, year={2012}, month={Nov}, pages={9–23} }
 @article{han_yin_wang_chia_cohen_rubner_ortiz_boyce_2012, title={Tunable stimulus-responsive friction mechanisms of polyelectrolyte films and tube forests}, volume={8}, ISSN={1744-683X 1744-6848}, url={http://dx.doi.org/10.1039/c2sm25503k}, DOI={10.1039/c2sm25503k}, abstractNote={The pH-responsive frictional behavior of layer-by-layer assembled poly(allylamine hydrochloride) and poly(acrylic acid) multilayers is quantified in different geometric forms of a continuous planar film and anisotropic tube forests. A mechanistic change from surface adhesion dominated frictional behavior to visco/poroelasticity-governed shear occurs for the planar film upon pH-stimulus. This pH-dependent friction can be further controlled by the discrete anisotropic geometry of the tube forest, which introduces additional friction due to asymmetric deformation of the discrete bending of the tubes during lateral motion. This study provides important insights into the design of polyelectrolyte-based coatings with a wide range of controllable surface frictional properties, tuned via interactions between the inherent stimulus-responsive material behavior and the microgeometry of the anisotropic tube forest.}, number={33}, journal={Soft Matter}, publisher={Royal Society of Chemistry (RSC)}, author={Han, Lin and Yin, Jie and Wang, Lifeng and Chia, Khek-Khiang and Cohen, Robert E. and Rubner, Michael F. and Ortiz, Christine and Boyce, Mary C.}, year={2012}, pages={8642} }
 @article{yin_retsch_lee_thomas_boyce_2011, title={Mechanics of Nanoindentation on a Monolayer of Colloidal Hollow Nanoparticles}, volume={27}, ISSN={0743-7463 1520-5827}, url={http://dx.doi.org/10.1021/la2018117}, DOI={10.1021/la2018117}, abstractNote={We explore the collective mechanical behavior of monolayer assemblies composed of close-packed arrays of hollow silica nanoparticles using a spherical nanoindentor. Seven types of well-defined hollow nanoparticles are studied with their radii ranging from 100 to 300 nm and shell thickness ranging from 14 to 44 nm. Micromechanical models reveal the underlying deformation mechanisms during indentation, where the consecutive contacting of the indentor with an increasing number of nanoparticles results in a nonlinear increase in the indentation force with penetration depth. Each contacted hollow nanoparticle successively locally bends, flattens, and then locally buckles. The effective indentation modulus of the monolayer film, which is obtained by a Hertzian fit to the experimental data, is found to be proportional to the elastic modulus of the nanoparticle shell material and scales exponentially with the ratio of particle shell thickness t to radius R to the power of 2.3. Furthermore, we find that for a constant film density with the same (t)/(R) of the constituent nanoparticles, smaller particles with a thinner shell can provide a higher effective indentation modulus, compared to their larger diameter and thicker shell counterparts. This study provides useful insights and guidance for constructing high-performance lightweight nanoparticle films and coatings with potential applications in tailoring stiffness and mechanical energy absorption.}, number={17}, journal={Langmuir}, publisher={American Chemical Society (ACS)}, author={Yin, Jie and Retsch, Markus and Lee, Jae-Hwang and Thomas, Edwin L. and Boyce, Mary C.}, year={2011}, month={Sep}, pages={10492–10500} }
 @article{chen_yin_2010, title={Buckling patterns of thin films on curved compliant substrates with applications to morphogenesis and three-dimensional micro-fabrication}, volume={6}, ISSN={1744-683X 1744-6848}, url={http://dx.doi.org/10.1039/c0sm00401d}, DOI={10.1039/c0sm00401d}, abstractNote={Self-assembled buckling patterns of thin films on compliant substrates have been subjected to extensive studies and shown great promise in micro-fabrication. However, most previous studies were limited to planar substrates, and the study of buckling of films on curved substrates has not received sufficient attention. With the constraining effect from various types of substrate curvature, numerous new types of buckling morphologies may emerge which not only enable true three-dimensional (3D) fabrication of microstructures and microdevices, but also have important implications for the morphogenesis of quite a few natural and biological systems. We review the scientific aspects of elastic buckling of thin films on several representative curved substrates, emphasizing the critical effect of substrate curvature, its interaction with other material/system parameters, ways to control the buckles based on mechanical and physical principles, and bridge them with prospective applications in biology, biomedical engineering, and small-scale fabrication.}, number={22}, journal={Soft Matter}, publisher={Royal Society of Chemistry (RSC)}, author={Chen, Xi and Yin, Jie}, year={2010}, pages={5667} }
 @article{yin_gerling_chen_2010, title={Mechanical modeling of a wrinkled fingertip immersed in water}, volume={6}, ISSN={1742-7061}, url={http://dx.doi.org/10.1016/j.actbio.2009.10.025}, DOI={10.1016/j.actbio.2009.10.025}, abstractNote={Fingertips often wrinkle after extended exposure to water. The underlying mechanics issues, in particular the critical parameters governing the wrinkled morphology, are studied by using both finite element simulation and analytical modeling. The wrinkling behaviors, characterized by the wrinkle-to-wrinkle distance (wavelength), wrinkle depth (amplitude) and critical wrinkling stress/strain, are investigated as the geometry and material parameters of the fingertip are varied. A simple reduced model is employed to understand the effect of finger curvature and skin thickness, whereas a more refined full anatomical model provides the basis for analyzing the effect of a multilayered skin structure. The simulation results demonstrate that the stiffness of the stratum corneum and the dermal layer in the skin has a large effect on the wrinkling behavior, which agrees well with the analytical predictions. From the uncovered mechanical principles, potential ways for effectively slowing down and suppressing skin wrinkles are proposed; among them, increasing the modulus of the dermal layer in the skin appears to be the most effective.}, number={4}, journal={Acta Biomaterialia}, publisher={Elsevier BV}, author={Yin, Jie and Gerling, Gregory J. and Chen, Xi}, year={2010}, month={Apr}, pages={1487–1496} }
 @article{yin_chen_sheinman_2009, title={Anisotropic buckling patterns in spheroidal film/substrate systems and their implications in some natural and biological systems}, volume={57}, ISSN={0022-5096}, url={http://dx.doi.org/10.1016/j.jmps.2009.06.002}, DOI={10.1016/j.jmps.2009.06.002}, abstractNote={We establish a quantitative mechanics framework of elastic buckling of a spheroidal thin film/substrate system, which is highly relevant to the morphologies of quite a few natural and biological systems. The anisotropic stress-driven bifurcation is governed by the ratios between the effective size/thickness, the equatorial/polar radii, and the substrate/film moduli. The possibilities of manipulating the undulations through external constraints, anisotropic growth/material properties, and substrate geometry/structure are discussed. Analytical equations correlating the undulation characteristics with the geometry/material properties are derived. The quantitative mechanics framework established herein not only has important implications on the morphogenesis of various fruits, vegetables, nuts, eggs, tissues, and animal body parts, but also could guide the three-dimensional micro-fabrications via controlled self-assembly on curved substrate surfaces.}, number={9}, journal={Journal of the Mechanics and Physics of Solids}, publisher={Elsevier BV}, author={Yin, Jie and Chen, Xi and Sheinman, Izhak}, year={2009}, month={Sep}, pages={1470–1484} }
 @article{yin_bar-kochba_chen_2009, title={Mechanical self-assembly fabrication of gears}, volume={5}, ISSN={1744-683X 1744-6848}, url={http://dx.doi.org/10.1039/b904635f}, DOI={10.1039/b904635f}, abstractNote={Self-assembled buckling of thin film/substrate systems has attracted increasing attention for fabricating ordered micro- and nanostructures. However, most studies have been limited to a planar substrate. We employ the spontaneous buckling patterns on curved substrates to fabricate several types of quasi-two-dimensional (quasi-2D) and three-dimensional (3D) gear-like microcomponents. The substrate curvature can be positive or negative, and the proposed technique does not require extra external guidance or a prepatterned template. The gear features, including the number and amplitude of the teeth, can be manipulated by controlling the geometry and material properties of the film/substrate system. A theoretical model is established to predict the buckled profiles, which is validated by numerical simulation and experiment. A variety of gear morphologies, including 3D bevel and helical gears (which are difficult to fabricate using the conventional photolithography/etching technique), are obtained to further demonstrate the potential of the mechanical self-assembly approach.}, number={18}, journal={Soft Matter}, publisher={Royal Society of Chemistry (RSC)}, author={Yin, Jie and Bar-Kochba, Eyal and Chen, Xi}, year={2009}, pages={3469} }
 @article{yin_cao_li_sheinman_chen_2008, title={Stress-driven buckling patterns in spheroidal core/shell structures}, volume={105}, ISSN={0027-8424 1091-6490}, url={http://dx.doi.org/10.1073/pnas.0810443105}, DOI={10.1073/pnas.0810443105}, abstractNote={Many natural fruits and vegetables adopt an approximately spheroidal shape and are characterized by their distinct undulating topologies. We demonstrate that various global pattern features can be reproduced by anisotropic stress-driven buckles on spheroidal core/shell systems, which implies that the relevant mechanical forces might provide a template underpinning the topological conformation in some fruits and plants. Three dimensionless parameters, the ratio of effective size/thickness, the ratio of equatorial/polar radii, and the ratio of core/shell moduli, primarily govern the initiation and formation of the patterns. A distinct morphological feature occurs only when these parameters fall within certain ranges: In a prolate spheroid, reticular buckles take over longitudinal ridged patterns when one or more parameters become large. Our results demonstrate that some universal features of fruit/vegetable patterns (e.g., those observed in Korean melons, silk gourds, ribbed pumpkins, striped cavern tomatoes, and cantaloupes, etc.) may be related to the spontaneous buckling from mechanical perspectives, although the more complex biological or biochemical processes are involved at deep levels.}, number={49}, journal={Proceedings of the National Academy of Sciences}, publisher={Proceedings of the National Academy of Sciences}, author={Yin, J. and Cao, Z. and Li, C. and Sheinman, I. and Chen, X.}, year={2008}, month={Nov}, pages={19132–19135} }