@article{liu_sui_harbinson_pudlo_perera_zhang_liu_ku_islam_liu_et al._2023, title={A scalable microstructure photonic coating fabricated by roll-to-roll “defects” for daytime sub-ambient passive radiative cooling}, volume={23}, ISSN={["1530-6992"]}, url={https://doi.org/10.1021/acs.nanolett.3c00111}, DOI={10.1021/acs.nanolett.3c00111}, abstractNote={The deep space's coldness (∼4 K) provides a ubiquitous and inexhaustible thermodynamic resource to suppress the cooling energy consumption. However, it is nontrivial to achieve subambient radiative cooling during daytime under strong direct sunlight, which requires rational and delicate photonic design for simultaneous high solar reflectivity (>94%) and thermal emissivity. A great challenge arises when trying to meet such strict photonic microstructure requirements while maintaining manufacturing scalability. Herein, we demonstrate a rapid, low-cost, template-free roll-to-roll method to fabricate spike microstructured photonic nanocomposite coatings with Al2O3 and TiO2 nanoparticles embedded that possess 96.0% of solar reflectivity and 97.0% of thermal emissivity. When facing direct sunlight in the spring of Chicago (average 699 W/m2 solar intensity), the coatings show a radiative cooling power of 39.1 W/m2. Combined with the coatings' superhydrophobic and contamination resistance merits, the potential 14.4% cooling energy-saving capability is numerically demonstrated across the United States.}, number={17}, journal={Nano Letters}, author={Liu, S. and Sui, C. and Harbinson, M. and Pudlo, M. and Perera, Himendra and Zhang, Zhenzhen and Liu, Ruguan and Ku, Zahyun and Islam, Md Didarul and Liu, Yuxuan and et al.}, editor={Ryu, JongEditor}, year={2023}, pages={7767–7774} }
 @article{phillips_chen_islam_ryu_zikry_2023, title={Predicting and Controlling Ribbing Instabilities of Carbon Nanotube-PDMS Thin-Film Systems for Multifunctional Applications}, volume={7}, ISSN={["1527-2648"]}, url={https://doi.org/10.1002/adem.202300582}, DOI={10.1002/adem.202300582}, abstractNote={The manufacturing of thin films with structured surfaces by large‐scale rolling has distinct advantages over other techniques, such as lithography, due to scalability. However, it is not well understood or quantified how processing conditions can affect the microstructure at different physical scales. Hence, the objective of this investigation is to develop a validated computational model of the symmetric forward‐roll coating process to understand, predict, and control the morphology of carbon nanotube (CNT)–polydimethylsiloxane (PDMS) pastes. The effects of the thin‐film rheological properties and the roller gap on the ribbing behavior are investigated and a ribbing instability prediction model is formulated from experimental measurements and computational predictions. The CNT–PDMS thin‐film system is modeled by a nonlinear implicit dynamic finite‐element method that accounts for ribbing instabilities, large displacements, rolling contact, and material viscoelasticity. Dynamic mechanical analysis is used to obtain the viscoelastic properties of the CNT–PDMS paste for various CNT weight distributions. Furthermore, a Morris sensitivity analysis is conducted to obtain insights on the dominant predicted characteristics pertaining to the ribbing microstructure. Based on the sensitivity analysis, a critical ribbing aspect ratio is identified for the CNT–PDMS system corresponding to a critical roller gap.}, journal={ADVANCED ENGINEERING MATERIALS}, publisher={Wiley}, author={Phillips, Matthew and Chen, Muh-Jang and Islam, Md Didarul and Ryu, Jong and Zikry, Mohammed}, year={2023}, month={Jul} }
 @article{islam_liu_choi_guo_ryu_2022, title={Physics-based Computational Method Predicting the Dielectric Properties of Polymer Nanocomposites}, volume={4}, ISSN={["1573-4897"]}, url={http://dx.doi.org/10.1007/s10443-022-10026-3}, DOI={10.1007/s10443-022-10026-3}, number={4}, journal={APPLIED COMPOSITE MATERIALS}, publisher={Springer Science and Business Media LLC}, author={Islam, Md Didarul and Liu, Sipan and Choi, Daniel and Guo, Zhanhu and Ryu, Jong Eun}, year={2022}, month={Apr} }
 @article{islam_perera_black_phillips_chen_hodges_jackman_liu_kim_zikry_et al._2022, title={Template‐Free Scalable Fabrication of Linearly Periodic Microstructures by Controlling Ribbing Defects Phenomenon in Forward Roll Coating for Multifunctional Applications}, volume={9}, ISSN={2196-7350 2196-7350}, url={http://dx.doi.org/10.1002/admi.202201237}, DOI={10.1002/admi.202201237}, abstractNote={Abstract}, number={27}, journal={Advanced Materials Interfaces}, publisher={Wiley}, author={Islam, Md Didarul and Perera, Himendra and Black, Benjamin and Phillips, Matthew and Chen, Muh‐Jang and Hodges, Greyson and Jackman, Allyce and Liu, Yuxuan and Kim, Chang‐Jin and Zikry, Mohammed and et al.}, year={2022}, month={Aug}, pages={2201237} }
 @inproceedings{islam_liu_derov_urbas_ku_sihn_smith_boyd_kim_sanghera_et al._2021, title={Highly Efficient Mid-Wavelength Infrared (MWIR) Polarizer by ORMOCHALC Composite With Improved Thermomechanical Stability and Spectral Selectivity}, url={http://dx.doi.org/10.1115/imece2021-70843}, DOI={10.1115/imece2021-70843}, abstractNote={Abstract}, booktitle={Volume 3: Advanced Materials: Design, Processing, Characterization, and Applications}, publisher={American Society of Mechanical Engineers}, author={Islam, Md Didarul and Liu, Sipan and Derov, John and Urbas, Augustine M. and Ku, Zahyun and Sihn, Amy and Smith, Evan M. and Boyd, Darryl A. and Kim, Woohong and Sanghera, Jasbinder S. and et al.}, year={2021}, month={Nov} }
 @inproceedings{liu_islam_ku_urbas_derov_boyd_kim_sanghera_ryu_2021, title={Novel Nanocomposite Refractive Index Tuning Mechanism Based on Controlling Embedded Particle Morphology}, url={http://dx.doi.org/10.1115/imece2021-70064}, DOI={10.1115/imece2021-70064}, abstractNote={Abstract}, booktitle={Volume 3: Advanced Materials: Design, Processing, Characterization, and Applications}, publisher={American Society of Mechanical Engineers}, author={Liu, Sipan and Islam, Md Didarul and Ku, Zahyun and Urbas, Augustine M. and Derov, John and Boyd, Darryl A. and Kim, Woohong and Sanghera, Jasbinder S. and Ryu, Jong E.}, year={2021}, month={Nov} }
 @article{liu_islam_ku_boyd_zhong_urbas_smith_derov_nguyen_kim_et al._2021, title={Novel computational design of high refractive index nanocomposites and effective refractive index tuning based on nanoparticle morphology effect}, volume={223}, ISSN={["1879-1069"]}, url={https://doi.org/10.1016/j.compositesb.2021.109128}, DOI={10.1016/j.compositesb.2021.109128}, abstractNote={This study introduces a method to predict the refractive index (RI) of nanocomposites with the Finite Elements Analysis (FEA) based on the Fabry-Pérot interference. The efficacy was verified by comparing the estimated composites’ RI with the available data in the literature. In the experimental verification, the FEA-based prediction showed closer results with the measurement as compared to the effective medium approximation (EMA) approaches, which are prevalently used to predict the physical properties of nanocomposites. Due to the modeling capability, the FEA-method could investigate the effect of the nanoparticle morphology (particle size, shape, and orientation) and distribution. Large particle size, particle agglomeration in high electric-field amplitude region, and particle elongation along the light oscillating direction are found to be the major factors to enhance the RI of composites. The underlying mechanism of RI changing is attributed to the light scattering by embedded nanoparticles, which provides one potential real-time RI tuning schematic.}, journal={COMPOSITES PART B-ENGINEERING}, publisher={Elsevier BV}, author={Liu, Sipan and Islam, Md Didarul and Ku, Zahyun and Boyd, Darryl A. and Zhong, Yaxu and Urbas, Augustine M. and Smith, Evan and Derov, John and Nguyen, Vinh Q. and Kim, Woohong and et al.}, year={2021}, month={Oct} }
 @article{liu_islam_ku_urbas_boyd_kim_sanghera_ryu_2021, title={The polymer nanocomposites embedded particles size and agglomeration effect on the effective refractive index tuning}, volume={11802}, ISSN={["1996-756X"]}, url={http://dx.doi.org/10.1117/12.2594382}, DOI={10.1117/12.2594382}, abstractNote={The polymer nanocomposites have attracted increasing attention in the optical components that are miniaturized and integrated with wearable or portable electronics due to the polymer processibility and the tunability of the refractive index (RI) by adding nanoparticles. However, the lack of models predicting the composites’ RI attributed to the morphology, physical properties, as well as volume fraction of the nanoparticles poses difficulties in the design. This study investigates the effect of the size and agglomeration condition of the nanoparticles on the effective RI based on a Finite Element Analysis (FEA) method simulating the Fabry-Pérot resonance within the composite film. The result showed that larger particles (or particle clusters) could reinforce the RI of nanocomposites compared with the well-dispersed small particles. The particle-cluster model had lower RI than the single-solid-particle model with the same effective particle diameter, demonstrating that the particle cluster provides less scattering intensity than the single-solid-particle.}, journal={NANOENGINEERING: FABRICATION, PROPERTIES, OPTICS, THIN FILMS, AND DEVICES XVIII}, publisher={SPIE}, author={Liu, Sipan and Islam, Md Didarul and Ku, Zahyun and Urbas, Augustine M. and Boyd, Darryl A. and Kim, Woohong and Sanghera, Jasbinder S. and Ryu, Jong E.}, editor={Park, Wounjhang and Attias, André-Jean and Panchapakesan, BalajiEditors}, year={2021} }
 @inproceedings{islam_liu_derov_urbas_ku_boyd_kim_sanghera_nguyen_myers_et al._2021, title={Tunable mid-wavelength infrared (MWIR) polarizer by ORMOCHALC composite with improved thermomechanical stability}, url={http://dx.doi.org/10.1117/12.2594342}, DOI={10.1117/12.2594342}, abstractNote={Mid-wavelength infrared (MWIR, λ = 3 – 5 μm) materials are of great importance due to their applications in optical sensors and devices for military, industry, and non-invasive medical diagnostics. Specifically, MWIR polarimetry are used in biometric recognition and camouflaged detection. Recently, sulfur based organically modified chalcogenides (ORMOCHALC) polymers have been utilized to fabricate MWIR polarizers with competitive extinction coefficient to commercial polarizers, which are mostly made of expensive, brittle, and heavy inorganic materials. On the other hand, to adjust or reinforce the refractive index of the polymer, the chalcogenide content (i.e., sulfur, selenium) needs to be increased, which may result in adverse effects on the thermomechanical characteristics, including Young's modulus and lower glass transition temperature. This reduced thermomechanical stability compromises the structural integrity of ORMOCHALC-based optical devices. In this study, an ORMOCHALC polymer, poly(S–r–DIB), was reinforced with the zinc sulfide (ZnS) nanoparticles to simultaneously improve the refractive index and the thermomechanical properties. The addition of 20 wt% ZnS nanoparticles improves the pure polymer's glass transition temperature (Tg) from 9.6 °C to 31.4 °C, and the refractive index by Δn= 6.58 %. Then, subwavelength wire-grid polarizers were fabricated based on the pure ORMOCHALC first by a simple thermal imprinting method followed by metal deposition. The resulted MWIR polarizer showed a high extinction coefficient which is comparable with commercial polarizers. However, the structural integrity of the polarizers was compromised due to lower glass transition temperature. Finally, finite element analysis was conducted on the possible wire-grid polarizer fabrication utilizing optically and mechanically reinforced composites, as demonstrated in this study. If fabricated, these nanoparticles reinforced polarizers will possess superior structural integrity compared to ORMOCHALC polarizers. Moreover, these polarizers show a spectral selectivity as the transmission curve's resonance wavelength depends on the composite's refractive index, which is tunable by controlling the nanoparticles content. The resonance peak redshifted from 3.12 μm to 3.3 μm for the pure polymer to 20% ZnS reinforced ORMOCHALC polarizer. The extinction coefficient of the polarizer also improved in multiple wavelength bands in the MWIR. These polarizers with superior extinction coefficient, spectral selectivity, and improved thermomechanical stability demonstrate a broader prospect in MWIR optics.}, booktitle={Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIX}, publisher={SPIE}, author={Islam, Md Didarul and Liu, Sipan and Derov, John S. and Urbas, Augustine M. and Ku, Zahyun and Boyd, Darryl A. and Kim, Woohong R. and Sanghera, Jasbinder S. and Nguyen, Vinh Q. and Myers, Jason D. and et al.}, editor={Lu, Yu-Jung and Tanaka, Takuo and Tsai, Din PingEditors}, year={2021}, month={Aug} }
 @article{islam_kim_ko_ku_boyd_smith_nguyen_myers_baker_kim_et al._2020, title={Design of High Efficient Mid‐Wavelength Infrared Polarizer on ORMOCHALC Polymer}, volume={305}, ISSN={1438-7492 1439-2054}, url={http://dx.doi.org/10.1002/mame.202000033}, DOI={10.1002/mame.202000033}, abstractNote={Abstract}, number={5}, journal={Macromolecular Materials and Engineering}, publisher={Wiley}, author={Islam, Md Didarul and Kim, Jun Oh and Ko, Yeongun and Ku, Zahyun and Boyd, Darryl A. and Smith, Evan M. and Nguyen, Vinh Q. and Myers, Jason D. and Baker, Colin C. and Kim, Woohong and et al.}, year={2020}, month={Mar}, pages={2000033} }
 @article{islam_liu_boyd_zhong_nahid_henry_taussig_ko_nguyen_myers_et al._2020, title={Enhanced mid-wavelength infrared refractive index of organically modified chalcogenide (ORMOCHALC) polymer nanocomposites with thermomechanical stability}, volume={108}, ISSN={["1873-1252"]}, url={http://dx.doi.org/10.1016/j.optmat.2020.110197}, DOI={10.1016/j.optmat.2020.110197}, abstractNote={Abstract Organically modified chalcogenide (ORMOCHALC) polymers have proven to be alternatives to the conventional inorganic materials for mid-wavelength infrared (MWIR, λ = 3–5 μm) optical components. While the refractive index of ORMOCHALC can be reinforced by the content of chalcogenides such as sulfur (S) and selenium (Se), the increased portion of the S or Se deteriorate the thermomechanical stabilities. As a remedy, this study utilizes ZnS nanoparticles to reinforce both optical and thermomechanical properties of the sulfur-based ORMOCHALC polymer, poly(S-random-1,3-diisopropenylbenzene). The refractive index n and extinction coefficient k of the nanocomposites were characterized by Infrared Variable Angle Spectroscopic Ellipsometry (IR-VASE). The results show a significant increment in the refractive index of Δn = 6.58% at the wavelength of 4 μm by adding 20 wt% ZnS (or 7.29 vol%) in the ORMOCHALC polymer. The low extinction coefficient of the nanocomposites (}, journal={OPTICAL MATERIALS}, author={Islam, Md Didarul and Liu, Sipan and Boyd, Darryl A. and Zhong, Yaxu and Nahid, Masrur Morshed and Henry, Reece and Taussig, Laine and Ko, Yeongun and Nguyen, Vinh Q. and Myers, Jason D. and et al.}, year={2020}, month={Oct} }
 @article{kim_renteria‐marquez_islam_chavez_rosales_ahsan_tseng_love_lin_2019, title={Fabrication of bulk piezoelectric and dielectric BaTiO <inf>3</inf> ceramics using paste extrusion 3D printing technique}, volume={102}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85058797928&partnerID=MN8TOARS}, DOI={10.1111/jace.16242}, abstractNote={Abstract}, number={6}, journal={Journal of the American Ceramic Society}, publisher={Wiley}, author={Kim, Hoejin and Renteria‐Marquez, Anabel and Islam, Md Didarul and Chavez, Luis A. and Rosales, Carlos A. Garcia and Ahsan, Md Ariful and Tseng, Tzu‐Liang Bill and Love, Norman D. and Lin, Yirong}, year={2019}, pages={3685–3694} }
 @article{berndt_hwang_islam_sihn_urbas_ku_lee_czaplewski_dong_shao_et al._2019, title={Poly(sulfur-random-(1,3-diisopropenylbenzene)) based mid-wavelength infrared polarizer: Optical property experimental and theoretical analysis}, volume={176}, ISSN={["1873-2291"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85066071701&partnerID=MN8TOARS}, DOI={10.1016/j.polymer.2019.05.036}, abstractNote={Development of polymer based mid-wavelength infrared (MWIR) optics has been limited mainly due to high optical loss of organic polymers used in general optical components. In this study, a MWIR polarization grating based on a sulfuric polymer poly(sulfur-random-(1,3-diisopropenylbenzene)) with a low loss in the MWIR range was fabricated using a simple two-step process: imprint and metal deposition. Fourier-transform infrared (FTIR) spectroscopy measurement showed that this polymeric MWIR polarizer selectively transmitted the polarized IR in transverse magnetic (TM) mode over the transverse electric (TE) mode at normal incidence. The measured extinction ratios (η = The ratio of transmissions in TM and TE) were 208, 176, and 212 at the wavelength of 3, 4, and 5 μm, respectively. The computational simulation and analytical model confirmed that the enhanced TM transmission efficiency and η followed a Fabry-Pérot (FP) resonance mode within the created sulfuric polymer film. This polymeric MWIR polarizer demonstrated a great potential for broader applications in IR photonics to realize low-cost and durable optical components.}, journal={POLYMER}, publisher={Elsevier BV}, author={Berndt, Aaron J. and Hwang, Jehwan and Islam, Md Didarul and Sihn, Amy and Urbas, Augustine M. and Ku, Zahyun and Lee, Sang Jun and Czaplewski, David A. and Dong, Mengyao and Shao, Qian and et al.}, year={2019}, month={Aug}, pages={118–126} }
 @article{tanvir_islam_ahmed_2017, title={Analysis of thermoelastic characteristics in a thick walled FGM cylinder}, volume={1919}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85040996392&partnerID=MN8TOARS}, DOI={10.1063/1.5018548}, abstractNote={This study is concerned with the behavior of stress and strain in a thick walled functionally graded material (FGM) cylinder under internal pressure. The incompatible eigenstrain and equivalent eigenstrain developed in the cylinder, are taken into account. As a demonstration, a TiC/Al2O3 FGM cylinder is considered and different components of stress and strain are presented in order to study the effects of internal pressure, temperature difference (between room and sintering temperature), cylinder wall thickness and material distribution. The numerical result presented here shows that the thermoelastic characteristic like stress and strain of an FGM cylinder is significantly influenced by some of the above-mentioned parameters and can be controlled by properly controlling these parameters.}, journal={AIP Conference Proceedings}, publisher={Author(s)}, author={Tanvir, A. N. M. and Islam, Md. Didarul and Ahmed, Faisal}, year={2017} }
 @article{kim_torres_islam_islam_chavez_garcia rosales_wilburn_stewart_noveron_tseng_et al._2017, title={Increased piezoelectric response in functional nanocomposites through multiwall carbon nanotube interface and fused-deposition modeling three-dimensional printing}, volume={7}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85034586130&partnerID=MN8TOARS}, DOI={10.1557/mrc.2017.126}, abstractNote={Multiwall carbon nanotubes (MWCNTs) are utilized to resolve low coupling coefficient issue by dispersing MWCNTs in poly(vinylidene fluoride) matrix to create stress reinforcing network, dispersant, and electron conducting functions for barium titanate (BT) nanoparticles. Various BT and MWCNT percentages of nanocomposite film are fabricated by FDM three-dimensional (3D) printing which can simplify the fabrication process as well as lower cost and design flexibility. Increasing MWCNTs and BT particles gradually increase piezoelectric coefficient ( d _31) by 0.13 pC/N with 0.4 wt%-MWCNTs/18 wt%-BT. These results provide not only a technique to print piezoelectric nanocomposites but also unique materials combination for sensor application.}, number={4}, journal={MRS Communications}, author={Kim, H. and Torres, F. and Islam, M.T. and Islam, M.D. and Chavez, L.A. and Garcia Rosales, C.A. and Wilburn, B.R. and Stewart, C.M. and Noveron, J.C. and Tseng, T.-L.B. and et al.}, year={2017}, pages={960–966} }
 @article{kim_torres_islam_islam_chavez_rosales_wilburn_stewart_noveron_tseng_et al._2017, title={Increased piezoelectric response in functional nanocomposites through multiwall carbon nanotube interface and fused-deposition modeling three-dimensional printing – CORRIGENDUM}, volume={7}, DOI={10.1557/mrc.2017.129}, number={4}, journal={MRS Communications}, publisher={Cambridge University Press (CUP)}, author={Kim, Hoejin and Torres, Fernando and Islam, Tariqul and Islam, Didarul and Chavez, Luis A. and Rosales, Carlos A. Garcia and Wilburn, Bethany R. and Stewart, Calvin M. and Noveron, Juan C. and Tseng, Tzu-Liang B. and et al.}, year={2017}, pages={974–974} }