@article{aly_muhuri_bradford_2021, title={Fabrication of scalable, aligned and low density carbon nanotube/silicon carbide hybrid foams by polysilazane infiltration and pyrolysis}, volume={41}, ISSN={["1873-619X"]}, DOI={10.1016/j.jeurceramsoc.2020.12.035}, abstractNote={Polymer-derived ceramic (PDC) process is an attractive technique that has high ceramic yield. This versatile method allows for fabrication of porous carbon nanotube (CNT)/ silicon carbide (SiC) hybrid materials that is important high temperature structural applications. Although several forms of CNT assemblies have been used with the PDC approach, the fabricated CNT/ceramic nanocomposites were either one or two dimensional. Herein, we report, for the first time, the fabrication of a low density, three-dimensional (3D) and scalable CNT/SiC structure using PDC technique. It was synthesized by impregnating preceramic polysilazane (PSZ) into ultralow density, anisotropic, and highly aligned CNT foams, followed by thermosetting and pyrolysis processes. The ceramic phase conformally coated the CNTs. The X-ray diffraction (XRD) diffractogram confirmed the presence of β-SiC crystalline phase. The resulting hybrid foam inherited the morphology and form factor of the original CNT foam, and possessed mechanical robustness, improved electrical properties, and extraordinary thermal stability.}, number={6}, journal={JOURNAL OF THE EUROPEAN CERAMIC SOCIETY}, author={Aly, Karim and Muhuri, Abir K. and Bradford, Philip D.}, year={2021}, month={Jun}, pages={3303–3313} }
 @article{aly_lubna_bradford_2021, title={Low density, three-dimensionally interconnected carbon nanotube/silicon carbide nanocomposites for thermal protection applications}, volume={41}, ISSN={["1873-619X"]}, DOI={10.1016/j.jeurceramsoc.2020.06.020}, abstractNote={Synthesis of silicon carbide (SiC) nanostructures and their composites has been a topic of interest for the scientific community due to the unique properties that can be obtained with nanoscale features. Herein, we report the scalable fabrication of anisotropic and low density, carbon nanotube/SiC (CNT/SiC) core-shell structures synthesized via chemical vapor infiltration (CVI) of silicon on aligned CNT foams followed by heat treatment at 1350 °C. Structures made of CNT/SiC nanotube networks with a thickness of 1 cm and length of 9 cm were prepared in the present work. Upon the removal of the CNT foam via calcination of the hybrid nanocomposite in air, a free-standing mechanically robust three-dimensional network of pure SiC nanotubes was left behind. The density of the synthesized CNT/SiC is the lowest reported for any C/SiC structure. Furthermore, the CNT/SiC hybrid nano-architecture demonstrated superb heat resistance and stability in ultrahigh temperature environment.}, number={1}, journal={JOURNAL OF THE EUROPEAN CERAMIC SOCIETY}, author={Aly, Karim and Lubna, Mostakima and Bradford, Philip D.}, year={2021}, month={Jan}, pages={233–243} }
 @article{aly_aboubakr_bradford_2021, title={One-step fabrication of bulk nanocomposites reinforced by carbon nanotube array fragments}, volume={10}, ISSN={["1548-0569"]}, url={https://doi.org/10.1002/pc.26359}, DOI={10.1002/pc.26359}, abstractNote={Abstract}, journal={POLYMER COMPOSITES}, publisher={Wiley}, author={Aly, Karim and Aboubakr, Sherif H. and Bradford, Philip D.}, year={2021}, month={Oct} }
 @article{wang_yildiz_li_aly_qiu_jiang_pui_chen_bradford_2020, title={High temperature carbon nanotube - Nanofiber hybrid filters}, volume={236}, ISSN={["1873-3794"]}, DOI={10.1016/j.seppur.2019.116255}, abstractNote={Novel hybrid filters composed of aligned carbon nanotube (CNT) sheets, sandwiched between electrospun polyimide (PI) nanofiber membranes serving as the supporting layers, were fabricated for the capture of fine particles. The CNT sheets and PI nanofiber membranes were thermally bonded together by melting electrospun polyetherimide (PEI) nanofibers. Two different kinds of filter structures were prepared, where multiple layers of aligned CNT sheets were either stacked together on top of each other or separated from each other by a PEI layer. The filtration performance tests showed that the filtration efficiency increased with increasing number of CNT sheets. The maximum filtration efficiency reached 99.99% at 5.3 cm/s face velocity for 0.3 μm particles by the 4-layer CNT filter, while the pressure drop was only 120 Pa. In mechanical testing, the CNT sheets also reinforced the hybrid filters, even though the PI nanofiber membrane already had relatively high mechanical properties. The tensile strength of the 4-layer CNT hybrid filters was 9 MPa, reaching the highest tier of strength reported for nanofiber membranes. In addition to high efficiency and low pressure drop, the hybrid all-nanofiber filters are also targeted for use in hot gas filtration applications where temperatures reach 200–250 °C.}, journal={SEPARATION AND PURIFICATION TECHNOLOGY}, author={Wang, Qiannan and Yildiz, Ozkan and Li, Ang and Aly, Karim and Qiu, Yiping and Jiang, Qiuran and Pui, David Y. H. and Chen, Sheng-Chieh and Bradford, Philip D.}, year={2020}, month={Apr} }
 @article{aly_bradford_2019, title={Real-time impact damage sensing and localization in composites through embedded aligned carbon nanotube sheets}, volume={162}, ISSN={["1879-1069"]}, url={https://doi.org/10.1016/j.compositesb.2018.12.104}, DOI={10.1016/j.compositesb.2018.12.104}, abstractNote={Carbon nanotubes (CNTs) have shown potential as a good candidate for performing strain and damage sensing in composites, however, the number of studies that have examined CNTs piezoresistive response under impact is limited. This paper investigates a novel technique for real-time damage sensing during and after impact strikes on composite laminates. In this technique, aligned CNT sheets layers are distributed through the thickness to monitor the developing damage in the host structure's impact side, mid-plane and non-impact side. This is accomplished through measuring the CNT sheets' in-plane electrical resistance changes simultaneously and linking them to the impact damage modes in the structure. The experimental results demonstrate the CNT layers' ability to detect, locate and quantify impact damage when the host structure undergoes different types of impacts. The results highlight the CNT sensing layers high sensitivity to damage accumulation.}, journal={COMPOSITES PART B-ENGINEERING}, publisher={Elsevier BV}, author={Aly, Karim and Bradford, Philip D.}, year={2019}, month={Apr}, pages={522–531} }
 @article{aly_li_bradford_2017, title={Compressive piezoresistive behavior of carbon nanotube sheets embedded in woven glass fiber reinforced composites}, volume={116}, ISSN={["1879-1069"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85006298233&partnerID=MN8TOARS}, DOI={10.1016/j.compositesb.2016.11.002}, abstractNote={Due to the difficulties associated with performing compression tests and the complex nature of compression failure, the number of studies that have examined the piezoresistive response of carbon nanotube (CNT) sensing networks in composites under compression loading has been limited. This paper introduces a novel technique for embedding aligned sheets of two millimeter long, interconnected CNTs into the interlaminar region of laminated composite structures to assess the potential of the CNT sheets to function as strain sensing materials for composite structures subjected to axial compression loading. Quasi-static and cyclic compression mechanical loading tests were accompanied by real time electrical resistance change data acquisition and the results suggested that the CNT sheet sensing material composed of six CNT sheets layers exhibited improved sensitivity, stability and repeatability which are vital properties for any successful health monitoring technique. The coupons with six CNT sheets layers embedded exhibited piezoresistivity that showed some linearity in tension and was nonlinear in compression. This piezoresistive response was characterized as anti-symmetric around zero strain all the way until fracture.}, journal={COMPOSITES PART B-ENGINEERING}, author={Aly, Karim and Li, Ang and Bradford, Philip D.}, year={2017}, month={May}, pages={459–470} }
 @article{zhu_yildirim_aly_shen_chen_lu_jiang_kim_tonelli_pasquinelli_et al._2016, title={Hierarchical multi-component nanofiber separators for lithium polysulfide capture in lithium-sulfur batteries: an experimental and molecular modeling study}, volume={4}, ISSN={["2050-7496"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84984804707&partnerID=MN8TOARS}, DOI={10.1039/c6ta04577d}, abstractNote={A multi-functional nanofiber membrane significantly improves the overall performance of Li–S batteries.}, number={35}, journal={JOURNAL OF MATERIALS CHEMISTRY A}, publisher={Royal Society of Chemistry (RSC)}, author={Zhu, Jiadeng and Yildirim, Erol and Aly, Karim and Shen, Jialong and Chen, Chen and Lu, Yao and Jiang, Mengjin and Kim, David and Tonelli, Alan E. and Pasquinelli, Melissa A. and et al.}, year={2016}, pages={13572–13581} }
 @article{aly_li_bradford_2016, title={Strain sensing in composites using aligned carbon nanotube sheets embedded in the interlaminar region}, volume={90}, ISSN={["1878-5840"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84983749060&partnerID=MN8TOARS}, DOI={10.1016/j.compositesa.2016.08.003}, abstractNote={This paper introduces a novel technique for embedding aligned sheets of two millimeters long, interconnected CNTs into the interlaminar region of composite structures. The potential of these embedded CNT sheets to function as damage detecting and strain sensing elements was demonstrated via various mechanical tests that were accompanied by real time electrical resistance change data acquisition. The experimental results suggested that the CNT sheet sensitivity could be further enhanced by an oxygen plasma treatment and also by pre-straining the CNT sheets before embedding them. The samples containing two CNT sheets layers exhibited long term stability, sensitivity and repeatability which are vital features for health monitoring.}, journal={COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING}, author={Aly, Karim and Li, Ang and Bradford, Philip D.}, year={2016}, month={Nov}, pages={536–548} }
 @article{oman_van hoe_aly_peters_van steenberge_stan_schultz_2015, title={Instrumentation of integrally stiffened composite panel with fiber Bragg grating sensors for vibration measurements}, volume={24}, ISSN={["1361-665X"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84938117649&partnerID=MN8TOARS}, DOI={10.1088/0964-1726/24/8/085031}, abstractNote={We evaluate the performance of fiber Bragg grating (FBG) sensors for the measurement of dynamic strains in complex composite structures. The particular structure used in this study is an integrally stiffened composite panel for which the stiffeners and skin are fabricated in a single layup and cure process. Surface-mounted FBG sensors are bonded to the panels after curing, whereas embedded FBG sensors are successfully incorporated during the fabrication process. A finite element model was also constructed of the stiffened panel. The panels were subjected to repeated impacts and the post-impact vibration response of the panel was measured through the FBG sensor responses. Little change to the global response of the panel was observed after the repeated impacts, through the dynamic response of the surface-mounted FBGs. Pulsed phase thermography and micro-computer-tomography imaging of the panel confirmed that the damage was localized near the impact locations, producing negligible changes to the global response of the panel. All of the embedded FBG sensors survived the fabrication and multiple impacts; however, as these were embedded close to the neutral axis of the panel, they were not very sensitive to the vibration modes. Excitation of the panel near the first natural frequency did produce a measurable response in the FBG sensors, confirming their functionality.}, number={8}, journal={SMART MATERIALS AND STRUCTURES}, author={Oman, Kyle and Van Hoe, Bram and Aly, Karim and Peters, Kara and Van Steenberge, Geert and Stan, Nikola and Schultz, Stephen}, year={2015}, month={Aug} }
 @inproceedings{aly_li_bradford_2015, title={Strain and damage sensing in composites via embedded CNT sheets}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84970015979&partnerID=MN8TOARS}, booktitle={Fiber Society 2015 Fall Meeting and Technical Conference - Fibers: Where Tradition Meets Innovation}, author={Aly, K. and Li, A. and Bradford, P.D.}, year={2015} }