Article
Engineering, Mechanical
Deepak Kumar Pokkalla, Zhenpei Wang, Jee Chin Teoh, Leong Hien Poh, Chwee Teck Lim, Ser Tong Quek
Summary: An optimization framework was developed to design soft missing rib structures with controllable negative Poisson's ratios over large strains using isogeometric analysis and a genetic algorithm. The optimized design, fabricated using a biocompatible material, achieved deformation behavior similar to that of cat's skin, demonstrating its potential for biomedical applications.
JOURNAL OF ENGINEERING MECHANICS
(2022)
Article
Engineering, Mechanical
Deepak Kumar, Leong Hien Poh, Ser Tong Quek
Summary: This paper proposes an isogeometric shape optimization framework using genetic algorithm to design 2D auxetic structures with prescribed Poisson's ratio in the nonlinear deformation regime. The versatility of the framework is demonstrated through optimization of a missing rib structure under different loading conditions, showing manufacturability using NURBS and PolyJet 3D printing. Experimental results match well with numerical predictions, highlighting the need for further investigations on compression behavior in very flexible materials.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Engineering, Electrical & Electronic
Shuoke Xu, Xikui Ma, Yangyang Li, Yuanyuan Qu, Mingwen Zhao
Summary: Two-dimensional multiferroic materials provide a unique platform for the development of next-generation multifunctional devices. A stable 2D configuration of a lead oxide monolayer is proposed to achieve the coupling between ferroelectricity and ferroelasticity. This material can be used to regulate mechanical and electronic properties and design nanoscale devices.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Engineering, Mechanical
Maryam Morvaridi, Giorgio Carta, Federico Bosia, Antonio S. Gliozzi, Nicola M. Pugno, Diego Misseroni, Michele Brun
Summary: A novel two-dimensional hierarchical auxetic structure is proposed, utilizing interactions between different scale cuts to achieve a Poisson's ratio close to the minimum limit. Experimental validation on a polymeric specimen demonstrates the effectiveness of the structure, which shows potential for various engineering applications.
EXTREME MECHANICS LETTERS
(2021)
Article
Engineering, Mechanical
Pijak Tiraviriyaporn, Sontipee Aimmanee
Summary: The study aims to establish a universal failure criterion for various materials by using energy and polynomial invariants expansion approaches. The criterion reveals a new physical insight into the zero-energy bound and shows excellent agreement with experimental data. Additionally, a strength-Poisson's ratio relationship is derived for the first time.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Materials Science, Composites
Huan Hu, Xiaoshuang Ma, Yanan Li, Xian Ye, Lin Gan, Jin Huang
Summary: A meta-structure with isotropic negative Poisson's ratio (NPR) has been proposed by stacking Kirigami units in three-axis symmetrical cube-frameworks. The stable NPR is achieved through the degradability of the Hessian matrix in Hilbert-Einstein action of the Kirigami unit. Finite element analysis confirms the improvement in mechanical properties, which is explained by face constraint effects and the moderate modulus of materials. Additionally, the isotropic meta-structures show excellent potential in applications such as anti-collision beams, energy-absorbing boxes, and protective helmets.
COMPOSITES COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
V Harinarayana, Y. C. Shin
Summary: In this study, a comprehensive design and fabrication of a three-dimensional axisymmetric auxetic structure that exhibits uniform and axisymmetric transverse deformation under longitudinal compression loading is proposed. The design of the metamaterial is generated by revolving a two-dimensional parabolic curve along the axis of rotation and subsequently perforating the structure periodically with elliptical voids. The significance of the perforations is elucidated by comparing the metamaterial structure to a plain structure.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Mechanical
Weitao Lv, Dong Li, Liang Dong
Summary: This paper established a sandwich panel with a 3D isotropic foam core with negative Poisson's ratio using FEM, and found that the sandwich panel with the minimum Poisson's ratio core exhibited the highest blast resistance performance.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Multidisciplinary Sciences
Yue Hu, Jingwen Jiang, Peng Zhang, Zhuang Ma, Fuxin Guan, Da Li, Zhengfang Qian, Xiuwen Zhang, Pu Huang
Summary: In this study, nonlayered oxide monolayers with low exfoliation energy and intriguing physical properties were proposed. The most promising dielectric, GeO2, exhibited an auxetic effect and high kappa value, and could form heterostructures with other materials.
NATURE COMMUNICATIONS
(2023)
Article
Polymer Science
Adrian Bele, Mihaela Dascalu, Codrin Tugui, George-Theodor Stiubianu, Cristian-Dragos Varganici, Carmen Racles, Maria Cazacu, Anne Ladegaard Skov
Summary: Poly(dimethyl-co-methylvinyl)siloxane-alpha,omega-diols with 1.5%, 5.5%, and 8.5% vinyl group contents are synthesized via an environmentally friendly method and further chemically modified through a green process. The modified polymers exhibit higher dielectric permittivity and larger actuation strains compared to non-modified vinyl copolymers under similar conditions.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Engineering, Manufacturing
Yike Li, Zhuofan Li, Qi Wang, Zhenhua Wu, Congcan Shi, Shanfei Zhang, Yizhuo Xu, Xiaojun Chen, Aotian Chen, Chunze Yan, Yusheng Shi, Bin Su
Summary: This study fabricated porous magnetic soft materials with negative, zero, and positive Poisson's ratios using selective laser sintering. It was found that the lateral contraction of the negative Poisson's ratio magnetic soft materials resulted in the maximum electrical output. The experimental results were confirmed by finite element analysis and the electrical output of the magnetoelectric devices could be adjusted by altering cells' parameters and their array permutations.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Biomedical
J. Merson, N. Parvez, R. C. Picu
Summary: The study investigates indentation in network biomaterials and demonstrates a size effect that prevents the use of the Hertz model to infer the elastic constants of the material when the indenter radius is smaller than approximately 12 times the mean segment length of the network. The findings provide guidelines for selecting indentation conditions that ensure the applicability of the Hertz model. Additionally, the method can also be used to estimate the mean segment length of the network based on indentations with different indenter sizes.
ACTA BIOMATERIALIA
(2023)
Article
Instruments & Instrumentation
Dong Li, Guoyang Shen
Summary: This study proposed a series of isotropic negative Poisson's ratio (NPR) Voronoi foam models based on a modified Voronoi tessellation technique, and investigated their Poisson's ratio, stress-strain relationship, and energy absorption ability. The results showed that the proposed foam structure exhibited NPR, isotropic behavior, and superior energy absorption compared to isotropic NPR chiral lattice foam-filled tube.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Chemistry, Multidisciplinary
Ashutosh Giri, Austin M. Evans, Muhammad Akif Rahman, Alan J. H. McGaughey, Patrick E. Hopkins
Summary: This article demonstrates that stacks of two-dimensional covalent organic frameworks possess unique physical properties, including low densities, high thermal conductivities, and highly negative Poisson's ratios. These properties arise from their singular layered architecture and structural modularity.
Article
Engineering, Multidisciplinary
R. Bustamante, M. H. B. M. Shariff, M. Hossain
Summary: Magneto-electric soft materials show potential applications in various fields such as wireless energy harvesting, spintronics, and non-volatile memories. These materials polarize or magnetize under the application of magnetic or electric fields, and exhibit larger deformability compared to traditional hard materials, with intricate couplings between electric, magnetic, and mechanical phenomena.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2021)
Article
Instruments & Instrumentation
Haiyang Liu, Haoyu Guo, Meng Yang, Jianxing Liu, Tongqing Lu
Summary: The effects of voltage frequency, sensor size, and ion concentration on the sensitivity of a hydrogel iontronic sensor (HIS) were studied experimentally. The experimental results showed that sensitivity is highly dependent on frequency within a specific range. A theoretical model consisting of equations describing ion migration and hydrogel deformation was established, and it divided sensitivity into three frequency regions, which matched well with the experimental results. This study provides guidance for the design of highly sensitive HIS.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Chemistry, Multidisciplinary
Jianxing Liu, Haoyu Guo, Haiyang Liu, Tongqing Lu
Summary: This paper presents the development of hierarchical soft network materials (HSNMs) with developable lattice nodes, which can greatly enhance the stretchability of soft network materials (SNMs) without compromising their strength. The effects of geometric parameters, lattice topologies, and loading directions on the mechanical properties of HSNMs are systematically investigated through experiments and numerical simulations. The proposed node design strategy is also demonstrated to be applicable to different constituent materials, including polymers and metals.
Review
Engineering, Biomedical
Shunze Cao, Renheng Bo, Yihui Zhang
Summary: The advancement in material science and fabrication techniques has led to the booming of tissue engineering in recent years, covering tissue culture, repair, regeneration, and the rest. The regenerations of central/peripheral nerve and soft connective tissues, using polymeric scaffolds, have attracted intense research attention due to their indispensable roles in life-sustaining activities. This article outlines commonly used natural and synthetic polymeric materials for tissue scaffolds, discusses polymer-based hybrids, manufacturing approaches, and recent achievements and provides conclusions and outlooks for future research.
ADVANCED NANOBIOMED RESEARCH
(2023)
Article
Nanoscience & Nanotechnology
Zhanyu Wang, Renheng Bo, Haoran Bai, Shunze Cao, Shuheng Wang, Jiahui Chang, Yu Lan, Ying Li, Yihui Zhang
Summary: The study found that durian peel has a solid-liquid dual-phase structure, which can be used to design flexible impact-resistant composites by combining 3D lattices and shear thickening fluids. The resulting composites have low moduli under static conditions and excellent energy absorption upon dynamic impact. They hold promising potential for the development of next-generation flexible protection systems in wearable electronics and robotic systems.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Multidisciplinary
Yifei Luo, Mohammad Reza Abidian, Jong-Hyun Ahn, Deji Akinwande, Anne M. Andrews, Markus Antonietti, Zhenan Bao, Magnus Berggren, Christopher A. Berkey, Christopher John Bettinger, Jun Chen, Peng Chen, Wenlong Cheng, Xu Cheng, Seon-Jin Choi, Alex Chortos, Canan Dagdeviren, Reinhold H. Dauskardt, Chong-an Di, Michael D. Dickey, Xiangfeng Duan, Antonio Facchetti, Zhiyong Fan, Yin Fang, Jianyou Feng, Xue Feng, Huajian Gao, Wei Gao, Xiwen Gong, Chuan Fei Guo, Xiaojun Guo, Martin C. Hartel, Zihan He, John S. Ho, Youfan Hu, Qiyao Huang, Yu Huang, Fengwei Huo, Muhammad M. Hussain, Ali Javey, Unyong Jeong, Chen Jiang, Xingyu Jiang, Jiheong Kang, Daniil Karnaushenko, Ali Khademhosseini, Dae-Hyeong Kim, Il-Doo Kim, Dmitry Kireev, Lingxuan Kong, Chengkuo Lee, Nae-Eung Lee, Pooi See Lee, Tae-Woo Lee, Fengyu Li, Jinxing Li, Cuiyuan Liang, Chwee Teck Lim, Yuanjing Lin, Darren J. Lipomi, Jia Liu, Kai Liu, Nan Liu, Ren Liu, Yuxin Liu, Yuxuan Liu, Zhiyuan Liu, Zhuangjian Liu, Xian Jun Loh, Nanshu Lu, Zhisheng Lv, Shlomo Magdassi, George G. Malliaras, Naoji Matsuhisa, Arokia Nathan, Simiao Niu, Jieming Pan, Changhyun Pang, Qibing Pei, Huisheng Peng, Dianpeng Qi, Huaying Ren, John A. Rogers, Aaron Rowe, Oliver G. Schmidt, Tsuyoshi Sekitani, Dae-Gyo Seo, Guozhen Shen, Xing Sheng, Qiongfeng Shi, Takao Someya, Yanlin Song, Eleni Stavrinidou, Meng Su, Xuemei Sun, Kuniharu Takei, Xiao-Ming Tao, Benjamin C. K. Tee, Aaron Voon-Yew Thean, Tran Quang Trung, Changjin Wan, Huiliang Wang, Joseph Wang, Ming Wang, Sihong Wang, Ting Wang, Zhong Lin Wang, Paul S. Weiss, Hanqi Wen, Sheng Xu, Tailin Xu, Hongping Yan, Xuzhou Yan, Hui Yang, Le Yang, Shuaijian Yang, Lan Yin, Cunjiang Yu, Guihua Yu, Jing Yu, Shu-Hong Yu, Xinge Yu, Evgeny Zamburg, Haixia Zhang, Xiangyu Zhang, Xiaosheng Zhang, Xueji Zhang, Yihui Zhang, Yu Zhang, Siyuan Zhao, Xuanhe Zhao, Yuanjin Zheng, Yu-Qing Zheng, Zijian Zheng, Tao Zhou, Bowen Zhu, Ming Zhu, Rong Zhu, Yangzhi Zhu, Yong Zhu, Guijin Zou, Xiaodong Chen
Summary: Humans are increasingly relying on flexible sensors to address challenges and improve quality of life in the digital and big data era. However, the market adoption of flexible sensors is still limited despite advancements in research. In this paper, we identify the bottlenecks hindering the maturation of flexible sensors and propose potential solutions to expedite their deployment and commercialization.
Article
Materials Science, Multidisciplinary
Qing Liu, Zhangming Shen, Zhi Liu, Yumeng Shuai, Zengyao Lv, Tianqi Jin, Xu Cheng, Yihui Zhang
Summary: Three-dimensional (3D) cage-shaped mesostructures are widely used in 3D flexible electronics due to their unique cellular geometry and mechanical responses. This study investigates the snap-through behavior of cage-shaped mesostructures and demonstrates its potential for designing reconfigurable electronics. The findings provide new insights and guidelines for the design of 3D reconfigurable devices.
ACTA MECHANICA SOLIDA SINICA
(2023)
Article
Chemistry, Multidisciplinary
Feng Jiang, Gurunathan Thangavel, Xinran Zhou, Gupta Adit, Hongbo Fu, Jian Lv, Liuxiang Zhan, Yihui Zhang, Pooi See Lee
Summary: By leveraging the ferroelectricity-enhanced mechanism and the control of interfacial energy band bending, a lead-free perovskite-based (DF-CBA)(2)CuCl4/Al Schottky junction TVNG with excellent surface charge modulating capacity and controllable performance has been constructed. This TVNG device exhibits outstanding flexibility and long-term stability (>20,000 cycles), and can be used for detecting vibration and weights of different objects as well as harvesting energy from human motions and water waves.
ADVANCED MATERIALS
(2023)
Article
Mechanics
Wenbo Pang, Liya Liu, Shiwei Xu, Yumeng Shuai, Jianzhong Zhao, Yihui Zhang
Summary: Recently developed buckling-guided assembly methods have the potential to design and manufacture 3D mesostructures and microelectronic devices with superior performances and unusual functions. A new electroadhesion-mediated strategy allows for controlled adhesion during the assembly process, enabling the creation of various reconfigurable 3D mesostructures. An electromechanical model captures the delamination behavior of the film/substrate system, and an equivalent interface energy is proposed to quantify the contributions of electroadhesion and van der Waals' interactions.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2023)
Article
Materials Science, Multidisciplinary
Yumeng Shuai, Jianzhong Zhao, Renheng Bo, Yu Lan, Zengyao Lv, Yihui Zhang
Summary: Mechanically-guided three-dimensional assembly is a novel method for fabricating micro/nanoscale 3D structures and devices. It utilizes compressive buckling in a patterned high-modulus thin film integrated with a low-modulus elastomer substrate. To address the challenges of highly flexible 3D mesostructures or those with large-area suspended features, a wrinkling-assisted strategy is proposed to facilitate the delamination at desired regions. This strategy involves introducing an assisting layer with a weaker film/assisting-layer interface and utilizing wrinkles in the assisting layer to induce additional driving forces for separation.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Jun Wu, Yue Xiao, Yihui Zhang, Daining Fang
Summary: Liquid crystal elastomers (LCEs) are active polymers with excellent actuation performances. A constitutive model of LCE is established to capture the complex alignment under uniaxial/biaxial loading conditions by introducing a triaxial order tensor. Experimental validation shows the capability of the model in capturing complex thermomechanical responses and predicting actuation performances, which hold promising potential for applications in soft actuators and flexible robots.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Multidisciplinary Sciences
Xu Cheng, Zhichao Fan, Shenglian Yao, Tianqi Jin, Zengyao Lv, Yu Lan, Renheng Bo, Yitong Chen, Fan Zhang, Zhangming Shen, Huanhuan Wan, Yonggang Huang, Yihui Zhang
Summary: We present a rational microlattice design that enables the transformation of 2D films into programmable 3D curved mesosurfaces through mechanically guided assembly. Shape programming is achieved through analytical modeling and a machine learning-based computational approach, determining the heterogeneous 2D microlattice patterns necessary for target 3D curved surfaces. We demonstrate the versatility of this method with various geometries and applications, such as a conformable cardiac electronic device, a stingray-like dual mode actuator, and a 3D electronic cell scaffold.
Review
Multidisciplinary Sciences
Tongxiang Tang, Zhonghui Shen, Jian Wang, Shiqi Xu, Jiaxi Jiang, Jiahui Chang, Mengfan Guo, Youjun Fan, Yao Xiao, Zhihao Dong, Houbing Huang, Xiaoyan Li, Yihui Zhang, Danyang Wang, Long-Qing Chen, Ke Wang, Shujun Zhang, Ce-Wen Nan, Yang Shen
Summary: This study reports a highly stretchable/compressible piezoelectric composite composed of a ferroelectric ceramic skeleton, elastomer matrix, and relaxor ferroelectric-based hybrid at the ceramic/matrix interface as dielectric transition layers, demonstrating a giant piezoelectric coefficient, high electromechanical coupling factor, and superior flexibility. These polymer composites with ultrahigh piezoelectric properties are expected to drive emerging applications in flexible smart electronics.
NATIONAL SCIENCE REVIEW
(2023)
Article
Materials Science, Multidisciplinary
Tianqi Jin, Xu Cheng, Shiwei Xu, Yuchen Lai, Yihui Zhang
Summary: Buckling-guided assembly of 3D mesostructures from 2D precursor patterns has gained attention for developing advanced electronic devices. This study proposes an inverse design method based on the point-cloud deep learning neural network (DLNN) model. A structure-based database is established for diverse 2D precursor patterns, enabling accurate mapping between 3D structures and their corresponding 2D precursors. The proposed method shows high efficiency and accuracy in computational and experimental demonstrations.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Mechanics
Xu Cheng, Shiwei Xu, Tianqi Jin, Zhangming Shen, Yihui Zhang
Summary: Three-dimensional buckled ribbon mesostructures have significant implications in engineering fields for their novel functionalities and optimized mechanical properties. This study investigates the bifurcation and mode transition of buckled ribbons through theoretical modeling, computational simulations, and experimental observations. By establishing a theoretical model, phase diagrams for different deformation paths and modes are determined. The multi-step bifurcation is mainly attributed to Euler buckling and multiple wave instabilities. The findings are applied to design a tri-stable mesostructure for reconfigurable 3D antennas with finely tunable frequency and radiation pattern.
MECHANICS RESEARCH COMMUNICATIONS
(2023)
Review
Automation & Control Systems
Wenbo Pang, Shiwei Xu, Liya Liu, Renheng Bo, Yihui Zhang
Summary: This review provides an overview of the design, manufacturing, and mechanisms of thin-film-shaped flexible actuators (TFFAs), highlighting their applications in various fields such as biomedicine, environmental exploration, haptic interfaces, and reconfigurable electronics. The article also discusses the grand challenges and open opportunities in this exciting direction.
ADVANCED INTELLIGENT SYSTEMS
(2023)
Article
Chemistry, Physical
Yiping Yin, Zhe Wang, Hua Zou
Summary: This study presents a novel method for preparing dimpled polymer-silica nanocomposite particles using interfacial swelling-based seeded polymerization. The optimized conditions allow for a relatively high percentage of dimpled particles to be achieved.
Article
Chemistry, Physical
Brenden D. Hoehn, Elizabeth A. Kellstedt, Marc A. Hillmyer
Summary: Porous materials with nanometer-scale pores have important applications as nanoporous membranes. In this study, ABA triblock copolymers were used as precursors to produce nanoporous polymeric membranes (NPMs) in thin film form by degrading the end blocks. Polycyclooctene (PCOE) NPMs with tunable pore sizes were successfully prepared using solvent casting technique. Oxygen plasma etching was employed to improve the surface porosity and hydrophilicity of the membranes. This study provides a straightforward method to produce tough NPMs with high porosity and hydrophilic surface properties.
Article
Chemistry, Physical
Vladislav S. Petrovskii, Stepan I. Zholudev, Igor I. Potemkin
Summary: This article investigates the behavior of linear and ring polypeptide chains in aqueous solution and explores the properties of the complexes formed by these chains with oppositely charged surfactants. The results demonstrate that the complexes of linear supercharged unfolded polypeptides and the corresponding surfactants exhibit impressive adhesive properties.
Article
Chemistry, Physical
Merve Cevik, Serkan Dikici
Summary: Cardiovascular diseases are a leading cause of death globally, and vascular grafts are a promising treatment option. This study focuses on tissue-engineered vascular grafts (TEVGs) using decellularized parsley stems as a potential biomaterial. The decellularized parsley stems showed suitable properties for TEVGs, providing a suitable environment for human endothelial cells to form a pseudo endothelium. This study showcases the potential of using parsley stems for TEVGs.
Article
Chemistry, Physical
Gustavo A. Vasquez-Montoya, Tadej Emersic, Noe Atzin, Antonio Tavera-Vazquez, Ali Mozaffari, Rui Zhang, Orlando Guzman, Alexey Snezhko, Paul F. Nealey, Juan J. de Pablo
Summary: The optical properties of liquid crystals are typically controlled by electric fields. In this study, we investigate the effects of microfluidic flows and acoustic fields on the molecular orientation and optical response of nematic liquid crystals. We identify several previously unknown structures and explain them through calculations and simulations. These findings hold promise for the development of new systems combining sound, flow, and confinement.
Article
Chemistry, Physical
Xinjun Wu, Xin Guan, Shushu Chen, Jiangpeng Jia, Chongyi Chen, Jiawei Zhang, Chuanzhuang Zhao
Summary: This research presents a novel shape memory hydrogel with a remodelable permanent shape and programmable cold-induced shape recovery behavior. The hydrogel is prepared using specific treatment methods to achieve shape fixation by heating and shape recovery by cooling. Additionally, deformable devices can be obtained by assembling hydrogel blocks with different concentrations.
Article
Chemistry, Physical
Rebecca Hengsbach, Gerhard Fink, Ulrich Simon
Summary: This study examines the properties of DNA functionalized pNipmam microgels and pure pNipmam microgels at different concentrations of sodium chloride and in PBS solutions using temperature dependent H-1-NMR measurements. The results show that DNA modification affects the volume phase transition temperature and the addition of salt and PBS further enhances this effect.
Article
Chemistry, Physical
Ningyi Li, Junhong Li, Lijingting Qing, Shicheng Ma, Yao Li, Baohui Li
Summary: This paper investigates the self-assembly behavior of colloids with competing interactions under spherical confinement and finds that different ordered structures can be formed under different sized spherical confinements. Moreover, more perforated structures are formed in smaller spheres.