A5019263952- Advanced Sensor and Energy Harvesting Materials
- Advanced Materials and Mechanics
- Hydrogels: synthesis, properties, applications
- Dielectric materials and actuators
- Vibration Control and Rheological Fluids
- Micro and Nano Robotics
- Elasticity and Material Modeling
- Ferroelectric and Piezoelectric Materials
- Structural Analysis and Optimization
- Polymer composites and self-healing
- Modular Robots and Swarm Intelligence
- Electromagnetic wave absorption materials
- Soft Robotics and Applications
- Adhesion, Friction, and Surface Interactions
- Tactile and Sensory Interactions
- Polymer Nanocomposites and Properties
- Numerical methods in engineering
- Surface Modification and Superhydrophobicity
- Supramolecular Self-Assembly in Materials
- Structural Engineering and Vibration Analysis
- Electrospun Nanofibers in Biomedical Applications
- Mechanical Behavior of Composites
- Fluid Dynamics and Thin Films
- Conducting polymers and applications
- Semiconductor materials and devices
Southern University of Science and Technology
2018-2025
Jiangnan University
2025
Liaoning Technical University
2020-2022
Hokkaido University
2016-2021
East China University of Science and Technology
2021
Iowa State University
2011-2020
Yanshan University
2012-2020
Sun Yat-sen University
2020
Harbin Institute of Technology
2019
Wuhan University of Technology
2014-2019
When a voltage is applied to layer of dielectric elastomer, the reduces in thickness and expands area. A recent experiment has shown that homogeneous deformation can be unstable, giving way an inhomogeneous deformation, such regions two kinds coexist layer, one being flat other wrinkled. To analyze this instability, we construct for class model materials, which call ideal elastomers, free-energy function comprising contributions from stretching polarizing. We show typically nonconvex,...
Polymer composites with electrically conductive fillers have been developed as mechanically flexible, easily processable electromagnetic interference (EMI) shielding materials. Although there are a few elastomeric nanostructured silvers and carbon nanotubes showing moderate stretchability, their EMI effectiveness (SE) deteriorates consistently stretching. Here, highly stretchable polymer composite embedded three-dimensional (3D) liquid-metal (LM) network exhibiting substantial increases of...
Many engineering devices and natural phenomena involve gels that swell under the constraint of hard materials. The causes a field stress in gel, often makes swelling inhomogeneous even when gel reaches state equilibrium. This paper develops theory constrained pH-sensitive hydrogel, network polymers bearing acidic groups, equilibrium with an aqueous solution mechanical forces. condition is expressed as variational statement field. A free-energy function accounts for stretching network, mixing...
Abstract Subject to a voltage, dielectric elastomer (DE) deforms. Voltage‐induced strains of above 100% have been observed when DEs are prestretched, and for certain network structures. Understanding mechanisms large actuation is an active area research. We propose that the voltage‐stretch response may be modified by prestretch, or using polymers with “short” chains. This modification results in suppression elimination electromechanical instability, leading strains. method select design DE,...
Abstract Flexible electronic skins (e‐skins) with high sensitivity and broad‐range pressure sensing are highly desired in artificial intelligence, human–machine interaction. Capacitive‐type e‐skins have a simple configuration, but the change dimensions of dielectric layer is often quite limited, although introducing surface microstructures might improve some extent. Moreover, such structures typically require costly microfabrication methods to fabricate. Here, low‐cost microstructured ionic...
New hierarchical bioinspired nanocomposite materials of poly(vinyl alcohol)/poly(acrylic acid)/carboxylate graphene oxide nanosheet@polydopamine (PVA/PAA/GO-COOH@PDA) were successfully prepared by electrospinning technique, thermal treatment, and polydopamine modification. The obtained composite membranes are composed polymeric nanofibers with carboxylate nanosheets, which anchored on the fibers heat-induced cross-linking reaction. preparation process demonstrate eco-friendly controllable...
Two-dimensional lattice structures with specific geometric features have been reported to a negative Poisson's ratio, termed as auxetic metamaterials, that is, stretching-induced expansion in the transversal direction. In this paper, we designed novel metamaterial; by utilizing shape memory effect of constituent materials, in-plane moduli and ratios can be continuously tailored. During deformation, curved meshes ensure rotation mesh joints achieve auxetics. The rotations these are governed...
Many creatures have the ability to traverse challenging environments by using their active muscles with anisotropic structures as motors in a highly coordinated fashion. However, most artificial robots require multiple independently activated actuators achieve similar purposes. Here we report hydrogel-based, biomimetic soft robot capable of multimodal locomotion fueled and steered light irradiation. A muscle-like poly(N-isopropylacrylamide) nanocomposite hydrogel is prepared electrical...
Abstract Materials capable of shape‐morphing and/or fluorescence imaging have practical significances in the fields anti‐counterfeiting, information display, and protection. However, it's challenging to realize these functions hydrogels due poor mechanical properties lack tunable fluorescence. A tough hydrogel with good shape‐memory ability phototunable is reported here, which affords reprogrammable shape designing encoding for dual‐encryption. This prepared by incorporating donor–acceptor...
Proteins of thermophiles are thermally stable in a high-temperature environment, adopting strategy enhancing the electrostatic interaction hydrophobic media at high temperature. Herein, inspired by molecular mechanism proteins, synthesis novel polymer materials that undergo ultrarapid, isochoric, and reversible switching from soft hydrogels to rigid plastics elevated temperature is reported. The developed versatile, inexpensive, nontoxic poly(acrylic acid) containing calcium acetate. By...
Abstract Morphing hydrogels have versatile applications in soft robotics, flexible electronics, and biomedical devices. Controlling component distribution internal stress within a hydrogel is crucial for shape‐changing. However, existing gradient structures of are usually non‐reconstructable, once encoded by chemical reactions covalent bonds. Fabricating with distinct inevitable every new configuration, resulting poor reusability, adaptability, sustainability that disadvantageous diverse...
Abstract Steering soft robots in a self-regulated manner remains grand challenge, which often requires continuous symmetry breaking and recovery steps for persistent motion. Although structural morphology is found significant robotic functions, geometric topology has rarely been considered appreciated. Here we demonstrate series of knotbots, namely hydrogel-based with knotted structures, capable autonomous rolling spinning/rotating motions. With broken by external stimuli restored...
Abstract Self‐sustained motions are widespread in biological systems by harvesting energy from surrounding environments, which inspire scientists to develop autonomous soft robots. However, most‐existing robots require dynamic heterogeneous stimuli or complex fabrication with different components. Recently, control of topological geometry has been promising afford physical intelligence and thus life‐like motions. Reported here a series closed twisted ribbon robots, exhibit self‐sustained...
When a block of an elastomer is bent, the compressed surface may form crease. The critical strain for creasing measured experimentally known to disagree with that predicted by linear perturbation analysis. This paper calculates comparing elastic energy in creased body and smooth body. difference expressed scaling relation. Critical conditions are determined elastomers subject general loads gels swelling under constraint. theoretical results compared existing experimental observations.
A compressively strained film on a substrate can wrinkle into intricate patterns. This Rapid Communication studies the evolution of The is modeled as an elastic nonlinear plate and viscoelastic foundation. spectral method developed to evolve system. When initial strains are isotropic, wrinkles pattern with motif zigzag segments, in random orientations. anisotropic, array herringbones or stripes. segments select width, length, elbow angle that minimize total energy.
Abstract A series of ferroelectric ceramic models with grain and grain‐boundary structures different sizes are established via Voronoi tessellations. phase‐field model is introduced to study the dielectric breakdown strength these ceramics. Afterward, relation between electric displacement field hysteresis loop calculated using a finite element method based on classical modified hyperbolic tangent model. The results indicate that as size decreases, enhanced, but permittivity reduced....
Double network (DN) gels, consisting of a brittle first and flexible second network, have been known to be extremely tough functional hydrogels. In DN gel subjected force, the breaks prior fracture network. This process, referred as internal fracture, dissipates energy increases required completely gels. Such macroscopically appears yielding-like phenomenon. The aim this paper is investigate relationship between yield point molecular structure gels more deeply understand mechanism To achieve...
Recently, many tough and self-healing hydrogels have been developed based on physical bonds as reversible sacrificial bonds. As breaking re-forming of are time-dependent, these viscoelastic the deformation rate temperature pronouncedly influence their fracture behavior. Using a polyampholyte hydrogel model system, we observed that time–temperature superposition principle is obeyed not only for small strain rheology but also large hysteresis energy dissipation below certain temperature. The...