A5086361259- Advanced Sensor and Energy Harvesting Materials
- Polymer composites and self-healing
- Conducting polymers and applications
- Dielectric materials and actuators
- Polymer Nanocomposites and Properties
- Electrospun Nanofibers in Biomedical Applications
- biodegradable polymer synthesis and properties
- Polydiacetylene-based materials and applications
- Tactile and Sensory Interactions
- Thermal properties of materials
- Synthesis and properties of polymers
- Polymer Synthesis and Characterization
- Transition Metal Oxide Nanomaterials
- Natural Fiber Reinforced Composites
- Welding Techniques and Residual Stresses
- Nanomaterials and Printing Technologies
- Carbon dioxide utilization in catalysis
- Thermal and Kinetic Analysis
- Silicone and Siloxane Chemistry
- Advanced Materials and Mechanics
- Supercapacitor Materials and Fabrication
- Advanced Battery Technologies Research
- Laser and Thermal Forming Techniques
- Machine Learning in Materials Science
- Marine Sponges and Natural Products
Nanyang Technological University
2018-2024
Technology Innovation Institute
2023
Indian Institute of Chemical Technology
2012-2018
Ulsan National Institute of Science and Technology
2017-2018
University of Ulsan
2016-2017
Central Institute of Plastics Engineering and Technology
2014-2016
Bharat Heavy Electricals (India)
1995-2013
Abstract Advances in next-generation soft electronic devices rely on the development of highly deformable, healable, and printable energy generators to power these electronics. Development deformable or wearable that can simultaneously attain extreme stretchability with superior healability remains a daunting challenge. We address this issue by developing conductive, extremely stretchable, healable composite based thermoplastic elastomer liquid metal silver flakes as stretchable conductor...
Stretchable and self-healing (SH) energy storage devices are indispensable elements in energy-autonomous electronic skin. However, the current collectors not self-healable nor intrinsically stretchable, they mostly rely on strain-accommodating structures that require complex processing, often limited stretchability, suffer from low device packing density fragility. Here, an SH conductor comprising nickel flakes, eutectic gallium indium particles (EGaInPs), carboxylated polyurethane (CPU) is...
For emerging biocompatible, wearable, and stretchable epidermal electronic devices, it is essential to realize novel conductors with the attributes of transparency, low-cost nontoxic components, green-solvent processbility, self-healing, thermal stabililty. Although conducting materials-rubber composites, ionic hydrogels, organogels have been developed, no material system that meets all outlined requirements has reported. Here, a series P(SPMA-r-MMA) polymers different ratios side chains...
Abstract Soft robots are susceptible to premature failure from physical damages incurred within dynamic environments. To address this, we report an elastomer with high toughness, room temperature self‐healing, and strong adhesiveness, allowing both prevention of recovery for soft robotics. By functionalizing polyurethane hierarchical hydrogen bonds ureido‐4[1H]‐pyrimidinone (UPy) carboxyl groups, toughness (74.85 MJ m −3 ), tensile strength (9.44 MPa), strain (2340%) can be achieved....
Electroadhesion provides a promising route to augment robotic functionalities with continuous, astrictive, and reversible adhesion force. However, the lack of suitable conductive/dielectric materials processing capabilities have impeded integration electroadhesive modules into soft robots requiring both mechanical compliance robustness. We present herein an iontronic adhesive based on dynamically crosslinked gel-elastomer system, including ionic organohydrogel as electrodes resilient...
The thermal induced temporal changes of microstructured shape memory polymer for self-recovery triboelectric nanogenerator can be indigenously harnessed water energy harvesting and temperature sensing, simultaneously. Here, tunable microarchitectures a thermally triggered are realized by electrospinning, namely mats microfibers (MFs), microspheres (MSs), microspheres-nanofibers (MSNFs). microarchitectured nanogenerators (mSM-TENG) exhibit self-restoring ability in both macro micro...
A series of biobased polyurethane–siloxane cross-linked coatings were prepared using castor oil, partially Tolonate, and 3-aminopropyl trimethoxysilane. The 29Si NMR spectra was used to determine the formation cross-linking structure system. FT-IR studies verified that a hydrogen bonding interaction existed at interface oil-based moieties, thereby shifting characteristic peak position N–H C═O groups higher field values. curing process dispersions followed by means gel content measurements....
A previously unknown gas-solid interacted power generation is developed using triboelectric effect. We designed an adhesive, gas-tight, and self-healing supramolecular polysiloxane-dimethylglyoxime-based polyurethane (PDPU) porous elastomer based on segmented oxime-carbamate-urea. It intrinsically negative material with trapped air within closed voids, exhibiting ultrahigh static surface potential excellent compressibility. This PDPU generates electricity from interactions between the...
Abstract The emergence of soft electronics has led to the need for thermal management with deformable material. Recent efforts have focused on incorporating EGaIn microparticles ( ≈ 10 1 µm) into elastomer forming a conductive composites. However, shape deformation and coalescence particles under mechanical stress often lead parasitic electrical conduction, imposing limitations its utilization in management. Increasing loading nanoparticles (>20 vol%) leads brittleness composite. Herein,...
We rationally synthesized the thermoplastic and hydrophilic poly(urethane-acrylate) (HPUA) binder for a type of printable stretchable Ag flakes-HPUA (Ag-HPUA) electrodes in which conductivity can be enhanced by human sweat. In presence sweat, synergistic effect Cl
Soft robots need to be resilient extend their operation under unpredictable environments. While utilizing elastomers that are tough and healable is promising achieve this, mechanical enhancements often lead higher stiffness deteriorates actuation strains. This work introduces liquid metal nanoparticles into carboxyl polyurethane elastomer sensitize a dielectric actuator (DEA) with responsiveness electric fields NIR light. The nanocomposite can healed illumination retain high toughness (55 MJ...
Abstract The tribovoltaic nanogenerator (TVNG), a promising semiconductor energy technology, displays outstanding advantages such as low matching impedance and continuous direct‐current output. However, the lack of controllable stable performance modulation strategies is still major bottleneck that impedes further practical applications TVNG. Herein, by leveraging ferroelectricity‐enhanced mechanism control interfacial band bending, lead‐free perovskite‐based (3,3‐difluorocyclobutylammonium)...
Abstract The widespread adoption of renewable and sustainable elastomers in stretchable electronics has been impeded by challenges their fabrication lacklustre performance. Here, we realize a printed conductor with superior electrical performance synthesizing recyclable vegetable oil polyurethane (VegPU) elastomeric binder developing solution sintering method for composites Ag flakes. impedes the propagation cracks through its porous network, while reaction reduces resistance increment upon...
The environmentally friendly vegetable oil-based waterborne polyurethane–organoclay nanocomposites have been successfully synthesized from castor oil polyols, isophorone diisocyanate and dimethylolpropionic acid.
Abstract Dielectric elastomer actuators (DEAs) have shown great potential in the field of robotics, energy harvesting, or haptics for wearables. However, existing DEA materials typically require prestretching and exhibit time-dependent deformations due to their inherent viscoelastic properties. In this work, we address these issues by designing synthesizing a polyurethane acrylate (PUA) copolymerized with polar crosslinker, polyethylene glycol diacrylate (PEGDA), reduce effects through...
Abstract Enhancing fracture toughness and self‐healing within soft elastomers is crucial to prolonging the operational lifetimes of devices. Herein, it revealed that tuning polymer chain mobilities carboxylated‐functionalized polyurethane through incorporating plasticizers or thermal treatment can enhance these properties. Self‐healing promoted as chains gain greater mobility toward broken interface reassociate their bonds. Raising temperature from 80 120 °C, recovered work increased 2.86...