A5033653505- Dielectric materials and actuators
- Advanced Sensor and Energy Harvesting Materials
- Ferroelectric and Piezoelectric Materials
- Conducting polymers and applications
- Electromagnetic wave absorption materials
- Analytical chemistry methods development
- Silicone and Siloxane Chemistry
- Polymer Nanocomposites and Properties
- Multiferroics and related materials
- Fuel Cells and Related Materials
- Tactile and Sensory Interactions
- Gas Sensing Nanomaterials and Sensors
- Material Properties and Applications
- Analytical Chemistry and Sensors
- Inorganic Fluorides and Related Compounds
- Muscle activation and electromyography studies
- Micro and Nano Robotics
- Mercury impact and mitigation studies
- Acoustic Wave Resonator Technologies
- Metal-Organic Frameworks: Synthesis and Applications
- Organometallic Complex Synthesis and Catalysis
- Water Treatment and Disinfection
- High voltage insulation and dielectric phenomena
- Advanced Materials and Mechanics
- Carbon dioxide utilization in catalysis
Pennsylvania State University
2019-2025
Park University
2020
Sun Yat-sen University
2014-2017
Abstract Modern electronics and electrical systems demand efficient operation of dielectric polymer‐based capacitors at high electric fields elevated temperatures. Here, polyimide (PI) composites prepared from in situ polymerization the presence inorganic nanofillers are reported. The systematic manipulation constant bandgap fillers, including Al 2 O 3 , HfO TiO boron nitride nanosheets, reveals dominant role fillers determining improving high‐temperature capacitive performance polymer...
Next-generation microelectronics and electrical power systems call for high-energy-density dielectric polymeric materials that can operate efficiently under elevated temperatures. However, the currently available polymer dielectrics are limited to relatively low working Here, solution-processable nanocomposites consisting of readily prepared Al2 O3 fillers with systematically varied morphologies including nanoparticles, nanowires, nanoplates reported. The field-dependent conduction at...
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...
Superior high-temperature discharged energy densities in comparison to those of the current dielectric polymers have been demonstrated crosslinked fluoropolymers.
Abstract The exploration of high‐energy‐density electrostatic capacitors capable operating both efficiently and reliably at elevated temperatures is great significance in order to meet advanced power electronic applications. energy density a capacitor strongly dependent on dielectric constant breakdown strength material. Here, we demonstrate class solution‐processable polymer nanocomposites exhibiting concurrent improvement strength, which typically show negative correlation conventional...
Dielectric polymer nanocomposites with ultralow content of nanofillers exhibit remarkable enhancements in dielectric constant and breakdown strength, yielding high discharged energy densities efficiencies.
Polymer dielectrics-based capacitors are indispensable to the development of increasingly complex, miniaturized and sustainable electronics electrical systems. However, current polymer dielectrics limited by their relatively low discharged energy density, efficiency poor high-temperature performance. Here, we review recent advances in high-performance composite for capacitive storage applications at both ambient elevated temperature (≥ 150°C). We highlight underlying rationale behind...
As the most intensively investigated ferroelectric polymers, poly(vinylidene fluoride) and its co-/ter-polymers enable major breakthroughs in a wide range of applications. Since defects play vital role tuning spectrum physical properties fluoride)-based defect engineering has become an ingenious robust strategy design high-performance polymers. In this Review, we summarize insights into induced by various monomers at molecular level on structure–property relationship defect-modified We focus...
Polymer composite dielectrics have been actively developed for electrical power and electronic applications. The latest advances in dielectric polymer composites with ultralow (<1 vol. %) filler loadings overcome many of the significant drawbacks composites. Such now offer opportunities gleaning insights into impact interfaces on behaviors developing mathematical theories models interface contributions. In this Perspective, we review key developments contents small-sized fillers. We...
Ferroelectric polymers for energy storage and conversions suffer from high losses. Despite great efforts in polymer composites with organic or inorganic fillers, limited successes are achieved an often compromised dielectric constant (K). Here, a synthesized organic-inorganic hybrid-perfluorinated polyhedral oligomeric silsesquioxane (F-POSS) is presented creating ultralow-loss ferroelectric composite. The incorporation of such perfluorinated organosilicons unique "cage-arm" structure into...
The incorporation of comonomers as structural defects has been extensively exploited to modulate the structures and physical properties poly(vinylidene fluoride) (PVDF)-based ferroelectric polymers. Previous studies have shown that large-sized can induce relaxor ferroelectricity in PVDF-based terpolymers a result stabilization helical conformation. Here, we show that, with incorporating small-sized defect, vinyl fluoride (VF), into copolymer, resulting preferentially adopt polar all-trans...
The discovery of relaxor behavior in poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] copolymers plays a crucial role driving the formation morphotropic phase boundary (MPB) near which large enhancements dielectric and piezoelectric responses are achieved. Here we study spectra P(VDF-TrFE)s MPB analyze using two different theoretical models. We observe largest constant ∼76 at 1 kHz composition P(VDF-TrFE) 50/50 mol % around 69 °C. show that compositional dependence peak temperature...
Significantly enhanced electromechanical responses are inherent to piezoelectric materials at the morphotropic phase boundary (MPB). Here we reveal that conformational competition between trans-planar and 3/1-helical phases of poly(vinylidene fluoride–trifluoroethylene) P(VDF-TrFE) occurs intramolecularly rather than intermolecularly induce formation MPB. We attribute significantly properties observed near MPB polarization rotation energetically degenerate phases. Our results offer design...
Abstract Hysteresis phenomena, including both electrical and thermal types, are essential to ferroelectric materials. The former, known as polarization‐electric field hysteresis, has been intensively studied in a wide range of However, relevant experimental evidence on hysteresis remains limited, especially polymers, even though is crucial the caloric effect, which usually largest near phase transition. Here, behavior polymers terms temperature‐dependent polarization upon heating cooling. In...
Piezoelectric polymers are attractive as next-generation flexible, wearable, and implantable electronic materials for energy, sensor, medical applications. Here, we report the enhancement of longitudinal piezoelectric coefficients (d33) poly(vinylidene fluoride) (PVDF)-based ferroelectric via synthesis characterization difluoride-co-trifluoroethylene-co-chlorotrifluoroethylene) [P(VDF-TrFE-CTFE)] terpolymers with coexisting mixed normal relaxor phases. Specifically, terpolymer a composition...
The incorporation of bulky defects into ferroelectric poly(vinylidene fluoride-trifluoroethylene) copolymers can result in a relaxor behavior, accompanied by outstanding electrocaloric properties near room temperature. However, it remains elusive whether transition occurs terpolymers, which is critical for the design cooling devices. In this work, we study fatigue fluoride-trifluoroethylene-chlorofluoroethylene) (61.8/30.4/7.8 mol. %) terpolymer, revisit its controversial issue phase...
A family of poly(vinylidene fluoride-ter-trifluoroethylene-ter-chlorodifluoroethylene) [P(VDF-TrFE-CDFE)] terpolymers was synthesized. The effect the chlorodifluoroethylene (CDFE) concentration on microstructures and ferroelectric properties terpolymer has been systematically investigated. It is found that P(VDF-TrFE-CDFE) can be gradually converted from a normal into relaxor with increase CDFE content 0.7 to 4.5 mol %. Fourier-transform infrared spectroscopy wide-angle X-ray diffraction...