Dr. Cheng Huang Profile

Dr. Cheng Huang

Research Assistant at Pennsylvania State Univ

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Publications (5)

Proceedings Article | 29 July 2004 Paper

Electroactive polymer (EAP)-based deformable micromirrors and light-valve technology for MOEMS display and imaging systems

Cheng Huang, Qiming Zhang

Proceedings Volume 5389, (2004) https://doi.org/10.1117/12.540191

KEYWORDS: Polymers, Electroactive polymers, Micromirrors, Electrodes, Dielectrics, Mirrors, Light valves, Digital micromirror devices, Adaptive optics, Microelectromechanical systems

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Proceedings Article | 27 July 2004 Paper

High-dielectric-constant polymers as high-energy-density (HED) field effect actuator and capacitor materials

Cheng Huang, Qiming Zhang

Proceedings Volume 5385, (2004) https://doi.org/10.1117/12.540008

KEYWORDS: Dielectrics, Composites, Polymers, Capacitors, Crystals, Electroactive polymers, Actuators, Dielectric polarization, Particles, Data analysis

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The development of high dielectric constant polymers as active materials in high-performance devices is one of the challenges in polymeric electronics and opto-electronics such as flexible thin-film capacitors, memory devices and microactuators for deformable micromirror technology. A group of poly(vinylidene fluoridetrifluoroethylene) P(VDF-TrFE) based high-dielectric-constant fluoroterpolymers have been developed, which have high room-temperature dielectric constant (K>60) and very high strain level and high energy density. The longitudinal and transverse strain of these materials can reach about -7% and 4.5%, respectively, and the elastic energy density is around 1.1 J/cm^3 under a high electric field of 150 MV/m. The influence on the electromechanical properties of copolymerizing poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE) with a third monomer, chlorofluoroethylene (CFE), was investigated. It was found that increasing the CFE content from 0 to 8.5% slowly converts the ferroelectric structure of the copolymer to a relaxor ferroelectric system. This allows for a greatly decreased polarization and dielectric hysteresis and a much higher strain. Above 8.5%, increased CFE content substantially degrades the bulk crystallinity and the Young's modulus. These terpolymers have the potential to achieve above 10 J/cm^3 whole capacity energy density, which makes them good candidates for applications in pulse power capacitors. An all-polymer percolative composite by the combination of conductive polyaniline particles (K>10^5) within a fluoroterpolymer matrix, is introduced which exhibits very high dielectric constant (>7,000). The experimental results show that the dielectric behavior of this new class of percolative composites follows the prediction of the percolation theory and the analysis of the conductive percolation phenomena. The very high dielectric constant of the all-polymer composites which are also very flexible and possess elastic modulus not very much different from that of the insulation polymer matrix makes it possible to induce a high electromechanical response under a much reduced electric field (a strain of 2.65% with an elastic energy density of 0.18 J/cm^3 can be achieved under a low field of 16 MV/m). Data analysis also suggests that in these composites, the non-uniform local field distribution as well as interface effects can significantly enhance the strain responses. Furthermore, the experimental data as well as the data analysis indicate that the conduction loss in these composites will not affect the strain hysteresis. Flexible high dielectric constant electroactive polymers provide potential applications in high-energy-density (HED) energy storage and conversion systems such as lightweight field effect actuators and capacitors.

Proceedings Article | 28 July 2003 Paper

Poly(vinylidene-fluoride-trifluoroethylene) based high-performance electroactive polymers

Feng Xia, Hengfeng Li, Cheng Huang, M. Y. M. Huang, H. Xu, Francois Bauer, Zhong-Yang Cheng, Qi Ming Zhang

Proceedings Volume 5051, (2003) https://doi.org/10.1117/12.484308

KEYWORDS: Polymers, Dielectrics, Composites, Electroactive polymers, Crystals, Solids, Electrostriction, Temperature metrology, Polarization, Actuators

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Proceedings Article | 28 July 2003 Paper

Electromechanical response in liquid crystal gels and networks

Cheng Huang, Qi Ming Zhang, Antal Jakli

Proceedings Volume 5051, (2003) https://doi.org/10.1117/12.484376

KEYWORDS: Liquid crystals, Anisotropy, Dielectrics, Molecules, Polymers, Photopolymerization, Solids, Copper, Chlorine, Crystals

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Proceedings Article | 11 July 2002 Paper

Electromechanical properties and molecular conformation in P(VDF-TrFE)-based terpolymer

Zhong-Yang Cheng, Hengfeng Li, Feng Xia, Haisheng Xu, Dana Olson, Cheng Huang, Qi Ming Zhang, G. Kavarnos

Proceedings Volume 4695, (2002) https://doi.org/10.1117/12.475162

KEYWORDS: Polymers, Ferroelectric polymers, Crystals, Dielectrics, Polarization, FT-IR spectroscopy, Dielectric polarization, X-ray diffraction, Temperature metrology, Picosecond phenomena

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