The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Fangxiao Guan - One of the best experts on this subject based on the ideXlab platform.
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Crystal Orientation and temperature effects on double hysteresis loop behavior in a poly vinylidene fluoride co trifluoroethylene co chlorotrifluoroethylene graft polystyrene graft copolymer
Macromolecules, 2013Co-Authors: Lianyun Yang, Elshad Allahyarov, Fangxiao GuanAbstract:Recently, double hysteresis loop (DHL) behavior, which is advantageous for the high energy density and low loss dielectric application, was achieved in a poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene)-graft-polystyrene [P(VDF-TrFE-CTFE)-g-PS(14%)] graft copolymer due to the nanoconfinement effect. In this work, we continued to investigate the Crystal Orientation and temperature effects on the DHL behavior of this graft copolymer. Based on the electric displacement–electric field (D–E) study, Crystal Orientation had a profound effect on its electrical behavior. For the nonoriented sample, dielectric instead of ferroelectric behavior was observed. After uniaxial stretching, DHLs gradually developed in the oriented films upon increasing the extension ratio. For a fully stretched film, the DHL behavior was stable below 75 °C but gradually disappeared above 100 °C due to enhanced dc conduction and impurity ion migrational loss at elevated temperatures. After subtracting the dc conduc...
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Crystal Orientation and temperature effects on double hysteresis loop behavior in a poly vinylidene fluoride co trifluoroethylene co chlorotrifluoroethylene graft polystyrene graft copolymer
Macromolecules, 2013Co-Authors: Lianyun Yang, Elshad Allahyarov, Fangxiao GuanAbstract:Recently, double hysteresis loop (DHL) behavior, which is advantageous for the high energy density and low loss dielectric application, was achieved in a poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene)-graft-polystyrene [P(VDF-TrFE-CTFE)-g-PS(14%)] graft copolymer due to the nanoconfinement effect. In this work, we continued to investigate the Crystal Orientation and temperature effects on the DHL behavior of this graft copolymer. Based on the electric displacement–electric field (D–E) study, Crystal Orientation had a profound effect on its electrical behavior. For the nonoriented sample, dielectric instead of ferroelectric behavior was observed. After uniaxial stretching, DHLs gradually developed in the oriented films upon increasing the extension ratio. For a fully stretched film, the DHL behavior was stable below 75 °C but gradually disappeared above 100 °C due to enhanced dc conduction and impurity ion migrational loss at elevated temperatures. After subtracting the dc conduc...
Martin Cada - One of the best experts on this subject based on the ideXlab platform.
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photoanodes with fully controllable texture the enhanced water splitting efficiency of thin hematite films exhibiting solely 110 Crystal Orientation
ACS Nano, 2015Co-Authors: Stepan Kment, Patrik Schmuki, Zdenek Hubicka, Libor Machala, Robin Kirchgeorg, Ning Liu, Lei Wang, Kiyoung Lee, J Olejnicek, Martin CadaAbstract:Hematite, α-Fe2O3, is considered as one of the most promising materials for sustainable hydrogen production via photoelectrochemical water splitting with a theoretical solar-to-hydrogen efficiency of 17%. However, the poor electrical conductivity of hematite is a substantial limitation reducing its efficiency in real experimental conditions. Despite of computing models suggesting that the electrical conductivity is extremely anisotropic, revealing up to 4 orders of magnitude higher electron transport with conduction along the (110) hematite Crystal plane, synthetic approaches allowing the sole growth in that direction have not been reported yet. Here, we present a strategy for controlling the Crystal Orientation of very thin hematite films by adjusting energy of ion flux during advanced pulsed reactive magnetron sputtering technique. The texture and effect of the deposition mode on the film properties were monitored by XRD, conversion electron Mossbauer spectroscopy, XPS, SEM, AFM, PEC water splitting, IP...
Lianyun Yang - One of the best experts on this subject based on the ideXlab platform.
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Crystal Orientation and temperature effects on double hysteresis loop behavior in a poly vinylidene fluoride co trifluoroethylene co chlorotrifluoroethylene graft polystyrene graft copolymer
Macromolecules, 2013Co-Authors: Lianyun Yang, Elshad Allahyarov, Fangxiao GuanAbstract:Recently, double hysteresis loop (DHL) behavior, which is advantageous for the high energy density and low loss dielectric application, was achieved in a poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene)-graft-polystyrene [P(VDF-TrFE-CTFE)-g-PS(14%)] graft copolymer due to the nanoconfinement effect. In this work, we continued to investigate the Crystal Orientation and temperature effects on the DHL behavior of this graft copolymer. Based on the electric displacement–electric field (D–E) study, Crystal Orientation had a profound effect on its electrical behavior. For the nonoriented sample, dielectric instead of ferroelectric behavior was observed. After uniaxial stretching, DHLs gradually developed in the oriented films upon increasing the extension ratio. For a fully stretched film, the DHL behavior was stable below 75 °C but gradually disappeared above 100 °C due to enhanced dc conduction and impurity ion migrational loss at elevated temperatures. After subtracting the dc conduc...
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Crystal Orientation and temperature effects on double hysteresis loop behavior in a poly vinylidene fluoride co trifluoroethylene co chlorotrifluoroethylene graft polystyrene graft copolymer
Macromolecules, 2013Co-Authors: Lianyun Yang, Elshad Allahyarov, Fangxiao GuanAbstract:Recently, double hysteresis loop (DHL) behavior, which is advantageous for the high energy density and low loss dielectric application, was achieved in a poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene)-graft-polystyrene [P(VDF-TrFE-CTFE)-g-PS(14%)] graft copolymer due to the nanoconfinement effect. In this work, we continued to investigate the Crystal Orientation and temperature effects on the DHL behavior of this graft copolymer. Based on the electric displacement–electric field (D–E) study, Crystal Orientation had a profound effect on its electrical behavior. For the nonoriented sample, dielectric instead of ferroelectric behavior was observed. After uniaxial stretching, DHLs gradually developed in the oriented films upon increasing the extension ratio. For a fully stretched film, the DHL behavior was stable below 75 °C but gradually disappeared above 100 °C due to enhanced dc conduction and impurity ion migrational loss at elevated temperatures. After subtracting the dc conduc...
Kenji Uchino - One of the best experts on this subject based on the ideXlab platform.
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Crystal Orientation dependence of piezoelectric properties of lead zirconate titanate near the morphotropic phase boundary
Applied Physics Letters, 1998Co-Authors: Xiaohong Du, Jiehui Zheng, Uma Belegundu, Kenji UchinoAbstract:The piezoelectric and dielectric constants in different Crystal Orientations of the lead zirconate titanate (PZT) have been phenomenologically calculated for the compositions near the morphotropic phase boundary at room temperature. For a tetragonal PZT, the effective piezoelectric constant d33 monotonously decreases as the Crystal cutting angle from the spontaneous polarization direction [001] increases. However, for a rhombohedral PZT, the effective piezoelectric constant d33[001]// along the perovskite [001] direction was found to be much larger than those along the spontaneous polarization direction [111]. This Crystal Orientation-related enhancement is emphasized as the composition approaches the morphotropic phase boundary. This suggests that by adopting the perovskite [001] Orientation with a rhombohedral composition near the morphotropic phase boundary, the piezoelectric constant d33 for PZT can be greatly enhanced.
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Crystal Orientation dependence of piezoelectric properties in lead zirconate titanate theoretical expectation for thin films
Japanese Journal of Applied Physics, 1997Co-Authors: Uma Belegundu, Kenji UchinoAbstract:Crystal Orientation dependence of piezoelectric properties has been calculated phenomenologically for lead zirconate titanate (PZT) in the three-dimensional space. The calculation has been made for tetragonal PZT 40/60 (40% PZ and 60% PT) and rhombohedral PZT 60/40 compositions. The maximum longitudinal piezoelectric constant d33 and electromechanical coupling factor k33 in the rhombohedral composition were found to be at 57? and 51? angles, respectively, canted from the spontaneous polarization direction. This suggests that thin film piezoelectric actuators or sensors should employ a rhombohedral composition with the perovskite [100] epitaxially-oriented configuration.
Sung Chul Kim - One of the best experts on this subject based on the ideXlab platform.
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effects of talc Orientation and non isothermal Crystallization rate on Crystal Orientation of polypropylene in injection molded polypropylene ethylene propylene rubber talc blends
Polymer, 2004Co-Authors: Woo Jin Choi, Sung Chul KimAbstract:The effects of talc Orientation and non-isothermal Crystallization rate on the Crystal Orientation of polypropylene in the injection-molded PP/EPR/Talc blends were studied by using AFM, DSC, SEM and XRD. Polypropylene was transCrystallized on the talc surface and the polypropylene Crystal was oriented perpendicular to the talc surface. Therefore, the Crystal Orientation was affected by the talc Orientation. At the surface of injection-molded specimens, the Crystal Orientation increased with decreasing the molecular weight of EPRs and increasing the talc content. Because talc particles were nearly oriented parallel to the flow direction in the skin layer of the specimens, the Crystal Orientation was amplified by the increased Crystallization rate. The non-isothermal Crystallization behavior of PP/EPR/Talc blends was investigated in terms of the molecular weight of EPRs and the talc content. Non-isothermal Crystallization rate increased with decreasing the molecular weight of EPRs due to the plasticizing effect of EPRs and increasing the content of talc which acts as nucleating agent.