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Enhanced surface-insulating performance of EP composites by doping plasmafluorinated ZnO nanofiller
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作者 段祺君 宋岩泽 +3 位作者 邵帅 尹国华 阮浩鸥 谢庆 《Plasma Science and Technology》 SCIE EI CAS CSCD 2023年第10期37-48,共12页
The surface flashover of epoxy resin(EP) composites is a pivotal problem in the field of highvoltage insulation.The regulation of the interface between the filler and matrix is an effective means to suppress flashover... The surface flashover of epoxy resin(EP) composites is a pivotal problem in the field of highvoltage insulation.The regulation of the interface between the filler and matrix is an effective means to suppress flashover.In this work,nano ZnO was fluorinated and grafted using lowtemperature plasma technology,and the fluorinated filler was doped into EP to study the DC surface flashover performance of the composite.The results show that plasma fluorination can effectively inhibit the agglomeration by grafting –CFxgroups onto the surface of nano-ZnO particles.The fluorine-containing groups at the interface provide higher charge binding traps and enhance the insulation strength at the interface.At the same time,the interface bond cooperation caused by plasma treatment also promoted the accelerating effect of nano ZnO on charge dissipation.The two effects synergistically improve the surface flashover performance of epoxy composites.When the concentration of fluorinated ZnO filler is 20%,the flashover voltage has the highest increase,which is 31.52% higher than that of pure EP.In addition,fluorinated ZnO can effectively reduce the dielectric constant and dielectric loss of epoxy composites.The interface interaction mechanism was further analyzed using molecular dynamics simulation and density functional theory simulation. 展开更多
关键词 plasma fluorination ZnO nanofller epoxy resin surface flashover charge trap density functional theory(Some figures may appear in colour only in the online journal)
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Impact of coupling geometry on thermoelectric properties of oligophenyl-base transistor
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作者 S Ramezani Akbarabadi H Rahimpour Soleimanit +1 位作者 M Bagheri Tagani Z Golsanamlou 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第2期420-427,共8页
Thermal and electron transport through organic molecules attached to three-dimensional gold electrodes in two different configurations, namely para and meta with thiol-terminated junctions is studied theoretically in ... Thermal and electron transport through organic molecules attached to three-dimensional gold electrodes in two different configurations, namely para and meta with thiol-terminated junctions is studied theoretically in the linear response regime using Green's function formalism. We used thiol-terminated(–SH bond) benzene units and found a positive thermopower because the highest occupied molecular orbital(HOMO) is near the Fermi energy level. We investigated the influence of molecular length and molecular junction geometry on the thermoelectric properties. Our results show that the thermoelectric properties are highly sensitive to the coupling geometry and the molecular length. In addition, we observed that the interference effects and increasing molecular length can increase the thermoelectric efficiency of device in a specific configuration. 展开更多
关键词 coupling geometry figure of merit Green's function oligophenyl thermopower
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The calcium-dependent kinase OsCPK24 functions in cold stress responses in rice 被引量:19
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作者 Yu Liu Chunjue Xu +5 位作者 Yanfen Zhu Lina Zhang Taiyu Chen Fei Zhou Hao Chen Yongjun Lin 《Journal of Integrative Plant Biology》 SCIE CAS CSCD 2018年第2期173-188,共16页
Calcium-dependent protein kinases(CPKs)are serine/threonine protein kinases that function in plant stress responses. Although CPKs are recognized as key messengers in signal transduction, the specific roles of CPKs ... Calcium-dependent protein kinases(CPKs)are serine/threonine protein kinases that function in plant stress responses. Although CPKs are recognized as key messengers in signal transduction, the specific roles of CPKs and the molecular mechanisms underlying their activity remain largely unknown. Here, we characterized the function of Os CPK_(24), a cytosol-localized calciumdependent protein kinase in rice. Os CPK_(24) was universally and highly expressed in rice plants and was induced by cold treatment. Whereas Os CPK_(24) knockdown plants exhibited increased sensitivity to cold compared to wild type(WT), Os CPK_(24)-overexpressing plants exhibited increased cold tolerance. Plants overexpressing Os CPK_(24) exhibited increased accumulation of proline(an osmoprotectant) and glutathione(an antioxidant) and maintained a higher GSH/GSSG(reduced glutathione to oxidized glutathione) ratio during cold stress compared to WT. In addition to these effects in response to cold stress, we observed the kinase activity of Os CPK_(24) varied under different calcium concentrations. Further,Os CPK_(24) phosphorylated Os Grx_(10), a glutathionedependent thioltransferase, at rates modulated by changes in calcium concentration. Together, our results support the hypothesis that Os CPK_(24) functions as a positive regulator of cold stress tolerance in rice, a process mediated by calcium signaling and involving phosphorylation and the inhibition of Os Grx_(10) to sustain higher glutathione levels. 展开更多
关键词 CPK figure The calcium-dependent kinase OsCPK24 functions in cold stress responses in rice
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