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Proceedings. 11th International Symposium on Electrets最新文献

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Changes of space charge profiles in PET electrets after thermally stimulated discharges 热激放电后PET驻极体空间电荷分布的变化
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042989
E. Motyl
{"title":"Changes of space charge profiles in PET electrets after thermally stimulated discharges","authors":"E. Motyl","doi":"10.1109/ISE.2002.1042989","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042989","url":null,"abstract":"Behaviour of electric charges in a PET film has been investigated under the condition of partial discharging at higher annealing temperatures. The PET electrets corona-charged at room temperature and 440 K were investigated. The step electroacoustic method was used for the measurement of the space charge distributions along the sample thickness. The highest surface charge densities, and charge stability were obtained after negative corona charging at 440 K.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133614569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Structural and property changes of high energy proton-irradiated poly(vinylidene fluoride-trifluoroethylene) 56/44 mol.% copolymer 高能质子辐照聚偏氟乙烯-三氟乙烯56/44 mol.%共聚物的结构和性能变化
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042954
S. T. Lau, H. Chan, B. Sundaravel, I. Wilson, C. Choy
{"title":"Structural and property changes of high energy proton-irradiated poly(vinylidene fluoride-trifluoroethylene) 56/44 mol.% copolymer","authors":"S. T. Lau, H. Chan, B. Sundaravel, I. Wilson, C. Choy","doi":"10.1109/ISE.2002.1042954","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042954","url":null,"abstract":"High-energy proton irradiation with a broad range of dosages has been carried out to investigate the potential for modifying the properties of poly(vinylidene fluoride-trifluoroethylene) 56/44 mol.% copolymer films. The relative permittivity, polarization hysteresis, electric field induced strain, lattice spacing and phase transition behavior of the irradiated copolymer films were studied. With regards to the dielectric and polarization behaviors, the copolymer film can be converted from a typical ferroelectric to a relaxor ferroelectric upon irradiation. This implies that the high-energy protons can break up the coherent polarization domains in the normal ferroelectric copolymer into nano-sized regions. Besides, the XRD data showed that the solid-state phase transition from the polar phase to nonpolar phase is induced in the copolymer during irradiation in which the lattice spacing increases significantly. The electric field induced phase transformation of the nano-sized regions between the polar and nonpolar phase leads to a high electrostrictive strain observed in the irradiated copolymers.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132868718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Dielectric properties of proteins encapsulated in silica gel 包裹在硅胶中的蛋白质介电特性
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042994
M. G. Bridelli, R. Capelletti, C. Mora, L. Pirola, L. Ronda
{"title":"Dielectric properties of proteins encapsulated in silica gel","authors":"M. G. Bridelli, R. Capelletti, C. Mora, L. Pirola, L. Ronda","doi":"10.1109/ISE.2002.1042994","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042994","url":null,"abstract":"The study of the interactions between a silicate gel matrix and proteins encapsulated in such porous materials may help to get further insight on the distribution of water molecules around biological macromolecules experiencing a quasi-physiological environments. In the present paper the Thermally Stimulated Depolarization Currents (TSDC) spectra of tetramethoxysilane based silica gel at different hydration degrees (h=25 to 0. 15 g/sub water//g/sub dry material/) have been monitored in the range 100-300 K, then analyzed and compared with those recorded for myoglobin, lysozyme and lipase embedded in the same matrix. The results obtained allow to identify up to three energetically distinct families of water molecules trapped in the gel network and, in the spectra of encapsulated proteins, to distinguish the contributions coming from the protein aqueous microenvironment and from the water dipoles directly related to the included protein structure.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126955495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Characterization of surface dead layer in VCF/TrFE nano films by means of broadband dielectric spectroscopy 宽带介电光谱法表征VCF/TrFE纳米膜表面死层
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042953
A. Kitahama, Y. Takahashi, T. Furukawa
{"title":"Characterization of surface dead layer in VCF/TrFE nano films by means of broadband dielectric spectroscopy","authors":"A. Kitahama, Y. Takahashi, T. Furukawa","doi":"10.1109/ISE.2002.1042953","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042953","url":null,"abstract":"The dielectric properties of thin films of copolymers of vinylidene fluoride with trifluoroethylene were examined. With assuming a layer at the surface that shows no ferroelectricity, the thickness dependence of the dielectric properties was analyzed. The temperature dispersion of the dielectric permittivity of the surface layer was estimated as well as its thickness. It was shown that the surface layer shows a small relaxation at the same temperature as that of the molecular motion in the bulk amorphous region, while the molecular motion is rather limited in the surface layer.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115187767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Piezoelectricity of cellular and porous polymer electrets 多孔和多孔聚合物驻极体的压电性
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042940
J. Hillenbrand, Zhongfu Xia, Xiaoqing Zhang, G. M. Sessler
{"title":"Piezoelectricity of cellular and porous polymer electrets","authors":"J. Hillenbrand, Zhongfu Xia, Xiaoqing Zhang, G. M. Sessler","doi":"10.1109/ISE.2002.1042940","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042940","url":null,"abstract":"A number of experiments were conducted to further investigate the piezoelectric properties of cellular and porous electrets. The samples studied were films of cellular polypropylene (PP) and of porous polytetrafluoroethylene (PTFE), with thicknesses between 50 and 100 /spl mu/m. In some cases, multilayers consisting of one of these polymers plus an additional air or solid layer were also investigated. Results show that single layers of cellular PP, metalized on both sides, have piezoelectric d/sub 33/-constants of up to 350 pC/N while such samples of porous PTFE have much lower constants. Multilayers consisting of one cellular or porous layer plus an air layer exhibit significantly larger constants, exceeding 20,000 pC/N, due to the softness of the air. While the d/sub 33/-constant of the multilayer systems decreases with load due to the compression of the softer layer, cellular PP shows fairly constant d/sub 33/ values for static pressures of up to 10 kPa thus indicating a rather large linear regime of the nonlinear stress-strain relationship. In this static pressure range a linear frequency response of the cellular foils was found if the foils were unstretched or under constant stress during the measurement. Stretching of the cellular PP foils results in a significant increase of the d/sub 33/-constants and thus represents an optimization method for the piezoelectric activity.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115445982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 25
Bound water in biopolymers: possible role in polarization storage 生物聚合物中的结合水:在极化储存中的可能作用
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1043032
R. Nath
{"title":"Bound water in biopolymers: possible role in polarization storage","authors":"R. Nath","doi":"10.1109/ISE.2002.1043032","DOIUrl":"https://doi.org/10.1109/ISE.2002.1043032","url":null,"abstract":"Water inside living cell fluctuates between phases of disordered liquid and ordered solid determined by polymerization and the bound water in biopolymers is considered to be of fundamental physical and biological importance. Charge storage in biopolymers i.e. the bioelectret state has been demonstrated in a variety of biomolecules e.g. amino acid derivatives, proteins, polypeptides, benzene derivatives, aromatic polyimides etc. and a number of methods have been used for these studies. In the present paper results of our studies on the charge storage or bioelectret state in diastase an enzyme, dextrin a polysaccharide and folic acid - a vitamin using TSDC technique will be examined considering the effect of hydration on TSDC peaks for the role of bound water in polarization storage. All the biopolymers studied here have been found to store a large amount of polarization through bound water present in three different states (i) the structured water strongly bound on the back bound of the biopolymer (ii) the multiple hydrogen bonded intermediate bound water and (iii) the weakly bound water absorbed on the surface of the biopolymer. Further studies on a variety of biopolymers may establish the role of bound water in bioelectret state.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116077738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
A comparative study of dielectric properties of As/sub 2/Se/sub 3/ and As/sub 2/Se/sub 3/Bi/sub x/ glassy systems As/sub - 2/Se/sub - 3/和As/sub - 2/Se/sub - 3/Bi/sub - x/玻璃系介电性能的比较研究
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042964
G. Bordovsky, V.A. Bordovsky, R. Castro
{"title":"A comparative study of dielectric properties of As/sub 2/Se/sub 3/ and As/sub 2/Se/sub 3/Bi/sub x/ glassy systems","authors":"G. Bordovsky, V.A. Bordovsky, R. Castro","doi":"10.1109/ISE.2002.1042964","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042964","url":null,"abstract":"We report about the peculiarities of the dielectric properties of a-As/sub 2/Se/sub 3/ and As/sub 2/Se/sub 3/Bi/sub x/ (x=20 at.%) layers. The As/sub 2/Se/sub 3/ layers are characterized by gradual decrease of /spl epsiv/ with frequency and increase with temperature. A broad maximum is registered on tg/spl delta/-f dependence. At low frequencies f<10/sup -1/ Hz the loss factor increases with temperature. For modified system As/sub 2/Se/sub 3/Bi/sub x/ much greater decrease of /spl epsi/ with frequency and increase with temperature is found. tg/spl delta/-f dependence of this system demonstrates no maximum and at frequencies f<10/sup -1/ Hz the loss factor decreases with temperature. The mentioned above results confirm the assumption that the metal dopants act as positively charge impurities.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125242653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Pressure induced piezoelectric /spl beta/-phase crystallization in screen printed polymer thick films 丝网印刷聚合物厚膜中压力诱导压电/spl β /相结晶
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1043029
K. Arshak, C. Ryan, M. Campion
{"title":"Pressure induced piezoelectric /spl beta/-phase crystallization in screen printed polymer thick films","authors":"K. Arshak, C. Ryan, M. Campion","doi":"10.1109/ISE.2002.1043029","DOIUrl":"https://doi.org/10.1109/ISE.2002.1043029","url":null,"abstract":"In this work, a novel method of producing thick film piezoelectric polymer film has been used based on the use of pressure during crystallisation. This method induces the desired piezoelectric /spl beta/-phase in Polyvinylidene Fluoride (PVDF). The screen printing technique was used to fabricate the films on 96% alumina substrates. Various characteristics have been studied, including the thermal and structural properties of the polymeric films.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126330585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Effect of solvent evaporation rate on thermally stimulated current spectra of solution-cast PMMA films 溶剂蒸发速率对溶液铸造PMMA薄膜热激电流谱的影响
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042968
K. Sakai, K. Ikezaki
{"title":"Effect of solvent evaporation rate on thermally stimulated current spectra of solution-cast PMMA films","authors":"K. Sakai, K. Ikezaki","doi":"10.1109/ISE.2002.1042968","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042968","url":null,"abstract":"Thermally stimulated current (TSC) spectra, isothermal surface potential decay (ITSPD) and morphology were examined for polymethylmethacrylate (PMMA) films cast from an acetonic PMMA solution at variously controlled evaporation rates of the solvent. Observed TSC spectra, ITSPD and morphology for these films remarkably depended on the solvent evaporation rate. At high evaporation rates, charge retention power of these films was large and their appearance became white and cloudy. Fine cellular structure of about 300 /spl mu/m formed by Benard convection was also found in the films cast at high evaporation rates. Deep charge traps were found in the central parts of the Benard convection cells by a charge-visualization technique with fine dye particles. While, at low evaporation rates, charge decay in the PMMA cast films was fast and the films were transparent in their appearance. Annealing the cloudy PMMA films at 130/spl deg/C for 1 hour destructed their cellular structure and made them transparent.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125366453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An integrated view of applications of electret technology in energy and health sectors 驻极体技术在能源和卫生部门应用的综合观点
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042972
M. Goel
{"title":"An integrated view of applications of electret technology in energy and health sectors","authors":"M. Goel","doi":"10.1109/ISE.2002.1042972","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042972","url":null,"abstract":"Electrets are truly a low energy device. Use of electrets; in electronic devices such as sensors, actuators and transducers save considerable energy. Electret integrated devices and smart materials are developing in hybrid form with silicon as next generation microelectromechanical systems. Recent advances in electret technology offer promise to serve mankind through medical prosthesis and by performing other biological functions. In this article, we present an integrated view of electret applications in energy and health sectors.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114427803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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