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Proceedings. 11th International Symposium on Electrets最新文献

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Incorporated oriented polar molecules in PMMA polymeric films: characterization by Kelvin probe technique and atomic force microscopy 聚甲基丙烯酸甲酯聚合物薄膜中的定向极性分子:开尔文探针技术和原子力显微镜表征
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1043024
I. Muzikante, D. Cepīte, E. Fonavs, A. Tokmakov, D. Erts, B. Polakov
{"title":"Incorporated oriented polar molecules in PMMA polymeric films: characterization by Kelvin probe technique and atomic force microscopy","authors":"I. Muzikante, D. Cepīte, E. Fonavs, A. Tokmakov, D. Erts, B. Polakov","doi":"10.1109/ISE.2002.1043024","DOIUrl":"https://doi.org/10.1109/ISE.2002.1043024","url":null,"abstract":"Betaine type dipolar molecules have received considerable attention because of their large dipole moments and optical non-linearities. The host-guest systems are chosen. The high-electric field corona poling was used to generate dipole orientation of betaine molecules in polymer matrices. Atomic force microscopy and surface potential studies yield useful information regarding both structural and electronic properties of casted host-guest polymer films. In this work we present results obtained from surface potential and atom force microscopy studies of poled and un-poled thin films on heating.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"188 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":"125842319","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
Complex resistivity of polymer light-emitting diodes 聚合物发光二极管的复电阻率
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1043018
R. Bianchi, L. F. Santos, R. Faria
{"title":"Complex resistivity of polymer light-emitting diodes","authors":"R. Bianchi, L. F. Santos, R. Faria","doi":"10.1109/ISE.2002.1043018","DOIUrl":"https://doi.org/10.1109/ISE.2002.1043018","url":null,"abstract":"Complex resistivity measurements in dark and under vacuum were carried out to study the electrical behavior of luminescent polymer diodes (LEDs) having ITO or gold as hole injector electrodes, aluminium as the cathode, and poly[(2-methoxy-5-hexyloxy)-p-phenylenevinylene] - MH-PPV as the luminescent layer. The results obtained were analysed by a model based on resistor-capacitor circuits, which made possible to distinguish between bulk from interface effects, and the contribution of each phenomenon to the electrical current. It was also shown that bulk properties already exist in a film of 0.4 /spl mu/m thick, and from the theoretical fittings it was obtained the dielectric constant and resistivity of MH-PPV.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"40 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":"122367382","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
Piezoelectricity of 1-3 PZT/epoxy composites 1-3 PZT/环氧复合材料的压电性
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1043007
Y. Phermpornsakul, S. Muensit, I. Guy
{"title":"Piezoelectricity of 1-3 PZT/epoxy composites","authors":"Y. Phermpornsakul, S. Muensit, I. Guy","doi":"10.1109/ISE.2002.1043007","DOIUrl":"https://doi.org/10.1109/ISE.2002.1043007","url":null,"abstract":"The piezoelectric and pyroelectric properties of 1-3 type PZT/epoxy composites have been investigated. These materials have important advantages for a wide range of applications. The piezoelectric strain d coefficient for the poled samples was determined using the interferometric technique. It is found that the d/sub 33/ values are 190 and 188 pm/V for the 0.4 and 0.6 volume fractions of PZT, respectively. The pyroelectric coefficient for samples with 0.4 and 0.6 volume fractions of PZT was measured and compared with that of the PZT. It is found that the coefficients of the composites increased with the ceramic content and reached values as large as 54 /spl mu/C/m/sup 2///spl deg/C. Because these materials have good promise for applications such as pyroelectric detectors, the thermal diffusivity of the composites is also being determined. The data reported in this work might serve as a guide for development of specific applications of the composite.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"128 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":"127966741","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
High gradient fabrics 高梯度织物
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1043003
R. Kacprzyk, B. Lowkis
{"title":"High gradient fabrics","authors":"R. Kacprzyk, B. Lowkis","doi":"10.1109/ISE.2002.1043003","DOIUrl":"https://doi.org/10.1109/ISE.2002.1043003","url":null,"abstract":"The results of potential distribution and its evolution in time for polypropylene-polyamide fabric were presented in the paper. The tribocharged fabrics, made of combined threads, exhibited strong local electric fields (high gradient fabrics). The estimated values of the normal and tangent components of the electric field were estimated to be on the level of 10/sup 6/ V/m or higher. It was shown that the tribocharging process might be used for activation and revitalisation of strong electric fields, appearing on combined fabrics. Obtained values of components of the field suggest the application of the fabrics in the construction of filters with electrically enhanced efficiency.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"37 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":"128726425","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: 6
The use of pulsed electric acoustic technique for measuring electric field profiles in ferroelectric ceramic 利用脉冲电声技术测量铁电陶瓷的电场分布
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1043019
J. Giacometti, J. Eiras, M. Lente, J. Tomioka, C. Wisniewski, W. A. Moura
{"title":"The use of pulsed electric acoustic technique for measuring electric field profiles in ferroelectric ceramic","authors":"J. Giacometti, J. Eiras, M. Lente, J. Tomioka, C. Wisniewski, W. A. Moura","doi":"10.1109/ISE.2002.1043019","DOIUrl":"https://doi.org/10.1109/ISE.2002.1043019","url":null,"abstract":"The pulsed electric acoustic technique, PEA, have been usually applied to probe space charge profiles in polymers. In this work we show preliminary results obtained with lead zirconate-titanate and niobium, PZTN, ferroelectric ceramic samples. Experiments showed that induced charge densities on sample electrodes are mainly due to the ferroelectric polarization of the sample. We present results of the typical PEA response and the procedure to deconvolute the signal in order to obtain the charge densities and the electric field profiles. The PEA setup allows us to show a non-uniform polarization during ferroelectric switching.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"15 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":"116168027","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
Influence of supramolecular architecture upon the molecular mobility of elastin 超分子结构对弹性蛋白分子迁移率的影响
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1043011
V. Samouillan, J. Dandurand, C. Lacabanne, W. Hornebeck
{"title":"Influence of supramolecular architecture upon the molecular mobility of elastin","authors":"V. Samouillan, J. Dandurand, C. Lacabanne, W. Hornebeck","doi":"10.1109/ISE.2002.1043011","DOIUrl":"https://doi.org/10.1109/ISE.2002.1043011","url":null,"abstract":"Mature elastin is a cross-linked polymer responsible for elastic recoil in various connective tissues. The most probable model for the secondary structure seems to be a dynamic blend between a random coil network and an anisotropic model with the alternation of /spl alpha/ helices and recurrent or isolated /spl beta/ turns. We compare the chain dynamics of native elastin purified from bovine neck ligament and its insoluble products obtained from enzymatic digestion. The soluble, uncross-linked derivative is also analysed to obtain new information on the influence of network on elastin molecular mobility. TSC and DDS experiments bring to the fore secondary and main modes for elastin and its derivatives. It has been highlighted that elastolysis and cross-linking do not affect the localised motions, but modify in a significant manner more delocalised motions along the polypeptidic chains.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"20 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":"114639548","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
Electro-physical properties of PTFE/bronze composites 聚四氟乙烯/青铜复合材料的电物理性能
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1043005
E. Motyl, M. Lisowski
{"title":"Electro-physical properties of PTFE/bronze composites","authors":"E. Motyl, M. Lisowski","doi":"10.1109/ISE.2002.1043005","DOIUrl":"https://doi.org/10.1109/ISE.2002.1043005","url":null,"abstract":"Electret state of polymer/metal composite based on polytetrafluoroethylene (PTFE) and bronze powder was investigated. It was found that bronze/PTFE composites have very long lifetime (2 10/sup 12/s) of charge stored in the bulk, which is of the same order of magnitude as the most stable polymeric electrets.","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":"126660391","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
Charge transport in silicon nitride/silicon oxide double layers 氮化硅/氧化硅双层中的电荷输运
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042959
X. Zhang, G. Sessler
{"title":"Charge transport in silicon nitride/silicon oxide double layers","authors":"X. Zhang, G. Sessler","doi":"10.1109/ISE.2002.1042959","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042959","url":null,"abstract":"Charge transport was studied in double layers of 150 nm silicon nitride and 300 nm silicon oxide on silicon substrate by determining the location of the charge centroid (mean charge depth) with a new method based on the evaluation of capacitance-voltage data in conjunction with surface potential measurements. The samples were charged at room temperature on their open nitride surface to potentials of about 100 V with a corona process. Measurements of the location of the charge centroid were performed after annealing periods at temperatures up to 600/spl deg/C. The results show that positive charge is relatively immobile at the nitride surface at temperatures up to 200/spl deg/C; at 400/spl deg/C, it drifts through the nitride within hours to be trapped at the nitride/oxide interface. The charge is released from these traps at about 500/spl deg/C when it drifts to the substrate. Negative charge is also immobile at 200/spl deg/C but drifts at 400/spl deg/C through the entire double layer.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"24 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":"127093782","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: 4
Stable and metastable ferroelectric polarization analyzed by the ramp voltage technique 用斜坡电压技术分析稳定和亚稳态铁电极化
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042982
C. Wisniewski, G. F. Leal Ferreira, R. Faria, J. Giacometti
{"title":"Stable and metastable ferroelectric polarization analyzed by the ramp voltage technique","authors":"C. Wisniewski, G. F. Leal Ferreira, R. Faria, J. Giacometti","doi":"10.1109/ISE.2002.1042982","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042982","url":null,"abstract":"The study of the stable and the metastable ferroelectric polarization of poly(vinylidene fluoride), PVDF, was performed using two successive equal sign ramp voltages, mediated by a short-circuit period. Rates from 10 V/s up to 0.7 MV/s were used. Results showed that they follow different formation kinetics; that the stable part decreases for higher ramp voltage rates and its apparent coercive field increases.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"1 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":"131353677","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
Frictional electrification of Langmuir-Blodgett layers and dipole moment of constituent molecules of Langmuir layers Langmuir- blodgett层的摩擦电化和Langmuir层组成分子的偶极矩
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1043006
K. Ohara, T. Hirai, K. Amano, I. Nakamura
{"title":"Frictional electrification of Langmuir-Blodgett layers and dipole moment of constituent molecules of Langmuir layers","authors":"K. Ohara, T. Hirai, K. Amano, I. Nakamura","doi":"10.1109/ISE.2002.1043006","DOIUrl":"https://doi.org/10.1109/ISE.2002.1043006","url":null,"abstract":"Triboelectrification of Langmuir-Blodgett films, which consist of various molecules with -CH/sub 2/NH/sub 2/, -COOCH/sub 3/, -CONH/sub 2/, -CH/sub 2/OH, -COOH and -CONHC/sub 6/H/sub 5/ bonded to -(CH2)/sub 16/CH/sub 3/ linear hydrocarbon chains, was investigated to make clear the influence of polar atomic groups on the contact or triboelectrification. Further, local electric dipole moment of each polar group was determined by measuring displacement currents generated by compressing monolayers on the water surface at 283K. The triboelectric series obtained from the frictional electrification between monolayers and glass by taking the polarity and magnitude was as follows: (+) -CH/sub 2/NH/sub 2/, -CH/sub 2/OH, -COOH, -CONHC/sub 6/H/sub 5/, Glass, -CONH/sub 2/, -COOCH/sub 3/ (-). The local dipole moments of atomic groups were 0.30, 0.26, 0.01, -0.20, (Glass), 0.17 and 0.34D in the order of material in the triboelectric series, respectively. The order of magnitude of dipole moment seems to correspond to the triboelectric series of atomic groups. This shows that the electron density on atomic groups affects the frictional electrification.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"81 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":"116682116","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
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