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Proceedings. 11th International Symposium on Electrets最新文献

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Influence of charging conditions of porous polytetrafluoroethylene (PTFE) film electrets on the permeability of membranes 多孔聚四氟乙烯(PTFE)薄膜驻极体充电条件对膜通透性的影响
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042979
Z. Xia, A. Buchtemann, R. Danz, A. Wedel, J. Jian
{"title":"Influence of charging conditions of porous polytetrafluoroethylene (PTFE) film electrets on the permeability of membranes","authors":"Z. Xia, A. Buchtemann, R. Danz, A. Wedel, J. Jian","doi":"10.1109/ISE.2002.1042979","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042979","url":null,"abstract":"In this paper, the influence of charging conditions on the permeability of porous PTFE membranes is studied by constant voltage corona charging at room and elevated temperatures and by measuring the relative flow rate in water when porous PTFE electret films are used as filter membranes. We found that charging field and charging temperature strongly affect the relative flow rate of water. The structure of porous PTFE, investigated by a scanning electron microscope, is important for understanding the influence of charging conditions on material permeability. The increase of the ratio of bulk charge density to surface charge density of the porous films was performed by thermal treatment during charging. Such porous films may be employed as electret filter membranes for purification of dielectric liquids.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"60 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":"117263397","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: 3
Anomalous currents in highly insulating materials 高绝缘材料中的异常电流
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042957
E. Neagu, J. Marat-Mendes
{"title":"Anomalous currents in highly insulating materials","authors":"E. Neagu, J. Marat-Mendes","doi":"10.1109/ISE.2002.1042957","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042957","url":null,"abstract":"Transient anomalous discharging currents (ADC) in low-density polyethylene (LDPE) have been reported (anomalous currents being currents which flow in a direction opposite to that expected). Transient anomalous charging currents (ACC) have been observed recently for LDPE and polytetrafluoroethylene (Teflon FEP). The paper reports on the ACC and ADC measured in the two materials at various temperatures, field strengths, for nonconditioned and conditioned samples, in a vacuum or ambient air conditions. The ADC is almost the mirror image of the ACC. Three characteristic zones have been identified, which are mainly determined by dielectric polarization, bulk conduction mechanisms, electrode effects and charge diffusion. The measurement of ACC and ADC can be used as a valuable technique for studying the charge transport and trapping mechanisms in correlation with the bulk and electrode effects. The upper limit for the drift mobility for LDPE at 80/spl deg/C and 1.5 MV m/sup -1/ was estimated to be 3.5/spl times/10/sup -13/ m/sup 2/V/sup -1/s/sup -1/ and for Teflon, at 140/spl deg/C and 16 MV m/sup -1/, to be 5.4/spl times/10/sup -16/ m/sup 2/ V/sup -1/ s/sup -1/.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"12 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":"131398686","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
Further applications of dielectric relaxation spectroscopy 介电弛豫光谱的进一步应用
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042988
G. J. Pratt, M.J.A. Smith
{"title":"Further applications of dielectric relaxation spectroscopy","authors":"G. J. Pratt, M.J.A. Smith","doi":"10.1109/ISE.2002.1042988","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042988","url":null,"abstract":"Dielectric spectroscopy is an analytical technique notable for its wide-band capability and sensitivity. It relies on the presence of charge-asymmetric functional groups (dipoles) in the material under investigation. Significantly, the motion induced by an impressed field is not exclusive but depends on the nature of the coupling to neighbouring groups, generating in each dielectric spectrum considerable information concerning both dipolar and non-dipolar segments of polymeric or other molecules. Molecular mobility in polymers is influenced by the presence of low molecular weight additives, crosslinking, branching, inter- and intra-molecular interactions from hydrogen bonds and other sources, co-polymerization, blending, and degradation, and by dielectric inhomogeneities at the boundaries between macroscopic sub-structures. Consequently, dielectric spectroscopy is appropriate for the investigation of phase morphology and miscibility, and for the characterisation of changes induced by irradiation or the presence of additives. The utility of the spectroscopy is enhanced when used in conjunction with complementary analytical techniques.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"284 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":"123791605","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
Effect of strain on charging phenomena of triboelectrification with ice specimens 应变对冰试件摩擦带电现象的影响
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042969
H. Shio
{"title":"Effect of strain on charging phenomena of triboelectrification with ice specimens","authors":"H. Shio","doi":"10.1109/ISE.2002.1042969","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042969","url":null,"abstract":"When a couple of ice specimens was asymmetrically rubbed together, at a beginning of rubbing term a specimen with a hot spot was charged negatively against the other specimen with a cold spot. On more rubbing with their specimens the hot spot strained by friction force get harder spot with polycrystallized face and at the same time electric potential of the specimen with the hot spot changed from negative to positive. On the basis of the above face, the present paper describes results obtained on frictional experiments using a strained specimen and a normal specimen. As a result, it was obtained the conclusions as follows: The more strained specimen, the more a specimen got to charge positively.","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":"126537117","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
Dielectric relaxation in zeolites: theoretical calculation of the ionic dipole re-orientational energy and comparison with TSDC data 沸石中的介电弛豫:离子偶极重定向能的理论计算及与TSDC数据的比较
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042992
G. Maurin, P. Senet, S. Devautour, J.C. Giuntini, F. Henn
{"title":"Dielectric relaxation in zeolites: theoretical calculation of the ionic dipole re-orientational energy and comparison with TSDC data","authors":"G. Maurin, P. Senet, S. Devautour, J.C. Giuntini, F. Henn","doi":"10.1109/ISE.2002.1042992","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042992","url":null,"abstract":"An original approach based on Monte-Carlo simulations is proposed for calculating the potential barriers and the electrical polarization associated to the re-orientational motions of cations into a zeolite lattice. A comparison is made with the experimental data obtained from the Thermally Stimulated Depolarization Current technique. A very good agreement is observed, thus confirming, for the first time, that the dielectric relaxation measured in this type of material is likely to be related to ionic localized hopping.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"11 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":"126373202","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
Electrical conduction of LDPE at moderate fields LDPE在中等电场下的导电性
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042958
R. Neagu, J. Marat-Mendes, E. Neagu
{"title":"Electrical conduction of LDPE at moderate fields","authors":"R. Neagu, J. Marat-Mendes, E. Neagu","doi":"10.1109/ISE.2002.1042958","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042958","url":null,"abstract":"The electrical conduction of LDPE was investigated. Results were obtained using isothermal charging and discharging currents, thermally stimulated charging and discharging current measurements. The conduction process is strongly influenced by the charge stored in the sample. The apparent activation energy W is about 0.70 eV. It changes with the isochronal measuring time and at low fields with temperature. As the applied field or charging time increase the space charge stored in the sample increases and implicitly W decreases. The results for long times (days) attest a new conduction mechanism: the space-charge-controlled conductivity.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"25 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":"121871018","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
Space charge behavior in LDPE and its blend polymers LDPE及其共混聚合物的空间电荷行为
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042966
T. Mizutani, C. Zhang, M. Ishioka
{"title":"Space charge behavior in LDPE and its blend polymers","authors":"T. Mizutani, C. Zhang, M. Ishioka","doi":"10.1109/ISE.2002.1042966","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042966","url":null,"abstract":"The space charge behaviors in LDPE and blend polymers of LDPE and random copolymer of ethylene and propylene (EP) were investigated with the pulsed electro-acoustic (PEA) method. A positive DC voltage was applied to the semiconductive electrode of Al/specimen/semiconductive layer. The blend specimen of 90 wt.% LDPE and 10 wt.% polypropylene copolymer (B10) showed more space charge than pure LDPE (PE) under a DC field of 50 MV m/sup -1/ at both 30 and 60/spl deg/C. Positive space charge moved more slowly in B10 than in PE at 30/spl deg/C. DC current of B10 was less than that of PE at 30/spl deg/C, but higher at 60/spl deg/C. The decay characteristics of space charge after short-circuiting were also investigated. The decay processes for both PE and B10 had two time constants which suggest the existence of two kinds of carrier traps. The activation energy was estimated from the temperature dependence of decay time constant. The activation energy corresponding to trap depth increased by blending polypropylene copolymer with LDPE, suggesting the modification of traps by blending.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"8 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":"123718021","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: 5
The relaxation parameters and their distributions deduced from thermally stimulated discharge current 由热激放电电流推导出弛豫参数及其分布
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042991
R. Neagu, E. Neagu
{"title":"The relaxation parameters and their distributions deduced from thermally stimulated discharge current","authors":"R. Neagu, E. Neagu","doi":"10.1109/ISE.2002.1042991","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042991","url":null,"abstract":"In the analysis of thermally stimulated depolarisation current, the results obtained when it is assumed that only one parameter, either the activation energy W or the pre-exponential factor /spl tau//sub 0/ is variable, are different. The peak position and shape change significantly when, for a simulation, it is assumed that the activation energy is variable and the pre-exponential factor is constant or vice versa. An improved expression for the current is proposed that takes into consideration that W and /spl tau//sub 0/ change simultaneously. The distributions in activation energies and in preexponential factors cannot be determined properly if /spl Delta/W/spl cong/kT/sub m/ and /spl Delta//spl tau//sub 0//spl cong//spl tau//sub 0/, or by assuming only one distribution.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"44 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":"127078392","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
Preparation, characterization and sensor properties of ferroelectric and porous fluoropolymers 铁电和多孔含氟聚合物的制备、表征和传感器性能
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042978
R. Danz, B. Elling, A. Buchtemann, P. Mirow
{"title":"Preparation, characterization and sensor properties of ferroelectric and porous fluoropolymers","authors":"R. Danz, B. Elling, A. Buchtemann, P. Mirow","doi":"10.1109/ISE.2002.1042978","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042978","url":null,"abstract":"Ferroelectric copolymers of vinylidene fluoride and trifluoroethylene [P(VDF/TrFE)] have a strong piezoelectric and pyroelectric effect with a high potential for sensor and transducer applications. Porous polytetrafluoroethylene (PTFE) exhibits excellent electret properties and is suitable for transducer applications based on its macroscopic piezoelectricity. In this work the preparation of piezoelectric P(VDF/TrFE) films onto flexible as well as on any shaped printed circuits achieved through a spray technique from the polymer solution is reported. Results on array sensors, measuring dynamic pressure in air flow field monitoring as well as dynamic force measurements, are presented. Electret transducers made by porous PTFE are prepared and their sensor properties are described.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"282 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":"127479724","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
Dielectric relaxation and resonance spectra of ferroelectric polyamide 11 铁电聚酰胺11的介电弛豫和共振谱
Proceedings. 11th International Symposium on Electrets Pub Date : 2002-12-10 DOI: 10.1109/ISE.2002.1042950
P. Frubing, A. Kremmer, J. Ganster, P. Pissis, R. Gerhard-Multhaupt
{"title":"Dielectric relaxation and resonance spectra of ferroelectric polyamide 11","authors":"P. Frubing, A. Kremmer, J. Ganster, P. Pissis, R. Gerhard-Multhaupt","doi":"10.1109/ISE.2002.1042950","DOIUrl":"https://doi.org/10.1109/ISE.2002.1042950","url":null,"abstract":"Ferroelectric polyamide 11 films were prepared by melt-quenching, cold-drawing and electrical poling. Ferroelectricity was checked by dielectric-hysteresis measurements. Dielectric spectroscopy was applied for determining piezoelectric constants from thickness-extension resonances as well as for investigating conformational changes due to quenching, stretching and electrical poling. A remanent polarisation of up to 35 mC/m/sup 2/, a coercive field of 75 MV/m and a piezoelectric d/sub 33/ coefficient of 2.7 pC/N were obtained. In the ferroelectric film, the dielectric /spl alpha/ relaxation is suppressed whereas the /spl beta/ relaxation is enhanced.","PeriodicalId":331115,"journal":{"name":"Proceedings. 11th International Symposium on Electrets","volume":"30 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":"132229619","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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