2005 12th International Symposium on Electrets最新文献_第4页

Synthesis and optical properties of azo-substituted polythiophene 偶氮取代聚噻吩的合成及其光学性质

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612440

V. C. Gonçalves, D. Balogh

引用次数: 0

Surface morphology, optical and electrical characterization of poly (p-phenylenevinylene) multilayer films 聚对苯乙烯多层膜的表面形貌、光学和电学特性

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612441

M. L. Vega, H. Libardi, R. Faria

{"title":"Surface morphology, optical and electrical characterization of poly (p-phenylenevinylene) multilayer films","authors":"M. L. Vega, H. Libardi, R. Faria","doi":"10.1109/ISE.2005.1612441","DOIUrl":"https://doi.org/10.1109/ISE.2005.1612441","url":null,"abstract":"In this work we report the topology characterization of poly(p-phenylenevinylene) - PPV multilayer films using statistical analysis of atomic force microscopy (AFM) images. PPV spin-coating multilayers were deposited on glass covered with indium thin oxide (ITO) anode using the precursor polymer route thermal converted at 200 /spl deg/C and under vacuum. On the top of the PPV films, aluminum thin film was evaporated and used as cathode to obtain a typical polymer light emitting diode structure. The AFM images were used to analyze the height distribution; the results show clearly the interaction with the substrate for low number of layers. In the case of thick films (5 layers) the polymer surface is more close to a random surface, indicating the loose of the interaction with the substrate. The physical parameters that characterizes the quality of the polymer diode, where also analyzed. The current vs. voltage curves display an increase in the operating voltage with the increment of the polymer layers. However, the probability of short curt decrease substantially for thick devices. The photoluminescence spectra present a decrease in the vibronic region associated with film disorder and/or intrinsic structural defects. The mean conjugation length seams to be similar for all thickness.","PeriodicalId":364651,"journal":{"name":"2005 12th International Symposium on Electrets","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125665454","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

Electromechanics of organic Schottky like contacts, in between piezoelectricity and electrostriction 有机类肖特基接触的电力学，介于压电和电伸缩之间

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612351

R. Schwodiauer, S. Bauer, G. Dennler, C. Lungenschmied, N. Sariciftci, H. Reiss

引用次数: 0

Immobilization of polyphenol oxidase on polypyrrole films for application in biosensors 聚吡咯膜固定化多酚氧化酶在生物传感器中的应用

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612423

M. Foschini, R. M. D. Oliveira, O. D. Leite, Oliveira Filho, David Gonçalves

引用次数: 2

Influence of charging parameters on piezoelectricity for cellular polypropylene film electrets 充电参数对多孔聚丙烯薄膜驻极体压电性的影响

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612313

Pengfeng Zhang, Z. Xia, X. Qiu, Feipeng Wang, Xian-Yong Wu

引用次数: 23

Electret Pattern Fornation in Teflon by Pyroeletric and Photogalvanic Electron Emission From LiNbO3 利用LiNbO3的热释电和光电电子发射在聚四氟乙烯中形成驻极体图样

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612347

R. Minamisawa, M. Parada, A. de Almeida, N. Kukhtarev, T. Kukhtareva, R. Zimmerman

{"title":"Electret Pattern Fornation in Teflon by Pyroeletric and Photogalvanic Electron Emission From LiNbO3","authors":"R. Minamisawa, M. Parada, A. de Almeida, N. Kukhtarev, T. Kukhtareva, R. Zimmerman","doi":"10.1109/ISE.2005.1612347","DOIUrl":"https://doi.org/10.1109/ISE.2005.1612347","url":null,"abstract":"High field emission of electrons in the c direction of pyroelectric LiNbO3 has recently been reported [Ref.1]. With modest temperature variations, electron energies are shown to be sufficient to produce the characteristic X-rays from niobium in the crystal and from an adjacent copper foil. We report using these energetic electrons to create the patterned electret state in ETFE (Ethylenetetrafluoroethylene) and in FEP (Tetrafluoroethylene-hexa-fluoropropylene). Temperature sufficient to cause electron emission was established in a LiNbO3 crystal near or in contact with the polymer films. The persistent negative charge near the surface of the films could then be measured nondestructively with a capacitive probe, which we have developed for other electret applications. Photogalvanic electron emission produced by light illumination of the doped photosensitive LiNbO3 crystal was also tested for the electret pattern formation. The charge density injected into the polymer inferred from our measurements is limited by the maximum energy of the pyroelectrically and photogalvanically emitted electrons since the electret field opposes the pyroelectric and photogalvanic field. The density and spatial distribution of charges injected by the pyroelectricity of LiNbO3 into TEFLON electrets are consistent with a selffocusing effect observed in a vacuum by the authors of reference","PeriodicalId":364651,"journal":{"name":"2005 12th International Symposium on Electrets","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116719003","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 study of the programmed cell death, apoptosis, in human leukemia 人白血病细胞程序性死亡、凋亡的介电介质研究

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612434

A. Kanapitsas, P. Vartzeli-Nikaki, A. Konsta, E. Visvardis, E. Sideris

{"title":"Dielectric study of the programmed cell death, apoptosis, in human leukemia","authors":"A. Kanapitsas, P. Vartzeli-Nikaki, A. Konsta, E. Visvardis, E. Sideris","doi":"10.1109/ISE.2005.1612434","DOIUrl":"https://doi.org/10.1109/ISE.2005.1612434","url":null,"abstract":"Previous work in our laboratories showed that Broadband Dielectric Spectroscopy (DRS) reveals the very early physical events on damaged DNA which lead to the disruption of the DNA weak stacking forces. We followed up the evolution of this early physical damage into chemical damage within human cells. The induced chemical lesions result in biological effects including the initiation of programmed cell death, apoptosis, a mechanism resulting in extensive disruption of the external cell membranes. Using sensitive bio-methodologies we revealed that the early DNA damage was finally initiating apoptosis only when the damage was overwhelming intrinsic repair mechanisms. Finally, we were able to study the early stages of membrane alteration, associated with apoptosis, by measuring modifications in the dielectric properties of the cell membrane. It was found that in cells from donors with the chronic lymphocytic leukemia (CLL-cells), which exhibit a higher frequency of apoptosis, the values of the real and the imaginary part of the dielectric permittivity, e*, i.e. e' and e\" respectively, and of the alternate field specific conductivity, s/sub ac/ as a function of frequency, were higher than those of the healthy donors, in which apoptosis occurs at very low frequency.","PeriodicalId":364651,"journal":{"name":"2005 12th International Symposium on Electrets","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123664739","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

Investigation of thin thermoluminescent films of mixed CaSO/sub 4/ and P(VDF-TrFE) copolymers and its blends with PMMA for digital radiography 混合CaSO/sub - 4/和P(VDF-TrFE)共聚物及其与PMMA共混物热释光薄膜的研究

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612385

M. Castro, M.C. Andrade, L. O. Faria

{"title":"Investigation of thin thermoluminescent films of mixed CaSO/sub 4/ and P(VDF-TrFE) copolymers and its blends with PMMA for digital radiography","authors":"M. Castro, M.C. Andrade, L. O. Faria","doi":"10.1109/ISE.2005.1612385","DOIUrl":"https://doi.org/10.1109/ISE.2005.1612385","url":null,"abstract":"The thermoluminescence of [CaSO/sub 4/:Mn] have been explored to produce radiographic images when this material is mixed with pure ferroelectric poly(vinylidene fluoride-trifluorethylene) [P(VDF-TrFE)] copolymer blended with poly(methyl methacrylate) [PMMA]. These polymeric materials have been utilized mainly because of their good optical transparence, good resistance to ionizing radiation and heat diffusion. Thin thermoluminescent films (200/spl mu/m) were prepared by casting and irradiated with gamma and X rays in the presence of human phantoms and metallic standards. The radiographic images were generated in a special device designed to heat the sample to CaSO/sub 4/:Mn main TL peak temperature (136/spl deg/C). The emitted light was collected by a charged coupled device (CCD) camera. The good quality of the obtained radiographic images have demonstrated the feasibility of using TL materials immersed in polymeric matrix as an alternative way to obtain X ray digital images, which are commonly produced by photoluminescence phosphors and X ray sensitive CCD cameras. This investigation has shown that combining new high sensitive TL materials with CCD cameras which presents high response in the blue spectrum range could lead thermoluminescent films to show the same or even better performances than conventional digital radiographic devices.","PeriodicalId":364651,"journal":{"name":"2005 12th International Symposium on Electrets","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123769912","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

How to increase informativity of the TSDC method 如何提高TSDC方法的信息量

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612374

S. Fedosov, A. Sergeeva, T. A. Revenyuk

引用次数: 1

Ferroelectrets: polymer-foam space-charge electrets with ferroelectric-like behaviour 铁电体:具有类铁电行为的聚合物泡沫空间电荷驻极体

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612309

S. Bauer, S. Bauer-Gogonea, F. Camacho-Gonzales, M. Dansachmuller, I. Graz, M. Kaltenbrunner, J. Leonhartsberger, R. Schwodiauer

引用次数: 3