Conductivity Spectra of Polyphosphazene based Polyelectrolyte Multilayers
Yazarlar (6)
Yahya Akgöl University Of Münster, Almanya
Christian Hofmann University Of Münster, Almanya
Prof. Dr. Yunus KARATAŞ University Of Münster, Almanya
Cornelia Cramer University Of Münster, Almanya
Hans Dieter Wiemhöfer
University Of Münster, Almanya
Monika Schönhoff
University Of Münster, Almanya
Bildiri Türü Tebliğ/Bildiri Bildiri Dili İngilizce
Bildiri Alt Türü
Bildiri Niteliği Web of Science Kapsamındaki Kongre/Sempozyum
DOI Numarası 10.1021/jp068872w
Kongre Adı 21st Conference of the European Colloid and InterfaceSociety
Kongre Tarihi 10-09-2007 / 14-09-2007
Basıldığı Ülke İsviçre Basıldığı Şehir Cenevre
UAK Araştırma Alanları
Fen Bilimleri ve Matematik
Özet
Polyelectrolyte multilayers are built up from ionically modified polyphosphazenes by layer-by-layer assembly of a cationic (poly[bis(3-amino-N,N, N-trimethyl-l-propanaminium iodide)phosphazene] (PAZ+) and an anionic poly[bis(lithium carboxylatophenoxy)phosphazene] (PAZ-). In comparison, multilayers of poly(sodium 4-styrenesulfonate) (PSS) and poly(allylamine hydrochloride) (PAH) are investigated. Frequency-dependent conductivity spectra are taken in sandwich geometry at controlled relative humidity. Conductivity spectra of ion-conducting materials generally display a dc plateau at low frequencies and a dispersive regime at higher frequencies. In the present case, the dispersive regime shows a frequency dependence, which is deviating from the typical behavior found in most ion-conducting materials. Dc conductivity values, which can be attributed to long-range ionic transport, are on the order of σdc = 10-10-10-7 S·cm-1 and strongly depend on relative humidity. For PAZ +/PAZ- multilayers σdc is consistently larger by one decade as compared to PSS/PAH layers, while the humidity dependence is similar, pointing at general mechanisms. A general law of a linear dependence of log(σdc) on relative humidity is found over a wide range of humidity and holds for both multilayer systems. This very strong dependence was attributed to variations of the ion mobility with water content, since the water content itself is not drastically dependent on humidity. © 2007 American Chemical Society.
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Web of Science 50
Scopus 56
Google Scholar 63
Conductivity Spectra of Polyphosphazene based Polyelectrolyte Multilayers

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İletişim
  • Kırşehir Ahi Evran Üniversitesi Bağbaşı Yerleşkesi, 40100, KIRŞEHİR \ TÜRKİYE
  • unis@ahievran.edu.tr
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