Dielectric studies of polyacrylamide hydrogels

Konsta Amalia, A; Daoukaki, Despina; Kyritsis, Apostolos; Pissis, Poly

dc.contributor.author	Konsta Amalia, A	en
dc.contributor.author	Daoukaki, Despina	en
dc.contributor.author	Kyritsis, Apostolos	en
dc.contributor.author	Pissis, Poly	en
dc.date.accessioned	2014-03-01T02:41:11Z
dc.date.available	2014-03-01T02:41:11Z
dc.date.issued	1996	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30414
dc.subject	Dielectric Properties	en
dc.subject	Dielectric Relaxation	en
dc.subject	Glass Transition	en
dc.subject	Water Content	en
dc.subject.other	Dielectric relaxation	en
dc.subject.other	Glass transition	en
dc.subject.other	Hydration	en
dc.subject.other	Hydrogels	en
dc.subject.other	Molecules	en
dc.subject.other	Polymers	en
dc.subject.other	Spectroscopy	en
dc.subject.other	Temperature	en
dc.subject.other	Water	en
dc.subject.other	Dielectric dispersion	en
dc.subject.other	Dielectric relaxation spectroscopy	en
dc.subject.other	Polyacrylamide hydrogels	en
dc.subject.other	Thermally stimulated depolarization current	en
dc.subject.other	Water crystallization	en
dc.subject.other	Water molecule	en
dc.subject.other	Dielectric properties	en
dc.title	Dielectric studies of polyacrylamide hydrogels	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1109/ISE.1996.578205	en
heal.identifier.secondary	http://dx.doi.org/10.1109/ISE.1996.578205	en
heal.publicationDate	1996	en
heal.abstract	The dielectric properties of polyacrylamide/water hydrogels, as a function of water content and temperature, are investigated using ac dielectric relaxation spectroscopy (DRS) in the frequency range 5 Hz - 13 MHz and thermally stimulated depolarization currents (TSDC) in the temperature range 77 - 300 K. TSDC spectra reveal three peaks, the first two being attributed to the reorientation of free and loosely bound water molecules respectively, whereas the third one is a manifestation of the glass transition in the hydrogel constituents. DRS spectra display a dielectric dispersion which shifts gradually to lower frequencies with decreasing T. The water crystallization at T < 0 oC, as well as the non-reversibility of the freezing-thawing process, are clearly demonstrated from the evolution of ac conductivity spectra with temperature.	en
heal.publisher	IEEE, Piscataway, NJ, United States	en
heal.journalName	Proceedings - International Symposium on Electrets	en
dc.identifier.doi	10.1109/ISE.1996.578205	en
dc.identifier.spage	772	en
dc.identifier.epage	777	en