About: Epoxy-Based Hydrogels Investigated by High-Frequency Dielectric Relaxation Spectroscopy

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://dx.doi.org/10.1021/jp4058059
Description	Using high-frequency dielectric relaxation spectroscopy, nanophase-separated structures of epoxy-based hydrogels were investigated as a function of water content at 25 degrees C. The dielectric spectra resulting from the hydrogels were reasonably decomposed into two Debye-type and two Cole-Cole-type relaxation modes. The fastest Debye-type mode, found at 8.3 ps, was attributed to the rotational relaxation process of free water molecules in the bulk state. The other Debye-type mode, at ca. 20-34 Ps, originates from the exchange process of water molecules that are hydrogen-bonded to the hydrophilic epoxy network portions for free bulk ones. The first Cole-Cole-type mode observed, at ca. 20-370 Ps, was assigned to the complicated dynamics for electric dipole moments of the hydrophilic groups in the epoxy networks (mainly monomeric oxyethylene units). The slowest major Cole-Cole-type mode, at 5-29 ns, was attributed to the Maxwell-Wagner-Sillars polarization process and confirmed the presence of the nanophase-separated structures as revealed by the previous small-angle neutron scattering experiments. Using high-frequency dielectric relaxation spectroscopy, nanophase-separated structures of epoxy-based hydrogels were investigated as a function of water content at 25 degrees C. The dielectric spectra resulting from the hydrogels were reasonably decomposed into two Debye-type and two Cole-Cole-type relaxation modes. The fastest Debye-type mode, found at 8.3 ps, was attributed to the rotational relaxation process of free water molecules in the bulk state. The other Debye-type mode, at ca. 20-34 Ps, originates from the exchange process of water molecules that are hydrogen-bonded to the hydrophilic epoxy network portions for free bulk ones. The first Cole-Cole-type mode observed, at ca. 20-370 Ps, was assigned to the complicated dynamics for electric dipole moments of the hydrophilic groups in the epoxy networks (mainly monomeric oxyethylene units). The slowest major Cole-Cole-type mode, at 5-29 ns, was attributed to the Maxwell-Wagner-Sillars polarization process and confirmed the presence of the nanophase-separated structures as revealed by the previous small-angle neutron scattering experiments. (en)
Title	Epoxy-Based Hydrogels Investigated by High-Frequency Dielectric Relaxation Spectroscopy Epoxy-Based Hydrogels Investigated by High-Frequency Dielectric Relaxation Spectroscopy (en)
skos:prefLabel	Epoxy-Based Hydrogels Investigated by High-Frequency Dielectric Relaxation Spectroscopy Epoxy-Based Hydrogels Investigated by High-Frequency Dielectric Relaxation Spectroscopy (en)
skos:notation	RIV/00216208:11320/13:10189506!RIV14-GA0-11320___
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(GA13-23392S)
http://linked.open...iv/cisloPeriodika	45
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Krakovský, Ivan
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	73128
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/13:10189506
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	sans; water; networks; hydration; temperature; dynamic-behavior; poly(ethylene oxide); aqueous-solution (en)
http://linked.open.../riv/klicoveSlovo	dynamic-behavior sans poly(ethylene oxide) aqueous-solution hydration temperature networks water
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[372EB6702B35]
http://linked.open...i/riv/nazevZdroje	Journal of Physical Chemistry B
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Vývoj a charakterizace nových teplotně citlivých polymerních hydrogelů
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	117
http://linked.open...iv/tvurceVysledku	Krakovský, Ivan Hasegawa, Ryuta Shikata, Toshiyuki
http://linked.open...ain/vavai/riv/wos	000327111200020
issn	1520-6106
number of pages	7 (xsd:int)
http://bibframe.org/vocab/doi	10.1021/jp4058059
http://localhost/t...ganizacniJednotka	11320

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