The dynamics of water in nanoporous silica studied by dielectric spectroscopy

Spanoudaki, A; Albela, B; Bonneviot, L; Peyrard, M

dc.contributor.author	Spanoudaki, A	en
dc.contributor.author	Albela, B	en
dc.contributor.author	Bonneviot, L	en
dc.contributor.author	Peyrard, M	en
dc.date.accessioned	2014-03-01T01:23:10Z
dc.date.available	2014-03-01T01:23:10Z
dc.date.issued	2005	en
dc.identifier.issn	1292-8941	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16850
dc.subject	Activation Energy	en
dc.subject	Dielectric Spectroscopy	en
dc.subject	Silica	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.classification	Physics, Applied	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Computer simulation	en
dc.subject.other	Dielectric properties of liquids	en
dc.subject.other	Dielectric properties of solids	en
dc.subject.other	Hydration	en
dc.subject.other	Nanostructured materials	en
dc.subject.other	Nuclear magnetic resonance spectroscopy	en
dc.subject.other	Silica	en
dc.subject.other	Zeolites	en
dc.subject.other	Dielectric properties of solids and liquids	en
dc.subject.other	Dielectric spectroscopy	en
dc.subject.other	Measurements and simulation of properties of molecules in zeolites	en
dc.subject.other	Nanoporous silica	en
dc.subject.other	Water	en
dc.subject.other	nanomaterial	en
dc.subject.other	silicon dioxide	en
dc.subject.other	water	en
dc.subject.other	adsorption	en
dc.subject.other	article	en
dc.subject.other	chemistry	en
dc.subject.other	diffusion	en
dc.subject.other	evaluation	en
dc.subject.other	impedance	en
dc.subject.other	materials testing	en
dc.subject.other	methodology	en
dc.subject.other	porosity	en
dc.subject.other	spectroscopy	en
dc.subject.other	surface property	en
dc.subject.other	Adsorption	en
dc.subject.other	Diffusion	en
dc.subject.other	Electric Impedance	en
dc.subject.other	Materials Testing	en
dc.subject.other	Nanostructures	en
dc.subject.other	Porosity	en
dc.subject.other	Silicon Dioxide	en
dc.subject.other	Spectrum Analysis	en
dc.subject.other	Surface Properties	en
dc.subject.other	Water	en
dc.title	The dynamics of water in nanoporous silica studied by dielectric spectroscopy	en
heal.type	journalArticle	en
heal.identifier.primary	10.1140/epje/i2004-10101-6	en
heal.identifier.secondary	http://dx.doi.org/10.1140/epje/i2004-10101-6	en
heal.language	English	en
heal.publicationDate	2005	en
heal.abstract	Broad-band dielectric spectroscopy is used to investigate the dynamics of hydration water on the surface of the cylindrical pores of a nanostructured silica material (MCM-41, with pore diameter of 3.2 nm) at various hydrations, in the temperature range 250-150 K. We focus our attention on orientational relaxations that shift from 0.5 MHz at 250 K to less than 1 Hz at 150 K. The measurements distinguish the relaxation of the hydroxyl groups at the surface of silica from the orientational dynamics of hydration water which strongly depends on the degree of hydration. Although it is significantly faster than the dynamics of water in ice, the orientational relaxation of ""non- freezing"" water has an activation energy comparable to that in ice when the hydration layer is complete and approximately two-molecule thick. © EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2005.	en
heal.publisher	SPRINGER	en
heal.journalName	European Physical Journal E	en
dc.identifier.doi	10.1140/epje/i2004-10101-6	en
dc.identifier.isi	ISI:000232026300003	en
dc.identifier.volume	17	en
dc.identifier.issue	1	en
dc.identifier.spage	21	en
dc.identifier.epage	27	en