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Interfacial phenomena in starch/fumed silica at varied hydration levels

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dc.contributor.author Gun'ko, VM en
dc.contributor.author Pissis, P en
dc.contributor.author Spanoudaki, A en
dc.contributor.author Turova, AA en
dc.contributor.author Turov, VV en
dc.contributor.author Zarko, VI en
dc.contributor.author Goncharuk, EV en
dc.date.accessioned 2014-03-01T01:28:42Z
dc.date.available 2014-03-01T01:28:42Z
dc.date.issued 2008 en
dc.identifier.issn 0927-7757 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/18924
dc.subject 1H NMR spectroscopy en
dc.subject Cryoporometry en
dc.subject DRS en
dc.subject Fumed silica en
dc.subject Hydrogel en
dc.subject Starch en
dc.subject TSDC en
dc.subject Unfrozen water en
dc.subject Wetted powder en
dc.subject.classification Chemistry, Physical en
dc.subject.other Hydration en
dc.subject.other Nuclear magnetic resonance spectroscopy en
dc.subject.other Silica fume en
dc.subject.other Surface chemistry en
dc.subject.other Non-gelatinised starch en
dc.subject.other Wetted powders en
dc.subject.other Starch en
dc.subject.other nanoparticle en
dc.subject.other polymer en
dc.subject.other silicon dioxide en
dc.subject.other starch en
dc.subject.other analytic method en
dc.subject.other article en
dc.subject.other dielectric relaxation spectroscopy en
dc.subject.other freezing en
dc.subject.other high temperature en
dc.subject.other hydration en
dc.subject.other hydrogel en
dc.subject.other methodology en
dc.subject.other priority journal en
dc.subject.other proton nuclear magnetic resonance en
dc.subject.other spectroscopy en
dc.subject.other thermally stimulated depolarisation current method en
dc.subject.other thermodynamics en
dc.title Interfacial phenomena in starch/fumed silica at varied hydration levels en
heal.type journalArticle en
heal.identifier.primary 10.1016/j.colsurfa.2008.02.004 en
heal.identifier.secondary http://dx.doi.org/10.1016/j.colsurfa.2008.02.004 en
heal.language English en
heal.publicationDate 2008 en
heal.abstract Hydrated powders of non-gelatinised starch and hydrogels of gelatinised starch alone or with addition of modified nanosilica (with grafted aminopropylmethylsilyl groups substituting one-third of surface silanols) were studied using broadband dielectric relaxation spectroscopy (DRS), thermally stimulated depolarisation current (TSDC) method and H-1 NMR spectroscopy with layer-by-layer freezing-out of bulk and interfacial waters. The H-1 NMR and TSDC techniques with the use of Gibbs-Thomson relation for the freezing point depression allow us to calculate: (i) the thermodynamic parameters of interfacial water weakly and strongly bound to polymer molecules and nanoparticles; (ii) size distributions of pores filled by structured water; (iii) surface area and volume of micro-, meso- and macropores. The DRS and TSDC results for hydrogels and hydrated powders with starch/modified fumed silica show that the beta- and gamma-relaxations of starch are strongly affected by water and functionalised silica nanoparticles which slow down both low- and high-frequency and low- and high-temperature relaxations. (C) 2008 Elsevier B.V. All rights reserved. en
heal.publisher ELSEVIER SCIENCE BV en
heal.journalName Colloids and Surfaces A: Physicochemical and Engineering Aspects en
dc.identifier.doi 10.1016/j.colsurfa.2008.02.004 en
dc.identifier.isi ISI:000256871100037 en
dc.identifier.volume 320 en
dc.identifier.issue 1-3 en
dc.identifier.spage 247 en
dc.identifier.epage 259 en


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