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Modelling viscosity temperature dependence of supercooled sucrose solutions: the random-walk approach

2007Journal article Restricted access
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dc.contributor.authorQuintas, Mafalda
dc.contributor.authorBrandão, Teresa R. S.
dc.contributor.authorSilva, Cristina L. M.
dc.contributor.authorCunha, Rosiane L.
dc.date.accessioned2011-10-21T16:28:59Z
dc.date.available2011-10-21T16:28:59Z
dc.date.issued2007
dc.description.abstractSucrose and its supersaturated or supercooled solutions are of the utmost importance in areas as different as food and pharmaceutical industries or cryopreservation of biological systems. In the supercooled “state”, such amorphous solutions are fragile systems, presenting extremely high viscosity with decreased mobility of molecules, impairing experimental determinations at low temperatures (below critical temperature, Tc). This work proposes the random walk (RW) approach to study relaxation behavior in the supercooled melt, using only viscosity data at temperatures above Tc. For comparison purposes, the Vogel-Fulcher-Tamman (VFT) model was fitted to th data. The random walk approach is based on the distribution of molecular energies, thus having a theoretical support not found in the VFT model. The RW estimated parameters can be correlated with system characteristics, showing their dependence on water content or sucrose concentration. RW and VFT model description was evaluated from the mathematical and physical points of view, but the random walk model led to more consistent regression results and parameter estimates with improved precisionpor
dc.identifier.citation"Journal of Physical Chemistry B". ISSN 1520-6106. 111: 12 (2007) 3192-3196por
dc.identifier.doi10.1021/jp068345c
dc.identifier.urihttp://hdl.handle.net/10400.14/6740
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherAmerican Chemical Societypor
dc.titleModelling viscosity temperature dependence of supercooled sucrose solutions: the random-walk approachpor
dc.typejournal article
dspace.entity.typePublication
person.familyNameBrandão
person.familyNameSilva
person.givenNameTeresa
person.givenNameCristina
person.identifierJ-9418-2012
person.identifier1473674
person.identifier.ciencia-id7B19-E23B-BB31
person.identifier.ciencia-id6611-634A-132C
person.identifier.orcid0000-0002-8857-6471
person.identifier.orcid0000-0002-0495-3955
person.identifier.ridJ-9418-2012
person.identifier.ridA-3568-2013
person.identifier.scopus-author-id6602174128
person.identifier.scopus-author-id7201387397
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublicationebf7ead0-3772-4fd6-988c-f6b8722de84e
relation.isAuthorOfPublication4e2903de-0679-4cb1-981e-10de14c0c995
relation.isAuthorOfPublication.latestForDiscoveryebf7ead0-3772-4fd6-988c-f6b8722de84e

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