Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/21202
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dc.contributor.authorÅslund, Ingrid-
dc.contributor.authorMedronho, Bruno-
dc.contributor.authorTopgaard, Daniel-
dc.contributor.authorSöderman, Olle-
dc.contributor.authorSchmidt, Claudia-
dc.date.accessioned2012-11-21T10:20:35Z-
dc.date.available2012-11-21T10:20:35Z-
dc.date.issued2011-04-
dc.identifier.citationÅSLUND, Ingrid [et al.] - Homogeneous length scale of shear-induced multilamellar vesicles studied by diffusion NMR. "Journal of Magnetic Resonance". ISSN 1090-7807. 209:2 (2011) 291-299-
dc.identifier.issn1090-7807-
dc.identifier.urihttp://hdl.handle.net/10316/21202-
dc.description.abstractA recently developed protocol for pulsed gradient spin echo (PGSE) NMR is applied for the size determination of multilamellar vesicles (MLVs). By monitoring the self-diffusion behavior of water, the technique yields an estimate of the homogeneous length scale λhom, i.e. the maximum length scale at which there is local structural heterogeneity in a globally homogeneous material. A cross-over between local non-Gaussian to global Gaussian diffusion is observed by varying the experimentally defined length- and time-scales. Occasional observation of a weak Bragg peak in the PGSE signal attenuation curves permits the direct estimation of the MLV radius in favorable cases, thus yielding the constant of proportionality between λhom and radius. The microstructural origin of the Bragg peak is verified through Brownian dynamics simulations and a theoretical analysis based on the center-of-mass diffusion propagator. λhom is decreasing with increasing shear rate in agreement with theoretical expectations and results from 2H NMR lineshape analysis.por
dc.language.isoengpor
dc.publisherElsevierpor
dc.rightsopenAccesspor
dc.subjectDiffusionpor
dc.subjectPulsed-gradient-spin-echo NMRpor
dc.subjectLamellar phasepor
dc.subjectShearpor
dc.titleHomogeneous length scale of shear-induced multilamellar vesicles studied by diffusion NMRpor
dc.typearticlepor
degois.publication.firstPage291por
degois.publication.lastPage299por
degois.publication.issue2por
degois.publication.titleJournal of Magnetic Resonancepor
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S1090780711000401por
dc.peerreviewedYespor
dc.identifier.doi10.1016/j.jmr.2011.01.024-
degois.publication.volume209por
item.fulltextCom Texto completo-
item.grantfulltextopen-
item.languageiso639-1en-
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais
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