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Title: Homogeneous length scale of shear-induced multilamellar vesicles studied by diffusion NMR
Authors: Åslund, Ingrid 
Medronho, Bruno 
Topgaard, Daniel 
Söderman, Olle 
Schmidt, Claudia 
Keywords: Diffusion; Pulsed-gradient-spin-echo NMR; Lamellar phase; Shear
Issue Date: Apr-2011
Publisher: Elsevier
Citation: ÅSLUND, 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
Serial title, monograph or event: Journal of Magnetic Resonance
Volume: 209
Issue: 2
Abstract: A 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.
ISSN: 1090-7807
DOI: 10.1016/j.jmr.2011.01.024
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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