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Low-temperature phase separation of a binary liquid mixture in porous materials studied by cryoporometry and pulsed-field-gradient NMR
KTH, Superseded Departments, Chemistry.ORCID iD: 0000-0002-0231-3970
2002 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1063-651X, E-ISSN 1095-3787, Vol. 66, no 3Article in journal (Refereed) Published
Abstract [en]

The low-temperature liquid-liquid phase separation of the partially miscible hexane-nitrobenzene mixture imbibed in porous glasses of different pore sizes from 7 to 130 nm has been studied using H-1 NMR (nuclear magnetic resonance) cryoporometry and pulse field gradient NMR methods. The mixture was quenched below both its upper critical solution temperature (T-cr) and the freezing point of nitrobenzene. The size distribution of frozen nitrobenzene domains was derived through their melting point suppression according to the Gibbs-Thompson relation. The obtained data reveal small initial droplets of nitrobenzene surrounded by hexane, which are created as the temperature is decreased below T-cr and which thereafter coalesce by a droplet-diffusion mechanism. The inter-relation between the pore size and the found size distribution and shapes of nitrobenzene domains is discussed, as well as several aspects of molecular self-diffusion.

Place, publisher, year, edition, pages
2002. Vol. 66, no 3
Keyword [en]
self-diffusion, domain-growth, fluid mixture, critical fluctuations, confined geometry, melting behavior, cylindrical pore, transitions, media, glass
URN: urn:nbn:se:kth:diva-21970DOI: 10.1103/PhysRevE.66.031508ISI: 000178623300033OAI: diva2:340668
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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