PMID: 8970083Jan 1, 1996Paper

Self-diffusion in fluids in porous glass: confinement by pores and liquid adsorption layers

Magnetic Resonance Imaging
R KimmichE V Khozina

Abstract

Diffusion coefficients of 10 different polar and nonpolar liquids filled in porous glasses with mean pore diameters of 4 or 30 nm were determined with the aid of the NMR field-gradient technique. In the time scale of these experiments (0.3 to 500 ms) diffusion coefficients were found to be time independent. Within the experimental error, no influence of the polarity of the adsorbate can be stated. The diffusion coefficients of all investigated fluids in glass with 4 and 30 nm pores were reduced by factors of 0.17 and 0.63, respectively, relative to the bulk values. This relatively weak reduction can be explained by considering the known porosities of the adsorbents. The second objective of this study was to examine the diffusion behaviour below the melting point of adsorbates in porous glass. Fluids confined in pores do not freeze at the bulk freezing temperatures. In this respect, two phases must be distinguished. A maximal two monolayer thick film adsorbed on the inner surfaces does not crystallize at all, whereas the "free" fraction of the fluid in the pores freezes at reduced temperatures according to the Gibbs-Thompson relation. The nonfrozen surface layers form a network in which self-diffusion can be investigated. Experi...Continue Reading

References

May 1, 1993·Physical Review. B, Condensed Matter·R Kimmich, H W Weber
Nov 22, 1993·Physical Review Letters·J H StrangeE G Smith
Feb 21, 1986·Science·R Orbach
Jul 14, 2009·General Physiology and Biophysics·José Teixeira

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Citations

Feb 13, 2001·Journal of Colloid and Interface Science·B. M. OdintsovR. B. Clarkson
Nov 6, 1998·Magnetic Resonance Imaging·T ZavadaR Kimmich
Nov 6, 1998·Magnetic Resonance Imaging·D W AksnesJ H Strange
Feb 8, 2006·Journal of Controlled Release : Official Journal of the Controlled Release Society·Aharon BlankChi-Hwa Wang
Jul 23, 2004·The Journal of Chemical Physics·Rustem ValiullinVictor Timoshenko
Mar 10, 2004·The European Physical Journal. E, Soft Matter·I BrovchenkoD Paschek
Feb 14, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Patrick Huber
May 16, 2007·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Muslim DvoyashkinJörg Kärger
Apr 20, 2004·Physical Review Letters·Simone HerthRoland Würschum
Oct 9, 2002·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Rustem Valiullin, István Furó
Mar 8, 2008·The Journal of Physical Chemistry. B·Domenico MajolinoUlderico Wanderlingh
Jan 8, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Amir ErfaniJeffery L White
Nov 16, 2021·The European Physical Journal. E, Soft Matter·Horacio R CortiIgal Szleifer

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