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Diffusive Transport in Pores. Tortuosity and Molecular Interaction with the Pore Wall
KTH, Skolan för kemivetenskap (CHE), Kemi, Tillämpad fysikalisk kemi.
KTH, Skolan för kemivetenskap (CHE), Centra, Centrum för Industriell NMR-teknik. KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknologi, Polymera material.ORCID-id: 0000-0003-3049-7225
KTH, Skolan för kemivetenskap (CHE), Centra, Centrum för Industriell NMR-teknik. KTH, Skolan för kemivetenskap (CHE), Centra, Wallenberg Wood Science Center. KTH, Skolan för kemivetenskap (CHE), Kemi, Tillämpad fysikalisk kemi.ORCID-id: 0000-0002-0231-3970
2017 (engelsk)Inngår i: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 121, nr 25, s. 13757-13764Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The self-diffusion of neat water, dimethyl sulfoxide (DMSO), octanol, and the molecular components in a water-DMSO solution was measured by H-1 and H-2 NMR diffusion experiments for those fluids imbibed into controlled pore glasses (CPG). Their highly interconnected structure is scaled by pore size and shows invariant pore topology independent of the size. The nominal pore diameter of the explored CPGs varied from 7.5 to 72.9 nm. Hence, the about micrometer mean-square diffusional displacement during the explored diffusion tithes was much larger than the individual pore size, and the experiment yielded the average diffusion coefficient Great care was taken to establish the actual pore: volumes of the CPGs. Transverse relaxation experiments processed by inverse Laplace transformation were performed to verify that the liquids explored filled exactly the available pore volume. Relative to the respective diffusion coefficients obtained in bulk phases, we observe a reduction in the diffusion coefficient that is independent of pore size for the larger pores and becomes stronger toward the smaller pores. Geometric tortuosity governs the behavior at larger pore sizes, while the interaction with pore walls becomes the dominant factor at our smallest pore diameter. Deviation from the trends predicted by the Renkin equation indicates that the interaction with the pore wall is not a just simple steric one but is in part dependent on the specific features of the molecules explored here.

sted, utgiver, år, opplag, sider
American Chemical Society (ACS), 2017. Vol. 121, nr 25, s. 13757-13764
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URN: urn:nbn:se:kth:diva-211390DOI: 10.1021/acs.jpcc.7b03885ISI: 000404828600036Scopus ID: 2-s2.0-85022231474OAI: oai:DiVA.org:kth-211390DiVA, id: diva2:1130150
Forskningsfinansiär
Swedish Research Council
Merknad

QC 20170808

Tilgjengelig fra: 2017-08-08 Laget: 2017-08-08 Sist oppdatert: 2017-11-10bibliografisk kontrollert

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