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A Dynamic Force Balance Model for Colloidal Expansion and Its DLVO-Based Application
KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk apparatteknik.ORCID-id: 0000-0001-6801-9208
KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk apparatteknik.ORCID-id: 0000-0001-8241-2225
KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk apparatteknik.
2009 (engelsk)Inngår i: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 25, nr 2, s. 679-687Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A force balance model that describes the dynamic expansion of colloidal bentonite gels/sols is presented. The colloidal particles are assumed to consist of one or several thin sheets with the other dimensions much larger than their thickness. The forces considered include van der Waals force, diffuse double layer force, thermal force giving rise to Brownian motion, gravity, as well as friction force. The model results in an expression resembling the instationary diffusion equation but with an immensely variable diffusivity. This diffusivity is strongly influenced by the concentration of counterions as well as by the particle concentration in the colloid gel/sol. The properties of the model are explored and discussed, exemplified by the upward expansion of an originally highly compacted bentonite tablet in a test tube. Examples are presented for a number of cases with ionic concentrations varying between very dilute waters up to several molar of counterions. The volume fraction of particles ranges from 40% to very dilute sols.

sted, utgiver, år, opplag, sider
2009. Vol. 25, nr 2, s. 679-687
Emneord [en]
highly-charged plates, concentrated dispersions, constant charge, particles, montmorillonite, electrolyte, suspensions, behavior, phase, gels
Identifikatorer
URN: urn:nbn:se:kth:diva-18102DOI: 10.1021/la8026573ISI: 000262431100010PubMedID: 19105788Scopus ID: 2-s2.0-60849099635OAI: oai:DiVA.org:kth-18102DiVA, id: diva2:336148
Merknad
QC 20100525Tilgjengelig fra: 2010-08-05 Laget: 2010-08-05 Sist oppdatert: 2020-03-09bibliografisk kontrollert

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