Abstract
Dispersions of hydrophilic and hydrophobic SiO2 particles in binary mixtures (ethanol-cyclohexane, ethanol-toluene, benzene-n-heptane) were studied in order to gain information on the interaction between the solid particles and the dispersion medium as well as on interparticle interactions.
Knowledge of interparticle interactions and wetting on the solid/liquid interface allows valuable information to be obtained regarding the stability of disperse systems. Adsorption excess isotherms need to be determined in binary mixtures for determination of the composition and thickness of the adsorption layer. Heat of wetting and free energy of wetting are also indicative of the strength of the solid/liquid interfacial interaction. Interparticle interactions were characterized by the rheological properties of the suspensions (yield value, energy of separation). The structure and the aggregated/disaggregated state of the suspensions were inferred from light and X-ray scattering data. It may be established that interactions between dispersed SiO2 particles are determined by the composition of the binary mixture, the thickness of the adsorption layer and the Hamaker constants of the dispersion medium and the adsorption layer.
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© 1998 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG
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Dékány, I., Haraszti, T., Turi, L., Király, Z. (1998). Stability of hydrophilic/hydrophobic silica particles in binary liquids: Adsorption, rheological and SAXS experiments. In: Rehage, H., Peschel, G. (eds) Structure, Dynamics and Properties of Disperse Colloidal Systems. Progress in Colloid & Polymer Science, vol 111. Steinkopff. https://doi.org/10.1007/BFb0118111
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DOI: https://doi.org/10.1007/BFb0118111
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