Magnetohydrodynamic Aggregation of Cholesterol and Polystyrene Latex Suspensions

Journal of Colloid and Interface Science
K W BuschE Tombácz

Abstract

The aggregation state of flowing (0.49 m s-1 linear velocity) colloidal dispersions of polystyrene latex microspheres (certified particle diameter of 156 ± 6 nm; measured diameter, 156 ± 3 nm at pH 5.3 in 50 mM NaCl) in NaCl solution and cholesterol (measured diameter, 533 ± 9 nm at pH 5.3), stabilized in NaCl solution by sodium taurodeoxycholate, was studied using photon correlation spectroscopy. For cholesterol suspensions having electrolyte concentrations close to the critical coagulation concentration (50 mM NaCl), pronounced aggregation was observed after 15 to 30 min of recirculation in the presence of an orthogonally applied magnetic field (2.0, 1.0 and 0.15 T). In all experiments with cholesterol, aggregation was followed by a period of deaggregation, after which aggregation again occurred. Comparable effects were not observed when cholesterol suspensions were recirculated in the absence of the magnetic field or when the suspensions were exposed to an equivalent magnetic field in the absence of flow. For cholesterol suspensions, the increase in particle size was most pronounced at 0.15 and 1.0 T rather than at 2.0 T. Aggregation effects were also observed when suspensions of polystyrene latex in 200...Continue Reading

Citations

May 16, 2012·The Journal of Chemical Physics·Tzu H Hsieh, Huan J Keh
Feb 2, 2011·The Journal of Chemical Physics·Tzu H Hsieh, Huan J Keh
Dec 2, 2004·Journal of Colloid and Interface Science·Sergej Knez, Ciril Pohar
Nov 25, 2003·Journal of Chemical Information and Computer Sciences·V Kozic, L C Lipus
Dec 17, 2008·Chemical Communications : Chem Comm·Bernard StuyvenJohan A Martens

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