Size- and shape-dependent separation of TiO2 colloidal sub-populations with gravitational field flow fractionation |
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Authors: | Rasouli S Blanchart P Clédat D Cardo P J |
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Affiliation: | Laboratoire de Chimie Analytique et de Bromatologie, Université de Limoges Faculté de Pharmacie, France. |
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Abstract: | The simplest field flow fractionation technique, which uses the earth's gravity as the external field is applied to isolate two populations, which differ in both shape and size, from a polydisperse sub-micron TiO2 powder of homogenous density. The fraction eluted first is spherical with an average diameter of 0.31 microm while the second fraction is ellipsoidal and can be associated with a 0.45 microm hydrodynamic diameter. Elution conditions appeared to be very sensitive to electrolyte and surfactant characteristics in the carrier phase as well as on the sample concentration. Using 25 microl (1%, w/w) sample suspension, separations of spherical from ovoid particles was performed in almost 2 h with a mobile phase of 0.001 M KNO3-0.01% (v/v) Fl-70 in water in a 0.025-cm thick channel made of polystyrene walls. |
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