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Updated: Mar 23, 2026

Synthesis and Characterization of Supramolecular Colloids
Published on: April 22, 2016
Depletion controlled surface deposition of uncharged colloidal spheres from stable bulk dispersions
Samia Ouhajji1, Tommy Nylander, Lennart Piculell
1Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute for Nanomaterials Science, Utrecht University, Padualaan 8, 3584 CH, The Netherlands. S.Ouhajji@uu.nl A.P.Philipse@uu.nl.
Abstract:
The competition between surface adsorption and bulk aggregation was investigated for silica colloids dispersed in cyclohexane in contact with hydrophobized silica substrates. Central to this study is that the colloids and surfaces have the same material and surface properties. Colloid-colloid and colloid-surface interactions were controlled by addition of polymers providing depletion interaction. Bulk instability was determined by turbidity and viscosity measurements and surface adsorption by ellipsometry measurements. At increasing polymer concentration, strong surface adsorption occurred at polymer concentrations below that required for bulk phase separation. Complementary Monte Carlo simulations with the use of a new weak depletion theory support quantitatively the experimental observation of the existence of an interval of interaction strength at which aggregation in bulk is negligible while surface adsorption is substantial.
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