Depletion controlled surface deposition of uncharged colloidal spheres from stable bulk dispersions

Research output: Contribution to journalArticle

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.

Details

Authors
Organisations
External organisations
  • Eindhoven University of Technology
  • Utrecht University
  • Lund University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Chemistry
Original languageEnglish
Pages (from-to)3963-3971
Number of pages9
JournalSoft Matter
Volume12
Issue number17
Publication statusPublished - 2016 May 7
Publication categoryResearch
Peer-reviewedYes