Stratification in Drying Polymer-Polymer and Colloid-Polymer Mixtures

Michael P. Howard, Arash Nikoubashman, Athanassios Z. Panagiotopoulos

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Drying polymer-polymer and colloid-polymer mixtures were studied using Langevin dynamics computer simulations. Polymer-polymer mixtures vertically stratified into layers, with the shorter polymers enriched near the drying interface and the longer polymers pushed down toward the substrate. Colloid-polymer mixtures stratified into a polymer-on-top structure when the polymer radius of gyration was comparable to or smaller than the colloid diameter, and a colloid-on-top structure otherwise. We also developed a theoretical model for the drying mixtures based on dynamical density functional theory, which gave excellent quantitative agreement with the simulations for the polymer-polymer mixtures and qualitatively predicted the observed polymer-on-top or colloid-on-top structures for the colloid-polymer mixtures.

Original languageEnglish (US)
Pages (from-to)11390-11398
Number of pages9
JournalLangmuir
Volume33
Issue number42
DOIs
StatePublished - Oct 24 2017

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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