6533b871fe1ef96bd12d1b78

RESEARCH PRODUCT

Stratification in Drying Polymer–Polymer and Colloid–Polymer Mixtures

Athanassios Z. PanagiotopoulosArash NikoubashmanMichael P. Howard

subject

chemistry.chemical_classificationendocrine systemdigestive oral and skin physiologyStratification (water)Thermodynamics02 engineering and technologySurfaces and InterfacesPolymer010402 general chemistry021001 nanoscience & nanotechnologyCondensed Matter Physicscomplex mixtures01 natural sciences0104 chemical sciencesbody regionsColloidchemistryElectrochemistryRadius of gyrationOrganic chemistryGeneral Materials ScienceDensity functional theory0210 nano-technologyLangevin dynamicsSpectroscopy

description

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.

yearjournalcountryeditionlanguage
2017-08-11Langmuir
https://doi.org/10.1021/acs.langmuir.7b02074