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Mourran A, Wu Y, Gumerov RA, et al. When Colloidal Particles Become Polymer Coils. Langmuir. 2016;32(3):723-30doi: 10.1021/acs.langmuir.5b03931.
Mourran, A., Wu, Y., Gumerov, R. A., Rudov, A. A., Potemkin, I. I., Pich, A., & Möller, M. (2016). When Colloidal Particles Become Polymer Coils. Langmuir : the ACS journal of surfaces and colloids, 32(3), 723-30. https://doi.org/10.1021/acs.langmuir.5b03931
Mourran, Ahmed, et al. "When Colloidal Particles Become Polymer Coils." Langmuir : the ACS journal of surfaces and colloids vol. 32,3 (2016): 723-30. doi: https://doi.org/10.1021/acs.langmuir.5b03931
Mourran A, Wu Y, Gumerov RA, Rudov AA, Potemkin II, Pich A, Möller M. When Colloidal Particles Become Polymer Coils. Langmuir. 2016 Jan 26;32(3):723-30. doi: 10.1021/acs.langmuir.5b03931. Epub 2016 Jan 12. PMID: 26717422.
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Langmuir. 2016 Jan 26;32(3):723-30. doi: 10.1021/acs.langmuir.5b03931. Epub 2016 Jan 12.

When Colloidal Particles Become Polymer Coils.

Langmuir : the ACS journal of surfaces and colloids

Ahmed Mourran, Yaodong Wu, Rustam A Gumerov, Andrey A Rudov, Igor I Potemkin, Andrij Pich, Martin Möller

Affiliations

  1. DWI - Leibniz Institute for Interactive Materials, and Functional Interactive Polymers, Institute of Technical and Macromolecular Chemistry, RWTH Aachen University , Forckenbeckstr. 50, 52056 Aachen, Germany.
  2. Physics Department, Lomonosov Moscow State University , Moscow 119991, Russian Federation.

PMID: 26717422 DOI: 10.1021/acs.langmuir.5b03931

Abstract

This work concerns interfacial adsorption and attachment of swollen microgel with low- to medium-level cross-linking density. Compared to colloids that form a second, dispersed phase, the suspended swollen microgel particles are ultrahigh molecular weight molecules, which are dissolved like a linear polymer, so that solvent and solute constitute only one phase. In contrast to recent literature in which microgels are treated as particles with a distinct surface, we consider solvent-solute interaction as well as interfacial adsorption based on the chain segments that can form trains of adsorbed segments and loops protruding from the surface into the solvent. We point out experimental results that support this discrimination between particles and microgels. The time needed for swollen microgels to adsorb at the air/water interface can be 3 orders of magnitude shorter than that for dispersed particles and decreases with decreasing cross-linking density. Detailed analysis of the microgels deformation, in the dry state, at a solid surface enabled discrimination particle like microgel in which case spreading was controlled predominantly by the elasticity and molecule like adsorption characterized by a significant overstreching, ultimately leading to chain scission of microgel strands. Dissipative particle dynamics simulations confirms the experimental findings on the interfacial activity and spreading of microgel at liquid/air interface.

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