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Issue 7, 2010
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Adsorption of star polymers: computer simulations

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Abstract

The behaviour of star polymers adsorbed on smooth surfaces is studied using coarse-grained bead-spring models and Langevin dynamics simulations. The conformational properties of a single adsorbed star polymer in good-solvent conditions are considered as functions of the functionality (number of arms) f, the number of monomers per arm N, and the monomer-surface interaction energy εs. Four conformational regimes are identified: a linear-polymer regime; a two-dimensional star polymer regime; a sombrero regime; and a colloidal regime. The latter three correspond to regimes predicted theoretically by Halperin and Joanny [J. Phys. II (France), 1991, 1, 623–636]. Solvent effects are explored by dialing in effective attractions between the monomer beads; with decreasing solvent quality, the star polymers adopt more compact, globular structures. Good-solvent to bad-solvent quenches at finite surface coverages are considered; these correspond to established experimental protocols for adsorbing and then drying polymer sub-monolayers on surfaces. The structure of the polymer film is surveyed as a function of surface coverage, f, N, and εs, in good-solvent and bad-solvent conditions. The simulated post-quench structures are in good qualitative agreement with those observed in atomic-force microscopy measurements, while the simulated pre-quench structures shed light on the microscopic mechanisms of film formation. This study draws together much of what is known about surface-adsorbed star polymers from theory, simulation, and experiment.

Graphical abstract: Adsorption of star polymers: computer simulations

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Article information


Submitted
03 Nov 2009
Accepted
05 Jan 2010
First published
08 Feb 2010

Soft Matter, 2010,6, 1483-1493
Article type
Paper

Adsorption of star polymers: computer simulations

A. Chremos, P. J. Camp, E. Glynos and V. Koutsos, Soft Matter, 2010, 6, 1483
DOI: 10.1039/B922988D

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