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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/23987

Title: PH-switchable stratification of colloidal coatings: surfaces "on demand"
Authors: Martin-Fabiani, Ignacio
Fortini, Andrea
Lesage de la Haye, Jennifer
Koh, Ming L.
Taylor, Spencer E.
Bourgeat-Lami, Elodie
Lansalot, Muriel
D'Agosto, Franck
Sear, Richard P.
Keddie, Joseph L.
Keywords: Stimuli-responsive
Polymerization-induced self-assembly (PISA)
Functional coatings
Stratification
Brownian dynamics simulations
Issue Date: 2016
Publisher: © American Chemical Society
Citation: MARTIN-FABIANI, I. ... et al, 2016. PH-switchable stratification of colloidal coatings: surfaces "on demand". ACS Applied Materials and Interfaces, 8 (50), pp. 34755-34761.
Abstract: Stratified coatings are used to provide properties at a surface, such as hardness or refractive index, which are different from underlying layers. Although time-savings are offered by self-assembly approaches, there have been no methods yet reported to offer stratification on demand. Here, we demonstrate a strategy to create self-assembled stratified coatings, which can be switched to homogeneous structures when required. We use blends of large and small colloidal polymer particle dispersions in water that self-assemble during drying because of an osmotic pressure gradient that leads to a downward velocity of larger particles. Our confocal fluorescent microscopy images reveal a distinct surface layer created by the small particles. When the pH of the initial dispersion is raised, the hydrophilic shells of the small particles swell substantially, and the stratification is switched off. Brownian dynamics simulations explain the suppression of stratification when the small particles are swollen as a result of reduced particle mobility, a drop in the pressure gradient, and less time available before particle jamming. Our strategy paves the way for applications in antireflection films and protective coatings in which the required surface composition can be achieved on demand, simply by adjusting the pH prior to deposition.
Description: This paper is closed access until 30th November 2017.
Sponsor: European Union Seventh Framework Programme BARRIER-PLUS project (FP7-SME-2012-2, No. 304758).
Version: Accepted for publication
DOI: 10.1021/acsami.6b12015
URI: https://dspace.lboro.ac.uk/2134/23987
Publisher Link: http://dx.doi.org/10.1021/acsami.6b12015
ISSN: 1944-8244
Appears in Collections:Closed Access (Materials)

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