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|Title: ||PH-switchable stratification of colloidal coatings: surfaces "on demand"|
|Authors: ||Martin-Fabiani, Ignacio|
Lesage de la Haye, Jennifer
Koh, Ming L.
Taylor, Spencer E.
Sear, Richard P.
Keddie, Joseph L.
Polymerization-induced self-assembly (PISA)
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 document is the Accepted Manuscript version of a Published Work that appeared in final form in
ACS Applied Materials and Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/acsami.6b12015.|
|Sponsor: ||European Union Seventh Framework Programme BARRIER-PLUS project (FP7-SME-2012-2, No. 304758).|
|Version: ||Accepted for publication|
|Publisher Link: ||http://dx.doi.org/10.1021/acsami.6b12015|
|Appears in Collections:||Published Articles (Materials)|
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