Journal article
A pure aqueous route to mesoporous silica thin films via dip-coating of prefabricated hybrid micelles


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Publication Details
Author list: Zschiedrich H, Boissiere C, Kooyman P, Prouzet E.
Publisher: Springer Verlag (Germany)
Publication year: 2017
Journal: Journal of Sol-Gel Science and Technology
Volume number: 81
Start page: 514
End page: 522
Total number of pages: 9
ISSN: 0928-0707
eISSN: 1573-4846

Abstract

Mesoporous thin films were prepared by dip-coating with a
purely aqueous method, as a substitute for the alcohol-based
evaporation-induced self-assembly route. Unlike other aqueous routes
that require a very slow pulling rate possible only using high
performance dip-coaters, as a result of the high surface tension of
water, this new process works with standard dip-coaters and at similar
pulling rates as are used for the evaporation-induced self-assembly
route. This unique asset is the result of the synthesis of prefabricated
self-assembled silicate/organic hybrid micelles. These building blocks
are concentrated before use, which provides a gelling edge after
moderate evaporation. As a result, defect-free continuous mesoporous
films with well-organized hexagonally packed pores were prepared after
optimization of both the evaporation rate of the solution of hybrid
micelles and the dip-coater pulling rate. Graphic Abstract: The
transmission electron microscopy observation reveals the hexagonally
packed structure of mesoporous silica film. This nanostructure has
already been observed on films prepared with the evaporation-induced
self-assembly process, but it is the first time it is obtained with a
pure aqueous method, based on prefabricated hybrid micelles, not on
controlled evaporation of mesophases.


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Last updated on 2017-16-11 at 09:08