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Silica Nanoparticles Three Dimensional Assembly: An Integrative Chemistry Approach Toward Designing Opal-Like Silica Foams

Published online by Cambridge University Press:  01 February 2011

Florent CARN  and
Renal BACKOV
Florent CARN
Affiliation:
carn@crpp-bordeaux.cnrs.fr, C.R.P.P. CNRS UPR 8641, 115 Ave. Albert Schweitzer, Pessac, F-33600, France
Renal BACKOV
Affiliation:
backov@crpp-bordeaux.cnrs.fr, C.R.P.P. CNRS UPR 8641, Physical chemistry, 115 Ave. Albert Schweitzer, Pessac, F-33200, France
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Abstract

Novel meso-/macroporous SiO2 monoliths have been reached by applying a nanotectonic pathway within a confined geometry, i.e. a non-static air-liquid foam pattering process. Final scaffolds are a very close transcription of the tailored periodic air-liquid foam template while highly ordered close-packed silica colloids are texturing the as-synthesized foam walls. The interconnected nanoparticles and associated void space between adjacent particles allow generating intrinsic mesopores, thereby defining hierarchically organized porous scaffolds. The good control over both the air-liquid foam's water volume fraction and the bubble size allow a rational tuning of the macropore shape (diameter, Plateau border's width). At the nano-scale, heterogeneous textural character is associated with abrupt variation in the film's topology certainly governed by the complex liquid flow present within the foam film. This flow induces a surfactant concentration gradient that causes a sort of marginal regeneration on the side of the film. According to these observations, the heterogeneous character of the film surface revealed by AFM can be interpreted like a direct expression of the liquid flow within the air-liquid foam's film.

Keywords

foamsol-gelnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1017 , 2007 , 1017-DD11-10
Copyright
Copyright © Materials Research Society 2007

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