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SEM and TEM of Metallic Inverse Opals

Published online by Cambridge University Press:  02 July 2020

C.F. Blanford ,
H.W. Yan ,
A. Stein  and
C.B. Carter
C.F. Blanford
Affiliation:
Department of Chemistry, University of Minnesota, Minneapolis, MN55455-0431
H.W. Yan
Affiliation:
Department of Chemistry, University of Minnesota, Minneapolis, MN55455-0431
A. Stein
Affiliation:
Department of Chemistry, University of Minnesota, Minneapolis, MN55455-0431
C.B. Carter
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN55455-0132
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Extract

Drawing on nature, synthetic opals (e.g., gilsonite) consist of uniformly sized ceramic spheres ordered into large close-packed domains. In order to improve the toughness or appearance of these chemically bonded ceramics, a polymer is often infiltrated into the interconnected space between the packed spheres. In a similar fashion, colloidal crystal arrays of submicrometer silica or polymer spheres have been employed as templates for periodic porous solids. All the methods for preparing periodic macroporous materials share a common synthetic thread: first, the colloidal crystals are formed from monodisperse spheres; next, the void spaces are filled and solidified; finally, the template is removed by heat, by refluxing in a solvent such as THF (in the case of polymer spheres), or by soaking in hydrofluoric acid (in the case of silica spheres). The product, which can be thought of as an “inverse opal,” often exhibits the same iridescence as a natural opal due to the similarity between the periodicity of the wall structure and the wavelength of light.

Type
Sir John Meurig Thomas Symposium: Microscopy and Microanalysis in the Chemical Sciences
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 70 - 71
Copyright
Copyright © Microscopy Society of America

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