Difference between revisions of "Assembly of large-area, highly ordered, crack-free inverse opal films"
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== Overview == | == Overview == | ||
| − | new | + | A new synthesis of crack-free inverse opal films over large scales (cm) is presented. The two step process consists a) of an evaporation of polymeric colloids in a hydrolyzed silicate sol-gel precursor solution and b) a colloidal/matrix coassembly. The synthesis of multilayered hierarchical films are also demonstrated. Furthermore, the inverse opal films were converted to inverse opal films of other materials as porous Si and <math>TiO_2</math> while maintaining their morphology during the gas solid displacement reaction. |
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crack-free inverse opal films over a centimeter scale. Multilayered | crack-free inverse opal films over a centimeter scale. Multilayered | ||
composite colloidal crystal films have been generated via evaporative | composite colloidal crystal films have been generated via evaporative | ||
Revision as of 02:01, 13 September 2010
Birgit Hausmann
Reference
Keywords
Coassembly, colloidal assembly, crack-free films, inverse opals, nanoporous
Overview
A new synthesis of crack-free inverse opal films over large scales (cm) is presented. The two step process consists a) of an evaporation of polymeric colloids in a hydrolyzed silicate sol-gel precursor solution and b) a colloidal/matrix coassembly. The synthesis of multilayered hierarchical films are also demonstrated. Furthermore, the inverse opal films were converted to inverse opal films of other materials as porous Si and <math>TiO_2</math> while maintaining their morphology during the gas solid displacement reaction.
for assembling highly ordered, crack-free inverse opal films over a centimeter scale. Multilayered composite colloidal crystal films have been generated via evaporative deposition of polymeric colloidal spheres suspended within a hydrolyzed silicate sol-gel precursor solution. The coassembly of a sacrificial colloidal template with a matrix material avoids the need for liquid infiltration into the preassembled colloidal crystal and minimizes the associated cracking and inhomogeneities of the resulting inverse opal films. preferential growth along the <110> direction and unusual fracture behavior. We demonstrate that this coassembly approach allows the fabrication of hierarchical structures not achievable by conventional methods, such as multilayered films and deposition onto patterned or curved surfaces.
