Difference between revisions of "Assembly of large-area, highly ordered, crack-free inverse opal films"
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== Results and Discussion == | == Results and Discussion == | ||
| − | + | [[Image:Hatton2010 1.png|200px|thumb|left|Fig. 1 Schematic for inverse opal synthesis: 1) Colloids assemble from a sol-gel solution 2) template removal]] | |
Herein we demonstrate the evaporative coassembly of a sacrificial | Herein we demonstrate the evaporative coassembly of a sacrificial | ||
colloidal template with a matrix material in a single step to | colloidal template with a matrix material in a single step to | ||
yield a colloidal composite, thereby avoiding the need for liquid | yield a colloidal composite, thereby avoiding the need for liquid | ||
infiltration into a preassembled porous structure | infiltration into a preassembled porous structure | ||
| + | |||
| + | [[Image:Hatton2010 2.png|400px|thumb|left|Fig. 2 Highly ordered I-<math>siO_2</math> films formed from PMMA/sol-gel coassembly (Left scale bar is <math>10\mu m </math> and right scale bar is <math>1\mu m </math>)]][[Image:Hatton2010 3.png|500px|thumb|right|caption]] | ||
Cracking seems to occur along {111} planes for thin films, which is consistent with conventional evaporative deposited films, whereas thicker films seem to crack along {110} planes. | Cracking seems to occur along {111} planes for thin films, which is consistent with conventional evaporative deposited films, whereas thicker films seem to crack along {110} planes. | ||
[[Image:Hatton2010 4.png|300px|thumb|right|caption]] | [[Image:Hatton2010 4.png|300px|thumb|right|caption]] | ||
Revision as of 02:39, 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 cm length scales is presented. The two step process consists of a) an evaporative deposition of polymeric colloids in a hydrolyzed silicate sol-gel precursor solution and b) a colloidal/matrix coassembly. The preferential grwoth direction is <110>. 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.
Results and Discussion
Herein we demonstrate the evaporative coassembly of a sacrificial colloidal template with a matrix material in a single step to yield a colloidal composite, thereby avoiding the need for liquid infiltration into a preassembled porous structure
Cracking seems to occur along {111} planes for thin films, which is consistent with conventional evaporative deposited films, whereas thicker films seem to crack along {110} planes.
