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 ==
 +
 +
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.   
 
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 02:21, 13 September 2010

Birgit Hausmann

Reference

B. Hatton et. al. "Assembly of large-area, highly ordered, crack-free inverse opal films" PNAS 107 (23) 2010

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.

caption