Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 380, Issue -, Pages 42-50Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2012.04.076
Keywords
Binary colloidal crystals; Binary inverse opals; Crack-free; Convective self-assembly; Macroporous
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Funding
- Australian Research Council (ARC) [FT100100879]
- Agency for Science, Technology and Research (A*STAR) [0921540099, 0921540098]
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We report an improved convective self-assembly method for the fabrication of highly ordered, crack-free binary colloidal crystals (BCCs) and the associated inverse structures in large domains at length scales of several centimeters. With this method, BCCs can be fabricated in a non-close packed pattern and binary inverse opal films can be obtained over a centimeter scale. The presence of tetraethyl orthosilicate (TEOS) sol in the self-assembly system was found to play a significant role in the resultant structures. The pseudostop band positions are adjustable via varying the number ratio of small to large polystyrene (PS) spheres. At a given TEOS-to-PS ratio, the binary inverse opal film thickness was controllable by varying the colloidal volume fraction with an upper thickness threshold (>16 layers). (C) 2012 Elsevier Inc. All rights reserved.
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