کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
608241 | 1454606 | 2012 | 9 صفحه PDF | دانلود رایگان |
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).
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► Non-close packed binary colloidal crystals (BCCs) and binary inverse opals (BIOs).
► Crack-free BCCs and BIOs can be fabricated at length scales of several centimeters.
► The pseudostop band positions of BCCs and BIOs are adjustable.
► The film thickness was controllable by varying the colloidal volume fraction.
Journal: Journal of Colloid and Interface Science - Volume 380, Issue 1, 15 August 2012, Pages 42–50