Fabrication of single-domain colloidal crystal gel films and their tuning characteristics
Fabrication of single-domain colloidal crystal gel films and their tuning characteristics
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DOI：
10.1117/12.733274
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发表时间：
2007-09
期刊：
影响因子：
--
通讯作者：
T. Sawada;Toshimitsu Kanai;A. Toyotama
中科院分区：
文献类型：
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作者：
T. Sawada;Toshimitsu Kanai;A. Toyotama
我们已经开发出一种简单的方法来生产大胶体晶体薄膜的带电粒子系统，其中具有单晶状特性的粒子阵列是由流动诱导过程。将多晶悬浮液装入扁平毛细管中并通过强剪切流处理。均匀样品的光学表征表明，几乎所有的毛细管空间（几平方厘米宽，0.1毫米厚）充满了单畴晶体与固定的晶体取向确定的细胞几何形状。通过在悬浮液中加入胶凝剂聚合，可以将单畴晶体固定在自支撑水凝胶膜中。在凝胶化后，发现光学质量保持良好。我们还显示了凝胶晶体在一些不同方面的可调特性。它们可以通过改变溶剂的组成来收缩。通过调整工艺条件可以有效地扩展阻带宽度。这些转换可以作为单个域进行，这应该有利于应用程序的目的。
We have developed a simple method to produce large colloidal crystal films for a like-charged particles system, where particle arrays with single-crystalline-like characteristics are made by a flow-induced process. A poly-crystalline suspension was charged in a flat capillary and processed by strong shear flow. Optical characterizations for the uniform samples indicate that almost all the capillary space (several square centimeters wide and 0.1mm thick) is filled with a single-domain crystal with a fixed crystallographic orientation determined by the cell geometry. The single-domain crystal can be fixed in a self-standing hydro-gel film by polymerizing gelation agents added in the suspension. Upon gelation, the optical quality was found to be well preserved. We also show tunable characteristics of the gelled crystals in some different aspects. They can be contracted by changing the composition of the solvent. The stop-band width can be effectively expanded by adjusting the fabrication condition. These transformations can be made as single domains that should be advantageous to application purposes.