Controlling inplane orientation of a monolayer colloidal crystal by meniscus pinning.
Controlling inplane orientation of a monolayer colloidal crystal by meniscus pinning.
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DOI：
10.1021/la104265b
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发表时间：
2011-02
期刊：
影响因子：
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通讯作者：
E. Ng;Kah Mun Chin;C. C. Wong-C.
中科院分区：
文献类型：
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作者：
E. Ng;Kah Mun Chin;C. C. Wong-C.
我们展示了利用表面起伏边界的半月板钉住来控制单层胶体晶体的面内取向，而不中断晶粒的定向。通过优化固定边界和提取速度，控制良好的线性半月板接触线提供胶体晶体的单向生长-⟨11⟩和⟨10⟩平行于线性边缘密集排列的晶体方向-产生单畴晶体，只有孪晶和空位作为残余缺陷存在。钉住效果是通过消除在液体润湿膜中常见的指法不稳定性引起的波浪状接触线而起作用的。研究发现，表面活性剂和胶体颗粒在增强边缘钉住方面发挥了重要作用，在液体脱屑或破裂之前，增加了大块半月板后退的距离。
We demonstrate the usage of meniscus pinning by surface relief boundaries to control in-plane orientation of monolayer colloidal crystals without the interruption of grain disorientation. By optimizing the pinning boundary and withdrawal speed, a well controlled linear meniscus contact line offers unidirectional growth of a colloidal crystal-densely packed crystal direction ⟨11⟩ and ⟨10⟩ parallel to linear edge-giving rise to a single domain crystal with only twins and vacancies present as residual defects. The pinning effect works by eliminating the wavy contact line induced by fingering instability which is commonly found in liquid wetting film. It is found that surfactants and colloidal particles play significant roles to enhance edge pinning, increasing the distance traveled by receding bulk meniscus (during substrate withdrawal) before liquid depinning or rupturing.