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首页> 外文期刊>Journal of the American Chemical Society >Thermally Driven Unidirectional Crystallization of Charged Colloidal Silica
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Thermally Driven Unidirectional Crystallization of Charged Colloidal Silica

机译:带电胶体二氧化硅的热驱动单向结晶

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摘要

Charged colloidal particles dispersed in water self-assemble into "crystal" structure, when the electrostatic interparticle interaction is sufficiently strong. These colloidal crystals have received considerable attention as photonic crystals since their Bragg wavelengths usually lie in the visible light regime. Thus, ingenious crystallizations have been developed to date. Here, we report a novel directed crystallization of dilute colloidal silica in coexistence with pyridine (Py), under a temperature gradient. This method enables the fabrication of well-oriented and large (1 mm x 10 mm x ~30 mm) single-domain crystals in a short time ( < 10 min). Moreover, the crystals have sharp and deep transmission dips as well as good spatial uniformity in the Bragg wavelength λ_B (~0.1%).
机译:当静电粒子间的相互作用足够强时,分散在水中的带电胶体粒子会自组装为“晶体”结构。这些胶体晶体作为光子晶体受到了广泛的关注,因为它们的布拉格波长通常处于可见光范围内。因此,迄今为止已经开发出巧妙的结晶。在这里,我们报告在温度梯度下与吡啶(Py)共存的稀胶体二氧化硅的新型定向结晶。这种方法可以在短时间内(<10分钟)制造出取向良好的大尺寸(1 mm x 10 mm x〜30 mm)单畴晶体。此外,晶体在布拉格波长λ_B(〜0.1%)内具有陡峭而深的透射率下降以及良好的空间均匀性。

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