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首页> 外文期刊>Crystal growth & design >Extraction-derived self-organization of colloidal photonic crystal particles within confining aqueous droplets
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Extraction-derived self-organization of colloidal photonic crystal particles within confining aqueous droplets

机译：限制水滴内胶体光子晶体颗粒的提取自组织

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摘要

In this work, we developed a novel and simple microfluidic method for the fabrication of self-assembled monodispersed photonic crystal microbeads with core-shell structures using solvent extraction. Monodispersed aqueous droplets encapsulating colloidal photonic crystal particles were produced in a T-junction microfluidic device, and the controlled transport of water from the aqueous droplets to the oil phase created spherical colloidal crystal microbeads with controlled shell-core structures by extraction-derived self-organization of the colloidal nanoparticles. While the solidification of colloidal particles from emulsion droplets in an oven took tens of hours, the present extraction-derived method reduces the time required for solidification to several minutes. Compared with recent microwave-assisted consolidation methods which showed a particle material dependency, our new method exhibited no such limitation. The results showed that the packing quality of colloidal crystals, which can be precisely controlled by adjusting the extraction rate and surfactant, was high enough to show photonic band-gap characteristics. The reflectance of our photonic microbeads responded precisely to any change in physical properties including the size of colloidal particles and refractive index. A mechanism of the extraction-derived self-assembly of colloidal particles was developed and then supposed by theoretical derivations and experimental results. Finally, the universality of the method was demonstrated by fabricating SiO_2 photonic crystal microbeads.
机译：在这项工作中，我们开发了一种新颖且简单的微流控方法，用于使用溶剂萃取来制造具有核-壳结构的自组装单分散光子晶体微珠。在T型结微流体装置中产生了包封胶体光子晶体颗粒的单分散水珠，通过从萃取中提取的自组织，水从水珠到油相的受控输运产生了具有可控壳核结构的球形胶体晶体微珠。胶体纳米颗粒。尽管在烘箱中从乳液液滴中固化胶体颗粒需要数十小时，但本发明的提取方法将固化所需的时间减少到几分钟。与最近的微波辅助固结方法相比，该方法显示出对颗粒材料的依赖性，我们的新方法没有这种限制。结果表明，通过调节萃取速率和表面活性剂可以精确控制胶体晶体的堆积质量，足以显示光子带隙特性。我们的光子微珠的反射率精确地响应了物理性质的任何变化，包括胶体颗粒的大小和折射率。提出了胶体颗粒提取自组装的机理，并通过理论推导和实验结果进行了推测。最后，通过制备SiO_2光子晶体微珠证明了该方法的普遍性。

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