A microfluidics-dispensing-printing strategy for Janus photonic crystal microspheres towards smart patterned displays,Journal of Polymer Science

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A microfluidics-dispensing-printing strategy for Janus photonic crystal microspheres towards smart patterned displays
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2022-01-10 , DOI: 10.1002/pol.20210824
Guo‐Xing Li ₁ , Xiao‐Wei Qu ₁ , Lu‐Wei Hao ₁ , Qing Li ₁ , Su Chen ₁

Affiliation

From the implementation point of view, the printable magnetic Janus colloidal photonic crystals (CPCs) microspheres are highly desirable. Herein, we developed a dispensing-printing strategy for magnetic Janus CPCs display via a microfluidics-automatic printing system. Monodisperse core/shell colloidal particles and magnetic Fe₃O₄ nanoparticles precursor serve as inks. Based on the equilibrium of three-phase interfacial tensions, Janus structure is successfully formed, followed by UV irradiation and self-assembly of colloid particle to generate magnetic Janus CPCs microspheres. Notably, this method shows distinct superiority with highly uniform Janus CPCs structure, where the TMPTA/Fe₃O₄ hemisphere is in the bottom side while CPCs hemisphere is in the top side. Thus, by using Janus CPCs microspheres with two different structural colors as pixel points, a pattern with red flower and green leaf is achieved. Moreover, 1D linear Janus CPCs pattern encapsulated by hydrogel is also fabricated. Both the color and the shape can be changed under the traction of magnets, showing great potentials in flexible smart displays. We believe this work not only offers a new feasible pathway to construct magnetic Janus CPCs patterns by a dispensing-printable fashion, but also provides new opportunities for flexible and smart displays.

中文翻译：

Janus 光子晶体微球用于智能图案显示器的微流体点胶打印策略

从实施的角度来看，可印刷的磁性 Janus 胶体光子晶体 (CPC) 微球是非常理想的。在这里，我们通过微流体自动打印系统开发了一种用于磁性 Janus CPC 显示器的点胶打印策略。单分散核/壳胶体颗粒和磁性Fe ₃ O ₄纳米颗粒前体用作油墨。在三相界面张力平衡的基础上，成功形成了Janus结构，再经紫外光照射，胶体粒子自组装生成磁性Janus CPCs微球。值得注意的是，这种方法显示出明显的优势，具有高度均匀的 Janus CPCs 结构，其中 TMPTA/Fe ₃ O ₄半球位于底部，而 CPC 半球位于顶部。因此，通过使用具有两种不同结构颜色的Janus CPCs微球作为像素点，实现了红花绿叶的图案。此外，还制造了由水凝胶封装的一维线性 Janus CPCs 图案。在磁铁的牵引下，颜色和形状都可以改变，在柔性智能显示器中显示出巨大的潜力。我们相信这项工作不仅为通过点胶印刷方式构建磁性 Janus CPCs 图案提供了一条新的可行途径，而且为柔性和智能显示器提供了新的机会。

更新日期：2022-01-10

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