Janus Multicolored Photonic Crystal Beads for Real-Time Magnetic Responsive Patterns
Janus Multicolored Photonic Crystal Beads for Real-Time Magnetic Responsive Patterns
复制标题
用于实时磁响应图案的 Janus 彩色光子晶体珠
DOI：
10.1002/ppsc.201900238
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发表时间：
2019
影响因子：
2.7
通讯作者：
Wei Jie
中科院分区：
文献类型：
--
作者：
Huang Chao;Cheng Yu;Zhang Hanbing;Wei Jie
光子Janus粒子可以在不同的刺激下改变颜色，在各种应用中显示出巨大的前景，例如光学探针，催化剂载体，传感器和显示材料。然而，用简单的方法制备Janus结构着色颗粒仍然是一个挑战。受ecsenius bicolors的启发，利用亚微米级的胶体粒子和由Fe3O4组成的磁性纳米粒子，建立了Janus结构彩色微珠（JSCB）的简易制备方法。采用单分散胶体粒子和磁性纳米粒子与聚二甲基硅氧烷前驱体引发剂制备了混合乳液。乳液在室温环境中的后续自组装提供了两种不同的结构颜色，这要归功于胶体颗粒和Fe3O4纳米颗粒的重力沉积。通过改变单分散胶体纳米颗粒的尺寸，可以精确控制JSCBs的光子带隙，而PDMS的存在则使JSCBs的结构色面具有较高的光学质量和机械强度。在磁体的存在下，JSCB可以在两种不同的结构颜色之间同时改变它们的取向。此外，JSCB能够编码和角度无关显示，这对于它们在防伪，信息编码和图案显示中的应用至关重要。
Photonic Janus particles that can change colors in different stimuli have shown great promise in various applications, such as optical probes, catalyst supports, sensors, and display materials. However, it remains a challenge to produce Janus structural colored particles with a simple method. Inspired from ecsenius bicolors, a facile preparation of Janus structural colored beads (JSCBs) using sub‐micrometer‐sized colloidal particles and magnetic nanoparticles composed of Fe3O4is established. A mixed emulsion is prepared by monodispersed colloidal particles and magnetic nanoparticles and initiator of PDMS precursor. Subsequent self‐assembly of the emulsion in the room temperature environment provides two different structural colors, thanks to the gravity deposition of colloidal particles and Fe3O4nanoparticles. The photonic bandgap of JSCBs can be precisely controlled with varying size of monodispersed colloidal nanoparticles, and the high optical quality and mechanical strength of the structural colored face are attributed to the existence of PDMS. In the presence of a magnet, the JSCBs can change their orientation simultaneously between two different structural colors. Moreover, the JSCBs are capable of encoding and angle‐independent displaying, which are crucial to their applications in anticounterfeiting, information coding, and pattern display.