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首页> 外文期刊>Advanced Functional Materials >Fast Switching of Bright Whiteness in Channeled Hydrogel Networks
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Fast Switching of Bright Whiteness in Channeled Hydrogel Networks

机译：通道水凝凝网中的明亮白度快速切换

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摘要

Beside pigment absorption and reflection by periodic photonic structures, natural species often use light scattering to achieve whiteness. Synthetic hydrogels offer opportunities in stimuli-responsive materials and devices; however, they are not conventionally considered as ideal materials to achieve high whiteness by scattering due to the ill-defined porosities and the low refractive index contrast between the polymer and water. Herein, a poly(N-isopropylacrylamide) hydrogel network with percolated empty channels (ch-PNIPAm) is demonstrated to possess switchable bright whiteness upon temperature changes, obtained by removing the physical agarose gel in a semi-interpenetrating network of agarose and PNIPAm. The hydrogel is highly transparent at room temperature and becomes brightly white above 35 degrees C. Compared to conventional PNIPAm, the ch-PNIPAm hydrogel exhibits 80% higher reflectance at 800 nm and 18 times faster phase transition kinetics. The nanoscopic channels in the ch-PNIPAm facilitate water diffusion upon phase transition, thus enabling the formation of smaller pores and enhanced whiteness in the gel. Furthermore, fast photothermally triggered response down to tens of milliseconds can be achieved. This unique property of the ch-PNIPAm hydrogel to efficiently scatter visible light can be potentially used for, e.g., smart windows, optical switches, and, as demonstrated in this report, thermoresponsive color displays.
机译：在色素吸收和周期光子结构的反射旁边，天然物种通常使用光散射来实现白度。合成水凝胶提供刺激响应材料和器件的机会;然而，它们通常被认为是通过散射而导致的理想材料，由于散射而导致的孔隙率和聚合物和水之间的低折射率对比度。这里，通过在温度变化下证明具有渗透空通道（CH-PNIPAM）的聚（N-异丙基丙烯酰胺）水凝胶网络在温度变化下具有可切换的明亮白度，通过在琼脂糖和泊普的半互穿网络中除去物理琼脂糖凝胶而获得。水凝胶在室温下高度透明，并且与常规泊地相比，在35摄氏度上方高于35℃，CH-PNIPAM水凝胶在800nm处的反射率呈现80％，相对于相转移动力学的速度更高。 CH-PNIPAM中的纳米镜通道促进了相变的水扩散，从而能够形成较小的孔并在凝胶中增强白度。此外，可以实现快速光热触发的响应到几十毫秒。 CH-PNIPAM水凝胶的这种独特性能能够有效地散射可见光，可以潜在地用于，例如智能窗口，光开关，以及本报告中所示，热响应彩色显示。

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