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Inkjet-Printable Amphiphilic Polydiacetylene Precursor for Hydrochromic Imaging on Paper

机译：喷墨打印两亲性聚二乙炔前体，可在纸上进行水致变色成像

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摘要

Hydrochromic materials find great utility in a wide range of applications including humidity sensing and measuring the water contents of organic solvents, as well as substrates for rewritable paper and human sweat pore mapping. Herein, an inkjet printable diacetylene (DA) is described that can be transformed by UV irradiation to a hydrochromic-conjugated polymer on conventional paper. Specifically, an amphiphilic DA that contains an imidazolium ion head-group is found to be compatible with a common office inkjet printer. Various computer-designed images are printed on paper using this substance. UV irradiation of the printed images results in the generation of blue-colored images associated with formation of a polydiacetylene (PDA). The resolutions of the images are almost identical to those generated using a conventional black ink. Importantly, the printed images undergo a blue-to-red color change upon exposure to water and the hydrochromism is found to be temperature dependent. The facile color change that occurs near body temperatures enables use of the hydrochromic PDA-coated paper for rapid and precise mapping of human sweat pores from fingers, palms, and feet.
机译：氢致变色材料在广泛的应用中找到了巨大的用途，包括湿度传感和测量有机溶剂的水含量，以及可重写纸张的基材和人类汗液孔测绘。本文中，描述了可喷墨印刷的二乙炔（DA），其可通过UV辐射转化为常规纸上的水致变色共轭聚合物。具体地，发现包含咪唑鎓离子头基的两亲DA与普通的办公室喷墨打印机兼容。使用该物质可以在纸上打印各种计算机设计的图像。印刷图像的紫外线照射导致生成与聚二乙炔（PDA）相关的蓝色图像。图像的分辨率几乎与使用常规黑色墨水生成的分辨率相同。重要的是，印刷的图像在暴露于水后会发生蓝到红的颜色变化，并且发现水致变色现象与温度有关。在体温附近发生的轻松颜色变化使得可以使用涂有PDA的水致变色纸快速，精确地绘制手指，手掌和脚部的人的汗液孔。

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