Ogumi Keisuke, Nagata Kohki, Takimoto Yuki, Mishiba Kentaro, Matsuo Yutaka
Department of Chemical Systems Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan.
Tokyo Metropolitan Industrial Technology Research Institute, 2-4-10 Aomi, Koto-ku, Tokyo, 135-0064, Japan.
Sci Rep. 2022 Oct 10;12(1):16997. doi: 10.1038/s41598-022-21600-x.
In mechanochromic material research, a serious problem is that mechanical treatment cannot be applied to the materials because of their responsiveness to stimuli. Inkjet printing is a useful solution deposition method for electronics, but materials must be processed to be suitable for an inkjet printer. Fluorenylidene-acridane (FA) exhibits ground-state mechanochromism with visual color changes and responds not only to mechanical pressure but also to alcohol. Alcohol inhibits the color change induced by mechanical stimulation because the mechanochromism of FA is based on a conformational change in its molecular structure. This phenomenon suggests that the mechanochromism of FA can be controlled using alcohol. For use in inkjet printing, minute particles of FA obtained by bead milling in ethanol were investigated for uniformity and size by scanning electron microscopy and gas adsorption measurement. Also, ink containing FA particles was prepared and examined for physical properties such as viscosity and surface tension. It was confirmed that the inkjet-printed pattern demonstrated visual color changes between yellow and green in response to mechanical pressure and alcohol. This report describing the control of mechanochromism and its specific application is expected to contribute to broadening the mechanochromic materials research field.
在机械变色材料研究中，一个严重的问题是由于材料对刺激的响应性，无法对其进行机械处理。喷墨打印是一种用于电子领域的有用的溶液沉积方法，但材料必须经过处理以适合喷墨打印机。芴叉基吖啶（FA）呈现出具有视觉颜色变化的基态机械变色现象，不仅对机械压力有响应，对酒精也有响应。酒精会抑制机械刺激引起的颜色变化，因为FA的机械变色基于其分子结构的构象变化。这一现象表明，可以使用酒精来控制FA的机械变色。为了用于喷墨打印，通过在乙醇中进行珠磨获得的FA微小颗粒，通过扫描电子显微镜和气体吸附测量研究了其均匀性和尺寸。此外，制备了含有FA颗粒的墨水，并检测了其诸如粘度和表面张力等物理性质。证实了喷墨打印图案在受到机械压力和酒精作用时，呈现出黄色和绿色之间的视觉颜色变化。这份描述机械变色控制及其具体应用的报告有望为拓宽机械变色材料研究领域做出贡献。
