Xu Lin, Azhar Umair, Chen Zizhao, Niu Qingxia, Chen Jian, Zhao Xiaohan, Zhang Shuxiang, Zong Chuanyong
Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering, University of Jinan Jinan 250022 P. R. China
College of Chemistry, Central China Normal University Wuhan 430079 P. R. China.
RSC Adv. 2020 Jan 21;10(6):3416-3423. doi: 10.1039/c9ra10569g. eCollection 2020 Jan 16.
Smart surfaces with controlled topography show broad and fantastic applications in optics, biology and information science. Herein, we report a simple visible-light-illumination approach to fabricate a smart wrinkle-forming surface with photo-controllable hierarchical surface patterns as well as rewritable high-resolution patterns of information by using an azobenzene-containing epoxy-based oligomer. The epoxy oligomer was synthesized the ring-opening polymerization of bisphenol AF diglycidyl ether (BADFGE) with -aminoazobenzene (AAB) and characterized using FTIR, H NMR and F NMR spectroscopies. When the epoxy oligomer film was deposited on an elastic substrate, the formation of surface wrinkles was triggered a circulation of heating/cooling and photo-tailored due to photo-softening together with the release of stress induced by cycles of photoisomerization of azobenzene in the oligomer. The wrinkles in selectively light-exposed regions could be photo-erased within tens of seconds, yielding a different pattern of information. The high-resolution photo-printed images were shown to be rewritable for multiple cycles and legible for over 3 months in dark ambient conditions. The as-formed epoxy oligomer wrinkle-forming surface was found to be inexpensive and its fabrication was easily amenable to scale up, indicating its great potential as ink-free light printable media for rewritable information storage.
具有可控拓扑结构的智能表面在光学、生物学和信息科学领域展现出广泛而出色的应用。在此，我们报道了一种简单的可见光照射方法，通过使用含偶氮苯的环氧基低聚物来制造具有光控分级表面图案以及可重写高分辨率信息图案的智能皱纹形成表面。该环氧低聚物通过双酚AF二缩水甘油醚（BADFGE）与对氨基偶氮苯（AAB）的开环聚合反应合成，并使用傅里叶变换红外光谱（FTIR）、核磁共振氢谱（¹H NMR）和氟核磁共振谱（¹⁹F NMR）进行表征。当环氧低聚物薄膜沉积在弹性基板上时，由于光软化以及低聚物中偶氮苯光异构化循环所诱导的应力释放，加热/冷却循环引发了表面皱纹的形成，并通过光进行了定制。在选择性光照区域的皱纹可在数十秒内被光擦除，从而产生不同的信息图案。高分辨率的光打印图像显示可进行多次重写，并且在黑暗环境条件下可清晰显示超过3个月。所形成的环氧低聚物皱纹形成表面被发现成本低廉，其制造易于扩大规模，表明其作为用于可重写信息存储的无墨光打印介质具有巨大潜力。
