School of Chemistry & Chemical Engineering; National Engineering Research Center for Colloidal Materials, Shandong University , Jinan 250100, P. R. China.
ACS Appl Mater Interfaces. 2016 Nov 2;8(43):29713-29720. doi: 10.1021/acsami.6b10620. Epub 2016 Oct 21.
Ink-free rewritable media has attracted great attention as a potential alternative to current paper prints, owing to its benefits to reducing paper production and consumption for environmental protection. It is desirable to develop rewritable media based on cheap, robust, and fast-response photochromic systems. Herein, we report the design and fabrication of flexible and photorewritable PVP/a-WO hybrid membranes through electrospinning, on which images with high resolution can be photoprinted and heat-erased for over 40 cycles. The well conjugated organic-inorganic hybrid structure endows a fast "electron-proton double injection" from PVP to a-WO in the coloration process and greatly improves the photochromic responses. The coloration times can be as short as tens of seconds and the erasure times can be as long as 10 days in ambient conditions. As-formed photochromic membranes are low-cost, environmental benign and easy for large-scale production, indicate their great potential as flexible rewritable media for practical usage.
无墨可重复书写介质作为当前纸质印刷品的潜在替代品吸引了人们极大的关注，因为它有利于减少纸张的生产和消耗，从而保护环境。人们期望开发出基于廉价、坚固和快速响应光致变色体系的可重复书写介质。在此，我们通过静电纺丝设计并制备了柔性的和可光重写的 PVP/a-WO 杂化膜，在该膜上可以进行高分辨率的光打印和热擦除，超过 40 个循环。良好的有机-无机杂化结构赋予了 PVP 到 a-WO 的快速“电子-质子双重注入”，在着色过程中极大地提高了光致变色响应。着色时间可以短至几十秒，在环境条件下擦除时间可以长达 10 天。形成的光致变色膜成本低、环境友好且易于大规模生产，表明其作为实用柔性可重复书写介质具有巨大的潜力。
