Yu Yanfang, Liu Hongli, Zhen Yinzhao, Liu Ye, Gao Bonan, Li Xianggao, Wang Shirong
School of Chemical Engineering and Technology, Tianjin University Tianjin 300072 China
Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072 China.
Nanoscale Adv. 2024 May 14;6(16):4111-4118. doi: 10.1039/d4na00301b. eCollection 2024 Aug 6.
Electrophoretic displays (EPDs) are attracting attention as potential candidates for information display due to their eye-friendly nature, environmental friendliness and bistability. However, their response speed, which is closely related to the charging behavior of electrophoretic particles, is still inadequate for practical applications. Herein, five basic surfactants were employed to adjust the particle charge of titanium dioxide (TiO) in the apolar medium Isopar L. Particle charge is strongly related to the effective surfactant coverage on surface sites, dominated by the interaction between anchoring groups and solvation chains. As a result, the electrophoretic mobility of TiO could be tuned between -8.09 × 10 and +2.26 × 10 m V s. Due to the increased particle charge, TiO particles could be well dispersed in Isopar L with the assistance of S17000, T151 and T154. A black-white dual particle electrophoretic system with 2.0% (w/v) S17000 was constructed to obtain EPD devices. The EPD device gained a maximum white-and-black-state reflectivity of 41.79%/0.56% and a peak contrast ratio of 74.15. Its response time could be reduced to as low as 166.7 ms, which outperforms the majority of other black-white EPD devices.
电泳显示器（EPD）因其对眼睛友好、环保和双稳态等特性，作为信息显示的潜在候选者而备受关注。然而，其响应速度与电泳粒子的充电行为密切相关，在实际应用中仍显不足。在此，使用了五种基本表面活性剂来调节非极性介质异链烷烃L中二氧化钛（TiO）颗粒的电荷。颗粒电荷与表面位点上有效的表面活性剂覆盖率密切相关，这主要由锚定基团和溶剂化链之间的相互作用决定。结果，TiO的电泳迁移率可在 -8.09×10 和 +2.26×10 m V s之间调节。由于颗粒电荷增加，在S17000、T151和T154的辅助下，TiO颗粒能够很好地分散在异链烷烃L中。构建了一个含2.0%（w/v）S17000的黑白双颗粒电泳系统以获得EPD器件。该EPD器件的最大白态和黑态反射率分别为41.79%/0.56%，峰值对比度为74.15。其响应时间可缩短至低至166.7 ms，优于大多数其他黑白EPD器件。
