近日，华南师范大学周国富团队研究了具有高电荷质量比的电泳显示用彩色聚合物增强金属有机骨架微粒子。相关论文于2026年2月24日发表在《光：科学与应用》杂志上。

金属有机框架材料除了具有高孔隙率和结构可控性外，在彩色电泳粒子方面还具有一些天然优势：易于修饰、形貌可控、密度低且可调、电荷密度高，以及丰富、鲜艳且稳定的颜色。因此，研究组首次将四种颜色的MOF微粒与聚电解质结合，制备出蓝色、红棕色、绿色和紫色电泳粒子，进而在非极性异十二烷中构建了稳定的双色分散体系作为电泳墨水。其中，基于非共价相互作用的聚乙烯亚胺（PEI）链表面修饰使得这些MOF微粒的Zeta电位充分增强至约+30 mV，电泳迁移率超过3.6 × 10^-10 m² V^-1 s^-1。

在0.02 V μm^-1的超低场强下，响应时间和恢复时间分别不超过2.3秒和5.9秒。即使经过长时间或多重驱动，这些MOF微粒及其反射率值仍能在一定程度上保持恒定。相比之下，这些彩色PEI增强MOF微粒在响应能力、荷质比、制备方法、生产成本以及颜色、颗粒和显示稳定性方面均优于其他有机彩色颜料和无机颗粒。这有望为彩色电泳显示提供一条创新且有前景的技术路径。

附：英文原文

Title: Colored polymer-reinforced metal-organic framework microparticles with high charge-to-mass ratio for electrophoretic display

Author: Cheng, Jiamin, Qin, Mian, Wang, Wenhao, Zhang, Jingxing, Wang, Yao, Bai, Pengfei, Li, Hao, Zhou, Guofu

Issue&Volume: 2026-02-24

Abstract: Besides high porosity and controllable structure, metal-organic framework (MOF) has some natural advantages for color electrophoretic particles: easy modification, controllable morphology, low and adjustable density, and high charge density, as well as rich, vivid, and stable colors. Therefore, we first integrated the four colored MOF microparticles and polyelectrolytes into the blue, reddish-brown, green, and purple electrophoretic particles to construct the two-color stable dispersions in nonpolar isododecane as the electrophoretic inks. Here, the surface modification of polyethyleneimine (PEI) chains based on non-covalent interaction rendered these MOF microparticles fully reinforced to ~+30 mV in Zeta potential and over 3.6 × 1010 m2 V1 s1 in the electrophoretic mobility. Under the ultralow field strength of 0.02V μm1, all the response time and recovery time were no more than 2.3 and 5.9s, respectively. Even after long-time or multiple driving, these MOF microparticles and their reflectance value still remained constant to some extent. By comparison, these colored PEI-reinforced MOF microparticles are superior to the other organic color pigments and inorganic particles, in response capability, charge-to-mass ratio, preparation method, production cost, and stability in color, particle, and display. It is anticipated to provide an innovative and promising technical path for color electrophoresis display.

DOI: 10.1038/s41377-025-02095-3

Source: https://www.nature.com/articles/s41377-025-02095-3