中国科学院化学所刘冰团队报道了同步聚合、自组装和定向附着的液晶纳米棒用于磁响应显示器。相关研究成果于2024年12月23日发表在《德国应用化学》。

通过聚合和/或自组装（SA）制备各向异性纳米粒子（NPs），显著促进了聚合物纳米材料在许多领域的应用。然而，聚合物纳米棒不易通过传统聚合或SA获得。

该文中，研究人员报告了一种利用定向附着（OA），合成单畴近晶液晶（LC）纳米棒的一步法，该方法通常在无机NPs的合成中使用，与聚合和SA同步。通过开发一种源自热响应聚电解质系统的新型稳定剂来实现同步。

机理研究表明，控制NPs上的热响应行为和稳定剂的分布可以实现OA。LC纳米棒可以进一步形成分层胶体LCs，其透光率比非LC纳米棒大得多。此外，研究人员证明了这种LC系统可以被外部磁场操纵，从而为磁响应显示器提供了一种候选材料。

附：英文原文

Title: Liquid Crystalline Nanorods by Synchronized Polymerization, Self-Assembly and Oriented Attachment for Utilization in Magnetically Responsive Displays

Author: Xiao Wang, Jiawei Lu, An-Chang Shi, Bing Liu

Issue&Volume: 2024-12-23

Abstract: The creation of anisotropic nanoparticles (NPs) by polymerization and/or self-assembly (SA) has significantly promoted the applications of polymer nanomaterials in many fields. However, polymer nanorods are not easily accessible via conventional polymerization or SA. Here we report a one-step route to synthesize single-domain smectic liquid crystalline (LC) nanorods utilizing oriented attachment (OA) that was usually found in the synthesis of inorganic NPs, synchronized with polymerization and SA. The synchronization was achieved by developing a novel stabilizer derived from a thermo-responsive polyelectrolyte system. Mechanistic studies reveal that controlling the thermo-responsive behavior and the distribution of stabilizers on NPs enabled OA. The LC nanorods can further form hierarchical colloidal LCs, which show much larger light transmittance than that of non-LC nanorods. Moreover, we demonstrate that this LC system can be manipulated by an external magnetic field, thus providing a candidate material for magnetic-responsive display.

DOI: 10.1002/anie.202419042

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202419042