Wang Huanhuan, Yang Shengyang, Yin Su-Na, Chen Li, Chen Su
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing 210009, P. R. China.
ACS Appl Mater Interfaces. 2015 Apr 29;7(16):8827-33. doi: 10.1021/acsami.5b01436. Epub 2015 Apr 15.
The design and development of Janus suprabeads (JSs) with multiple responses are highly desirable in the fabrication of functional nanomaterials. In this work, we report a triphase microfluidic strategy for the construction of JSs with temperature-magnetism-optics triple responses. Initially, macromonomer poly(methacrylic acid) (PMAA) obtained via catalytic chain transfer polymerization (CCTP) was grafted onto the polystyrene (PS) colloidal photonic crystals (CPCs) surface. Because abundant carboxylic acid groups in PMAA could coordinate cadmium ions for in situ production of fluorescent CdS quantum dots (QDs) after introducing sulfur ions, the as-prepared JSs were endowed with favorable optical properties. Meanwhile, the as-prepared Cd(2+)/PS CPCs were employed as a template to build JSs with temperature-magnetism sensitivity via the introduction of magnetic Fe3O4 and hydrogels. Finally, the fluorescence pattern was easily performed by using chalcogenides as "ink" to write on the pad, in which in situ reaction mechanism was involved in the response. The multiple responsive JSs show promising applications in sensor, display, and anticounterfeit fields.
在功能纳米材料的制备中，非常需要设计和开发具有多种响应的Janus超珠子（JSs）。在这项工作中，我们报告了一种用于构建具有温度 - 磁性 - 光学三重响应的JSs的三相微流控策略。首先，通过催化链转移聚合（CCTP）获得的大分子单体聚（甲基丙烯酸）（PMAA）接枝到聚苯乙烯（PS）胶体光子晶体（CPCs）表面。由于PMAA中丰富的羧酸基团在引入硫离子后可以与镉离子配位以原位生成荧光CdS量子点（QDs），所制备的JSs具有良好的光学性质。同时，通过引入磁性Fe3O4和水凝胶，将所制备的Cd(2+)/PS CPCs用作模板来构建具有温度 - 磁性敏感性的JSs。最后，通过使用硫族化物作为“墨水”在垫上书写来轻松实现荧光图案，其中原位反应机制参与了响应。这种具有多种响应的JSs在传感器、显示和防伪领域显示出有前景的应用。
