γ辐照引发无皂乳液聚合法一步合成Ag-聚4-乙烯基吡啶杂化微凝胶

(Silver-poly(4-vinylpyridine))(Ag-P4VP) hybrid microgels were synthesized by γ-irradiation and surfactant-free emulsion polymerization in a single step.The effects of dose rate and the concentrations of isopropanol,silver ion,N,N′-methylenebisacrylamide(Bis) and 4-vinylpyridine(4-VP) on the hybrid microgels were studied in detail via transmission electron microscopy(TEM),powder X-ray diffraction(XRD) or dynamic light scattering(DLS).The results indicated that the size of Ag nanoparticles in the hybrid microgels increased with the increase of Ag^+ or Bis concentration and with the decrease of dose rate or isopropanol concentration.When the dose rate was decreased,the phase state of Ag nanoparticles was gradually transformed from amorphous state to cubic crystalline state.Although the variety of the P4VP microgels’ size was more complex,it could also be easily adjusted by the above-mentioned conditions.

载金或银纳米粒子智能杂化微凝胶的合成、性能及其应用

载金或银等贵金属纳米粒子(NMNPs)智能杂化微凝胶是一类结合了NMNPs和智能微凝胶两者独特性能的先进功能材料,其最大特点是可通过外界刺激来调节NMNPs的多种性能,或通过测定其性能变化来感知外界刺激。本文从形态结构的角度将已报道的载金或银纳米粒子智能杂化微凝胶分为四类:无规充填型、核壳结构型、表面覆盖型和夹层结构型,分别介绍了它们各自的特点和主要的合成方法。综述了这类智能杂化微凝胶的结构与组成的主要表征方法,以及它们的刺激响应性、可调的局域表面等离子体共振光学性能、表面电场增强效应与荧光性能等。评述了载金或银纳米粒子智能杂化微凝胶在智能微反应器、微传感器、表面增强拉曼光谱基底、药物输送载体和生物成像等方面的应用研究进展。最后,对该类微凝胶的研究方向和发展前景作了展望。