Micro continuous flow-through synthesis of triangular silver nanoprisms and their incorporation in complexly composed polymer microparticles
Micro continuous flow-through synthesis of triangular silver nanoprisms and their incorporation in complexly composed polymer microparticles
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DOI：
10.1016/j.cej.2012.07.041
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发表时间：
2013-07-01
影响因子：
15.1
通讯作者：
Koehler, J. Michael
中科院分区：
文献类型：
--
作者：
Knauer, Andrea;Csaki, Andrea;Koehler, J. Michael
微流体段技术用于通过在水溶液中用硼氢化钠还原银离子来连续流动合成小银纳米粒子，并用于三角银纳米棱柱的生长。结果，以非常高的产率和高均匀性获得了三角形纳米棱柱。通过选择合适的银盐溶液和种子纳米颗粒胶体溶液的流量比或不同的银盐浓度，可以轻松控制面内偶极子等离子体共振的调谐。金属纳米颗粒的胶体水溶液可用于制备与丙烯酰胺等水溶性单体的混合物，以及用于在基于液滴的光聚合过程中形成水凝胶-聚合物复合颗粒。除了球形复合颗粒外，通过水性丙烯酰胺反应混合物与丙烯酸酯基单体（二丙烯酸三丙二醇酯，TPGDA）混合物的嵌入液滴的组合光聚合，以微并流双排列的方式制备了具有亲水性纳米颗粒复合部分的Janus颗粒。由于蘑菇状颗粒的光散射和荧光行为，可以通过光学显微镜轻松区分其成分。 (C) 2012 Elsevier B.V. 保留所有权利。
The micro fluid segment technique is used for the continuous-flow synthesis for small silver nanoparticles by reduction of silver ions with sodium borohydride in aqueous solution and for the growth of triangular silver nanoprisms. In result, triangular nanoprisms are obtained in very high yield and high homogeneity. The tuning of the in-plane dipole plasmon resonance can easily be controlled by choosing suited flow rate ratios of silver salt solution and colloidal solution of seed nanoparticles or by different silver salt concentrations. The colloidal aqueous solutions of metal nanoparticles can be used for the preparation of mixtures with water-soluble monomers as acrylamide and for the formation of hydrogel-polymer composite particles in a droplet-based photopolymerization process. Beside spherical composite particles, Janus particles with a hydrophilic nanoparticle-containing composite part are prepared by a combined photopolymerization of the aqueous acrylamide reaction mixture together with embedded droplets of an acrylate-based monomer (Tripropylene Glycol Diacrylate, TPGDA) mixture in a micro co-flow twin arrangement. The components of the mushroom-like particles can easily be distinguished by optical microscopy due to their light-scattering and fluorescence behavior. (C) 2012 Elsevier B.V. All rights reserved.