Colloidal Crystals of Thermosensitive, Core/Shell Hybrid Microgels
Colloidal Crystals of Thermosensitive, Core/Shell Hybrid Microgels
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DOI：
10.1021/jp068535n
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发表时间：
2007-03
影响因子：
3.7
通讯作者：
D. Suzuki;Jonathan G. McGrath;Haruma Kawaguchi;L. Andrew Lyon
中科院分区：
文献类型：
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作者：
D. Suzuki;Jonathan G. McGrath;Haruma Kawaguchi;L. Andrew Lyon
我们展示了由各种热敏核/壳微凝胶组成的胶体晶体的组装，以及它们的杂化微凝胶对应物，其中含有局部的金纳米颗粒。为了得到纳米结构的微凝胶，我们进行了三个阶段的聚合。首先，采用沉淀聚合法制备交联聚n -异丙基丙烯酰胺（pNIPAm）芯微凝胶；将这些微凝胶作为核心或“种子”，使用功能共聚物将pNIPAm的共聚物壳添加到这些核心颗粒中。最后，利用这种种子聚合技术，将仅由交联pNIPAm组成的第二壳层添加到预成型的核/壳微凝胶上。以这些核/壳/壳微凝胶为模板，利用内壳中的阳离子位置原位合成了金纳米颗粒。为了控制金纳米粒子的光学性能，将预先制备好的金纳米粒子置于微孔中进行化学镀金。
We present the assembly of colloidal crystals composed of various thermoresponsive core/shell microgels and their hybrid microgel counterparts that contain localized Au nanoparticles. To obtain nanostructured microgels, we conducted a three-stage polymerization. First, core microgels composed of cross-linked poly(N-isopropylacrylamide) (pNIPAm) were synthesized by precipitation polymerization. Using these microgels as cores or “seeds”, a copolymer shell of pNIPAm was added to these core particles using a functional comonomer. Finally, a second shell consisting solely of cross-linked pNIPAm was added onto the preformed core/shell microgels by using this seeded polymerization technique. With use of these core/shell/shell microgels as templates, Au nanoparticles were synthesized in situ, using the cationic sites in the inner shell to nucleate particle growth. To control the optical properties of the Au nanoparticles, electroless Au plating was carried out with use of the preformed Au nanoparticles in the mic...