Double-responsive polyampholyte as a nanoparticle stabilizer: application to reversible dispersion of gold nanoparticles
Double-responsive polyampholyte as a nanoparticle stabilizer: application to reversible dispersion of gold nanoparticles
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DOI：
10.1039/c0jm00255k
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发表时间：
2010-05
影响因子：
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通讯作者：
Shenghai Li;Yuntao Wu;Junhua Wang;Qiang Zhang;Y. Kou;Suobo Zhang
中科院分区：
文献类型：
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作者：
Shenghai Li;Yuntao Wu;Junhua Wang;Qiang Zhang;Y. Kou;Suobo Zhang
在pH和溶剂响应的水溶性多两性聚合物（SPES）上支撑了一个小于4 nm且尺寸分布窄的水溶性耐用金纳米团簇。合成的Au@SPES杂化物具有明显的pH和溶剂敏感性，并在水溶液中随pH和溶剂变化表现出沉淀行为。此外，根据聚两性聚合物的ph敏感性，回收的催化剂可以通过简单的程序再溶解在水中重复使用。通过使用这种催化剂，醇的好氧氧化应该能够以均匀的方式进行，因此可能产生与均相母体系统相似的催化活性和选择性。稳定spe的金纳米团簇的相分离和灵敏度允许团簇从反应混合物中轻松分离而没有任何负聚集。
Water-soluble and durable Au nanoclusters, smaller than 4 nm with a narrow size distribution, were supported on a pH- and solvent-responsive water-soluble polyampholyte (SPES). Such synthesized Au@SPES hybrids possessed clear pH- and solvent-sensitive properties, and exhibited precipitation behaviors in response to pH and solvent changes in aqueous solution. Furthermore, the recycled catalyst could be redissolved in water for reuse via simple procedures based on the pH-sensitivity of the polyampholyte. By employing such catalysts, aerobic oxidation of alcohols should be able to be carried out in a homogeneous manner and may thus give rise to similar catalytic activities and selectivities as the homogeneous parent system. The phase separation and sensitivity of the SPES-stabilizing Au nanoclusters permitted a facile separation of the clusters from the reaction mixture without any negative aggregation.