Cationic Spherical Polyelectrolyte Brushes as Nanoreactors for the Generation of Gold Particles
Cationic Spherical Polyelectrolyte Brushes as Nanoreactors for the Generation of Gold Particles
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DOI：
10.1002/marc.200300107
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发表时间：
2004-02
影响因子：
4.6
通讯作者：
Geeta K. Sharma;M. Ballauff
中科院分区：
文献类型：
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作者：
Geeta K. Sharma;M. Ballauff
如果长链紧密地附着在胶态乳胶颗粒上，就会形成球形的乳胶刷。这些球形聚电解质分散在水中并携带高电荷。我们证明，这些系统可用于重金属离子，如金，作为反离子。这些离子的还原导致金属纳米颗粒。以这种方式，附着到颗粒表面的刷层成为可以用于金属离子的化学转化的纳米反应器。我们表明，这些纳米反应器内的AuCl - 4离子的还原导致连接到核心表面的定义明确且相当单分散的金纳米颗粒。得到具有附着的纳米颗粒的聚合物芯颗粒的稳定分散体。所有的结果表明，固定在球形刷的离子的化学反应提供了一个新的途径，无机和有机材料的复合粒子。
If long polyelectrolyte chains are attached densely to colloidal latex particles, a spherical polyelectrolyte brush results. These spherical polyelectrolytes are dispersed in water and carry a high charge. We demonstrate that these systems can be used to immobilize ions of heavy metals, such as gold, as counter-ions. Reduction of these ions leads to metallic nanoparticles. In this way the brush layer attached to the surface of the particles becomes a nanoreactor that may be used for chemical conversions of the metal ions. We show that the reduction of AuCl - 4 ions within these nanoreactors leads to well-defined and rather monodisperse gold nanoparticles that are attached to the surface of the core. A stable dispersion of polymeric core particles with attached nanoparticles results. All results reported here suggest that chemical reactions of ions immobilized in spherical polyelectrolyte brushes provide a new route to composite particles of inorganic and organic materials.