Synthesis and utilization of monodisperse hollow polymeric particles in photonic crystals.
Synthesis and utilization of monodisperse hollow polymeric particles in photonic crystals.
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DOI：
10.1021/ja049453k
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发表时间：
2004-06
影响因子：
15
通讯作者：
Xiangling Xu;S. Asher
中科院分区：
文献类型：
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作者：
Xiangling Xu;S. Asher
我们开发了一种制备具有100 - 500 nm中空核的150 - 700 nm单分散聚合物颗粒的方法。通过分散聚合法在单分散SiO2颗粒周围合成聚合物壳层，制备了中空SiO2颗粒。然后通过HF蚀刻去除SiO（2）核以产生单分散中空聚合物颗粒壳。中空核尺寸和聚合物壳厚度可以在显著的尺寸范围内容易地变化。这些中空聚合物颗粒是充分单分散的，使得在从乙醇中离心时，它们形成良好有序的紧密堆积的胶体晶体，其吸收光。在表面用磺酸盐官能化后，这些颗粒在去离子水中自组装成结晶胶体阵列。这种合成方法也可用于产生具有复杂和不寻常形态的单分散颗粒。例如，我们合成了含有两个同心独立的球形聚合物壳的中空颗粒，以及含有中心球形二氧化硅核的中空二氧化硅颗粒。此外，这些空心球可用作模板微反应器。例如，我们能够制造单分散聚合物球，其含有通过在中空核内直接沉淀形成的高浓度磁性纳米球。
We developed a process to fabricate 150-700 nm monodisperse polymer particles with 100-500 nm hollow cores. These hollow particles were fabricated via dispersion polymerization to synthesize a polymer shell around monodisperse SiO(2) particles. The SiO(2) cores were then removed by HF etching to produce monodisperse hollow polymeric particle shells. The hollow core size and the polymer shell thickness, can be easily varied over significant size ranges. These hollow polymeric particles are sufficiently monodisperse that upon centrifugation from ethanol they form well-ordered close-packed colloidal crystals that diffract light. After the surfaces are functionalized with sulfonates, these particles self-assemble into crystalline colloidal arrays in deionized water. This synthetic method can also be used to create monodisperse particles with complex and unusual morphologies. For example, we synthesized hollow particles containing two concentric-independent, spherical polymer shells, and hollow silica particles which contain a central spherical silica core. In addition, these hollow spheres can be used as template microreactors. For example, we were able to fabricate monodisperse polymer spheres containing high concentrations of magnetic nanospheres formed by direct precipitation within the hollow cores.