Dainton Building, Department of Chemistry, The University of Sheffield, Brook Hill, Sheffield, S3 7HF, United Kingdom.
J Am Chem Soc. 2010 Feb 24;132(7):2166-8. doi: 10.1021/ja910139a.
Addition of excess sterically stabilized P2VP latex to a colloidal dispersion of P2VP-silica nanocomposite particles (with silica shells at full monolayer coverage) leads to the facile redistribution of the silica nanoparticles such that partial coverage of all the P2VP latex particles is achieved. This silica exchange, which is complete within 1 h at 20 degrees C as judged by small-angle x-ray scattering, is observed for nanocomposite particles prepared by heteroflocculation, but not for nanocomposite particles prepared by in situ copolymerization. These observations are expected to have important implications for the optimization of nanocomposite formulations in the coatings industry.
向 P2VP-二氧化硅纳米复合材料颗粒（二氧化硅壳层完全单层覆盖）的胶体分散体中添加过量的空间位阻稳定的 P2VP 胶乳，可轻易地重新分配二氧化硅纳米颗粒，从而实现对所有 P2VP 胶乳颗粒的部分覆盖。通过小角 X 射线散射判断，在 20°C 下 1 小时内即可完成这种二氧化硅交换，这一现象可观察到通过杂凝制备的纳米复合材料颗粒中，但在通过原位共聚制备的纳米复合材料颗粒中则观察不到。这些观察结果有望对涂料工业中优化纳米复合材料配方产生重要影响。
