Thermo-sensitive colloidal crystals of silica spheres in the presence of large spheres with poly (N-isopropyl acrylamide) shells
Thermo-sensitive colloidal crystals of silica spheres in the presence of large spheres with poly (N-isopropyl acrylamide) shells
复制标题
DOI：
10.1007/s00396-006-1578-4
复制
发表时间：
2006-10
影响因子：
2.4
通讯作者：
T. Okubo;Taro Mizutani;J. Okamoto;Keisuke Kimura;A. Tsuchida;K. Tauer;V. Khrenov;H. Kawaguchi;Sakiko Tsuji
中科院分区：
文献类型：
--
作者：
T. Okubo;Taro Mizutani;J. Okamoto;Keisuke Kimura;A. Tsuchida;K. Tauer;V. Khrenov;H. Kawaguchi;Sakiko Tsuji
温敏胶体晶体的制备简单，通过混合胶体二氧化硅球和大的温敏凝胶球。单分散二氧化硅球（CS 82，直径103 nm）的胶体晶体的晶格间距的热可逆变化取决于混合的温度敏感的凝胶球的大小。对于尺寸小于和大于二氧化硅球的球，当温度升高到高于聚（N-异丙基丙烯酰胺）的下临界溶解温度时，晶格间距减小（参见图1）。Okubo等人，Langmuir 18：6783，2002）和增加。一个机制，这是能够解释这些实验结果，提出。此外，晶体生长速率和温度敏感的胶体晶体的刚度进行了研究。
Thermo-sensitive colloidal crystals are prepared simply by mixing colloidal silica spheres and large thermo-sensitive gel spheres. The thermo-reversible change in the lattice spacing of colloidal crystals of monodisperse silica spheres (CS82, 103 nm in diameter) depends on the size of the admixed temperature-sensitive gel spheres. For spheres with sizes less and greater than that of the silica spheres, the lattice spacing upon temperature increase above the lower critical solution temperature of poly(N-isopropyl acrylamide) decreases (cf. Okubo et al. Langmuir 18:6783, 2002) and increases, respectively. A mechanism, which is able to explain these experimental findings, is proposed. Moreover, crystal growth rates and the rigidities of the thermo-sensitive colloidal crystals are studied.