Asymmetrically modified silica particles: A simple particulate surfactant for stabilization of oil droplets in water
Asymmetrically modified silica particles: A simple particulate surfactant for stabilization of oil droplets in water
复制标题
DOI：
10.1021/ja043581r
复制
发表时间：
2005-05-04
影响因子：
15
通讯作者：
Ohtani, B
中科院分区：
文献类型：
--
作者：
Takahara, YK;Ikeda, S;Ohtani, B
通过用烷基甲硅烷基化剂部分修饰其表面羟基，制备了能够在水和不混溶有机溶剂的双相混合物的相界处组装的球形二氧化硅颗粒。对这些颗粒进行扫描电子显微镜观察，其中剩余的表面羟基已被胶体金颗粒选择性修饰，结果表明每个颗粒都具有不对称的表面结构：表面的一侧是亲水性的，另一侧是疏水性的。我们发现，在甲苯/聚苯乙烯混合物的有机溶液存在下，这些颗粒可以在水中形成胶束结构。胶束结构通过形成高尔夫球状聚苯乙烯颗粒来证明，该颗粒具有凹痕印记改性二氧化硅颗粒疏水部分的形态。
Spherical silica particles that are able to assemble at a phase boundary of a dual-phase mixture of water and an immiscible organic solvent were prepared by a partial modification of their surface hydroxyl groups with an alkylsilylation agent. Scanning electron microscopic observation of these particles in which their remaining surface hydroxyl groups had been selectively modified with colloidal gold particles revealed that each particle has an asymmetric surface structure: one side of the surface is hydrophilic and the other is hydrophobic. We found that these particles could form a micellar structure in water in the presence of an organic solution of a toluene/polystyrene mixture. The micellar structure was evidenced by formation of golf-ball-like polystyrene particles with dimples imprinting morphologies of the hydrophobic part of modified silica particles.