Hybrid dissymmetrical colloidal particles
Hybrid dissymmetrical colloidal particles
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DOI：
10.1021/cm050406g
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发表时间：
2005-06-28
影响因子：
8.6
通讯作者：
Ravaine, S
中科院分区：
文献类型：
--
作者：
Reculusa, S;Poncet-Legrand, C;Ravaine, S
通过种子乳液聚合工艺合成了结合有机和无机部分的具有受控形态的胶体颗粒。首先通过吸附氧乙烯基大分子单体或共价接枝三烷氧基硅烷衍生物对50至150mn的二氧化硅种子颗粒进行表面改性。然后，在这些颗粒的存在下进行苯乙烯的乳液聚合，在这种条件下，非常有利于在二氧化硅表面形成聚苯乙烯结节。在改变不同的实验参数时，我们证明了二氧化硅种子数量与生长结节数量之间的比率是控制最终混合纳米颗粒形态的关键参数。例如，在该比率接近1的特定情况下，获得哑铃状或雪人状颗粒。还成功测试了其二氧化硅部分的进一步选择性表面修饰，表明这些杂化颗粒作为超颗粒组件的原始构建块的潜在应用。
Colloidal particles with a controlled morphology combining both organic and inorganic parts were synthesized through a seeded emulsion polymerization process. Silica seed particles from 50 to 150 mn were first surface-modified by adsorption of an oxyethylene-based macromonomer or covalent grafting of a trialkoxysilane derivative. Then, emulsion polymerization of styrene was carried out in the presence of these particles, the formation of polystyrene nodules being highly favored at the silica surface in such conditions. While varying different experimental parameters, we have demonstrated that the ratio between the number of silica seeds and the number of growing nodules is a key parameter in controlling the morphology of the final hybrid nanoparticles. For instance, in the particular case when this ratio was close to 1, dumbbell-like or snowman-like particles were obtained. Further selective surface modification of their silica moiety was also tested successfully, indicating a potential application of these hybrid particles as original building blocks toward supraparticulate assemblies.