School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, PR China.
Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, PR China.
J Colloid Interface Sci. 2018 Aug 15;524:289-296. doi: 10.1016/j.jcis.2018.03.101. Epub 2018 Mar 30.
Amphiphilic block copolymers are able to assemble into spherical micelles in an aqueous solution. Spherical micelles are expected to adsorb on the surface of colloidal nanoparticles (NPs) through hydrogen-bonding interaction. Hence, it should be possible to guide the area-selective deposition of precursors onto the exposed surface of colloidal seeds, where no micelles are adsorbed. Using colloidal silica and polydopamine nanospheres as seeds, block copolymer F127 and P123 are used as surface modifiers to guide the controlled solution-phase deposition of precursors on a selectively exposed surface of seed NPs, leading to the formation of patchy NPs. Effects of the addition amount of tetraethoxysilane (TEOS), types of block copolymers, and the volume fraction of miscible organic solvents on the size and morphology of patchy silica NPs are investigated systematically through electron microscopic imaging. Block copolymer micelles adsorption model for the formation of colloidal patchy NPs is first proposed. Our study suggests that the shape and size of patchy silica NPs are determined by the amount of TEOS and dielectric constant of solution.
两亲嵌段共聚物能够在水溶液中自组装成球形胶束。球形胶束有望通过氢键相互作用吸附在胶体纳米颗粒（NPs）的表面上。因此，应该有可能引导前体在胶体种子的暴露表面上进行选择性区域沉积，在那里没有胶束被吸附。使用胶体二氧化硅和聚多巴胺纳米球作为种子，嵌段共聚物 F127 和 P123 被用作表面改性剂，以引导前体在种子 NPs 的选择性暴露表面上的受控溶液相沉积，从而形成有斑点的 NPs。通过电子显微镜成像系统研究了四乙氧基硅烷（TEOS）的添加量、嵌段共聚物的类型和可混有机溶剂的体积分数对有斑点的硅纳米颗粒的尺寸和形态的影响。首次提出了用于形成胶体有斑点 NPs 的嵌段共聚物胶束吸附模型。我们的研究表明，有斑点的硅纳米颗粒的形状和尺寸取决于 TEOS 的量和溶液的介电常数。
