控制胶体超微粒的屈曲

Lukas J. Roemling, Gaia De Angelis, Annika Mauch, Esther Amstad, Nicolas Vogel
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引用次数: 0

摘要

胶体粒子群通常被称为超粒子,它们可以提供比单个粒子更多的功能。由于这些功能是由超微粒内部主要粒子的排列决定的,因此控制结构的形成过程至关重要。在这里,我们展示了降伏是如何由粒子与表面活性剂的相互作用决定的,以及如何通过及时操纵这些相互作用来控制所形成的超微粒子的最终形态。我们利用水/油乳液作为超微粒子形成的模板,并通过水滴内的局部 pH 值调整带负电荷胶体粒子与稳定水/油界面的表面活性剂之间的相互作用。在低 pH 值条件下,表面活性剂阴离子头基的质子化会降低颗粒的静电排斥力,促进界面吸附,进而导致降伏。我们发现,在组装过程中,水相的局部 pH 值会不断变化。我们通过控制初始 pH 值来确定界面吸附的时间点,从而获得对形成途径的控制。因此,最终的超微粒形态可以随意定制,从完全屈曲的结构、起伏的表面形态到球形粗糙和球形光滑的超微粒以及结晶胶体团簇。
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Control of Buckling of Colloidal Supraparticles
Clusters of colloidal particles, often termed supraparticles, can provide more functionality than the individual particles they consist of. Since these functionalities are determined by the arrangement of the primary particles within a supraparticle, controlling the structure formation process is of fundamental importance. Here, we show how buckling is determined by particle-surfactant interactions and how the final morphology of the formed supraparticles can be controlled by manipulating these interactions in time. We use water/oil emulsions to template supraparticle formation and tailor the interactions of negatively charged colloidal particles with the surfactants stabilizing the water/oil-interface via the local pH within the aqueous droplet. At low pH, protonation of the anionic headgroup of the surfactant decreases electrostatic repulsion of the particles, facilitates interfacial adsorption, and subsequently causes buckling. We show that the local pH of the aqueous phase continuously changes during the assembly process. We gain control over the formation pathway by determining the point in time when interfacial adsorption is enabled, which we control via the initial pH. As a consequence, the final supraparticle morphology can be tailored at will, from fully buckled structures, via undulated surface morphologies to spherically rough and spherically smooth supraparticles and crystalline colloidal clusters.
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