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Monodisperse Magnetic Silica Hexapods
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2018-06-28 , DOI: 10.1021/jacs.8b05128
Jae-Hyun Kim 1 , Hye Jeong Hwang 1 , Joon Suk Oh , Stefano Sacanna , Gi-Ra Yi 1
Affiliation  

A simple yet versatile solution-based process to produce colloidal silica hexapods is developed in which various shapes of silica rods are grown on the faces of cubes in a controlled manner. In the presence of hematite cubic particles, water droplets nucleate on the surface of hematite by phase separation in pentanol. By adjusting the water concentration, six droplets can form on each face of the hematite cube. A silica precursor is then administered into the system, which gradually diffuses into the water droplets through the oil phase. Within the droplets, hydrolysis and condensation of the precursors take place, leading to formation of silica rods. As a result, silica hexapods on a magnetic hematite cubic seed are produced. Furthermore, when the emulsions are aged at 60 °C prior to the silica growth, the water content in the solution decreases gradually due to evaporation and spiky sharp hexapods are produced. On the other hand, when organosilane precursor is added, pancake-like hexapods are formed due to the reduction of interfacial tension. These colloidal hexapods can further be utilized as new building blocks for self-assembly to construct functional materials or as a model system to understand collective behaviors.

中文翻译:

单分散磁性二氧化硅六足体

开发了一种简单而通用的基于溶液的生产胶体二氧化硅六足体的过程,其中以受控方式在立方体的表面上生长各种形状的二氧化硅棒。在赤铁矿立方颗粒的存在下,水滴通过戊醇中的相分离在赤铁矿表面成核。通过调节水的浓度,可以在赤铁矿立方体的每个面上形成六个液滴。然后将二氧化硅前体加入系统中,然后通过油相逐渐扩散到水滴中。在液滴内,前体发生水解和缩合,导致形成二氧化硅棒。结果,产生了磁性赤铁矿立方晶种上的二氧化硅六足体。此外,当乳液在二氧化硅生长之前在 60 °C 下老化时,由于蒸发,溶液中的水含量逐渐减少,并产生尖尖的六足动物。另一方面,当加入有机硅烷前体时,由于界面张力的降低,形成了薄饼状的六足体。这些胶体六足体可以进一步用作自组装的新构建块来构建功能材料或作为模型系统来理解集体行为。
更新日期:2018-06-28
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