Fabrication of Fine particles and Interaction between the Particles

在这项工作中，研究了一种新技术，可以将不同类型的胶体粒子组装成有序的多组分簇（超粒子）。在组装过程中，超粒子的大小和组成是通过将它们的成分聚集和限制在一个有限的胶体大小的空间来控制的。乳剂液滴用于提供其受限的空间。本研究采用的“组装-溶解”方案的基本原理如下。这个过程从乳胶或硅微球悬浮在水中开始。在此之后，系统中引入了乳状液滴作为油相。颗粒既可以吸附在液滴表面，也可以吸附在液滴体中。用一种适当的药剂将得到的有序的、由密集堆积的粒子组成的壳或球固定在一起。载体乳剂液滴随后通过加入介质相或增溶剂溶解。因此，最终产物是悬浮在水相中的超颗粒团簇。一种有趣的可能性是制造超粒子，其中包括超过一种胶体成分。我们将硫酸盐和酰胺类乳液或二氧化硅和酰胺类乳液的组装方案结合起来，组装了复合颗粒。这些复合颗粒是由聚集的酰胺微球组成的核，周围是硫酸盐或二氧化硅颗粒的外壳。这个过程首先包括从辛醇滴内的氨基链形成球状聚集体。然后我们用该方法在液滴表面形成硫酸盐或二氧化硅乳胶壳。

In this work, a novel technique, that allows the assembly of different types of colloid particles into ordered multicomponent clusters(suparaparticles) has been investigated. The size and the composition of the superparticle during their assembly are controlled by gathering and confining their components in a restricted, colloid size space. Emulsion droplets are used to provide their restricted apace.The basic principle of the "assembl-and dissolution" scheme used in this study are as follows. The process starts with a suspension of latex or silica microspheres in water. Emulsion drops as the oily phase are introduced after that in the system. The particles could be adsorbed either on the droplet surface or in the their bulk. The obtained ordered shells or balls of densely packed particles are fixed together by an appropriate agent. The carrier emulsion droplets are later dissolved by adding of a mediator phase or solubilizing agent. Thus the final product is supraparticle clusters resuspended in the water phase.One interesting possibility is the fabrication of supraparticles including more than on colloid components. We have assembled composite particles by using both the sulfate and amidine latices or silica and amidine latices by combining their assembly schemes. These composite particles consisted of a core of aggregated amidine microsphers surrounded by the shell of sulfate latices or silica particles. The process first included the formation of ball-like aggregates from the amidine latices inside the octanol droplets. We then used the method for formation of sulfate or silica latex shell on the droplet surfaces.