Abstract
Powder and fine particles are commonly used in industrial applications such as the preparation of food, pharmaceutical products and materials of electronic devices. The physical and chemical properties of powder particles strongly influence the characteristics of products prepared in powder processes. Therefore, the control of particle morphology, shape and size distribution gives us significant advantages in adding a new function to the products.
Bottom-up technology such as crystallization and sol-gel methods is often used for controlling particle properties in such fabrication processes. Recently, particle synthesis in confined spaces has attracted attention like a micro-reactor because it has large interfacial area per unit volume, controllable residence time of the fluid by changing the channel length and operation at low Reynolds numbers. Then, the confined space becomes a reaction field with relative uniform and rapid changing from circumstance. In this paper, our works concerning particle synthesis in the confined space are introduced. Spherical amino acid and titanium oxide particles were fabricated in an atomization crystallization process based on liquid-liquid interfacial diffusion. Composite particle synthesis was performed in a coaxial tube reactor controlled the fluid pattern.
