Scalable gas-phase processes to create nanostructured particles

作     者：J.Ruud van Ommen Caner U.Yurteri Naoko Ellis Erik M.Kelder 

作者机构：Delft University of TechnologyDepartment of Chemical EngineeringJulianalaan 1362628 BL DelftThe Netherlands University of British ColumbiaDepartment of Chemical and Biological Engineering2360 East MallVancouverB.C.Canada V6T 1Z3 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2010年第8卷第6期

页      面：572-577页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

主　　题：Nanoparticles Nanocomposite materials Coating Films Particle coating Atomic layer deposition Core shell particles Electrospraying Electrohydrodynamic atomization Electrostatic forces Fluidization 

摘      要：The properties of nanoparticles are often different from those of larger grains of the same solid material because of their very large specific surface area. This enables many novel applications, but properties such as agglomeration can also hinder their potential use. By creating nanostructured particles one can take optimum benefit from the desired properties while minimizing the adverse effects. We aim at developing high-precision routes for scalable production of nanostructured particles. Two gas-phase synthesis routes are explored. The first one - covering nanoparticles with a continuous layer - is carried out using atomic layer deposition in a fluidized bed. Through fluidization, the full surface area of the nanoparticles becomes available. With this process, particles can be coated with an ultra-thin film of constant and well-tunable thickness. For the second route - attaching nanoparticles to larger particles - a novel approach using electrostatic forces is demonstrated. The micron-sized particles are charged with one polarity using tribocharging. Using electrospraying, a spray of charged nanoparticles with opposite polarity is generated. Their charge prevents agglomeration, while it enhances efficient deposition at the surface of the host particle. While the proposed processes offer good potential for scale-up, further work is needed to realize large-scale processes.