Scalable gas-phase processes to create nanostructured particles--颗粒学报PARTICUOLOGY

van Ommen, J. R., Yurteri, C. U., Ellis, N., & Kelder, E. M. (2010). Scalable gas-phase processes to create nanostructured particles. Particuology, 8(6), 572-577. https://doi.org/10.1016/j.partic.2010.07.010

Scalable gas-phase processes to create nanostructured particles

J. Ruud van Ommen ^a *, Caner U. Yurteri ^a, Naoko Ellis ^b, Erik M. Kelder ^a

a Delft University of Technology, Department of Chemical Engineering, Julianalaan 136, 2628 BL Delft, The Netherlands
b University of British Columbia, Department of Chemical and Biological Engineering, 2360 East Mall, Vancouver, B.C., Canada V6T 1Z3

10.1016/j.partic.2010.07.010

Volume 8, Issue 6, December 2010, Pages 572-577

Received 25 May 2010, Accepted 25 July 2010, Available online 30 October 2010.

E-mail: j.r.vanommen@tudelft.nl

Highlights

Abstract

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.

Graphical abstract

Keywords

Nanoparticles; Nanocomposite materials; Coating; Films; Particle coating; Atomic layer deposition; Core–shell particles; Electrospraying; Electrohydrodynamic atomization; Electrostatic forces; Fluidization

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