Electrostatically supported mixing of fine grained particles--颗粒学报PARTICUOLOGY

Wirth, K. E., & Linsenbühler, M. (2005). Electrostatically supported mixing of fine grained particles. China Particuology, 3(1), 94-98. https://doi.org/10.1016/S1672-2515(07)60174-2

Electrostatically supported mixing of fine grained particles

K.-E. Wirth ^*, M. Linsenbühler

Institute of Particle Technology, University of Erlangen-Nuremberg, D-91058 Erlangen, Germany

10.1016/S1672-2515(07)60174-2

Volume 3, Issues 1–2, April 2005, Pages 94-98

Received 25 February 2005, Accepted 14 March 2005, Available online 14 December 2007.

E-mail: sekretariat@lfg.uni-erlangen.de

Highlights

Abstract

The processing of fine-grained particles with diameters between 1 and 10 microns is difficult due to strong van-der-Waals attraction forces. In order to improve the handling properties, the fine-grained particles, i.e. host-particles, are coated with various nanoparticles, i.e. guest-particles. The mixing of fine-grained powders is influenced by particle-particle interactions. If these forces are distinctively used, both interactive and ordered mixtures can be produced. These particle mixtures consist of composite-particles that have new physical properties. These modified properties depend strongly on the coating process, the diameter- and mass-relationship of the guest- and the host-particles. The properties of the composite-particles can systematically be adjusted to the requirements of industrial applications. For example, a laboratory bubbling fluidized bed can be used to describe the conveying behavior of the functionalized host-particles. Applications for the functionalized particles are in the pharmaceutical and the powder coating industries, e.g. enhanced dry powder inhalers and thin lacquer films. The present research compares three different mixing/coating processes. The composite-particles are characterized by TEM, SEM and with their fluidization characteristics. The coating process itself is monitored by the electrostatic charge of the particles.

Graphical abstract

Keywords

mixing; granular matter; charged nanoparticles; powders; suspensions

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