ELECTROSTATICALLY SUPPORTED MIXING OF FINE GRAINED PARTICLES |
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作者姓名: | K.-E.Wirth M.Linsenbuehler |
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作者单位: | InstituteofParticleTechnology,UniversityofErlangen-Nuremberg,D-91058Erlangen,Germany |
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摘 要: | 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 mixtu.res 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.
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关 键 词: | 颗粒物质 带电纳米粒子 悬浮液 混合方法 范德瓦尔斯引力 |
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