Nanomaterials as Flow Regulators in Dry Powders
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Ingfried Zimmermann
Abstract
From a physical point of view powders represent an intermediary state between solids and fluids. This holds especially with respect to their flow properties. Gravitational forces as well as interparticle forces are acting on particles in bulk powders. As long as the gravitational forces are prevailing the powder is able to flow. However as soon as the interparticle forces dominate the powder becomes cohesive. It does not flow any longer. Based on empirical observations highly dispersed Silicone dioxide is added to powders to improve their flowability. In the present paper we will present some findings obtained from studies on binary mixtures consisting of 0.2(m/m) of a nanoscaled material and corn starch. They give some insight into the mechanism of action of flow regulators. In addition they allow to classify flow regulators with respect to their efficiency as well as to their effectiveness. Furthermore the findings give hints on how to optimize existing flow regulators or to develop new improved ones.
© 2004 Oldenbourg Wissenschaftsverlag GmbH
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Articles in the same Issue
- EXAFS Spectroscopy – Fundamentals, Measurement Techniques, Data Evaluation and Applications in the Field of Phthalocyanines
- Kinetic Hydrogen/Deuterium Isotope Effects in Multiple Proton Transfer Reactions
- Nanomaterials as Flow Regulators in Dry Powders
- Scanning Electrochemical Microscopy as a Versatile Tool for Modifying Surfaces
- The Absorption Spectrum of Anisole and the Anisole/CO2 1:1-Cluster. The Influence of Intermolecular Interaction on Intramolecular Vibrations
- The Kinetics and Quantum Dynamics of Intramolecular Rearrangements in Highly Symmetrical Complexes: The Berry Pseudorotation
- High Time Resolution Multifrequency EPR of Radical Pair Intermediates in Photosynthetic Reaction Centers: Structure Determination on a Nanosecond Time Scale
- Book Reviews
