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NMR Studies of Solvent Dynamics in High Solids Alumina Slurries

Published online by Cambridge University Press:  15 February 2011

Anthony A. Parker ,
Deborah M. Wilhelmy  and
William Daunch
Anthony A. Parker
Affiliation:
Aluminum Company of America, Alcoa Center, PA 15069.
Deborah M. Wilhelmy
Affiliation:
Aluminum Company of America, Alcoa Center, PA 15069.
William Daunch
Affiliation:
Aluminum Company of America, Alcoa Center, PA 15069.
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Abstract

Solid state 13C NMR techniques have been used to study the mobility of both toluene and ethanol in slurries containing 70% alumina by weight. A comparison of relative signal intensities from cross polarization experiments, and from single excitation experiments under static conditions (no sample spinning) shows that a portion of the solvent molecules are immobilized with “solid” characteristics, while a majority of the molecules exist in mobile or “liquid” like environments. The immobilized solvent is rigid enough to cross polarize with protons, and hence it is characterized by long correlation times, and by a high viscosity. The remainder of the solvent is too mobile to cross polarize, and hence it is characterized by a lower viscosity. The results suggest that solvent is partitioned with the most viscous components being bound near the particle surfaces. These experiments and calculations will be discussed along with the implied effects of solvent partitioning on bulk rheological behavior.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 289: Symposium M – Flow and Microstructure of Dense Suspensions , 1992 , 43
Copyright
Copyright © Materials Research Society 1993

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