Effect of solution pH on the microstructural and rheological properties in boehmite suspensions

The relationship between microstructure changes and rheological properties in suspensions containing boehmite particles, which are well applied in various industrial wash-coating processes, was investigated by changing pH condition. The boehmite particles in suspensions were either well dispersed or...

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Bibliographic Details
Published in:Korea-Australia rheology journal 2023, 35(1), , pp.1-10
Main Authors: Lee, Gi Wook, Kim, Seong Hwan, Lee, Da Young, Lee, Kwan-Young, Chun, Byoungjin, Jung, Hyun Wook
Format: Article
Language:English
Subjects:
Boehmite
Characterization and Evaluation of Materials
Chemistry and Materials Science
Complex Fluids and Microfluidics
Food Science
Materials Science
Mechanical Engineering
Microstructure
Original Article
Polymer Sciences
Rheological properties
Shear viscosity
Soft and Granular Matter
Yield strength
Yield stress
공학일반
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Summary:The relationship between microstructure changes and rheological properties in suspensions containing boehmite particles, which are well applied in various industrial wash-coating processes, was investigated by changing pH condition. The boehmite particles in suspensions were either well dispersed or aggregated depending on the pH, owing to the relative contributions of repulsive interaction between particles as well as hydrolysis and condensation reactions. Four groups of boehmite suspensions were classified as very low, intermediate, almost zero charge, and high pH regimes based on their colloidal behaviors, and their microstructural differences were investigated using transmission electron microscopy (TEM) and multi-speckle diffusing wave spectroscopy (MSDWS). For gel-like suspensions of three groups, various rheological properties such as shear viscosity, viscoelastic modulus, yield stress, and recovery behavior were extensively compared, and the results clearly demonstrated that a suspension with high yield stress was not fully recovered into the original state when disturbed at high shear rates.
ISSN:1226-119X
2093-7660
DOI:10.1007/s13367-022-00046-7