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

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Abstract

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.

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Acknowledgements

This study was supported by the Ministry of Trade, Industry, and Energy (MOTIE, Korea) under the Industrial Technology Innovation Program (No. 20011712) and by National Research Foundation of Korea (NRF) grants funded by the Ministry of Science and ICT (MSIT) of the Korean government (No. NRF-2016R1A5A1009592 and NRF-2021M3H4A6A01041234).

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Authors and Affiliations

  1. Department of Chemical and Biological Engineering, Korea University, Seoul, 02841, Republic of Korea

    Gi Wook Lee, Seong Hwan Kim, Da Young Lee, Kwan-Young Lee, Byoungjin Chun & Hyun Wook Jung

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  1. Gi Wook Lee
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Correspondence to Byoungjin Chun or Hyun Wook Jung.

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Lee, G.W., Kim, S.H., Lee, D.Y. et al. Effect of solution pH on the microstructural and rheological properties in boehmite suspensions. Korea-Aust. Rheol. J. 35, 1–10 (2023). https://doi.org/10.1007/s13367-022-00046-7

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  • DOI: https://doi.org/10.1007/s13367-022-00046-7

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