Rheological behavior and drying characteristics of ceria-based suspensions under various pH conditions

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

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Microstructural changes in ceria-based suspensions at different pH values and corresponding rheological and drying properties were correlated. Ceria-based suspensions were classified into four zones based on their pH values. Well-dispersed or aggregated states of ceria particles in suspensions were mainly discerned by the magnitude of zeta-potential with pH variations and additional condensation reaction at relatively high pH. Suspensions with well-dispersed particles in a particular pH range exhibited transition between shear-thinning and Newtonian behavior along the shear rate and weak thixotropic features, whereas suspensions with agglomerated particles in different pH ranges showed significant shear-thinning and thixotropic behaviors with shear rate. The motion of particles within suspension droplets in each zone was quantified in terms of autocorrelation functions during drying using multi-speckle diffusing wave spectroscopy. Suspension droplets with well-dispersed particles showed conspicuous coffee-ring patterns compared to those with aggregated particles, owing to the rapid Brownian motion of well-dispersed particles.

Original languageEnglish
Article number117984
JournalPowder Technology
Volume412
DOIs
Publication statusPublished - 2022 Nov

Bibliographical note

Funding Information:
This study was supported by the Ministry of Trade, Industry, and Energy (MOTIE, Korea) under the Industrial Technology Innovation Program (No. 20004044 ) 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 ).

Publisher Copyright:
© 2022 Elsevier B.V.

Keywords

  • Aggregation
  • Ceria
  • Droplet drying
  • Particle motion
  • Rheological properties
  • pH

ASJC Scopus subject areas

  • General Chemical Engineering

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