Influence of particle modulus on the rheological properties of agar microgel suspensions

Adams, S., Frith, W. J. and Stokes, J. R. (2004) Influence of particle modulus on the rheological properties of agar microgel suspensions. Journal of Rheology, 48 6: 1195-1213. doi:10.1122/1.1773782

Author Adams, S.
Frith, W. J.
Stokes, J. R.
Title Influence of particle modulus on the rheological properties of agar microgel suspensions
Journal name Journal of Rheology   Check publisher's open access policy
ISSN 0148-6055
Publication date 2004-01-01
Year available 2004
Sub-type Article (original research)
DOI 10.1122/1.1773782
Open Access Status DOI
Volume 48
Issue 6
Start page 1195
End page 1213
Total pages 19
Place of publication New York
Publisher American Institute of Physics
Language eng
Abstract The linear viscoelastic and steady shear flow properties of high phase volume suspensions of a range of agar microgel particles have been measured and are found to depend upon the deformability (or modulus) of the particles. Agar concentrations in the range 0.5-5 wt % are utilized, giving a range of particle modulus spanning 2.4-185 kPa. On increasing the particle modulus, in suspensions with phase volumes above maximum packing, the storage modulus increases by two orders of magnitude although the loss tangent (tan delta) also increases due to increasing viscous dissipation. The flow properties of the suspensions at high shear stresses also showed significant differences due to changing particle rigidity. The suspensions containing the hardest particles are found to display limited evidence of shear-thickening behavior at high stresses, while those containing the softest particles continue to shear thin. A high-shear plateau in the viscosity is observed for suspensions with particles of medium rigidity. The suspensions containing the stiffer particles also have a considerably higher viscosity for the same degree of space filling. Empirical expressions linking the viscoelastic and flow properties to the particle modulus have been derived. (C) 2004 The Society of Rheology.
Keyword Mechanics
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Chemical Engineering Publications
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Created: Thu, 02 Jul 2009, 02:03:38 EST