Centrifugal compression of soft particle packings: Theory and experiment

K.N. Nordstrom, E. Verneuil, W.G. Ellenbroek, T.C. Lubensky, J.P. Gollub, D.J. Durian

Research output: Contribution to journalArticleAcademicpeer-review

27 Citations (Scopus)

Abstract

An exact method is developed for computing the height of an elastic medium subjected to centrifugal compression, for arbitrary constitutive relation between stress and strain. Example solutions are obtained for power-law media and for cases where the stress diverges at a critical strain-for example as required by packings composed of deformable but incompressible particles. Experimental data are presented for the centrifugal compression of thermo-responsive N-isopropylacrylamide (NIPA) microgel beads in water. For small radial acceleration, the results are consistent with Hertzian elasticity, and are analyzed in terms of the Young elastic modulus of the bead material. For large radial acceleration, the sample compression asymptotes to a value corresponding to a space-filling particle volume fraction of unity. Therefore we conclude that the gel beads are incompressible, and deform without deswelling. In addition, we find that the Young elastic modulus of the particulate gel material scales with cross-link density raised to the power 3.3±0.8, somewhat larger than the Flory expectation.

Original languageEnglish
Article number041403
Number of pages8
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume82
Issue number4
DOIs
Publication statusPublished - 8 Oct 2010
Externally publishedYes

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