Shear waves and ’’internal viscosity’’ in cylindrical gels

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Abstract
The torsional excitation modes of gels formed in cylindrical containers are expounded by solving a set of modified elasticity equations. These equations have been modified to contain terms which account for dissipation of mechanical energy by rearrangements of microscopic gel structures. Results are used to interpret dynamic light scattering measurements of the shear modulus G and internal viscosity η of bulk gel. Illustrative data are presented which show the concentration dependence of G and η for a series of agarose gels. A simple device for exciting observable shear modes in light scattering cuvettes is described.

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