SHEAR-WAVES IN COLLOIDAL CRYSTALS .1. DETERMINATION OF THE ELASTIC-MODULUS

Shear waves are excited in a latex sample. One detects the vibrations of the sample using light scattering phenomena (Kossel rings). The amplitude of vibrations of the latex sample, when recorded as a function of the frequency of excitation, presents a series of resonances. Analysis of the resonance peaks allows to determine the elastic modulus of the latex crystal. The authors study the variation of the elastic modulus as a function of different parameters characteristic of the latex.