Influence of surface wettability on the accuracy of measurement of fluid shear modulus

The shear moduli of liquids and their dependence on the degree of purity of the piezocrystal surface are measured by acoustic resonance method using a piezoelectric quartz resonator. As a criterion of surface condition the coefficient of static friction is accepted, which is measured by tribometer of Derjaguin–Lazarev design. The various methods of surface treatment which give a wide range of friction coefficients are used. At the maximum value of the coefficient of friction vibrating piezoquartz surface is completely wetted by the liquid and the effective value of the shear modulus of the liquid is the highest.