3. Calculate the thickness of the hydrated shells of silica sol particles, if by experimental methods: it is established that the viscosity of 15% (mass.) sol is 1.3 * 10-3 Pa * s, and the particle diameter is 16 nm. The particle densities of the dispersed phase of the sol and the dispersion medium are 2.7 and 1 g/cm3, respectively. The viscosity of the dispersion medium is 1*10-3 Pa*s. Particle shape factor a = 2.5.

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