46. Calculate the repulsion energy U of spherical nanoparticles with radius r in an aqueous electrolyte solution with concentration c at the potential of the diffuse layer φb. Take a temperature of 25 °C and a relative permittivity of the medium of 78.6. The calculation should be made at distances between the surfaces of particles h: 1, 2, 4, 8, 16, 32 nm. Plot U = f(h).

Task Electrolyte с, mmol/l φb, mV r, nm
46 MgCl2 1.000 18 32

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