37. Calculate the potential energy u of the interaction of two plane-parallel plates located in an aqueous electrolyte solution with concentration c, at the value of the potential of the diffuse layer φs, relative dielectric constant εr and temperature t. When calculating, take the Hamaker constant A* = 3.0•10–20 J. Calculations are made for distances between the plates h: 2, 5, 10, 15, 25, 50 nm. Draw a graph of u = f(h).
Problem Electrolyte s, mmol/l t, 0C εr φδ, mV
37 Na3PO4 0.1 5 85.1 18

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