55. Solving a chemistry problem

55. Solving a chemistry problem

18. Using a rotational viscometer, 76% aqueous suspensions of electrocorundum were studied, in the dispersion medium of which an electrolyte (KCl) was introduced, causing aggregation of particles of the dispersed phase:
P, N/m2 10 20 40 60 80 100 120 160
neff, Pa*s, at KCl concentration
without KCl 0.5 1.6 3.0 3.7 3.9 4.0 4.0 3.9
5*10–4 mol/l 4.4 4.5 4.5 4.5 4.5 4.5 4.5 4.4
0.1 mol/l 9.0 7.5 6.3 5.8 5.2 4.9 4.8 4.7
Plot plots of effective viscosity versus stress and determine the types of structures in suspensions (structural changes during deformation are reversible).

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