91. Solving a chemistry problem
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3.14 Calculate how the work of adhesion changes as a result of the adsorption of a cationic surfactant when the glass surface is wetted with an aqueous solution of dodecylmethylammonium bromide. The glass surface is covered with a layer of octadecane. Plot the wetting isotherm /cosO=f(Spav)/ using the data below:
Decay, mmol/l 0 1*10-4 1*10-2 1 2 5 10
bj, mJ/m2 72 71.5 70.1 63.2 56.2 50.9 41.0
O, deg 106 105 96 72 60 0 0
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