Hysteresis of Isotherms of Mixed Monolayers of N-Octadecyl-N′-phenylthiourea and Stearic Acid at Air/Water Interface

Table 1

Limiting area/molecule of OPT/SA premixed monolayer for coinciding curves.

Mole fraction of OPT : SA in the spreading mixtures	Area/total deposited OPT and SA molecules (Å^2)	Area/SA molecules added (Å^2)	Area/molecule remaining in monolayer, assuming a 1 : 1 complex plus any excess SA (Å^2)
0.888 : 0.112	5.69	50.6	25.3
0.693 : 0.307	14.8	48.1	24.1
0.601 : 0.399	17.1	42.7	21.4
0.504 : 0.496	19.0	38.4	19.2
0.372 : 0.628	19.9	31.8	19.9
0.220 : 0.780	19.7	25.2	19.7