Abstract:

From the dynamic surface pressure of Peregal O-20 spreading monolayres, the variation of the model material surface concentrations was obtained by extrapolating method.Taking advantage of the relation Π_t～c , the diffusion coefficients (D₀) of the Peregal O-20 desorpted from the surface at air-water interface to the aqueous bulk was calculated.The order of D₀ was 10^-4～10^-3 cm²/s.The initial surface concentration is the key factor of influence on the diffusion coefficients of Peregal O-20.