Abstract
The dynamic surface tension (γt) and apparent diffusion coefficient (D) of nonionic surfactant Tween‐20 in the presence and absence of bovine serum albumin (BSA) have been investigated via the measurements of surface pressure (π) at different time (t). The curves of γt∼t are obtained from π∼t isotherms. Results show that the γt∼t relationships of Tween‐20 solution with or without BSA accord with the Ward‐Tordai equation in the region of initial adsorption. D value obtained from the γt∼t1/2 curves shows that the diffusion of Tween‐20 slows down with the increase of the concentration of Tween‐20 (c Tween‐20). And D value of Tween‐20 in the presence of BSA is almost the same as that of the system without BSA when c Tween‐20 is constant, suggesting that the interaction between Tween‐20 and BSA is weak.
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