AN EXAMINATION ON THE ADSORPTION-KINETICS OF 1-DECANOL AT AIR-WATER-INTERFACE

The adsorption kinetics of 1-decanol was investigated by measuring the equilibrium and dynamic surface tension profiles by Lin et al. (1995) . From the relaxation of surface tension for the adsorption onto a cle an air-water interface and the desorption out of a compressed interfac e, the diffusivity and the kinetic rate constants of 1-decanol were ev aluated. in this work, the adsorption kinetics for 1-decanol is examin ed theoretically. Using the equilibrium data of surface tension, diffu sivity and the generalized Frumkin adsorption model, the relaxations o f surface tension of the adsorption and desorption processes are simul ated. Novel regions, where the adsorption onto a clean interface is of diffusion-control and the desorption out of a compressed interface is mixed-controlled, at different compression ratios are identified for 1-decanol. This is resulted from the presence of cohesive intermolecul ar forces between the decanol molecules adsorbed at the air-water inte rface. The data of kinetic rate constants evaluated by Lin et al. are also compared with the novel regions. Decanol is verified theoreticall y that the adsorption onto a clean interface is diffusion-controlled a nd the desorption out of a compressed interface is of diffusive-kineti c control.