关键词:

CTAB, 苦味酸, 界面, 液膜, 振荡

Abstract:

The oscillation of the liquid membrane formed by water（aqueous mixtures of cetyl trimethyl ammonium bromide（CTAB）and n-butanol）/oil（nitrobenzene-picric acid）/water（aqueous solution of glucose）was investigated.A hollow glass tube device was designed for this study.The effects of the concentrations of CTAB，picric acid or other cooperative additives on the oscillation were examined.It was found that the oscillation frequency decreased with the increase of CTAB concentration.The oscillation could not be observed when CTAB concentration was below 3 mmol·L^-1.The oscillations frequency became higher with the increase of the concentration of picric acid，and front oscillation disappeared when the concentration exceeded 1.5 mmol·L^-1.The cooperative additives also affected the regularity and repeatability of oscillation.Specially，both the curves of current-time（I-t）and potential-time（E-t）were measured firstly.It was found the I-t curve and E-t curve showed similar variance，indicating that the oscillation could also be examined by monitoring current.By using our hollow glass tube device，we could obtain the oscillations at 50～200 mV range conveniently，and get the results more repeatedly.The results were explained in terms of Marangoni effect and chemism.

Key words:

CTAB, 苦味酸, 界面, 液膜, 振荡