New Type Liquid Membrane Oscillator(Ⅱ)

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Abstract A New type of liquid membrane oscillator had been designed with anionic surfactant sodium tetradecane sulfate (STS) and cationic surfactant cetyltrimethyl ammonium bromide (CTAB) as key substances. The fundamental composition of the oscillator is 5 0 mmol·dm -3 CTAB+1 5mol·dm -3 ethanol(aq)/2 0mmol·dm -3 STS (nitrobenzene)/0 5mol·dm -3 NaCl(aq). A pair of Pt electrodes were used to monitor the change of electric potential near the interface between the two phases of water and nitrobenzene. Many new special phenomena were found, such as adjustable oscillations in two directions and formation of emulsion. The mechanism and influence factors were studied by the substitution of every component, changing concentration, the comparison between experimental results from different apparatus, as well as auxiliary experiments. It was found from experiments that the formation of emulsion is a necessary condition for the oscillation producing because the ion pair of STS and CTAB can not associate. A new mechanism model was given after reviewing preceding theories of liquid membrane oscillator.

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Received 2001-05-15; published 2001-05-15

Cite this article:

HE Zhan bo, YAN Xi long, NIE Yu min, ZHAO Zhu lu .New Type Liquid Membrane Oscillator(Ⅱ)[J] Chemcial Industry and Engineering, 2001,V18(3): 130-136

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