| Abstract In this paper, by using iodine in the solution as colourdisplay reagent, critical micelle concentration(CMC) of nonionic surfactant Tween20/40 were investigated by ultraviolet absorption spectrophotometry,which were 519×10-5 mol/L and 190×10-5 mol/L,respectively. CMC of surfactants Tween20/40 by viscosity method were 500×10-5 mol/L and 193×10-5 mol/L, and the effect of different NaCl concentrations on CMC and viscosity were studied.Results showed that CMC determined by spectrophotometric method was closely agreed with that in literature.The solutions relative viscosity has a tendency of droping with increasing NaCl, while CMC values remain unchanged. For constant NaCl, relative viscosity increases at first and then keep constant when CMC is reached. |
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2011, Vol. 28 
