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《Journal of Jiangxi Normal University (Natural Sciences Edition)》 1997-04
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The Effect of Temperature on the Viscosity of Cetyltrimethylammonium Bromide Micellar Solutions in the Presence of Added Salt

Mo Chunsheng Zhong Qian(Department of Chemistry,Jiangxi Normal University,Nanchang 330027))  
:The effect of temperature on the viscosities of cetyltrimethylammonium bromide(CTAB) in the presence of different added salt was investigated.It was found that the viscosities of CTAB micelle solutions decrease with increasing temperature due to the break up of the cylindrical rodlike micelles.The value of ΔH obtained from the plot of ΔG/T versus 1/T are much larger than the values of ΔG calculated from Eyring equation at various temperatures.It is proposed that the transition of rod to spherical micelles can not be conceivable in only one step but in infinite steps,and in each step the rodlike micelles are always in equilibrium with activated micelle aggregates which can rapidly translate into smaller cylindrical micelles,and finally into spherical micelles.ΔH consistently larger than ΔG is associated with a breakdown of cylinderical micelles into smaller spherical micelles since this transition also requires energy to weaken the intermolecular forces and to increase the area of interface.
【Fund】: 江西省自然科学基金
【CateGory Index】: O648
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