Abstract
The self-assembly of surface active ionic liquid 1-(2-hydroxyethyl)-3-dodecylimidazolium chloride([C2OHC12im]Cl) in aqueous solutions with various inorganic salts(NaX,X=Cl-,Br-and I-,Na2SO4) has been investigated by surface tension method and fluorescence probe method,respectively.The critical micelle concentration(CMC) and average aggregation number(Nm) of [C2OHC12im]Cl changed remarkably in aqueous medium with the presence of counter ions.It is believed that the [C2OHC12im]+ monomers or micelles are combined with the counter ions to neutralize their surface charges.The order of the counter ions in altering the self-assembly parameters of [C2OHC12im]Cl in aqueous medium follows Cl-Br-I-SO2-4.However,the effects of the category of counter ions on the critical aggregation number(Nm,C) and the micropolarity of micelle(m) were marginal.Along with the increase of the concentration of Br-,the CMC decreases logarithmically and the Nm increases by an empirical power law.
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