Abstract
Abstract The association behavior of an amphiphilic ionic liquid 1-butyl-3-methylimidazolium dodecylsulfate ([bmim][DS]) and a non-ionic surfactant Brij30, in the presence and absence of NH4Cl and NaCl, was investigated using DLS, SANS and Rheology. The apparent hydrodynamic radius (Rh) of the mixed micelles increases with increase in mole fraction of the non-ionic component. The variation in micellar size with Brij30 mole fraction is sensitive to the nature and concentration of the two salts. The increase in size of mixed micelles is more pronounced in presence of NH4Cl than NaCl, owing to higher salting out effect of NH4+ ions compared to Na+ ions. The hydrodynamic radius of the mixed mcielles decreases with increase in temperature from 25 °C to 45 °C, due to dehydration of oxyethylene units in Brij30. SANS studies reveal that [bmim][DS] micelles grow significantly with increase in Brij30 mole fraction and the presence of salt facilitates micellar elongation. The zero shear viscosity of mixed micelles in the presence of 0.4 M NH4Cl and NaCl increases with Brij30 mole fraction, the effect being more in presence of the former.
Published Version
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