The Effect of Aniline Hydrochloride Hydrotrope on the Phase Behavior of SDS/Water System

摘要: The aim of this work was to determine the detailed phase behavior sodium dodecyl sulfate/aniline hydrochloride/water system as a function concentration sulfate (SDS), aniline hydrochloride (AHC) molar ratio (R = [AHC]/[SDS]) and temperature. Phase information obtained via polarizing microscopy, differential scanning calorimetry (DSC), cryo-scanning electron microscopy (Cryo-SEM) oscillatory linear rheological measurements with good agreement among these techniques. It is well known that SDS in water forms spherical micelles at concentrations lower than 40 wt% temperatures above its Krafft temperature (Tk = 16–21 °C). In region, SDS/water exhibits Newtonian behavior, which characteristic micellar solutions. addition hydrotrope, hydrochloride, aqueous solutions produces viscosity increase R augments, maximum about five orders magnitude found R = 0.47 for 5 20 °C. Moreover, shows transition from viscous strong viscoelastic behavior. These changes are produced by transitions sphere rodlike micelles, induced hydrophobicity AHC causing it be absorbed into core hydrophilic interface screens repulsions between charged head groups.