The effect of NaCl and Na2SO4 concentration in aqueous phase on the phase inversion temperature O/W nanoemulsions

Abstract The effect of NaCl and Na 2 SO 4 concentrations in aqueous phase on the phase inversion temperature (PIT) in nanoemulsions of water/Brij30/ n -hexadecane system has been studied separately, and then compared. The variation of conductivity with temperature was measured by Cyber Scan PC510 conductivity meter for emulsions with 20 wt% hexadecane and 8 wt% Brij30 concentration and different concentrations of NaCl and Na 2 SO 4 in aqueous phase. The results showed that with increasing concentrations of NaCl and Na 2 SO 4 in aqueous phase, the PIT of nanoemulsions decreases. The effect of the elevation of concentration on the decrease of PIT was more for Na 2 SO 4 in aqueous phase than NaCl with equal concentrations.