盐对二-(2-乙基己基)膦酸铵皂W/O微乳液极限溶水量和电导率的影响

Effect of Salts on Solubilization and Conductivity of 2 - (2 - Ethylhexylphosphonic Acid) Saponified by Ammonia

测量了五种浓度的九种盐的水溶液在二-(2-乙基己基膦酸)铵皂(P204·NH_4)/正庚烷/水W/O微乳液中的极限增溶量(φ_m).结果表明,同种盐不同浓度的水溶液在该微乳液中的φ_m的差别,可以由内聚能(R—比)理论得到合理的解释.相同浓度的不同种类的盐水溶液的φ_m的差别,用R—比理论无法解释.实验发现了φ_m随盐的阴、阳离子的电荷-半径之比(z/r)、极化率、水合能(Ey)的增大而减小,同时测量了该体系的电导率(k)随盐水的增溶量(φ)的变化.

Limiting amounts of solubilized aqueous (m ) UNO, NaNO3 ,KNO3 ,LiCl,NaCl,KCl,Li2SO4 ,Na2SO4 , K2SO4 in the microemulsion of 2 - (2 - Ethylhexylphosphonic Acid) Saponified by Ammonia (P204.NH4)/n-heplane / water have been measured an a function of the concentration of the salts. The effect of salt on solubization of the microemulsion has been studied by the theory of cohesive energies (theory of R -ratio). The results show that theory of R - ratio may explain the effect of concentration of each salt on m of the microemulsion, but can not explain the differences of the effect of these salt on m . It has beenfound that, the polamability. the energy of hydration , the radio(z/r) of charge (z) and rdaius (r) of cation and anion of salts was correlated with the effect of salt on m .Furthermore, the effect of kind and concentration of salt on the conductivity ( k ) of the W/O microemulsion have also been investigated.