Study on the phase behavior of CTAB reverse microemulsion system

A series of quasi ternary phase diagram of hexadecyl trimethyl ammonium bromide( CTAB) +n-butanol+n-hexane+water( brine) system have been drawn based on experiments. We investigated the influence of cosurfactant n-butanol with different addition and CaCl2 solution with different molar concentration on the microemulsion region respectively. We found that the area of microemulsion region in the ternary system gradually decreased with the relative proportions of cosurfactant n-butanol increase,these results shown that they are not conducive to the formation of microemulsion phase when the amount of n-butanol in relatively high levels; We found that the area of microemulsion region in the ternary system decreased with the increase of the molar concentration of calcium chloride,these results shown that strong electrolytes has an important effect on the microemulsion phase,higher concentration of CaCl2 will make part of CTAB lose surface activity and will make the system difficult to form microemulsion,these leads to the decreasing of microemulsion phase area. The rules of conductivity changing with the added amount of water( or CaCl2 aqueous solution) were measured experimentally,the microscopic structure of microemulsion had been discussed according to the electrolytic theory,and sphere nanometer calcium carbonate particles were prepared by choosing a certain value R0 of CaCl2microemulsion reacting with equimolar sodium carbonate solution.