Study on surface active and dynamic surface tension of K12 and AEO9/6501 complex systems
LI Gang-sen
CAI Li-fang
WANG Pei-yi
CHEN Shuai
WANG Rui-juan
Abstract：The critical micelle concentration(cmc),equilibrium surface tension(γ)and dynamic surface ten-sion (DST)of K12-AEO9 and K12-6501 formulations were investigated.The best synergistic effect and minimal cmc could be observed that is cmc was 0.1 4 mmol·L-1 and 0.30 mmol·L-1 when the mass ratio was 11 for K12-AEO9 and 37 for K12-6501 .When the mass ration of K12 and AEO9 was 11 ,the balance time(t*) was minium(1 .42 s),the surface tension reducing rate(R1/2)reached maximum (14.47 mN·m-1 ·s-1 ) and the binary system showed the best dynamic surface activity.As for K12-6501 ,the best results were observed when the mass ratio was 37.The maximum R1/2 (1 4.25 mN·m-1 ·s-1 )was obtained and the system was more easy to reach the equilibrium system of medium.The obtained experimental data showed that the two kinds of mixture adsorption equilibrium time on the water surface decreased and tension reducing rate of R1/2 increased with the increasing of the surfactant concentration.
Keywords：sodium dodecyl sulfate (K1 2 )primary alcobol ethoxylate (AEO9 )coconutt diethanol amide (6501 )synergistic effectsdynamic surface tension
Publication Date：2016-08-31
Pages：7( 51-57 )