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Calculating the Structural Parameters of Microemulsion Systems by Dilution Method

SHEN Xinghai, WANG Wenqing, GAO Hongcheng(Department of Technical Physics,Peking University)  
The structural parameters of the SDS(sodium dodecyl sulfate)-alcohol-heptane-water system,i.e.,the radius of inner water droplet R_w,the effective radius ofparticle R_e,the length of interface l,the average aggregation number of surfactant n,the total number of particles N_d and the total interfacial area of dispersed phase A_d,were obtained by means of dilntion method and theoretical calcnlation. The change ofstandard free energy for alcohol to transfer from the continuous pkase to tbeinterfacial niembranes was also calculated.It was found that the linear relationshipsexist between or R_w and the carbon atom number of alcohol n,and between R_wand the water content V_(H20).
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