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Citation: DING Wei, WANG Huimin, LUO Shiqiong, ZHANG Zhiwei, DONG Zhilong, YU Tao, QU Guangmiao, CHENG Jiecheng. Effects of Average Molecular Mass and Its Distribution of Alkyl Aryl Sulfonate on the Structural Parameters and Thermodynamic Functions of Microemulsion[J]. Chinese Journal of Applied Chemistry, ;2012, 29(7): 844-851. doi: 10.3724/SP.J.1095.2012.00352 shu

Effects of Average Molecular Mass and Its Distribution of Alkyl Aryl Sulfonate on the Structural Parameters and Thermodynamic Functions of Microemulsion

1.
a College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing 163318, China;
2.
b Development Department of Science and Technology, Daqing Oil Field Corp. Ltd, Daqing 163453, China

Corresponding author: DING Wei,
Received Date: 10 August 2011
Available Online: 31 October 2011
Fund Project: 国家重点基础研究发展规划"973"(2005CB221300) (2005CB221300)黑龙江省研究生创新科研(YJSCX2008-044HLJ)资助项目 (YJSCX2008-044HLJ)

The structural parameters of complex systems of seven kinds of aryl sulfonate(synthesized in the laboratory) alkyl aryl sulfonate(AAS)/n-butanol/n-decane/water microemulsions were obtained by means of a dilution method.We also calculated the standard free energy ΔG_o→i⁰ of transfer from the continuous oil phase to the interfacial region,the standard enthalpy ΔH_o→i⁰ and the standard entropy ΔS_o→i⁰ values.The effects of the average molecular mass and its distribution of AAS on the structural parameters and thermodynamic functions were investigated.The results show that the effective radius of dispersive phase R_e,the radius of inner sphere water R_w,their difference d_i,the average aggerate number of surfactant molecules per drop n,have the tendency of normal distribution N_d、and the total interface area of dispersion phase outer sphere A_d appear to be contrary to the above consequence.The values of -ΔG_o→i⁰ exhibit the tendency of normal distribution(5.36 kJ/mol) S_o→i⁰ have the tendency of normal distribution(26.88 J/(mol·K)) R_w,R_e,n,d_i,-ΔG_o→i⁰,ΔH_o→i⁰,ΔS_o→i⁰ increase while the values of N_d,A_d decrease.In addition,the values of structural parameters,-ΔG_o→i⁰ and ΔS_o→i⁰ change linearly with the average molecular mass of the AAS,the latter two are y=0.0586x=-17.916 and y=0.2203x=-61.275,respectively.
- alkyl aryl sulfonate,
- average molecular mass,
- molecular mass distribution,
- microemulsion,
- structural parameter,
- thermodynamic functions
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