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Citation: JIA Zhi-gang, DONG Le, LI Xing, GAO Wen-chao, WEI Wen-long, CHANG Hong-hong, YANG Zhi-feng. Wettability of coal tar pitch surface by aqueous solution of C12-m-C12 cationic Gemini surfactant[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(6): 649-653. shu

Wettability of coal tar pitch surface by aqueous solution of C12-m-C12 cationic Gemini surfactant

  • 1.

    1. College of Chemical and Chemistry Engineering, Taiyuan University of Technology, Taiyuan 030024, China;

  • Corresponding author: CHANG Hong-hong, 
  • Received Date: 16 June 2014
    Available Online: 9 September 2014

    Fund Project: 国家自然科学基金(21206103,21076135) (21206103,21076135)道路结构与材料交通运输行业重点实验室开放基金(KF201403)。 (KF201403)

  • Wettability and adsorptive mechanism of coal tar pitch by aqueous solutions of cationic surfactant (C12-m-C12·2Br-, m=4, 6, 8, 10)were investigated by the sessile drop analysis and electrophoresis. The results indicate that the surface tension decreases with increasing surfactant concentration up to the CMC (critical micelle concentration) of the surfactant solution, which θ and S have the similar trend with surface tension. Within the whole range of concentration, the Zisman theory is in accordance with the wettability on the coal tar pitch when spacer chain length value reaches to 10. Meanwhile, there is a liner dependence between adhesion tension (γlgcosθ) and surface tension (γlg). Zeta potential on the surface of the coal tar pitch increases with the increasing surfactant concentration from negative to positive, and finally levels off. And the concentration of the zero potential is lower than CMC at least an order of magnitude. C12-8-C12 Gemini surfactants can significantly change the wettability on the surface of the coal tar pitch. According to the wetting data and Zeta potential of Gemini surfactant on coal tar pitch, it can be inferred that wetting is a concerted action result of electrostatic interaction and van der waals adsorption. Therefore, wetting process can be generally divided into three phases.
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