Chem. J. Chinese Universities ›› 2002, Vol. 23 ›› Issue (8): 1583.

• Articles • Previous Articles     Next Articles

Studies of the Surface Activity of Gleditsin and the Thermodynamic Properties of Its Binary Mixtures

WANG Zheng-Wu1, LI Gan-Zuo1, MU Jian-Hai1, GUAN Da-Ren1, LIAO Li-Ling2, LOU An-Jin3   

  1. 1. Key Lab of Colloid and Interface Chemistry for State Education Ministry, Shandong University, Jinan 250100, China;
    2. Department of Chemistry, Guizhou Normal University, Guiyang 550001, China;
    3. Langmuir Center for Colloids and Interfaces, Columbia University, NY 10027, U.S.A
  • Received:2001-04-02 Online:2002-08-24 Published:2002-08-24

Abstract: The surface activity and the thermodynamic properties of gleditsin saponin(GS)(C29 H46(OH)COOH) were studied by surface tension method at 0, 15, 25, 35, 45 and 60 ℃. With the method, the surface activity of its binary aqueous solutions with C12 H25-SO3Na(AS), C12 H25 (OC2H4)3-SO4Na(AES), C7F15 CO2Na(OBS), C16 H33 NMe3 Br(CTAB), C8H17-Ph(EO)10 OH(Triton) and C12 H25 (EO)9OH(AEO9) were also studied at 25 ℃. The composition of the surface adsorption layers, molecular interaction parameters and the molecule exchanging energy of surfactants of these mixtures were calculated according to the dimensional crystal model and the regular solution theory with the help of the curves γ~lg c. The relationship between activity and molecule exchanging energy of surfactants were emphatically discussed. The results show that gleditsin saponin mainly acts as a nonionic surfactant in aqueous solution but as a weak acid anionic surfactant when mixed with cationic CTAB. The synergism order of its binary mixtures is: GScationic>GSnonionic>GSanionic.

Key words: Gleditsin, Surfactant, Surface tension, Dimensional crystal model, Molecular interaction parameter, Molecule exchanging energy

CLC Number: 

TrendMD: