期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 356, 期 2, 页码 605-613出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2011.01.062
关键词
Binary surfactant system; Nonionic surfactant; Gemini surfactant; Interaction; Aggregate morphology
资金
- National High Technology Research and Development Program of China [2007AA090701-2]
- Important National Science and Technology Specific Project [2008ZX05024-002]
Properties of binary surfactant systems of nonionic surfactants poly(ethylene oxide) (PEO) lauryl ethers (C12E10, C12E23, C12E42) with a cationic gemini surfactant, butanediyl-alpha,omega-bis(tetradecyldimethylammonium bromide) (14-4-14), have been investigated by Steady-state Fluorescence (FL), zeta potential, Dynamic Light Scattering (DLS), Transmission Electron Microscopy (TEM), Cryogenic Transmission Electron Microscopy (CryoTEM), and X-ray Diffraction (XRD). Through FL measurements, critical micelle concentration (CMC) of the three binary systems for different mixing mole fractions is determined and the values fall between those of pure constituent surfactants. Ideal CMC (CMCideal), mole fraction in aggregates (X), interaction parameter (beta), activity coefficients (f(1) and f(2)), and excess free energy of mixing (Delta G(ex)) have been calculated. All these parameters indicate nonideal behavior and synergistic interactions between the constituent surfactants, which is explained in terms of electrostatic attraction between headgroups of constituent surfactants and reduction of electrostatic repulsion between headgroups of 14-4-14 due to the presence of nonionic surfactants. DLS, TEM and CryoTEM results show that nonionic surfactants facilitate the formation of larger aggregates. Micelles and vesicles in larger size compared with those of 14-4-14 coexist in the mixed solutions. Both surfactant composition and PEO chain length are found to play a strong effect on the properties of the binary systems. (C) 2011 Elsevier Inc. All rights reserved.
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