期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 436, 期 -, 页码 684-692出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2013.08.009
关键词
Saccharide-cationic surfactants; Surface properties; Adsorption; Aggregation behavior
资金
- Shanxi Province Youth Fund [2012021009-3]
- National Science and Technology Support Project of China [2012BAD32B10]
A novel saccharide-cationic surfactants containing a quaternary ammonium as cation and saccharideamide as nonion N,N-dimethyl-N[3-(gluconamide/lactobionamide)lpropyl-N-alkylammonium bromides (C(n)DGPB and CnDLPB, where n represents hydrocarbon chain lengths of 8, 10, 12, and 14) were designed and synthesized. Their surface activities, adsorption, and aggregation behavior in aqueous solution were investigated by surface tension, conductivity, dynamic light scattering (DLS) and transmission electron microscopy (TEM). Surface tension measurement was used to derive surface adsorption properties such as adsorption efficiency (pC(20)), the (CMC/C-20) ratio, maximal surface excess concentration (Gamma(max)), and minimum surface area per molecule (Amin) at the air-water interface. From the results of temperature dependent conductivity measurements we could obtain the degree of counterion binding (beta), and the thermodynamic parameters such as standard free energy (Delta G(mic)(0)), enthalpy (AH(mic)(0)), and entropy (Delta S-mic(0)) of aggregation. DLS and TEM analysis of C(14)DGPB aqueous solutions revealed the morphology of molecular self-assembles. (C) 2013 Elsevier B.V. All rights reserved.
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