Direct Evidence for the Energy of Weak Interactions between Surfactant Molecules Using High Sensitivity Isothermal Titration Calorimetry

doi:10.3866/PKU.WHXB201304282

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	Direct Evidence for the Energy of Weak Interactions between Surfactant Molecules Using High Sensitivity Isothermal Titration Calorimetry
	Lou Peng-Xiao 1; Wang Yu-Jie 2,3; Bai Guang-Yue 1; Fan Chao-Ying 1; Wang Yi-Lin 3
刊名	ACTA PHYSICO-CHIMICA SINICA
	2013-07-01
卷号	29 期号:7 页码:1401-1407
关键词	Isothermal Titration Calorimetry Intermolecular Interaction Thermodynamics Surfactant Enthalpy Of Interaction Conductivity
ISSN号	1000-6818
DOI	10.3866/PKU.WHXB201304282
英文摘要	Calorimetry is a direct experimental method that can be used to study the thermodynamics of weak interactions between surfactant molecules, allowing the energetic parameters of such interactions to be obtained. In this work, a nano-isothermal titration calorimeter with a thermostat (TAM III) was used to evaluate the thermodynamic behavior of molecular self-assemblies of single and mixed surfactants in aqueous solution. Electrical calibration of this instrument showed that its precision is better than +/- 0.09%. The accuracy of the system was tested by measuring the reaction heat of tris-hydroxymethyl-aminomethane (Tris), employed often as a calorimetric standard substance, with hydrochloric acid. The resulting value ((-47.48 +/- 0.12) kJ . mol(-1)) agreed well with that in the literature. We then determined the critical micelle concentration (cmc) and enthalpy of micellization for dodecyltrimethylammonium bromide (DTAB) with a "head-and-tail" structure, which were consistent with reported values, as well as reliable results for sodium cholate (NaC) with a rigid steroid skeleton composed of hydrophilic and hydrophobic surfaces. Furthermore, for the mixed system of oppositely charged surfactants (DTAB/NaC), the mixed cmc and enthalpy of mixed micellization were also obtained in NaC- and DTAB-rich regions. A stronger synergistic effect was observed between the two types of surfactants in the NaC- rich region than in the DTAB-rich one. Conductivity measurements allowed the thermodynamic behavior of the mixed system (DTAB/NaC) to be discussed in detail.
语种	英语
出版者	PEKING UNIV PRESS
WOS记录号	WOS:000320439300005
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/42129]
专题	中国科学院化学研究所
通讯作者	Bai Guang-Yue
作者单位	1.Henan Normal Univ, Sch Chem & Chem Engn, Minist Educ, Key Lab Green Chem Media & React, Xinxiang 453007, Henan Province, Peoples R China 2.Henan Inst Sci & Technol, Sch Chem & Chem Engn, Xinxiang 453003, Henan Province, Peoples R China 3.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Key Lab Colloid & Interface Sci, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Lou Peng-Xiao,Wang Yu-Jie,Bai Guang-Yue,et al. Direct Evidence for the Energy of Weak Interactions between Surfactant Molecules Using High Sensitivity Isothermal Titration Calorimetry[J]. ACTA PHYSICO-CHIMICA SINICA,2013,29(7):1401-1407.
APA	Lou Peng-Xiao,Wang Yu-Jie,Bai Guang-Yue,Fan Chao-Ying,&Wang Yi-Lin.(2013).Direct Evidence for the Energy of Weak Interactions between Surfactant Molecules Using High Sensitivity Isothermal Titration Calorimetry.ACTA PHYSICO-CHIMICA SINICA,29(7),1401-1407.
MLA	Lou Peng-Xiao,et al."Direct Evidence for the Energy of Weak Interactions between Surfactant Molecules Using High Sensitivity Isothermal Titration Calorimetry".ACTA PHYSICO-CHIMICA SINICA 29.7(2013):1401-1407.