ICCAS OpenIR
Microcalorimetric studies on the thermodynamic properties of cationic gemini surfactants
Bai, GY; Yan, HK; Thomas, RK
2001-07-24
Source PublicationLANGMUIR
ISSN0743-7463
Volume17Issue:15Pages:4501-4504
AbstractMicrocalorimetric measurements have been made as a function of temperature on the series of gemini surfactants [CMH2M+1(CH3)(2)N(CH2)(S)N(CH3)(2)CMH2M+1]Br-2, designated CMCSCM, where M and S indicate the numbers of carbon atoms in the side chains and spacer, respectively, for M = 12 and S = 3, 4, 6, 8, 10, and 12. The maximum at S = 4-6 in the values of the critical micelle concentrations (cmc's) as a function of spacer length was found to be associated with a strong minimum in the magnitude of the exothermic enthalpy of micellization, DeltaH(mic). A strong maximum in the corresponding entropies of micellization, DeltaS(mic), almost cancels out the effect of DeltaH(mic), so that DeltaG(mic) and hence the values of the cmc show a much weaker variation with spacer. The values of Delta Cp pass through a marked minimum and are large, corresponding to a large variation of DeltaH(mic) with temperature. This variation of DeltaH(mic) has some interesting consequences for the variation of the cmc. Thus, for C12C12C12 the contribution of DeltaH(mic) to DeltaG(mic) at room temperature is about 36%, but this increases through 61% to 84% at 308 K. Over this range the changes in DeltaG(mic) remain within about 10% of each other, almost within the experimental error.
Indexed BySCI
Language英语
WOS IDWOS:000170029300010
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:49[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/78018
Collection中国科学院化学研究所
Corresponding AuthorYan, HK
Affiliation1.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing 100080, Peoples R China
2.Univ Oxford, Phys & Theoret Chem Lab, Oxford OX1 3QZ, England
Recommended Citation
GB/T 7714
Bai, GY,Yan, HK,Thomas, RK. Microcalorimetric studies on the thermodynamic properties of cationic gemini surfactants[J]. LANGMUIR,2001,17(15):4501-4504.
APA Bai, GY,Yan, HK,&Thomas, RK.(2001).Microcalorimetric studies on the thermodynamic properties of cationic gemini surfactants.LANGMUIR,17(15),4501-4504.
MLA Bai, GY,et al."Microcalorimetric studies on the thermodynamic properties of cationic gemini surfactants".LANGMUIR 17.15(2001):4501-4504.
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