ICCAS OpenIR
Anomalous effects of concentrated salts on the equimolarly mixed cationic-anionic surfactant mixtures
Chen, Li1; Xing, Hang1,2; Yan, Peng1; Ma, Ji-Ming1; Xiao, Jin-Xin1,2
2011
Source PublicationSOFT MATTER
ISSN1744-683X
Volume7Issue:11Pages:5365-5372
AbstractEffects of alkali metal halides (NaX, X = F(-), Cl(-), Br(-), I(-); KX, X = Cl(-), Br(-), I(-); and CsCl) on the morphology of the aggregates of decyltriethylammonium bromide and sodium decylsulfonate (C(10)NE-C(10)SO(3)) mixtures with equimolar ratios were studied by static/dynamic light scattering and viscosity measurements. The average hydrodynamic radii of the aggregates, the apparent aggregation number, and the relative viscosity as functions of both the concentrations of surfactants and added salts were investigated, respectively. It showed that the addition of a small amount of NaX (e. g., 0.1 M) had only small effects on the C(10)NE-C(10)SO(3) vesicles. However, striking anion specificity, which differed anomalously with the anions of salts varying from F(-) to I(-), was observed when large amounts of NaX (e. g., 1 M) were added. The size of the C(10)NE-C(10)SO(3) aggregates was normally increased and then a liquid-liquid phase separation occurred with the addition of NaF; meanwhile, the addition of NaCl had little effect on the C(10)NE-C(10)SO(3) aggregates under experimental conditions; however, the size of the C(10)NE-C(10)SO(3) aggregates was abnormally decreased when high concentrations of NaBr or NaI (up to 2 M) were added, implying a vesicle-to-micelle transition which might be due to a decrease in the intramicellar attraction between oppositely charged headgroups by electrical shielding, and the mixtures still remained homogeneous. A cation specificity of added salts was also observed with the increase of the ionic radii from Na(+) to Cs(+). However, it was noted that the influence of increasing the ionic radii of cations on the aggregate size was not as pronounced as that of anions in the presence of high concentrations of salts. The aggregates of C(10)NE-C(10)SO(3) became a little smaller when concentrated alkali metal halides with bigger cations were added into this homogeneous equimolar cationic-anionic surfactant mixture. Both the observed cation and anion specificities were consistent with the Hofmeister series.
DOI10.1039/c1sm05115f
Indexed BySCI
Language英语
WOS IDWOS:000290937300038
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/72330
Collection中国科学院化学研究所
Corresponding AuthorXiao, Jin-Xin
Affiliation1.Peking Univ, Beijing Natl Lab Mol Sci, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
2.Beijing FLUOBON Surfactant Inst, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Chen, Li,Xing, Hang,Yan, Peng,et al. Anomalous effects of concentrated salts on the equimolarly mixed cationic-anionic surfactant mixtures[J]. SOFT MATTER,2011,7(11):5365-5372.
APA Chen, Li,Xing, Hang,Yan, Peng,Ma, Ji-Ming,&Xiao, Jin-Xin.(2011).Anomalous effects of concentrated salts on the equimolarly mixed cationic-anionic surfactant mixtures.SOFT MATTER,7(11),5365-5372.
MLA Chen, Li,et al."Anomalous effects of concentrated salts on the equimolarly mixed cationic-anionic surfactant mixtures".SOFT MATTER 7.11(2011):5365-5372.
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