Synthesis and Aggregation Behavior of a Hexameric Quaternary Ammonium Surfactant
Fan, Yaxun1; Hou, Yanbo1; Xiang, Junfeng2; Yu, Defeng1; Wu, Chunxian1; Tian, Maozhang1; Han, Yuchun1; Wang, Yilin1
Source PublicationLANGMUIR
AbstractA star-shaped hexameric quaternary ammonium surfactant (PAHB), bearing six hydrophobic chains and six charged hydrophilic headgroups Connected by an amide-type spacer group, was synthesized. The self-assembly behavior of the surfactant in aqueous solution was studied by surface tension, electrical conductivity, isothermal titration microcalorimetry, dynamic light scattering, cryogenic transmission electron microscopy, and NMR techniques. The results reveal that there are two critical aggregate concentrations during the process of aggregation, namely C(1) and C(2). The aggregate transitions are proved to be caused by the changes of the surfactant configuration through hydrophobic interaction among the hydrocarbon,chains. Below, C(1), PAHB may present a star-shaped molecular configuration due to intramolecular electrostatic repulsion among the charged headgroups, and large aggregates with network-like structure are observed. Between C(1) and C(2), the hydrophobic interaction among the hydrophobic chains may become stronger to make the hydrophobic chains of the PAHB molecules curve back and more closely, and then the network like aggregates transfer to large spherical aggregates of similar to 100 nm. Beyond C(2), the hydrophobic interaction may become strong enough to cause the PAHB molecular configuration to turn into a pyramid-like shape, resulting the transition of the spherical large aggregates to spherical micelles of similar to 10 nm. Interestingly, the PAHB displays high emulsification ability to linear fatty alkyls even at very low concentration.
Indexed BySCI
WOS IDWOS:000294373300032
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Document Type期刊论文
Corresponding AuthorWang, Yilin
Affiliation1.Chinese Acad Sci, Key Lab Colloid & Interface Sci, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Ctr Phys Chem Anal & Measurement, Beijing Natl Lab Mol Sci, Inst Chem, Beijing 100190, Peoples R China
Recommended Citation
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Fan, Yaxun,Hou, Yanbo,Xiang, Junfeng,et al. Synthesis and Aggregation Behavior of a Hexameric Quaternary Ammonium Surfactant[J]. LANGMUIR,2011,27(17):10570-10579.
APA Fan, Yaxun.,Hou, Yanbo.,Xiang, Junfeng.,Yu, Defeng.,Wu, Chunxian.,...&Wang, Yilin.(2011).Synthesis and Aggregation Behavior of a Hexameric Quaternary Ammonium Surfactant.LANGMUIR,27(17),10570-10579.
MLA Fan, Yaxun,et al."Synthesis and Aggregation Behavior of a Hexameric Quaternary Ammonium Surfactant".LANGMUIR 27.17(2011):10570-10579.
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