文献类型：期刊文献

英文题名：Insights into the Interactions among Surfactin, Betaines, and PAM: Surface Tension, Small-Angle Neutron Scattering, and Small-Angle X-ray Scattering Study

作者：Xiao, Jingwen[1,2];Liu, Fang[1,2];Garamus, Vasil M.[4];Almasy, Laszlo[3];Handge, Ulrich A.[5];Willumeit, Regine[4];Mu, Bozhong[1,2];Zou, Aihua[1,2]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[3]Inst Solid State Phys & Opt, Wigner Res Ctr Phys, H-1525 Budapest, Hungary;[4]Inst Mat Res, Ctr Mat & Coastal Res, Helmholtz Zentrum Geesthacht, D-21502 Geesthacht, Germany;[5]Polymer Res Inst, Ctr Mat & Coastal Res, Helmholtz Zentrum Geesthacht, D-21502 Geesthacht, Germany

年份：2014

卷号：30

期号：12

起止页码：3363

外文期刊名：LANGMUIR

收录：;EI(收录号：20141517562301);WOS:【SCI-EXPANDED(收录号:WOS:000333776400010)】；

基金：A.Z. gratefully acknowledges the support of this work by the Alexander von Humboldt Foundation. We gratefully acknowledge the support of this work by Chinese National Natural Science Foundation (201003047) and Fundamental Research Funds for the Central Universities. The SANS measurements have been performed with the support of the European Commission (Grant agreement N 283883-NMI3). This work was supported by project KMR12-1-2012-0226 granted by the National Development Agency (NDA) of Hungary. The experimental support of Ivonne Ternes (rheological measurements) and Clement Blanchet (SAXS measurements) is gratefully acknowledged. The great English writing improvement from Prof. Leonard I. Wiebe, Department of Oncology, Faculty of Medicine & Dentistry, University of Alberta is also gratefully acknowledged.

语种：英文

外文关键词：Micelles - Surface scattering - Surface tension - Betaines - X ray scattering - Molecules - Critical micelle concentration - Neutron scattering

摘要：The interactions among neutral polymer polyacrylamide (PAM) and the biosurfactant Surfactin and four betaines, N-dodecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (SDDAB), N-tetradecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (STDAB), N-hexadecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (SHDAB), and N-dodecyl-N,N-dimethyl-2-ammonio-acetate (C12BE), in phosphate buffer solution (PBS) have been studied by surface tension measurements, small-angle neutron scattering (SANS), small-angle X-ray scattering (SAXS), and rheological experiments. It has been confirmed that the length of alkyl chain is a key parameter of interaction between betaines and PAM. Differences in scattering contrast between X-ray and neutrons for surfactants and PAM molecules provide the opportunity to separately follow the changes of structure of PAM and surfactant aggregates. At concentrations of betaines higher than CMC (critical micelle concentration) and C-2 (CMC of surfactant With the presence of polymer), spherical micelles are formed in betaines and betaines/PAM solutions. Transition from spherical to rodlike aggregates (micelles) has been observed in solutions of Surfactin and Surfactin/SDDAB (alpha(Surfactin) = 0.67 (molar fraction)) with addition of 0.8 wt % of PAM. The conformation change of PAM molecules only can be observed for Surfactin/SDDAB/PAM system. Viscosity values follow the structural changes suggested from scattering measurements i.e., gradually increases for mixtures PAM -> Surfactin/PAM -> Surfactin/SDDAB/PAM in PBS.