文献类型：期刊文献

英文题名：Insights into the interactions between Surfactin, betaines and PAM: Surface tension, small-angle neutron scattering and small-angle X-ray scattering study

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

机构：[1] Shanghai Key Laboratory of Functional Materials Chemistry, State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, Budapest, 1525 POB 49, Hungary; [3] Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Materials Research, Max-Planck-Strasse 1, Geesthacht, 21502, Germany; [4] Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Polymer Research, Max-Planck-Strasse 1, Geesthacht, 21502, Germany

年份：2018

外文期刊名：arXiv

收录：EI(收录号：20200412176)

语种：英文

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

摘要：The interactions between neutral polymer polyacrylamide (PAM) and the biosurfactant Surfactin and four betaines, NdodecylN,Ndimethyl3 ammonio1propanesulfonate (SDDAB), Ntetradecyl N,Ndimethyl3ammonio1propanesulfonate (STDAB), NhexadecylN,N dimethyl3ammonio1propanesulfonate (SHDAB), and NdodecylN,Ndimethyl2ammonioacetate (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 follow separately the changes of structure of PAM and surfactant aggregates. At concentrations of betaines higher than CMC (critical micelle concentration) and C2 (CMC of surfactant with the presence of polymer), spherical micelles are formed in betaines and betaines/PAM solutions. Transition from spherical to rod-like aggregates (micelles) has been observed in solutions of Surfactin and Surfactin/SDDAB (αSurfactin = 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 in PBS. Viscosity values follow the structural changes suggested from scattering measurements i.e., gradually increases for mixtures PAM →Surfactin/PAM → Surfactin/SDDAB/PAM in PBS. Copyright ? 2018, The Authors. All rights reserved.