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@ARTICLE{Bressel:18194,
      author       = {Bressel, K. and Prevost, S. and Appavou, M.-S. and Tiersch,
                      B. and Koetz, J. and Gradzielski, M.},
      title        = {{P}hase behaviour and structure of zwitanionic mixtures of
                      perfluorocarboxylates and tetradecyldimethylamine
                      oxide-dependence on chain length of the perfluoro
                      surfactant},
      journal      = {Soft matter},
      volume       = {7},
      issn         = {1744-683X},
      address      = {Cambridge},
      publisher    = {Royal Society of Chemistry (RSC)},
      reportid     = {PreJuSER-18194},
      pages        = {11232 - 11242},
      year         = {2011},
      note         = {This research work was financially supported by the German
                      Research Council (DFG) within the frame of the priority
                      program SPP 1273 Kolloidverfahrenstechnik (GR1030/7-1 and
                      2). The SANS measurements on V4 at the HZB have been
                      supported by the European Commission under the 6th Framework
                      Programme through the Key Action: Strengthening the European
                      Research Infrastructures (Contract no: RII3-CT-2003-505925
                      (NMI 3)). The SANS measurements on KWS-2 of JCNS (operating
                      at FRMII, Munich) have been supported by the European
                      Commission under the 7th Framework Programme through the
                      'Research Infrastructures' action of the 'Capacities
                      Programme' Contract no.: 226507 (NMI3). M. G. would like to
                      thank the Institute Laue-Langevin (ILL, Grenoble, France)
                      and the DFG (project GR1030/10) for hospitality and funding
                      of his sabbatical stay during which this manuscript was
                      produced. Fruitful discussions with T. Narayanan are
                      gratefully acknowledged. Finally we would like to thank the
                      referees for their constructive comments that helped to
                      improve the manuscript.},
      abstract     = {Phase behaviour and the mesoscopic structure of zwitanionic
                      surfactant mixtures based on the zwitterionic
                      tetradecyldimethylamine oxide (TDMAO) and anionic lithium
                      perfluoroalkyl carboxylates have been investigated for
                      various chain lengths of the perfluoro surfactant with an
                      emphasis on spontaneously forming vesicles. These mixtures
                      were studied at a constant total concentration of 50 mM and
                      characterised by means of dynamic light scattering (DLS),
                      electric conductivity, small-angle neutron scattering
                      (SANS), viscosity, and cryo-scanning electron microscopy
                      (Cryo-SEM). No vesicles are formed for relatively short
                      perfluoro surfactants. The extension of the vesicle phase
                      becomes substantially larger with increasing chain length of
                      the perfluoro surfactant, while at the same time the size of
                      these vesicles increases. Head group interactions in these
                      systems play a central role in the ability to form vesicles,
                      as already protonating 10 $mol\%$ of the TDMAO largely
                      enhances the propensity for vesicle formation. The range of
                      vesicle formation in the phase diagram is not only
                      substantially enlarged but also extends to shorter perfluoro
                      surfactants, where without protonation no vesicles would be
                      formed. The size and polydispersity of the vesicles are
                      related to the chain length of the perfluoro surfactant, the
                      vesicles becoming smaller and more monodisperse with
                      increasing perfluoro surfactant chain length. The ability of
                      the mixed systems to form well-defined unilamellar vesicles
                      accordingly can be controlled by the length of the alkyl
                      chain of the perfluorinated surfactant and depends strongly
                      on the charge conditions, which can be tuned easily by
                      pH-variation.},
      keywords     = {J (WoSType)},
      cin          = {ICS-1 / JCNS (München) ; Jülich Centre for Neutron
                      Science JCNS (München) ; JCNS-FRM-II / JCNS-1 / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)ICS-1-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {BioSoft: Makromolekulare Systeme und biologische
                      Informationsverarbeitung},
      pid          = {G:(DE-Juel1)FUEK505},
      experiment   = {EXP:(DE-MLZ)KWS2-20140101},
      shelfmark    = {Chemistry, Physical / Materials Science, Multidisciplinary
                      / Physics, Multidisciplinary / Polymer Science},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000297029500026},
      doi          = {10.1039/c1sm05618b},
      url          = {https://juser.fz-juelich.de/record/18194},
}