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@ARTICLE{GarcaPrez:189594,
      author       = {García-Pérez, Ángela and da Silva, Marcelo A. and
                      Eriksson, Jonny and González-Gaitano, Gustavo and Valero,
                      Margarita and Dreiss, Cécile A.},
      title        = {{R}emarkable {V}iscoelasticity in {M}ixtures of
                      {C}yclodextrins and {N}onionic {S}urfactants},
      journal      = {Langmuir},
      volume       = {30},
      number       = {39},
      issn         = {1520-5827},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {FZJ-2015-02732},
      pages        = {11552 - 11562},
      year         = {2014},
      abstract     = {We report the effect of native cyclodextrins (α, β, and
                      γ) and selected derivatives in modulating the self-assembly
                      of the nonionic surfactant polyoxyethylene cholesteryl ether
                      (ChEO10) and its mixtures with triethylene glycol
                      monododecyl ether (C12EO3), which form wormlike micelles.
                      Cyclodextrins (CDs) generally induce micellar breakup
                      through a host–guest interaction with surfactants;
                      instead, we show that a constructive effect, leading to gel
                      formation, is obtained with specific CDs and that the widely
                      invoked host–guest interaction may not be the only key to
                      the association. When added to wormlike micelles of ChEO10
                      and C12EO3, native β-CD, 2-hydroxyethyl-β-CD (HEBCD), and
                      a sulfated sodium salt of β-CD (SULFBCD) induce a
                      substantial increase of the viscoelasticity, while
                      methylated CDs rupture the micelles, leading to a loss of
                      the viscosity, and the other CDs studied (native α- and γ-
                      and hydroxypropylated CDs) show a weak interaction. Most
                      remarkably, the addition of HEBCD or SULFBCD to pure ChEO10
                      solutions (which are low-viscosity, Newtonian fluids of
                      small, ellipsoidal micelles) induces the formation of
                      transparent gels. The combination of small-angle neutron
                      scattering, dynamic light scattering, and cryo-TEM reveals
                      that both CDs drive the elongation of ChEO10 aggregates into
                      an entangled network of wormlike micelles. 1H NMR and
                      fluorescence spectroscopy demonstrate the formation of
                      inclusion complexes between ChEO10 and methylated CDs,
                      consistent with the demicellization observed. Instead, HEBCD
                      forms a weak complex with ChEO10, while no complex is
                      detected with SULFBCD. This shows that inclusion complex
                      formation is not the determinant event leading to micellar
                      growth. HEBCD:ChEO10 complex, which coexists with the
                      aggregated surfactant, could act as a cosurfactant with a
                      different headgroup area. For SULFBCD, intermolecular
                      interactions via the external surface of the CD may be more
                      relevant.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
      ddc          = {670},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {54G - JCNS (POF2-54G24)},
      pid          = {G:(DE-HGF)POF2-54G24},
      experiment   = {EXP:(DE-MLZ)KWS2-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000343017600008},
      pubmed       = {pmid:25201697},
      doi          = {10.1021/la503000z},
      url          = {https://juser.fz-juelich.de/record/189594},
}