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@ARTICLE{Bogomolova:189592,
      author       = {Bogomolova, Anna and Keller, Sandro and Klingler, Johannes
                      and Sedlak, Marian and Rak, Dmytro and Sturcova, Adriana and
                      Hruby, Martin and Stepanek, Petr and Filippov, Sergey K.},
      title        = {{S}elf-{A}ssembly {T}hermodynamics of p{H}-{R}esponsive
                      {A}mino-{A}cid-{B}ased {P}olymers with a {N}onionic
                      {S}urfactant},
      journal      = {Langmuir},
      volume       = {30},
      number       = {38},
      issn         = {1520-5827},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {FZJ-2015-02730},
      pages        = {11307 - 11318},
      year         = {2014},
      abstract     = {The behavior of pH-responsive polymers
                      poly(N-methacryloyl-l-valine) (P1),
                      poly(N-methacryloyl-l-phenylalanine) (P2), and
                      poly(N-methacryloylglycyne-l-leucine) (P3) has been studied
                      in the presence of the nonionic surfactant Brij98. The pure
                      polymers phase-separate in an acidic medium with critical
                      pHtr values of 3.7, 5.5, and 3.4, respectively. The addition
                      of the surfactant prevents phase separation and promotes
                      reorganization of polymer molecules. The nature of the
                      interaction between polymer and surfactant depends on the
                      amino acid structure in the side chain of the polymer. This
                      effect was investigated by dynamic light scattering,
                      isothermal titration calorimetry, electrophoretic
                      measurements, small-angle neutron scattering, and infrared
                      spectroscopy. Thermodynamic analysis revealed an endothermic
                      association reaction in P1/Brij98 mixture, whereas a strong
                      exothermic effect was observed for P2/Brij98 and P3/Brij98.
                      Application of regular solution theory for the analysis of
                      experimental enthalpograms indicated dominant hydrophobic
                      interactions between P1 and Brij98 and specific interactions
                      for the P2/Brij98 system. Electrophoretic and dynamic light
                      scattering measurements support the applicability of the
                      theory to these cases. The specific interactions can be
                      ascribed to hydrogen bonds formed between the carboxylic
                      groups of the polymer and the oligo(ethylene oxide) head
                      groups of the surfactant. Thus, differences in
                      polymer–surfactant interactions between P1 and P2 polymers
                      result in different structures of polymer–surfactant
                      complexes. Specifically, small-angle neutron scattering
                      revealed pearl-necklace complexes and “core–shell”
                      structures for P1/Brij98 and P2/Brij98 systems,
                      respectively. These results may help in the design of new
                      pH-responsive site-specific micellar drug delivery systems
                      or pH-responsive membrane-disrupting agents.},
      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:000342607000008},
      pubmed       = {pmid:25192406},
      doi          = {10.1021/la5031262},
      url          = {https://juser.fz-juelich.de/record/189592},
}