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@ARTICLE{Pohlmeier:38456,
      author       = {Pohlmeier, A. and Haber-Pohlmeier, S.},
      title        = {{I}onization of short polymethacrylic acid: titration,
                      {DLS} and model calculations},
      journal      = {Journal of colloid and interface science},
      volume       = {273},
      issn         = {0021-9797},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {PreJuSER-38456},
      pages        = {369 - 380},
      year         = {2004},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {In this work the charging of polymethacrylic acid in excess
                      electrolyte solution is investigated experimentally by
                      titration and dynamic light scattering. The results are
                      analyzed by a penetrable sphere model, which employs the
                      Poisson-Boltzmann equation for the description of
                      electrostatic interactions and takes into account specific
                      binding of H+ and Na+. The evaluation of the DLS data yields
                      two relaxation modes. The slow mode is present only at
                      finite degrees of charging and is therefore caused by
                      collective diffusion. The fast mode, which corresponds to
                      diffusion coefficients in the range from (1.1 to 1.5) x
                      10(-10) m2 s(-1), is present over the whole pH range. This
                      reflects the diffusional dynamics of the polyion itself and
                      allows the calculation of hydrodynamic radii for equivalent
                      spheres (RH). These increase from 1.5 nm at pH 2.14 up to
                      1.8 nm for a degree of deprotonation alpha=0.47 at pH 5.86.
                      With a further increase of pH the radii slightly decrease to
                      1.6 nm. Setting the radius of the penetrable sphere equal to
                      RH, we can successfully model the overall charging curve
                      with logK0H=4.85 and logK0Na=-0.6. This means that weak
                      complexes of the type COO---Na are formed, which reduce the
                      effective charge inside the polyelectrolyte coil.},
      keywords     = {J (WoSType)},
      cin          = {IBI-2 / ICG-IV},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB58 / I:(DE-Juel1)VDB50},
      pnm          = {Neurowissenschaften / Chemie und Dynamik der
                      Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK255 / G:(DE-Juel1)FUEK257},
      shelfmark    = {Chemistry, Physical},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:15082370},
      UT           = {WOS:000220999000005},
      doi          = {10.1016/j.jcis.2004.02.047},
      url          = {https://juser.fz-juelich.de/record/38456},
}