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@ARTICLE{Mohanty:821203,
      author       = {Mohanty, P. S. and Nöjd, S. and Bergman, M. J. and
                      Naegele, Gerhard and Arrese-Igor, S. and Alegria, A. and
                      Roa, R. and Schurtenberger, P. and Dhont, Jan K.G.},
      title        = {{D}ielectric spectroscopy of ionic microgel suspensions},
      journal      = {Soft matter},
      volume       = {12},
      number       = {48},
      issn         = {1744-6848},
      address      = {London},
      publisher    = {Royal Soc. of Chemistry},
      reportid     = {FZJ-2016-06441},
      pages        = {9705-9727},
      year         = {2016},
      abstract     = {The determination of the net charge and size of microgel
                      particles as a function of their concentration, as well as
                      the degree of association of ions to the microgel backbone,
                      has been pursued in earlier studies mainly by scattering and
                      rheology. These methods suffer from contributions due to
                      inter-particle interactions that interfere with the
                      characterization of single-particle properties. Here we
                      introduce dielectric spectroscopy as an alternative
                      experimental method to characterize microgel systems. The
                      advantage of dielectric spectroscopy over other experimental
                      methods is that the polarization due to mobile charges
                      within a microgel particle is only weakly affected by
                      inter-particle interactions. Apart from electrode
                      polarization effects, experimental spectra on PNIPAM-co-AA
                      [poly(N-isopropylacrylamide-co-acrylic acid)] ionic microgel
                      particles suspended in de-ionized water exhibit three
                      well-separated relaxation modes, which are due to the
                      polarization of the mobile charges within the microgel
                      particles, the diffuse double layer around the particles,
                      and the polymer backbone. Expressions for the full frequency
                      dependence of the electrode-polarization contribution to the
                      measured dielectric response are derived, and a theory is
                      proposed for the polarization resulting from the mobile
                      charges within the microgel. Relaxation of the diffuse
                      double layer is modeled within the realm of a cell model.
                      The net charge and the size of the microgel particles are
                      found to be strongly varying with concentration. A very
                      small value of the diffusion coefficient of ions within the
                      microgel is found, due to a large degree of chemical
                      association of protons to the polymer backbone.},
      cin          = {ICS-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)ICS-3-20110106},
      pnm          = {551 - Functional Macromolecules and Complexes (POF3-551)},
      pid          = {G:(DE-HGF)POF3-551},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000394087100012},
      pubmed       = {pmid:27808335},
      doi          = {10.1039/C6SM01683A},
      url          = {https://juser.fz-juelich.de/record/821203},
}