Journal article

Impact of volume transition on the net charge of poly-$N$-isopropyl acrylamide microgels

  • Braibanti, Marco Department of Physics, University of Fribourg, Switzerland
  • Haro-Pérez, Catalina Departamento de Ciencias Básicas, Universidad Autónoma Metropolitana-Azcapotzalco, Ciudad de México, Mexico
  • Quesada-Pérez, M. Departamento de Física, Universidad de Jaén, Escuela Politécnica Superior de Linares, Spain
  • Rojas-Ochoa, Luis Fernando Departamento de Física, CINVESTAV-IPN, Ciudad de México, Mexico
  • Trappe, Véronique Department of Physics, University of Fribourg, Switzerland
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Published in:
  • Physical Review E. - 2016, vol. 94, no. 3, p. 032601
English We explore the electrostatic properties of poly-N-isopropyl acrylamide microgels in dilute, quasi-de-ionized dispersions and show that the apparent net charge of these thermosensitive microgels is an increasing function of their size, the size being conveniently varied by temperature. Our experimental results obtained in a combination of light scattering, conductivity, and mobility experiments are consistent with those obtained in Poisson-Boltzmann cell model calculations, effectively indicating that upon shrinking the number of counterions entrapped within the microgels increases. Remarkably, this behavior shows that the electrostatic energy per particle remains constant upon swelling or deswelling the microgel, resulting in a square root dependence of the net charge on the particle radius.
Faculté des sciences et de médecine
Département de Physique
  • English
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