Journal article

Temperature-sensitive poly(N-Isopropyl-Acrylamide) microgel particles: A light scattering study

  • Reufer, Mathias Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland - Adolphe Merkle Institute, University of Fribourg, Switzerland
  • Díaz-Leyva, Pedro Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
  • Lynch, I. School of Chemistry and Chemical Biology, University College Dublin, Ireland
  • Scheffold, Frank Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
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    25.11.2008
Published in:
  • European Physical Journal E. - 2009, vol. 28, no. 2, p. 165-171
English We present a light scattering study of aqueous suspensions of microgel particles consisting of poly(N-Isopropyl-Acrylamide) cross-linked gels. The solvent quality for the particles depends on temperature and thus allows tuning of the particle size. The particle synthesis parameters are chosen such that the resulting high surface charge of the particles prevents aggregation even in the maximally collapsed state. We present results on static and dynamic light scattering (SLS/DLS) for a highly diluted sample and for diffuse optical transmission on a more concentrated system. In the maximally collapsed state the scattering properties are well described by Mie theory for homogenous hard spheres. Upon swelling we find that a radially inhomogeneous density profile develops.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/300997
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