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Colloid and Polymer Science

, Volume 278, Issue 10, pp 972–978 | Cite as

Colloidal crystals made of poly(N-isopropylacrylamide) microgel particles

  • T. Hellweg
  • C. D. Dewhurst
  • E. Brückner
  • K. Kratz
  • W. Eimer
SHORT COMMUNICATION

Abstract

Poly (N-isopropylacrylamide) microgel particles are found to form colloidal crystals similar to those occurring in typical hard-sphere colloids like poly(methylmethacrylate) beads. Samples made of particles with different cross-linker concentrations are investigated and their deswelling ratio is determined using dynamic light scattering. Small-angle neutron scattering data are also presented and analysed in terms of a face-centred-cubic crystal structure. The characteristic length, a, of the elementary cell is found to be 535 ± 16 and 495 ± 15 nm for the two systems investigated. This leads to particle radii of 189 ± 6 and 175 ± 5 nm, respectively. These values compare well to the radii determined using several different methods.

Key words Colloids Microgel Face-centred-cubic lattice Small-angle neutron scattering Light scattering 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • T. Hellweg
    • 1
  • C. D. Dewhurst
    • 2
  • E. Brückner
    • 3
  • K. Kratz
    • 4
  • W. Eimer
    • 4
  1. 1.TU Chemnitz, Institut für Physik Materialforschung und Flüssigkeiten 09107 Chemnitz, Germany e-mail: T.Hellweg@physik.tu-chemnitz.deDE
  2. 2.Institut Laue-Langevin Avenue des Martyrs BP156, 38042 Grenoble Cedex 9, FranceFR
  3. 3.Universität Essen Institut für Umweltanalytik Universitätsstrasse 3-5, 45141 Essen GermanyDE
  4. 4.Universität Bielefeld Fakultät für Chemie Physikalische Chemie 1 33615 Bielefeld, GermanyDE

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