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Colloidal crystals made of poly(N-isopropylacrylamide) microgel particles |
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| Authors: | T Hellweg C D Dewhurst E Brückner K Kratz W Eimer |
| Institution: | TU Chemnitz, Institut für Physik Materialforschung und Flüssigkeiten 09107 Chemnitz, Germany e-mail: T.Hellweg@physik.tu-chemnitz.de, DE Institut Laue-Langevin Avenue des Martyrs BP156, 38042 Grenoble Cedex 9, France, FR Universit?t Essen Institut für Umweltanalytik Universit?tsstrasse 3-5, 45141 Essen Germany, DE Universit?t Bielefeld Fakult?t für Chemie Physikalische Chemie 1 33615 Bielefeld, Germany, DE |
| 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. Received: 26 July 1999/Accepted: 21 March 2000 |
| Keywords: | Colloids Microgel Face-centred-cubic lattice Small-angle neutron scattering Light scattering |
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