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Internal dynamics in colloidal PNIPAM microgel particles immobilised in mesoscopic crystals by Thomas Hellweg; Karl Kratz; Stephanie Pouget; Wolfgang Eimer is a Materials Science article available to read on EtoBox.

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Internal dynamics of colloidal microgels based on N-isopropyl-acrylamide is investigated by means of neutron spin-echo spectroscopy. To avoid interference of the relaxation of interest with the centre of mass diffusion, the microgels were immobilised in a colloidal crystal. Due to the q-range used in these quasi-elastic neutron scattering experiments, it is possible to obtain nearly completely decaying ensemble averaged intermediate scattering functions ISF E . These can be fitted by single exponential forms, simplifying largely the data analysis compared with photon correlation spectroscopy. This is due to the fact that for light q 2 x 2 can not be reached, whereas for neutrons this condition is approximately fulfilled. The obtained network diffusion coefficients decrease linearly with increasing cross-linker concentration. This is in contrast to previous results from photon correlation spectroscopy obtained for macroscopic poly(N-isopropyl-acrylamide) gels [Macromolecules, 29 (1996) 8746].

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Author

Thomas Hellweg; Karl Kratz; Stephanie Pouget; Wolfgang Eimer

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0927-7757)

Published

2002

Language

EN

Field

Materials Science (Physical Sciences)