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Poly-NIPAM microgels with different cross-linker densities: Scaling behavior of the network fluctuations in the vicinity of the volume phase transition
Zitatschlüssel karg13
Autor Karg, M. and Prevost, S. and Brandt, A. and Wallacher, D. and v. Klitzing, R. and Hellweg, T.
Buchtitel Intelligent Hydrogels
Seiten 63-76
Jahr 2013
ISBN 978-3-319-01682-5
DOI 10.1007/978-3-319-01683-2_6
Adresse Thermoresponsive microgel particles made of the monomer N-isopropylacrylamide (NIPAM) and the cross-linker molecule N,N’-methylenebisacrylamide (BIS) were synthesized using three different cross-linker molar ratios. The volume phase transition behavior of these colloids was investigated by means of dynamic light scattering (DLS) and small angle neutron scattering (SANS) covering the different length scales of interest. Both methods provide the temperature of the volume phase transition in good agreement. The volume change as followed by DLS is described using the Flory-Rehner theory, leading to the determination of the spinodal temperature. Furthermore, the network correlation length ?, which is available from appropriate fits of the measured SANS profiles, was used to study the critical behavior in terms of scaling laws. The results from DLS and SANS show a strong cross-linker density dependence.
Journal Progr. Coll. Pol. Sci.
Verlag Springer International Publishing
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