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Bulk phase and surface dynamics of PEG microgel particles
Citation key gawl15
Author Gawlitza, K. and Ivanova, O. and Holderer, O. and Radulescu, A. and von Klitzing, R. and Wellert, S.
Pages 5807–5815
Year 2015
DOI 10.1021/acs.macromol.5b00788
Journal Macromolecules
Volume 48
Number 16
Abstract The adsorption of ethylene glycol (EG) based microgel particles at silicon surfaces was studied. Monodisperse p-MeO2MA-co-OEGMA microgel particles were synthesized by precipitation polymerization. Translational and inner dynamics of p-ME3O5 and p-ME3O26 microgels in bulk were investigated by dynamic light scattering (DLS) and neutron spin echo spectroscopy in transmission geometry (NSE). Here, cooperative diffusion and Zimm type dynamics were observed. The inner dynamics of these microgel particles in adsorbed state was explored by neutron spin echo spectroscopy under grazing incidence (GINSES). The reported GINSES experiments demonstrate the feasibility of these surface sensitive measurements. It indicates a slowing down of the inner dynamics in the vicinity of the substrate. At increasing distance from the substrate, the relaxation is comparable to the bulk.
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