Water dynamics in a concentrated poly(N-isopropylacrylamide) solution at variable pressure

15 May 2019, 19:00
3h
Institute of Advanced Study (TUM Campus Garching)

Institute of Advanced Study

TUM Campus Garching

Lichtenbergstraße 2a, 85748 Garching

Speaker

Mr Bart-Jan Niebuur (TU München, Physik-Department, Fachgebiet Physik weicher Materie)

Description

Using quasi-elastic neutron scattering, we study the pressure-dependent hydration behavior of an aqueous poly(N-isopropylacrylamide) solution during heating through its cloud point (CP). At high pressure, the hydration water diffuses more rapidly than at low pressure, which indicates enhanced hydrophobic hydration. An abrupt dehydration, mainly of the hydrophobic groups, is observed at the CP at low pressure, whereas both hydrophilic and hydrophobic groups dehydrate gradually at high pressure.

Primary authors

Mr Bart-Jan Niebuur (TU München, Physik-Department, Fachgebiet Physik weicher Materie) Wiebke Lohstroh Dr Marie-Sousai APPAVOU (Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH) Alfons Schulte (University of Central Florida) Christine Papadakis (Technische Universität München, Physik-Department, Fachgebiet Physik weicher Materie)

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