Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 44: Charged Soft Matter I
CPP 44.2: Vortrag
Donnerstag, 3. April 2014, 09:45–10:00, ZEU 118
Inhomogeneous swelling of Polyelectrolyte Multilayers in water — •Maximilian Zerball1, Ralf Köhler2, and Regine von Klitzing1 — 1Institut für Chemie - Stranski-Laboratorium, Technische Universität Berlin, Str. 17.Juni 124, 10623 Berlin — 2Institut für Weiche Materie und funktionelle Materialien, Helmholtz-Zentrum Berlin, Hahn - Meitner-Platz 1, 14109 Berlin
Polyelectrolyte Multilayer (PEM) are organic films built up via subsequent adsorption of oppositely charged polyions. They are interesting materials for nanofabrication and fundamental science due to the possible and precise tunability of there physico-chemical properties, as thickness roughness, or adsorption of molecules and particles. PEM are highly sensitive to external parameter like the relative humidity (RH) of the ambient atmosphere. Increase of RH causes water uptake and swelling, accompanied with changes of the permeability for water. In order to use these films as sensors of for optical devices it is important to understand and to control the swelling mechanism. Neutron Reflectometry (NR) is an excellent tool to investigate the inner structure of PEMs. The usage of PEMs consisting of two different blocks, a deuterated block and a protonated block creates an additional surface inside the PEM which is detectable for NR and allows detecting an inner and an outer part of the sample, but with chemically identical composition. The results show an inhomogeneous swelling across the PEM.