Authors Rauch, S. ; Uhlmann, P. ; Eichhorn, K.-J.
Title In situ spectroscopic ellipsometry of pH-responsive polymer brushes on gold substrates
Date 11.11.2013
Number 38067
Abstract The dynamic and reversible switching behaviour of polyelectrolyte brushes of poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) toward changes of the pH value was studied by in situ VIS-spectroscopic ellipsometry (SE). For this, PDMAEMA brushes with three different molecular weights were synthesized via the “grafting from” method using surface initiated atom transfer radical polymerization. In detail, the applicability of different SE data modelling to describe the optical properties of the different brush layers in the swollen and collapsed state was investigated. Especially for the PDMAEMA brushes with a high molecular weight, an improved optical modelling of the experimental data could be achieved and revealed an exponential distribution of the PDMAEMA fraction in the brush layer.
Publisher Analytical and Bioanalytical Chemistry
Citation Analytical and Bioanalytical Chemistry 405 (2013) 9061-9069
Tags smart surfaces polymer brushes thin films spectroscopic ellipsometry polyelectrolyte brushes swelling behavior grafting density temperature adsorption layers model

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