Dresden 2017 – wissenschaftliches Programm
CPP 49.7: Poster
Mittwoch, 22. März 2017, 18:30–21:00, P2-OG1
Towards functionally graded latex films: preparation using plasma-electrochemistry during drying — Sebastian Hochstädt1, Alexander Müller1, •Heike Römermann1, Oliver Höfft2, Frank Endres2, and Diethelm Johannsmann1 — 1Institute of Physical Chemistry, Clausthal University of Technology, Arnold-Sommerfeld-Str. 4, 38678 Clausthal-Zellerfeld — 2Institute of Electrochemistry, Clausthal University of Technology, Arnold-Sommerfeld-Str. 6, 38678 Clausthal-Zellerfeld
Coatings with functionality varying from top to bottom have widespread applications. One way to achieve such gradients is surface treatment on dry films, for instance with a plasma or a flame. Here, we report on plasma treatment of wet films during drying. Both reductive and oxidative plasmas were used. In the first case, we employed a cold atmospheric argon plasma jet. The latex films contained metal salts, which, upon reduction, formed metal particles (copper and silver) on top of the film, or reduced potassium hexacyanoferrate (III) to change its color. These were studied with optical microscopy, SEM, and CLSM. Such particles can find applications as biocides. In the second case, an oxidative atmospheric DBD plasma was used to create a vertical gradient in the concentration of red potassium hexacyanoferrate (III) across the film. The salt had been introduced into the film in its yellow form and was oxidized to the red form. The gradient was qualitatively analyzed using UV-VIS spectroscopy and optical microscopy.