Dresden 2017 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 49: Poster: Surfaces, Interfaces, Thin Films, Nanostructures

CPP 49.7: Poster

Wednesday, March 22, 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.