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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 22: Biopolymers and Biomaterials (jointly with BP)

CPP 22.6: Vortrag

Mittwoch, 24. März 2010, 15:45–16:00, H37

Influence of humidity on casein films - an in situ investigation with a combination of µGISAXS and imaging ellipsometry — •Volker Körstgens¹, Robert Meier¹, Johannes Wiedersich¹, Jan Perlich², Stephan Volkher Roth², and Peter Müller-Buschbaum¹ — ¹TU München Physikdepartment LS E13, James-Franck-Str. 1, D-85747 Garching — ²HASYLAB at DESY, Notkestr. 85, D-22607 Hamburg

Glues based on casein are known since ancient Egypt. Nowadays casein-based adhesives are being used in versatile labeling applications. Already pure casein shows adhesive properties depending on humidity as shown with tack experiments in this work. The structural changes of thin casein films are investigated in situ with a combination of µGISAXS (grazing incidence small angle x-ray scattering with a µm-sized beam) and imaging ellipsometry. With this new instrument [1] built up at HASYLAB, DESY, Hamburg, a comprehensive sample characterization is possible including local film thickness and optical properties combined with structural information with a spatial resolution depending on the size of the x-ray beam. Swelling and drying cycles with casein thin films are performed in situ and the relation between structure and adhesive properties is discussed.

[1] V. Körstgens et al., Anal. Bioanal. Chem., DOI 10.1007/s00216-009-3008-1

This project is financially supported by BMBF grant 05KS7WO1.