Regensburg 2019 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster Session I
CPP 17.19: Poster
Monday, April 1, 2019, 17:30–19:30, Poster B1
Time-resolved X-ray scattering for the study of colloidal thin films — •Christopher Greve1, Michael Buchhorn1, Dinesh Kumar2, Guillaume Freychet2, Alexander Hexemer2, Lutz Wiegart3, and Eva M. Herzig1 — 1Universität Bayreuth, Universitätsstr. 30, 95447 Bayreuth, Germany — 2ALS, Lawrence Berkley National Lab, 1 Cyclotron Road, Berkeley CA 94270, USA — 3NSLSII, Brookhaven National Lab, Brookhaven Avenue, Upton NY, USA
X-Rays are a useful tool to investigate the dynamics and the morphology of hard and soft condensed matter. Synchrotron radiation makes it possible to probe short length scales (< 100 nm) and long time scales (>10−4 s). To obtain information about the underlying dynamics, during thin film formation, time-resolved measurements are investigated. We investigate slot-die coated thin films in situ in gracing incident geometry to gain insights into the underlying processes of thin film formation. For printing, an up-scalable printer setup is used and as a model system a drying colloidal suspension is examined. Such suspensions are widely used to investigate lattice growth, which is a technologically important research topic (e.g. programmable matter). As a model system, silica nanospheres are used. These feature under solvent evaporation a Kirkwood-Alder transition from amorphous to crystalline FCC thin films via an intermediate glass phase. In addition, a known Bain transition from FCC to BCC can take place under annealing. Using different experimental settings, we systematically study the effect of multiple scattering on the extracted dynamics of drying thin films to investigate the mentioned transitions.