Regensburg 2016 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 28: Poster - Complex Fluids, Granular Matter, Glasses
DY 28.17: Poster
Dienstag, 8. März 2016, 18:15–21:00, Poster C
Spherical core-shell colloids with multiple cores as probes for rotational dynamics — Stefan Schütter1, •Nicolai Sänger1, Jörg Roller2, and Patrick Pfleiderer2 — 1Universität Konstanz Fachbereich Chemie — 2Universität Konstanz Fachbereich Physik
We introduce two new types of spherical probe particles for investigating rotational dynamics in colloidal fluids and solid states. The particles are tailormade for confocal fluorescence microscopy and coherent anti-Stokes Raman scattering (CARS) microscopy in three dimensions. CARS microscopy is a non-linear technique for tracking non-labeled colloids by generating signal of different polymer materials.[1,2] CARS methods, on the one hand, do not suffer from photobleaching and are attractive alternatives for longterm observations. On the other hand, two-color fluorescence of the cores provides robust access to the rapid determination of the particles* orientation. The two-color labeling strategy is beneficial to be able to observe the full 360 degree rotational movement of single colloidal clusters in contrast to other core-shell geometries where only angles of 180 degrees are accessible. It has already been shown for non-spherical single-color clusters that coupling effects for translational as well as rotational diffusion for different particle volume fractions are of high interest.[3] The choice of materials permits specific experiments for addressing diverse phenomena where rotation plays an important role.
[1] M. Müller and A. Zumbusch, ChemPhysChem, 2007, 8, 2156-2170. [2] M. K. Klein et al., Langmuir, 2014. [3] G. L. Hunter et al. Opt. Express, 2011, 19, 17189-17202.