Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 23: Poster: Semicrystalline Polymers, Polymer Crystallization and Self-Assembly
CPP 23.9: Poster
Dienstag, 15. März 2011, 18:00–20:00, P2
Self-aggregation of mononucleotides in solution studied by frequency resolved depolarized dynamic light scattering techniques — •Christoph Angermann1 and Thomas Hellweg2 — 1Universität Bayreuth, Physikalische Chemie 1 — 2Universität Bielefeld, Physikalische und Biophysikalische Chemie
In some cases the rotational diffusion of particles in the nanometer scale is too fast to be easily resolved with conventional photon correlation spectroscopy (PCS) methods. Therefore a custom built depolarized light scattering apparatus equipped with a confocal Fabry-Perot interferometer (FPI) with a free spectral range of 150 MHz was developed. The FPI is used to analyze the scattered light in the frequency domain. This is an important characteristic because the rotational motion of the particles modifies the depolarized component of the scattered light. The original setup was enhanced with an AOM (acousto-optic modulator) instead of mechanical shutters. Due to this enhanced measurement technique, it is easily possible to accumulate the noisy component efficiently leading to an enhancement of the signal to noise ratio. As a proof of principle for the experimental technique we studied interesting self-assembly of mononucleotides in aqueous solution. Self-aggregation phenomena as well as the interaction of the mononucleotides uridine-5'-monophosphate and cytidine-5'-monophosphate can be analyzed precisely.