Dresden 2017 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 15: Poster: Membranes, Biomaterials, Biopolymers
CPP 15.4: Poster
Montag, 20. März 2017, 18:30–21:00, P1C
Optical studies of thermal properties of materials — •David Schönebeck1, Jonas Pfeil1, Anna Sailer2, Martin Müller1, Kay-E. Gottschalk1, and Masoud Amirkhani1 — 1Institut für experimentelle Physik, Universität Ulm, D-89069 Ulm — 2Wissenschaftliche Werkstatt Feinwerktechnik, Universität Ulm, D-89069 Ulm
Polymeric materials adsorb on suspended gold nano particle (GNP) surfaces depending on their solubility behavior in the surrounding medium. GNP have an optical absorption maximum in the visible range. This is where they heat up and can act as point heat sources to their environment. Exploiting this, one can control the solubility of UCST and LCST materials in the vicinity of GNP in the suspension. This has an influence on the hydrodynamic radius of the gold-polymer aggregates. These effects shall be studied by standard DLS investigations, thermal diffusion experiments, and later also fluorescence and fluorescence-correlation spectroscopy. The main goal of this work is to realize an experimental setup that is capable of exciting the GNP and measuring their response at the same time. We use one excitation laser near the absorption maximum and one measurement laser with lower energy pointing at the same or slightly offset position. The centerpiece of the setup is a temperature controlled glass cylinder to house the sample containers at biologically relevant temperatures. Two photon counting detectors, of which one can be rotated around the cylinder by a desired angle, detect the excitation (straight line) and the measurement (rotated) signal from the two light sources separately.