Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 25: Focus: Functional Polymer Hybrids II
CPP 25.3: Vortrag
Dienstag, 8. März 2016, 14:45–15:00, H51
Thermal Transport in Colloidal Crystals and Assemblies — Fabian A. Nutz1, Pia Ruckdeschel1, Alexandra Philipp1, Tobias Kemnitzer2, Jürgen Senker2, and •Markus Retsch1 — 1Physical Chemistry - Polymer Systems, University of Bayreuth, 95447 Bayreuth, Germany — 2Inorganic Chemistry III, University of Bayreuth, 95447 Bayreuth, Germany
We will present our latest results on thermal transport phenomena in colloidal materials, which are structured on length scales that bridge 10 nm up to 1 um. We will particularly introduce two examples of so-called colloidal crystals, which comprise either monodisperse polystyrene particles, composite core/shell spheres, or hollow silica capsules. While being entirely amorphous on a local scale, colloidal crystals feature opalescent colors due to their highly crystalline order on a couple of 100 nm. Such systems are well suited to investigate fundamental structural changes on an individual particle level and their influence on the effective thermal conductivity of the colloidal superstructure. We demonstrate the influence of microporosity and interfacial adhesion to the thermal transport in silica hollow spheres.[1] Polymer colloidal crystals are insensitive to their surrounding atmosphere but exhibit a strong hysteresis upon film formation.[2] [1] P. Ruckdeschel, et al., Nanoscale, 2015, 7, 10059 [2] F. A. Nutz, et al., J. Coll. Interf. Sci., 2015, 457, 96