Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 1: Focus: Morphology of Complex Polymer Mesophases: From Experiment to Modelling - organized by Kostas Daoulas and Volker Abetz

CPP 1.3: Vortrag

Montag, 1. April 2019, 10:30–10:45, H14

Optimum Disorder of Polymer Mesoparticle Aggregates for Efficient Thermal Insulation — Fabian Nutz¹, Alexandra Philipp¹, Bernd Kopera¹, Martin Dulle², and •Markus Retsch¹ — ¹Physical Chemistry I, University of Bayreuth, 95447 Bayreuth, Germany — ²JCNS-1/ICS-1: Neutron Scattering Forschungszentrum, Juelich, Germany

Heat transport plays a critical role in modern batteries, electrodes, and capacitors. This is caused by the ongoing miniaturization of such nano-technological devices, which increases the local power density and hence temperature. Even worse, the introduction of heterostructures and interfaces is often accompanied by a reduction in thermal conductivity, which can ultimately lead to the failure of the entire device. Surprisingly, a fundamental understanding of the governing heat transport processes even in simple systems is still missing. This contribution closes this gap and elucidates how strongly the morphology of a model particulate system influences the effective thermal conductivity across such a complex mesostructure. In a combined experimental and modeling approach, well-defined mixtures of monodisperse particles with varying size ratios were investigated. The transition from order to disorder can reduce the effective thermal conductivity by as much as ~50%. This is caused by an increase in the thermal transport path length and is governed by the number of inter-particle contact points.