Regensburg 2019 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Glasses and Glass Transition (joint session CPP/DY)

CPP 16.4: Talk

Monday, April 1, 2019, 17:00–17:15, H8

Tuning the Temperature-Dependent Thermal Conductivity via Complex Colloidal Superstructures — Fabian Nutz and •Markus Retsch — Physical Chemistry I, University of Bayreuth, 95447 Bayreuth, Germany

The ability to specifically tune the temperature dependence of the thermal conductivity possess a vital challenge to develop and conceive future heat management devices. In this contribution, we demonstrate the vast potential of polymer colloidal crystals to address and master these challenges. We achieve this goal based on the constriction controlled thermal transport through well-defined colloidal crystal superstructures.[1,2,3,4] These colloidal superstructures are specifically built by tailor-made latex particles with distinct glass transition temperatures. We exploit their multiresponsive film formation at various temperatures to demonstrate unprecedented control over thermal conductivity at temperatures between 25 °C and 200 °C. Based on the film formation process, we can irreversibly increase the thermal conductivity by a factor of about three. We show how to control: i) the temperature, where the increase in thermal conductivity happens ii) the sharpness of the thermal conductivity increase iii) the height of the increase in thermal conductivity iv) the incorporation of a multistep increase in thermal conductivity

[1] Nutz et al. J. Colloid Interface Sci. 2015, 457, 96. [2] Ruckdeschel et al, Nanoscale 2015, 7, 10059. [3] Nutz et al, Phys. Chem. Chem. Phys. 2017, 19, 16124