Polystyrene colloidal crystals: Interface controlled thermal conductivity in an open-porous mesoparticle superstructure
| Autor: | Pia Ruckdeschel, Fabian A. Nutz, Markus Retsch |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
business.industry Nanotechnology Cubic crystal system Colloidal crystal Laser flash analysis Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry Thermal conductivity Chemical engineering chemistry Thermal insulation Interfacial thermal resistance Polystyrene business Porosity |
| Zdroj: | Journal of Colloid and Interface Science. 457:96-101 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2015.06.022 |
| Popis: | Colloidal crystals typically consist of sub-micron sized monodisperse particles, which are densely packed on a face centered cubic lattice. While many properties of this material class have been studied over the past decades, little is known about their thermal transport properties. The high amount of interfaces and their small interparticle contact area should result in efficient thermal insulation. Using laser flash analysis we report for the first time on the temperature dependent thermal conductivity of a freestanding 366 nm polystyrene (PS) colloidal crystal. Macroscopic monoliths of these samples were fabricated by colloidal self-assembly. We demonstrate a very low thermal conductivity κ of 51 mW K −1 m −1 ( κ of bulk PS ∼ 140 mW K −1 m −1 ). Remarkably, this low thermal conductivity is reached at a comparatively high density of 750 kg m −3 . It can be further increased by almost 300% upon film formation and loss of the colloidal mesostructure. Additionally, this open porous structure is largely independent of the surrounding atmosphere. This can be rationalized by the small size (∼100 nm) of the pores present within this colloidal crystal. |
| Databáze: | OpenAIRE |
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