Polystyrene colloidal crystals: Interface controlled thermal conductivity in an open-porous mesoparticle superstructure.

摘要: Abstract Colloidal crystals typically consist of sub-micron sized monodisperse particles, which are densely packed on a face centered cubic lattice. While many properties this material class have been studied over the past decades, little is known about their thermal transport properties. The high amount interfaces and small interparticle contact area should result in efficient insulation. Using laser flash analysis we report for first time temperature dependent conductivity freestanding 366 nm polystyrene (PS) colloidal crystal. Macroscopic monoliths these samples were fabricated by self-assembly. We demonstrate very low κ 51 mW K −1  m ( bulk PS ∼ 140 mW K ). Remarkably, reached at comparatively density 750 kg m −3 . It can be further increased almost 300% upon film formation loss mesostructure. Additionally, open porous structure largely independent surrounding atmosphere. This rationalized size (∼100 nm) pores present within