3 ms·
Because of the material's uniquely diametric state transitions and properties, it gives itself naturally to negative feedback (self-regulating systems) -- for e
by lend000 10y ago
Because of the material's uniquely diametric state transitions and properties, it gives itself naturally to negative feedback (self-regulating systems) -- for example, as a coating in space windows that reflects more radiation as the temperature increases. Not to mention the regulation of heat/electrical conductivity which is the primary subject of the article, in which the material behaves like an exotic semiconductor:
“This material could be used to help stabilize temperature,” said study co-lead author Fan Yang, a postdoctoral researcher at Berkeley Lab’s Molecular Foundry, a DOE Office of Science User Facility where some of the research was done. “By tuning its thermal conductivity, the material can efficiently and automatically dissipate heat in the hot summer because it will have high thermal conductivity, but prevent heat loss in the cold winter because of its low thermal conductivity at lower temperatures.”
- raziel2701 10y agoI don't think this would work for coatings. The dimension and geometry of the material matter a lot and this is evidenced by the fact that they know that VO2 has normal behavior in polycrystalline thin-films. The VO2 they studied is single crystal and shaped into a nanobeam, meaning that already by geometry there's a huge shape anisotropy that I'm sure influences the properties. The beam is essentially suspended as well so it's relatively free of strain. Honestly I don't think this is going to leave the lab, you're not gonna find this behavior in bulk, only in nanoscale constructions. Also the title of this submission is wrong, heat does flow, just at a lesser magnitude than expected from the Wiedemann-Franz law.