Radiative heat pumping from the Earth using surface phonon resonant nanoparticles.
Nano Lett
; 10(2): 373-9, 2010 Feb 10.
Article
em En
| MEDLINE
| ID: mdl-20055479
ABSTRACT
Nanoparticles that have narrow absorption bands that lie entirely within the atmosphere's transparent window from 7.9 to 13 mum can be used to radiatively cool to temperatures that are well below ambient. Heating from incoming atmospheric radiation in the remainder of the Planck radiation spectrum, where the atmosphere is nearly "black", is reduced if the particles are dopants in infrared transmitting polymers, or in transmitting coatings on low emittance substrates. Crystalline SiC nanoparticles stand out with a surface phonon resonance from 10.5 to 13 mum clear of the atmospheric ozone band. Resonant SiO(2) nanoparticles are complementary, absorbing from 8 to 10 mum, which includes atmospheric ozone emissions. Their spectral location has made SiC nanoparticles in space dust a feature in ground-based IR astronomy. Optical properties are presented and subambient cooling performance analyzed for doped polyethylene on aluminum. A mixture of SiC and SiO(2) nanoparticles yields high performance cooling at low cost within a practical cooling rig.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Planeta Terra
/
Nanotecnologia
/
Nanopartículas
Idioma:
En
Ano de publicação:
2010
Tipo de documento:
Article