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US 8,623,499 B2Granted
Thin films including nanoparticles with solar reflectance properties for building materials
AssigneeCertainTeed Corporation
InventorEmilie Viasnoff
Life of this patent
Estimating the term…
Abstract
Disclosed are solar-reflective building materials, including roofing articles, that include nanoparticle-containing thin films; such articles display high reflectance of near-infrared radiation and high transmission of radiation in the visible light range so as to reduce the heat island effects experienced by the articles while also maintaining an aesthetically pleasing appearance. Also disclosed are related methods of fabricating such articles.
Claims30
A roofing article, comprising:
- an essentially opaque substrate at least partially surmounted by at least one thin film having an average thickness in the range of from about 20 nm to about 500 nm,
- the at least one thin film comprising at least one population of nanoparticles residing in a matrix,
- the matrix having a first refractive index,
- the at least one population of nanoparticles having a second refractive index,
- at least one of the population of nanoparticles having at least one characteristic dimension in the range of from about 10 nm to about 500 nm,
- the at least one thin film transmitting at least about 5% of radiation having a wavelength of between about 300 nm and about 700 nm, and
- the at least one thin film reflecting at least about 20% of radiation having a wavelength of between about 700 nm and about 2500 nm.
4 more elements
A method of fabricating a building material, comprising:
- disposing onto at least a portion of an essentially opaque substrate at least one thin film having an average thickness in the range of from about 20 nm to about 500 nm,
- the at least one thin film comprising at least one matrix and a population of nanoparticles,
- at least one nanoparticle having at least one average characteristic dimension in the range of from about 10 nm to about 500 nm,
- the at least one thin film transmitting from about 5% to about 100% of radiation having a wavelength of between about 300 nm and about 700 nm,
- the at least one thin film reflecting at least about 20% of radiation having a wavelength of between about 700 nm and about 2500 nm.
2 more elements
A roofing article, comprising:
- an essentially opaque substrate at least partially surmounted by a thin film having an average thickness in the range of from about 20 nm to about 500 nm,
- the at least one thin film comprising a matrix and at least one population of nanoparticles,
- at least one of the population of nanoparticles having at least one characteristic dimension in the range of from about 10 nm to about 500 nm,
- the at least one thin film transmitting at least about 5% of radiation having a wavelength of between about 300 nm and about 700 nm, and
- the at least one thin film reflecting at least about 20% of radiation having a wavelength of between about 700 nm and about 2500 nm.
2 more elements
A method of fabricating a roofing article, comprising:
- spraying a sol onto at least a portion of a shingle,
- the sol comprising a matrix and at least one population of nanoparticles,
- at least one of the population of nanoparticles having at least one characteristic dimension in the range of from about 10 nm to about 500 nm,
- processing the sol to give rise to a thin film having a thickness in the range of from about 50 nm to about 200 nm,
- the at least one thin film transmitting at least about 5% of radiation having a wavelength of between about 300 nm and about 700 nm, and
- the at least one thin film reflecting at least about 20% of radiation having a wavelength of between about 700 nm and about 2500 nm.
3 more elements
An opaque building material, comprising:
- an essentially opaque substrate at least partially surmounted by at least one thin film having an average thickness in the range of from about 20 nm to about 500 nm,
- the at least one thin film comprising at least one population of nanoparticles residing in a matrix,
- at least one of the population of nanoparticles having at least one characteristic dimension in the range of from about 10 nm to about 500 nm,
- the at least one thin film transmitting at least about 5% of radiation having a wavelength of between about 300 nm and about 700 nm, and
- the at least one thin film reflecting at least about 20% of radiation having a wavelength of between about 700 nm and about 2500 nm.
2 more elements
Dependencies are inferred from the claim text.