Effective calcium phosphate radiative cooling materials
AssigneesNortheastern University, Planck Energies Inc.
InventorsAndrew Caratenuto, Yi Zheng, Nathaniel LeCompte
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Abstract
Disclosed herein are highly solar-reflective passive radiative cooling materials in powder form based on calcium phosphates. These materials can be synthesized at a low material cost approaching that of paint additives available on the market, and they are safe, non-toxic, and environmentally-friendly. These materials achieve solar reflectance values ranging from 93% to nearly 98%, making them extremely effective passive radiative cooling materials.
Claims30
A material, comprising one or more calcium phosphates, wherein the material is a polydisperse powder comprising a plurality of particles of differing sizes.
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A process of preparing a solar reflective material, comprising:
- i) combining a first solution comprising a calcium-containing reagent with a second solution comprising a phosphate-containing reagent at a reaction temperature and a reaction pH, thereby producing a calcium-phosphate mixture comprising calcium-phosphate;
- ii) allowing the calcium phosphate to precipitate from the calcium-phosphate mixture;
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- iii) calcining the calcium phosphate,
- thereby producing the solar reflective material.
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Dependencies are inferred from the claim text.