Solar spectral optical properties of pigments--Part II: survey ofcommon colorants
Various pigments are characterized by determination ofparameters S (backscattering) and K (absorption) as functions ofwavelength in the solar spectral range of 300 to 2500 nm. Measured valuesof S for generic titanium dioxide (rutile) white pigment are in roughagreement with values computed from the Mie theory, supplemented by asimple multiple scattering model. Pigments in widespread use areexamined, with particular emphasis on those that may be useful forformulating non-white materials that can reflect the near-infrared (NIR)portion of sunlight, such as the complex inorganic color pigments (mixedmetal oxides). These materials remain cooler in sunlight than comparablecolors. NIR-absorptive pigments are to be avoided. High NIR reflectancecan be produced by a reflective metal substrate, a NIR-reflectiveunderlayer, or directly by the use of a pigment that scatters strongly inthe NIR.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE; California Energy Commission
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 929074
- Report Number(s):
- LBNL-54855-Part-II; R&D Project: EK251L; BnR: 600303000; TRN: US200812%%592
- Journal Information:
- Solar Energy Materials&Solar Cells, Vol. 89, Issue 4; Related Information: Journal Publication Date: 12/15/2005
- Country of Publication:
- United States
- Language:
- English
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