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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Degradation model of solar radiation damage to optical properties of zinc oxide pigments used for spacecraft thermal control coatings
Mechanisms of solar radiation damage to optical properties in zinc oxide pigments in visible and infrared regions
Solar wind environmental effects upon particulate radiation induced absorption bands in spacecraft thermal control coating pigments
Induction plasma heating techniques used to calcinate pigment particles for thermal control coatings
Simulated solar wind environment effects on zinc oxide/potassium silicate and lanthanum oxide/ potassium silicate spacecraft thermal control coating pigments
UV irradiation effects on ZnO spacecraft thermal control coating pigments, discussing photo-Hall, luminescence and electron paramagnetic resonance measurements
Control of vapor phase reaction kinetics to produce pigments by homogeneous nucleation
Theoretical models and spectral reflectance measurements of white pigmented, low solar absorptance coatings for spacecraft temperature control
Induction plasma heating for calcining pigment particles in thermal control coatings
Preparation of pigments for space-stable thermal control coatings
ZnO coating pigment for spacecraft thermal control, examining UV irradiation effects on electrical properties
Reflectance measurements of irradiated specimens of zinc oxide and zinc orthotitanate white pigment materials
Induction plasma calcining of pigment particles for thermal control coatings on space vehicles
Porphyrin-like pigments in Apollo 12 lunar soil sample 12023, using spectral analysis involving fluorescence, absorption and magnetic circular dichroism spectrometry
Tissue cultures of tobacco grown for 12 weeks in contact with lunar material returned by Apollo 12 contained 21 to 35% more total pigment than control tissues. This difference is due primarily to increased chlorophyll a concentrations per gram fresh weight of tissue in experimental cultures. No differences were noted in the fresh or dry weight of the experimental and control cultures.
Separation of plant pigments which can be accomplished on thin-layer silica plates with mixture of petroleum ether, halocarbon, acetone, and polar solvent can be readily translated into dry-column technique that yields reproducible chromatograms after elution in fashion of liquid chromatography with fluorimeter as detector. Best solvent system was found to be mixture of petroleum ether, dichloromethane, acetone, and ethyl acetate.
The identification and control of vapor phase reaction kinetics to produce pigments by homogeneous nucleation were achieved. A vapor phase apparatus was designed, fabricated, and calibrated through 1800 C. Vapor phase reactions were analyzed, calculations made, and powders of alumina, rutile, zinc orthotitanate (in a mixed phase), calcium tungstate, and lanthana were produced by homogeneous nucleation. Electron microscopy shows uniform particle morphology and size, and supports anticipated advantages of vapor-phase homogeneous nucleation; namely, purity, freedom from defects, and uniform particle sizing without grinding.
Sediment from Tanner Basin, the outer continental shelf off Southern California, was analyzed for photosynthetic pigments and their derivatives, namely carotenes and chlorins. Samples of the sediment were also exposed to raised temperatures (65, 100, 150 C) for various periods of time (1 week, 1 month, 2 months). Analysis of the heat-treated sediment revealed the presence of alpha-ionene and 2,6-dimethylnapthalene, thermal degradation products of Betacarotente. Chlorins were converted to nickel porphyrins of both DPEP and etio series. Possible mechanisms of these transformations are presented.