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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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Graphite-Encapsulated Li-Metal Hybrid Anodes for High-Capacity Li Batteries
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Hydrophilic encapsulation of multi-walled carbon nanotubes using admicellar polymerization
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Hydrophobicity-driven unfolding of Trp-cage encapsulated between graphene sheets
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Geometries, stabilities, and electronic properties of tungsten encapsulated nanosize irregular B n (n = 20, 24, 28, and 32) fullerenes: A density functional investigation
Geometries associated with relative stabilities and energy gaps of W@B n (n = 20, 24, 28, 32) are systematically investigated here by density functional theory. The calculated averaged atomic binding energies reveal that the W@B 20 has enhanced stability over other clusters. Interestingly, the irregular W@B 24 fullerene with bigger HOMO–LUMO gap is supposed to have stronger chemical activity. Moreover, the interactions between W and B24 cage is strongest one based upon the calculated binding energy between W and B cage, the doped W changes the properties of pure cages. Finally, the calculated dipoles of W@B n reveal that the irregular W@B 24 cage is a nonpolar molecule.
Epoxy encapsulation of the Cernox™ SD thermometer for measuring the temperature of surfaces in liquid helium
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Experimental apparatus and methodology to test and quantify thermal performance of micro and macro-encapsulated phase change materials in building envelope applications
Thermal energy storage (TES) is used as a viable technology to shift peak electricity demand caused by the space cooling requirements in buildings. Passive TES is implemented in building envelope via micro and macroencapsulation methods. This study describes the use of a state-of-the-art laboratory to test different PCM inclusions in simplified building walls. A microencapsulated PCM and two macroencapsulated PCMs are tested in a controlled environment to gather data for validation purposes of PCM modelling algorithms in building energy modelling programs. Data indicates that the chamber environment and the heating and cooling system can conduct full-cycle tests of wall panels with PCM inclusions. This study also generates data from parallel tests on 4 wall panels which can be used in building energy modelling programs to validate the PCM modelling algorithms. The cyclic tests also capture the thermal effects of PCMs and complex PCM behaviors like sub-cooling in PCM hydrate-salts.
Ordered hydrocolloids networks as delivery vehicles of nutraceuticals: Optimal encapsulation of curc
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Multi-mode heat transfer analysis during freezing of an encapsulated storage medium
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IImprove hydrogen sorption kinetics of MgH2 by doping carbon-encapsulated iron-nickel nanoparticles
Magnesium hydride (MgH2) with excellent hydrogen storage kinetics is important for the wide application of hydrogen energy. Herein, to accelerate the sorption kinetics of MgH2 and lower its dehydrogenation temperature, we design and prepare a carbon film coated dual transition metal alloy, the Fe0.64Ni0.36@C composite with a coreshell structure, and employ it as an additive to synthesize MgH2–Fe0.64Ni0.36@C system by ball-milling and hydriding combustion method. In contrast to pure MgH2, the initial hydrogen release temperature of the MgH2–Fe0.64Ni0.36@C composite lowers to 250°C from 480°C and the composite can absorb 5.18 wt% H2 within 20 min (150°C, 3 MPa H2). More importantly, the apparent activation energy of the dehydrogenation for decomposition of Fe0.64Ni0.36@C-doped MgH2 reduced from 162.8 ± 8.3 kJ/mol to 86.9 ± 4.6 kJ/mol. It is believed that the Fe@C and Mg2Ni/Mg2NiH4 formed on the surface of Mg/MgH2 act as intermediates of electron transfer between Mg2+ and H–, which synergistically enhanced the hydrogen absorption and desorption kinetics properties of the MgH2. Moreover, the MgH2 co-doped with the multiple in-situ formed active particles shows excellent cycling performance, indicative of potential application in practical hydrogen storage in the near future.