464689 B-C and B-Fe Core-Shell Nanoparticles for the Enhancement of Biofuel Combustion
In this study, we synthesized core-shell Boron-Carbon (B-C) and Boron-Iron (B-Fe) nanoparticles for the combustion of ethanol. A variety of templated, non-templated, and wet-chemical techniques were used to produce elemental boron (zero valent) with either a carbon or iron shell. The composites were characterized by N2 Physisorption, TGA/DSC, ICP/AES, XRD, SEM/EDX, TEM, and SAXS. The composites had surface areas from 20-150 m2/g, pore sizes from 5-40 nm, and shell thicknesses between 5-20 nm. Boron was well-distributed and mostly amorphous, indicating that reactions with iron or carbon were minimal. The combustion properties with ethanol were determined through batch combustion in a calorimeter. The B-C and B-Fe composites lowered ignition temperatures and raised the rate of fuel conversion in almost all cases. The best B-C composites were synthesized with polymer templates and had relatively large shell thicknesses and pore sizes that positively affected oxygen transport. The best B-Fe composites could be broken down into smaller particles, which is beneficial when fluidized in a ramjet combustor.
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