1. Structural and thermal properties of boron nanoparticles synthesized from B2O3 + 3Mg + kNaCl mixture.
- Author
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Yoo, Bung Uk, Nersisyan, Hayk H., Ryu, Hong Youl, Lee, Jin Seok, and Lee, Jong Hyeon
- Subjects
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BORON oxide , *NANOPARTICLE synthesis , *SALT , *AMORPHOUS substance synthesis , *EXOTHERMIC reactions , *THERMOCOUPLES , *LEACHING - Abstract
Amorphous boron nanoparticles were synthesized by heating a B 2 O 3 + 3 Mg + k NaCl ( k is the number of moles of NaCl) exothermic mixture in a laboratory oven at 800 °C under argon flow. NaCl was used as inert material to decrease the maximum combustion temperature of the reaction mixture when it was self-ignited after the melting of Mg at 650 °C. The size of the boron nanoparticles extracted from the final product by acid leaching ranged between 30 and 300 nm for k values ranging from 1 to 5. Moreover, increasing the value of k from 1 to 5 resulted in an increase in the specific surface area of the nanoparticles from 40 to 74 m 2 g −1 . However, at k = 10, a decrease in the specific surface area to 47.56 m 2 g −1 was recorded due to incomplete reduction of B 2 O 3 . The ignition point of boron nanoparticles in air as estimated using a thermocouple was approximately 300 °C. Digital camera recording of the combustion process of boron nanoparticles in air revealed that the burning speed of the nanoparticles increased significantly from 0.3 to 15 cm/s when k increased from 1 to 5. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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