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Red amorphous selenium is obtained by precipitating selenium from a solution of selenious acid in methanol or ethanol with hydrazine or a soluble salt thereof at a temperature between about -20 C. and the freezing point of the solution. Furthermore, the stable red ...
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· Selenium (Se) is a functional element for all living organisms. Selenium nanoparticles (SeNPs) have various biological properties, ... extraction with a ball mill. The antioxidant activity (AOA) of the extract was analysed by DPPH and FRAP methods. The phenolic ...
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Selenium is applied as the cathode material of lithium/selenium (Li–Se) battery, which has high theoretical volumetric capacity density (3253 mA h·cm–3) and high output voltages. However, it has a low melting point (494 K) and a large sensitivity to thermal treatment, which often result in the phase transition between crystalline Se (trigonal phase) and amorphous Se during the charge ...
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· Two batches of selenium powder (99.9% purity, 150 μm) were milled in argon atmosphere in a shaker mill, using steel balls and a cylindrical steel vial. The ratio between the masses of the ball and the powder was 3:1. The first batch (called a-Se-1997) was milled
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Pometon , Germany) and selenium powders (99.5%, 74 m, Aldrich, Germany) in the planetary ball mill (Pulverisette 6, Fritsch, Germany) and the industrial eccentric vibratory mill ESM 656-0.5 ks (Siebtechnik, Germany) according to the reaction:
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For the fabrication of particles designed in the nanoscale structure, or the nanostructural modification of particles using mechanical grinding process, selenium powders ground by a planetary ball mill at various rotational speeds have been investigated. Structural analyses, such as particle size distributions, crystallite sizes, lattice strains and nearest neighbour distances were performed ...
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Selenium is applied as the cathode material of lithium/selenium (Li–Se) battery, which has high theoretical volumetric capacity density (3253 mA h·cm–3) and high output voltages. However, it has a low melting point (494 K) and a large sensitivity to thermal treatment, which often result in the phase transition between crystalline Se (trigonal phase) and amorphous Se during the charge
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