black phosphorus उदाहरण वाक्य

उदाहरण वाक्य

1. In the liquid exfoliation method first reported by Brent et al . in 2014 and modified by others, bulk black phosphorus is first ground in a mortar and pestle and then sonicated in deoxygenated, anhydrous organic liquids such as NMP under inert atmosphere using low-power bath sonication.
2. The solution is then centrifuged twice, first for 10 minutes to remove any unexfoliated black phosphorus and then for 20 minutes at higher speed to separate thick layers of phosphorene ( 5 12 layers ) from NMP . The supernatant then is centrifuged again at higher speed for another 20 minutes to separate thinner layers of phosphorene ( 1 7 layers ).
3. When it is converted to the covalent red phosphorus, the density goes to 2.2 2.4 g / cm 3 and melting point to 590 �C, and when white phosphorus is transformed into the ( also covalent ) black phosphorus, the density becomes 2.69 3.8 g / cm 3 and melting temperature ~ 200 �C . Both red and black phosphorus forms are significantly harder than white phosphorus, and whereas white phosphorus is an insulator, the black allotrope, which consists of layers extending over the whole crystal, does conduct electricity.
4. When it is converted to the covalent red phosphorus, the density goes to 2.2 2.4 g / cm 3 and melting point to 590 �C, and when white phosphorus is transformed into the ( also covalent ) black phosphorus, the density becomes 2.69 3.8 g / cm 3 and melting temperature ~ 200 �C . Both red and black phosphorus forms are significantly harder than white phosphorus, and whereas white phosphorus is an insulator, the black allotrope, which consists of layers extending over the whole crystal, does conduct electricity.