Controlled formation of barium fluoride nanocrystals by electric-assisted phase separation and precipitation

Abstract

This work demonstrated that barium fluoride (BaF 2 ) nanocrystals can be controllably formed by an electric-assisted phase separation and precipitation method, EAPSP, in a water/ethanol mixture.Experimentally, we employed an electrostatic generator to provide various voltages to reduce the surface tension of a water/ethanol mixture to cause rapid phase separation after which BaF 2 nanocrystals formed and precipitated under control. Results showed that the average diameter of the formed BaF 2 nanocrystals was reduced with the voltage increase, e.g. the 0 V sample at about 70 nm in diameter, the 500 V sample at 50 nm in diameter and the 1000 V sample at 30 nm in diameter. The conductivity of these nanocrystals was found to increase with the decrease in size.

Graphene Nanoribbons from Electrostatic-Force-Controlled Electric Unzipping of Single- and Multi-Walled Carbon Nanotubes

“…The as-received SWCNT and MWCNT were dispersed in a metal vessel with 150 mL of distilled water at a concentration of 0.1 (0.15 g of CNT) or 1 wt % (1.50 g of CNT), respectively. After ultrasonic dispersion of about 1 h, an EG was used to provide a fixed voltage at 20 kV by taking two electrodes with opposite charges and alternatively linking them to the metal vessel and the CNT/water solution, respectively, as described in Figure , corresponding to the EF in enhancement or reduction, respectively. − As can be understood, the positive electrode linked to the metal reactor and the negative electrode linked to the CNT/water solution would enhance the EF and the alternated linking would reduce the EF, respectively.…”