Abstract
Mechanisms for fabrication of carbon nanomaterials by arc discharge in low-temperature liquid such as liquid helium has been investigated. In particular, bubble behavior at the arc discharge using open and close discharge. When electrodes were closed, small light emission appeared with bubbles. Then, the emission intensity increased rapidly while bubble formation increased slightly. After that light emission disappeared and bubbles decreased. We also captured photographs to characterize the degree of discharge voltage and liquid temperature. The results suggest that all of them were almost same in the liquid helium, liquid nitrogen at the discharge voltage of larger than 20V. When discharge voltage is 10V in superfluid liquid helium, the bubble repeated contraction on low frequency and then it disappeared several seconds afterward. This phenomenon was observed only in superfluid liquid helium, and they dependent on discharge voltage.
