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Adhesion and Stability Increased Carbon Nanowall for the Application to Lithium-Ion Batteries
Tran Thi May,Lee Seokwon,Choi Wonseok 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.6
Carbon nanowalls are used as electrodes for second batteries because of the widest reaction surface area among the carbonbased nanomaterials, but their practical application is limited due to the disadvantages of adhesion and stability to lithium-ion batteries. In this research, titanium, titanium nitride, and chromium layers were used as an interlayer between the copper foil and the carbon nanowalls in order to increase the adhesive force and stability. The interlayer was deposited on the substrate using a radio frequency (RF) magnetron sputtering system with a four-inch Ti, TiN, or Cr target. The carbon nanowalls are then grown on interlayer-coated copper foil using a plasma-enhanced chemical vapor deposition (PECVD) system and used as a charge collector for lithium-ion batteries. The middle layer of each sample was identifi ed using a fi eld emission scanning electron microscope (FE-SEM). Impedance measurement and charge/discharge tests were performed to evaluate the characteristics of a lithium-ion battery. Based on the results of this experiment, it was noticed that the research goal can be achieved by inserting the mentioned intermediate layers, and CNWs synthesized on TiN interlayers present the best capacity retention measurement results, which is critical for the future development of lithium-ion batteries.
Nguyen Huu Nghia,Nguyen Thi Nguyen,Phan Trong Binh,Le Thi May,Tong Tran Huy,Pham Thai Giang,Sophie St-Hilaire,Phan Thi Van 한국수산과학회 2022 Fisheries and Aquatic Sciences Vol.25 No.8
This study assessed the effects of oxygen and ozone nanobubbles on gill morphology, weight gain, and mortality of Pacific white shrimp (Penaeus vannamei), as well as the level of Vibrio parahaemolyticus and water quality of shrimp culture tanks under lab conditions. Two experiments were carried out with oxygen macrobubble, ozone macrobubble, oxygen nanobubble, ozone nanobubble, and control treatments (air-stone macrobubble). Experiments were done in triplicate in 100 L tanks with 15‰ saline water, and 20 shrimp per tank. Tanks in Experiment 1 were not inoculated with bacteria; tanks in Experiment 2 were inoculated with V. parahaemolyticus at a concentration of 106 CFU/mL. The results revealed that short treatments with ozone nanobubbles had minimal impact on shrimp gills, mortality, and growth rates, reduced V. parahaemolyticus concentration in water compared to the other groups, and improve water quality. These laboratory results indicate that ozone nanobubble treatment may be useful for controlling V. parahaemolyticus. More work is needed to find the best protocol to apply the technology on a commercial scale.