Jae-Ok Lee

Suppression of scar formation in a murine burn wound model by the application of non-thermal plasma

Suppression of hypertrophic scar generation in an animal model by treatment with plasma is reported. Contact burn following mechanical stretching was used to induce scar formation in mice. Exposure to the plasma tended to reduce the scar area more rapidly without affecting vitality. The treatment resulted in decreased vascularization in the scar tissue. Plasma-treated scars showed mild decrease in the thickness of hypertrophic tissues as shown by histological assessment. Finally, we showed that plasma treatment induced cell death and reactive oxygen species generation in hypertrophic scar fibroblast. All of the results support that plasma treatment can control scar generation.

CF 4 Treatment Characteristics using an Elongated Arc Reactor

removal characteristics were investigated using an elongated arc reactor. The advantage of the elongated arc reactor includes direct use of treated gas as plasma operating gas and the enhancement of the removal reaction by using a thermo-chemistry and a plasma induced chemistry at the same time. Geometrical configurations, such as the length of the reactor and the shape of a throat, were tested to get an optimized removal efficiency with low power consumption. As results, over 95% of removal was obtained with 300 lpm of total flowrate for various concentration (0.1~1%). Corresponding specific energy density (SED), which means required electrical energy to treat the unit volume of treated gas, is about 3.5 kJ/L, The present technique can be applied to real applications by satisfying three major concerns, those are the high flowrate of treated gas, high removal efficiency (> 95%), and low power consumption (

Influence of Discharge Voltage-Current Characteristics on CO 2 Reforming of Methane using an Elongated Arc Reactor

Reforming of methane with carbon dioxide has been carried out using a bipolar pulse driven elongated arc reactor operating at atmospheric pressure and non-equilibrium regime. This plasma reactor is driven by two kinds of power supply, characterized by different voltage-current characteristics under the same operating power and frequency. Varying the ratio and the discharge power, the conversion rate, yield, and reforming efficiency for the two power supplies are investigated in conjunction with the static and dynamic behaviors of voltage and current. It is found that not only the values of voltage and current but also their shapes give an influence on the reforming performances. Finally, a better electrical operation regime for the efficient plasma reforming is proposed based on the relationship between the voltage-current characteristics and the reforming performance.

Abatement of CF 4 Using RF Plasma with Annular Shape Electrodes Operating at Low Pressure

Abatement of perfluorocompounds (PFCs) used in semiconductor and display industries has received an attention due to the increasingly stricter regulation on their emission. In order to meet this circumstance, we have developed a radio frequency (RF) driven plasma reactor with multiple annular shaped electrodes, characterized by an easy installment between a processing chamber and a vacuum pump. Abatement experiment has been performed with respect to CF4, a representative PFCs widely used in the plasma etching process, by varying the power, CF4 and O2 flow rates, CF4 concentration, and pressure. The influence of these variables on the CF4 abatement was analyzed and discussed in terms of the destruction & removal efficiency (DRE), measured with a Fourier transform infrared (FTIR) spectrometer. The results revealed that DRE was enhanced with the increase in the discharge power and pressure, but dropped with the CH4 flow rate and concentration. The addition of small quantity of O2 lead to the improvement of DRE, which, however, leveled off and then decreased with O2 flow rate.