서지주요정보
초음속 유동에서 코로나 방전을 이용한 금속 나노 입자의 생성 = Metallic nano particle generation by supersonic nozzle with corona discharge
서명 / 저자 초음속 유동에서 코로나 방전을 이용한 금속 나노 입자의 생성 = Metallic nano particle generation by supersonic nozzle with corona discharge / 정재희.
저자명 정재희 ; Jung, Jae-Hee
발행사항 [대전 : 한국과학기술원, 2004].
Online Access 비공개원문

소장정보

등록번호

8014963

소장위치/청구기호

학술문화관(문화관) 보존서고

MME 04065

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

The effects of additive ions on the generation of metallic nanoparticles were evaluated using a corona induced supersonic nozzle. Applying the corona discharge to the nanoparticle generator, a tungsten needle and the supersonic nozzle are used as an anode electrode and a cathode electrode respectively. The corona ions act as nuclei for the silver vapor condensation. The ion density was controlled precisely as varying the applied voltage between electrode and nozzle. The nanoparticle generator consists of two chambers; an evaporation chamber and a deposition chamber. Two chambers are separated by the supersonic nozzle of 0.5 mm throat diameter. Our experiments performed at the crucible temperature of 1030 ℃, the evaporation chamber pressure of 2.4torr, and the deposition chamber pressure of 0.016torr. Ar is selected as carrier gas, which flow rate is fixed at 8.9e-5 g/sec. Silver powder of 0.2mm is used as a metal vapor source, and it is supplied to the carrier gas as the mole fraction ratio of 0.04. ion current (0.41, 0.61, 0.72 μ A). Ejected current, which varies from 0.41 to 0.72 μ A as increasing the applied voltage, is measured from the difference between total current and leakage current. To measure the size distribution and the mean diameter of silver particles, TEM(transmission electron microscopy) and SEM(scanning electron microscopy) images were taken. The mean diameter of the silver particle decreases as the ion density increases. However, the number concentration of the silver particle tended to increase with the ion density. The size distribution is more uniform as the ion density increases.

서지기타정보

서지기타정보
청구기호 {MME 04065
형태사항 xiii, 86 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jae-Hee Jung
지도교수의 한글표기 : 김상수
지도교수의 영문표기 : Sang-Soo Kim
학위논문 학위논문(석사) - 한국과학기술원 : 기계공학전공,
서지주기 참고문헌 : p. 43-45
주제 나노입자
코로나 방전
초음속 노즐
nano particle
corona discharge
supersonic nozzle
QR CODE qr code