• Title/Summary/Keyword: 전기-수력학적 분사

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Experimental Studies on Electrohydrodynamic Atomization of CIGS Nanoparticle Precursor (CIGS 나노입자를 포함한 전구체의 전기수력학적 분무에 관한 실험적 연구)

  • Woo, Jihoon;Yoon, Sukgoo;Kim, Hoyoumg
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.11a
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    • pp.41.1-41.1
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    • 2010
  • 전기수력학적 분무를 이용한 액적 미립화 기술은 나노사이즈의 액적 형성, 쿨롱 반발력에 의한 균일한 액적 형성, 그리고 향상된 액적 타겟팅을 가능하게 한다. 따라서 이를 이용하여 매우 균일한 박막 코팅이 가능하다. 이러한 점에 힘입어 현재 진공 공정으로 제작되고 있는 CIGS태양전지의 광흡수층을 비진공 공정중 하나인 전기수력학적 미립화를 이용하여 실험하였다. Ethanol-based 의 CIGS나노 입자를 포함하는 콜로이드 상태의 전구체를 이용하여 적절히 가열된 몰리브덴 배면 전극위에 적용하였다. 미립화한 액적은 접지된 몰리브덴 층에 부착되는 즉시 증발하여 CIGS입자를 남긴다. 여기서 가장 중요하게 다루어야 할 조건은 기판의 온도, 인가 전압, 전구체의 유량이다. 분사 모드는 Cone-jet을 적용하였으며 5~15kV의 인가 전압에서 1ml/hr내외의 유량을 공급하여 3분 이내에 적절한 광흡수층 두께인 1마이크론 내외에 도달할 수 있다. 이와같은 조건으로 형성된 박막층에 관한 SEM image를 통해 다른 비진공 코팅 방식과 비교하였다.

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Study on the Fine Particle Charging Characteristics with the Electrohydrodynamic Atomization (전기 수력학적 방법을 이용한 미세 입자의 하전 특성에 관한연구)

  • 안진홍;김광영;윤진욱;안강호
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.13 no.4
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    • pp.289-294
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    • 2001
  • A well defined electro-spraying and electro-static precipitator(ESP) experiment is carried out to investigate the charging characteristics of the submicron particles and the monodisperse particles. The basic idea is that the highly charged electro-sprayed droplets will be produced into the gas when the Coulombic repulsive force on the surface is higher than the surface tension of the spraying liquid. During this process many highly charged smaller droplets or ions, if the droplets are completely dried out, will be produced in the space. These charged species will be attached ion the particles and then eventually charge the particles. These charged particles will be easily collected with ESP. The experimental results show that the atomizer generated particles with geometric mean diameter (GMD) of 62nm are charged more than 90% even at the mean face velocity of 2.5m/s at the charging zone.

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Characteristics of ultrafine $SiO_2$ particle synthesized by Electro-hydyodynamic spray (전기-수력학적 분사에 의해 합성된 초미세 $SiO_2$ 입자의 특성)

  • Yoon, J.U.;Yang, T.H.;Ahn, K.H.;Choi, M.S.
    • Proceedings of the KSME Conference
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    • 2000.11b
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    • pp.174-179
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    • 2000
  • Ultrafine particles have been used widely in many high technology industrial areas. The spherical nonagglomerated and uniform nanometer-size $SiO_2$ particles are synthesized by the direct injection of TEOS(Tetraethyorthosilicate) using electro-hydrodynamic spray ins method. Electro-hydrodynamic spray can generate in the range of submicron-size TEOS particles with high electric charge by applying a high electric field between the liquid injection nozzle and the reaction tube. This TEOS particles are thermally decomposed or oxidized to produce nanometresized $SiO_2$ particles in the reaction tube. Spherical, nonagglomerated and ultrafine particle generated and examined at furnaced temperature, $800^{\circ}C$ and TEOS flowrate of 0.49 or $1.00cm^3/hr$ using SEM and SMPS. As the total gas flowrate changes from 1.51pm to 5.01pm, the mean diameter of $SiO_2$ particle decreases from 120 nm to 68nm.

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Characteristics of Ultrafine SiO$_2$Particle Synthesized by Electro-Hydrodynamic Spray Injection in a Furnace (반응로내 전기-수력학적 분사에 의한 비응집 초미세 SiO$_2$ 입자 합성과 특성)

  • Yun, Jin-Uk;Yang, Tae-Hun;An, Gang-Ho;Choe, Man-Su
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.25 no.5
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    • pp.660-665
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    • 2001
  • Ultrafine particles have been widely used in many high technology industrial areas. The spherical nonagglomerated and uniform nanometer-size SiO$_2$particles are synthesized by the direct injection of TEOS(Tetraethyorthosilicate) using electro-hydrodynamic spraying method. Electro-hydrodynamic spraying can generate submicron-size TEOS droplets having high electric charges by applying a high electric field between the liquid injection nozzle and the reaction tube. These TEOS droplets are evaporated, and thermally decomposed or oxidized to produce nanometresized SiO$_2$particles in the reaction tube. Spherical, nonagglomerated and ultrafine particles are generated in various conditions and examined by using SEM and SMPS. As the total gas flow rate in the furnace changes from 1.5 lpm, the mean diameter of SiO$_2$particle decreases from 120 nm to 68 nm. The synthesized particle charging fractions are also investigated.