• Title/Summary/Keyword: 흡광

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Study on the Determination of Benzene Hexachloride in Contaminated Air (공기중에 오염되어 있는 BHC의 정량에 관한 연구)

  • Ki Won Cha;Byung Du Chang
    • Journal of the Korean Chemical Society
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    • v.22 no.4
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    • pp.254-258
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    • 1978

  • A simple and sensitive method of determining trace amounts of benzene hexachloride (BHC) in air has been investigated. The sample is passed through the n-hexane solution and the absorbance of it was measured at 245nm spectrophotometrically and the concentration of benzene hexachloride was calculated using a working curve obtained from the vaporized standard benzene hexachloride passed into n-hexane.

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Determination of Pipethanate$\cdot$HCl by Spectrophotometry and Atomic Absorption Spectrophotometry (흡광광도법 및 원자흡광광도법에 의한 Pipethanate$\cdot$HCl의 정량)

  • 이왕규;박만기;김박광;손채연
    • YAKHAK HOEJI
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    • v.27 no.4
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    • pp.303-307
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    • 1983

  • Pipethanate*HCl reacts with ammonium cobaltothiocyanate to form a stable ion pair which has an absorption maximum at 626nm. The reaction product was insoluble in water but freely soluble in most organic solvents. 1, 2-Dichloroethane was the best extracting solvent among the several organic solvents. Pipethanate*HCl can be determined not only by the spectrophotometry but also inderectly by estimation of cobalt in the organic phase by atomic absorption spectrophotometry. Linear relationship was found between absorbance and concentration in the range of $1.0{\times}10^{-3}~4.0{\times}10^{-3}M$ by spectrophotometry and $1.5{\times}10^{-4}~4.0{\times}10^{-4}M$ by atomic absorption spectrophotometry. With this method it was possible to determine pipethanate$\cdot$HCl in the pharmaceutical preparations.

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An Immersion-Type Photometric Probe for Photometric Titration (침액형 광도검지기를 사용한 흡광광도 적정에 관한 연구)

  • Q Won Choi;Chuhyun Choe
    • Journal of the Korean Chemical Society
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    • v.18 no.1
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    • pp.47-49
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    • 1974

  • A photometric probe that can be immersed in liquid has been prepared by sealing a phototransistor with a collimating lens in a glass tubing water tight. Due to the directional sensing property of the probe, it has been successfully used in photometric titrations. Thus, when the probe is immersed in the titrand solution vertically and a light source is placed underneath the beaker containing the titrand, the relative absorbance of the solution can be measured without shielding from the room light.

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Recent Research Trend in Nonfullerene Electron Acceptors for Organic Solar Cells (비풀러렌 소재 기반 유기태양전지 연구 동향 및 전망)

  • Lee, Jaewon
    • Prospectives of Industrial Chemistry
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    • v.24 no.5
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    • pp.15-29
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    • 2021

  • 최근 유기태양전지 분야의 큰 진보는 비풀러렌 전자수용체 소재의 등장에 의해 달성되었다. 비풀러렌 기반 유기광활성층은 기존 풀러렌 기반 소자의 내재적 한계로 지적되던 높은 에너지 손실을 극복하고 동시에 소재의 흡광대역 확장을 통한 광전류밀도 증가로 유기태양전지 성능을 지속적으로 개선하고 있다. 더불어 비풀러렌 소재는 화학 구조의 개질 용이성으로 밴드갭 자유 제어가 가능하므로, 광활성층의 흡광 대역을 정밀하게 제어하면 반투명 태양전지, 실내 저조도 태양전지, 파장선택적 광검출기, 소재융합형 소자 등 다양한 광전자소자 응용이 가능하여 주목받고 있다. 본 기고문에서는 유기태양전지 광활성층에 활용되는 비풀러렌 소재의 최신 연구 동향과 전망을 다루고자 한다.