• 제목/요약/키워드: Semi-organic material

검색결과 31건 처리시간 0.034초

자동차 제동시 나타나는 마찰재의 마찰 특성에 관한 연구 (II. 비석면계 유기질 (Non-asbestos Organic) 마찰재와 반금속 (Semi-metallic) 마찰재의 마찰 특성 비교) (Study of Friction Charactedstics of Non-asbestos Organic (NAO) and Semi-metallic Brake Pads During Automotive Braking)

  • 김성진;장호
    • Tribology and Lubricants
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    • 제13권3호
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    • pp.10-19
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    • 1997
  • Frictional characteristics of two different types of automotive friction materials were studied. They were non-asbestos organic and semi-metallic friction materials. The two friction materials were tested using an inertial brake dynamometer to investigate friction stability, rooster tailing phenomena, temperature change during drags and stops. Results show that the level of the friction force is strong functions of time, temperature, and speed regardless of the type of friction materials. In particular, rooster tailing effects are pronounced in the case of semi-metallic friction materials compared to non-asbestos organic friction materials. The phenomena appear strongly dependent on raw materials contained in the friction materials.

바닥재에서 발생하는 준휘발성유기화합물 측정 및 챔버 내 기류 특성 평가 (Measurement of Semi-Volatile Organic Compounds from Flooring Material and Evaluation on Airflow Characteristics in a Test Chamber)

  • 서장후;;임만택
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2009년도 하계학술발표대회 논문집
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    • pp.762-767
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    • 2009
  • Some types of semi-Volatile organic compounds (SVOC) that are emitted from plastics used in building materials and household appliances have associated health risks, even at low concentrations. In this study, micro chamber method for measuring SVOC is introduced and SVOC such as di (2-ethylhexyl) phthalate and butylated hydroxyltoluene emitted a flooring material were measured using a micro chamber method. Airflow characteristics in a micro test chamber deeply depended on air exchange rate. From the evaluation using an index of air change efficiency, such as the air age and the coefficient of air change performance, a fixed air exchange rate of $1.5\;h^{-1}$ in the micro chamber is desirable.

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재활용 석고 부산물을 이용한 준불연 유무기 융합 단열재 개발 연구 (Development of Organic-Inorganic Hybrid Insulating Materials with Semi-Non-Combustible Using by Recycling Gypsum)

  • 하주연;신현규;송태협
    • 한국건설순환자원학회논문집
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    • 제7권4호
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    • pp.431-437
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    • 2019
  • 본 연구는 유기계 기재에 무기계 바인더 소재를 함침시킴으로써 유기계 수준의 경제성을 가지며 우수한 단열성능 및 화재 안전성을 보유한 유무기 융합형 단열재 개발을 목적으로 한다. 유기계 기재는 폴리우레탄 소재의 상용 스펀지를 사용하였고, 함침용 무기 바인더 용액은 재활용 석고 부산물에 물과 첨가제를 혼합하여 제조하였다. 개발 소재의 성능평가 결과 열전도율 0.051W/mK 이하의 우수한 단열성능 뿐만 아니라 국토교통부 고시 제 2015-744호 기준에 명시된 준불연 재료임을 확인할 수 있었다. 또한 본 개발 소재는 제조 공정 과정에서 밀도 제어에 따른 열전도율 및 난연성 조절이 가능하여 다양한 용도의 단열재에 적용 가능할 것으로 판단된다.

구리 CMP 적용을 위한 산성 콜로이드 실리카를 포함한 준무연마제 슬러리 연구 (A Study on Semi Abrasive Free Slurry including Acid Colloidal Silica for Copper Chemical Mechanical Planarization)

  • 김남훈;김상용;서용진;김태형;장의구
    • 한국전기전자재료학회논문지
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    • 제17권3호
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    • pp.272-277
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    • 2004
  • The primary aim of this study is to investigate new semi-abrasive free slurry including acid colloidal silica and hydrogen peroxide for copper chemical-mechanical planarization (CMP). In general, slurry for copper CMP consists of colloidal silica as an abrasive, organic acid as a complex-forming agent, hydrogen peroxide as an oxidizing agent, a film forming agent, a pH control agent and several additives. We developed new semi-abrasive free slurry (SAFS) including below 0.5% acid colloidal silica. We evaluated additives as stabilizers for hydrogen peroxide as well as accelerators in tantalum nitride CMP process. We also estimated dispersion stability and Zeta potential of the acid colloidal silica with additives. The extent of enhancement in tantalum nitride CMP was verified through anelectrochemical test. This approach may be useful for the application of single and first step copper CMP slurry with one package system.

유기발광 다이오드의 정공수송층 두께에 따른 미소 공진 효과의 영향에 관한 연구 (A Study on the Effects of Micro Cavity on the HTL Thicknesses on the Top Emission Organic Light Emitting Diode)

  • 이동운;조의식;성진욱;권상직
    • 반도체디스플레이기술학회지
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    • 제21권1호
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    • pp.91-94
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    • 2022
  • Top emission organic light-emitting diode is commonly used because of high efficiency and good color purity than bottom - emission organic light-emitting device. Unlike BEOLED, TEOLED contain semi-transparent metal cathode. Because of semi-transparent cathode, micro cavity effect occurs in TEOLED. We optimized this effect by changing the thickness of hole injection layer. Device consists of is indium-tin-oxide / N,N'-Di-[(1-naphthyl)-N,N'-diphenyl]-1,1'-biphenyl-4,4'-diamine (x nm) / tris-(8-hydroxyquinoline) aluminum (50nm) / LiF(0.5nm) / Mg:Ag (1:9), and we changed NPB thickness which is used as HTL in our device in order to study how micro cavity effects are changed by optical path. As the results, NPB thickness at 35nm showed the current efficiency of 8.55Cd/A.

준 무연마제 슬러리를 아용한 Cu CMP 연구 (Study on Cu CMP by using Semi-Abrasive Free Slurry)

  • 김남훈;임종흔;엄준철;김상용;김창일;장의구
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2003년도 춘계학술대회 논문집 센서 박막재료 반도체 세라믹
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    • pp.158-161
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    • 2003
  • The primary aim of this study is to investigate new semi-abrasive free slurry including acid colloidal silica and hydrogen peroxide for copper chemical-mechanical planarization (CMP). In general, slurry for copper CMP consists of colloidal silica as an abrasive, organic acid as a complex-forming agent, hydrogen peroxide as an oxidizing agent, a film forming agent, a pH control agent and several additives. We developed new semi-abrasive free slurry (SAFS) including below 0.5% acid colloidal silica. We evaluated additives as stabilizers for hydrogen peroxide as well as accelerators in tantalum nitride CMP process. We also estimated dispersion stability and Zeta potential of the acid colloidal silica with additives. The extent of enhancement in tantalum nitride CMP was verified through anelectrochemical test. This approach may be useful for the application of single and first step copper CMP slurry with one package system.

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Separation and recovery of semi-volatile substances of Cnidii Rhizoma, Aucklandiae Radix and Amomum Fructus by reduced pressure collections and GC-MS

  • Lee, In-Ho;Byun, Chang Kyu;Eum, Chul Hun;Kim, Taewook;Lee, Sam-Keun
    • 분석과학
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    • 제33권1호
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    • pp.11-22
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    • 2020
  • When extracting semi-volatile components of herbal medicines using hot water vapor, some substances may react with water vapor or oxygen, and some volatile substances may be lost, when using an organic solvent extraction method has the disadvantage that it may contain a non-volatile material and residual organic solvent. In addition, it is inefficient to separate semi-volatile substances from herbal medicines into each single component and conduct biological activity research for each component to determine the effective ingredient, and some components may be lost in the separation process. In this study, semi-volatile substances evaporated under two pressure-reduced conditions in Chinese herbal medicines such as Cnidii Rhizoma, Aucklandiae Radix and Amomum Fructus were separated by cooling with liquid nitrogen. Those were analyzed by gas chromatography-mass spectrometry (GC-MS) to identify the components, and this method may be used to study biological activities at the cellular level. The substances separated under reduced pressure, essential oil obtained by simultaneous distillation extraction (SDE) method and substances by using solid phase micro-extraction (SPME) from Cnidii Rhizoma, Aucklandiae Radix and Amomum Fructus were analyzed by GC-MS. In the case of Cnidii Rhizoma and Aucklandiae Radix, there were some differences among the essential oil components obtained by SDE and those identified by low temperature capture (CT) and SPME method, these were believed to be produced by some volatiles reacting with water or oxygen at the boiling point temperature of water.

고효율 적층형 태양전지를 위한 유무기 페로브스카이트 (Organic-Inorganic Perovskite for Highly Efficient Tandem Solar Cells)

  • 박익재;김동회
    • 세라미스트
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    • 제22권2호
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    • pp.146-169
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    • 2019
  • To overcome the theoretical efficiency of single-junction solar cells (> 30 %), tandem solar cells (or multi-junction solar cells) is considered as a strong nominee because of their excellent light utilization. Organic-inorganic halide perovskite has been regarded as a promising candidate material for next-generation tandem solar cell due to not only their excellent optoelectronic properties but also their bandgap-tune-ability and low-temperature process-possibility. As a result, they have been adopted either as a wide-bandgap top cell combined with narrow-bandgap silicon or CuInxGa(1-x)Se2 bottom cells or for all-perovskite tandem solar cells using narrow- and wide-bandgap perovskites. To successfully transition perovskite materials from for single junction to tandem, substantial efforts need to focus on fabricating the high quality wide- and narrow-bandgap perovskite materials and semi-transparent electrode/recombination layer. In this paper, we present an overview of the current research and our outlook regarding perovskite-based tandem solar technology. Several key challenges discussed are: 1) a wide-bandgap perovskite for top-cell in multi-junction tandem solar cells; 2) a narrow-bandgap perovskite for bottom-cell in all-perovskite tandem solar cells, and 3) suitable semi-transparent conducting layer for efficient electrode or recombination layer in tandem solar cells.

자동차에 사용되는 금속성 마찰재와 유기질 마찰재의 마찰 특성에 관한 연구

  • 장호
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 1997년도 제25회 춘계학술대회
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    • pp.47-52
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    • 1997
  • Friction properties of two different types of automotive friction materials were studied. They were nonasbestos organic and semi-metallic friction materials. The two friction materials were tested using an inertia brake dynamometer to investigate friction stability, rooster tailing phenomena, temperature change of riction couples during drags and stops. Results showed that the level of the friction force is strong function of time, temperature, and speed regardless of the type of friction materials. The change of triction coefficient during braking (rooster tailing) was pronounced when the applied pressure was increased in the case of semi-metallic friction materials. This phenomena appears strongly dependent on the applied pressure, initial brake temperature and ingredients in the friction material.

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광학적 간섭효과에 따른 OLED의 발광효율 개선 (Luminacne Efficiency Improvement of OLED through Optical Interference Effect)

  • 임재성;이붕주;신백균;김소정;정무영;이은학;김동화;진경시
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2008년도 제39회 하계학술대회
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    • pp.1275-1276
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    • 2008
  • In this study, a micro-cavity organic light-emittingdevice (OLED) with semi-transparent-Ag/AgO hole injecting layer (HIL) was fabricated and their performance was investigated. For the fabrication of OLEDs N,N-diphenyl-N,N-(3-methyphenyl)-1,1-biphenyl-4-4-diamine (TPD), known as a hole transporting material and tris (8-hydroxyquinolinato)-aluminum ($Alq_3$) as both electron-transporting layer (ETL) and emission layer (EML) were deposited using thermal evaporation technique. And Al layer as cathode was then deposited using thermal evaporation technique. Effects of the semi-transparent-Ag/AgO layers on the resulting OLED performance were investigated.

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