• Title/Summary/Keyword: 화학공학

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Electroluminescence Properties of Novel Blue-Emitting Materials Based on Spirobifluorene (Spirobifluorene 그룹을 포함하는 새로운 청색 발광 재료의 전계발광)

  • Sunwoo, Park;Hayoon, Lee;Hyukmin, Kwon;Godi, Mahendra;Sangshin, Park;Seungeun, Lee;Jongwook, Park
    • Applied Chemistry for Engineering
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    • v.34 no.1
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    • pp.94-97
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    • 2023
  • 2,7-bis(3',6'-diphenyl-[1,1':2',1"-terphenyl]-4'-yl)-9,9'-spirobi[fluorene] (BTPSF) and 2,7-bis(1,4-diphenyltriphenylen-2-yl)-9,9'-spirobi[fluorene] (BDTSF) were successfully synthesized as novel blue-emission materials for organic light-emitting diodes (OLEDs) based on the spirobifluorene (SBF) moiety. BTPSF and BDTSF were obtained in high purity via a Diels-Alder reaction, without the use of a catalyst. Photoluminescence spectra of the synthesized materials showed maximum emitting wave-lengths of approximately 381 and 407 nm in solution and 395 and 434 nm in the film state, for BTPSF and BDTSF, respectively, indicating ultra-violet and deep blue emission colors. BDTSF was applied as an emissive layer (EML) in non-doped devices and achieved a current efficiency of 0.61 cd/A and an external quantum efficiency (EQE) of 0.46%.

Nanobio Colloidal Materials for Dermatological Applications (피부과학 나노바이오 콜로이드 개발 동향)

  • Kim, Ji Eun;Park, Daehwan;Lee, Jin Yong;Seo, Hyemin;Choi, Sang Koo;Kim, Jin Woong
    • Prospectives of Industrial Chemistry
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    • v.20 no.6
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    • pp.2-12
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    • 2017
  • 최근 피부산업은 미용적인 관점뿐만 아니라 피부질환치료에 대한 관심까지 폭넓게 성장하고 있어 피부의 건강을 개선하고 치료할 수 있는 새로운 신기술 개발이 다각적으로 이루어지고 있다. 특히 기술의 고도화와 체계화를 통한 피부과학기술의 진보가 화학, 화학공학, 재료공학을 기반으로 하는 전통학문분야와 조직공학, 바이오나노공학, 감성공학 등을 기반으로 하는 신학문분야가 융복합되어 이루어지고 있다. 따라서, 본 고에서는 피부산업에서 전략적인 응용이 가능한 피부 나노바이오 콜로이드의 연구개발에 대한 최근 현황을 소개하고자 한다.

학회순례 - 62년 창립 회원 4천3백여명 '한국화학공학회'

  • Han, Hyeong-Su
    • The Science & Technology
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    • v.32 no.8 s.363
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    • pp.86-89
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    • 1999
  • 화학공학은 화학관련 제품의 생산공정을 설계하고 건설할 뿐 아니라 공장을 운전하는 기술들을 체계화하는 학문으로 백화점이나 가게에 진열된 상품들은 대부분 화학공학 기술로 만들어진 것이다. 한국화학공학회는 이러한 화학공학을 교육하고 연구하거나 생산에 종사하는 사람들이 모여 1962년 창립한 학술단체로 현재 4천3백여명의 회원이 규합하여 왕성한 학술활동을 하고 있다.

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Effect of chemical vapor depositon capacity on the physical characteristics of carbon-coated SiOx (화학기상증착 코팅로의 용량에 따른 탄소 코팅 SiOx의 물리적 특성 변화 분석)

  • Maeng, Seokju;Kwak, Woojin;Park, Heonsoo;Kim, Yong-Tae;Choi, Jinsub
    • Journal of the Korean institute of surface engineering
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    • v.55 no.6
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    • pp.441-447
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    • 2022
  • Silicon-based materials are one of the most promising anode active materials in lithium-ion battery. A carbon layer decorated on the surface of silicon particles efficiently suppresses the large volume expansion of silicon and improves electrical conductivity. Carbon coating through chemical vapor deposition (CVD) is one of the most effective strategies to synthesize carbon- coated silicon materials suitable for mass production. Herein, we synthesized carbon coated SiOx via pilot scale CVD reactor (P-SiOx@C) and carbon coated SiOx via industrial scale CVD reactor (I-SiOx@C) to identify physical characteristic changes according to the CVD capacity. Reduced size silicon domains and local non-uniform carbon coating layer were detected in I-SiOx@C due to non-uniform temperature distribution in the industrial scale CVD reactor with large capacity, resulting in increased surface area due to severe electrolyte consumption.

Nanostructured PVdF-HFP/TiO2 Composite as Protective Layer on Lithium Metal Battery Anode with Enhanced Electrochemical Performance (PVdF-HFP/TiO2 나노복합체 보호층을 통한 리튬금속전지 음극의 전기화학적 성능 향상)

  • Lee, Sanghyun;Choi, Sang-Seok;Kim, Dong-Eun;Hyun, Jun-Heock;Park, Young-Wook;Yu, Jin-Seong;Jeon, So-Yoon;Park, Joongwon;Shin, Weon Ho;Sohn, Hiesang
    • Membrane Journal
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    • v.31 no.6
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    • pp.417-425
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    • 2021
  • As the demand for high-capacity batteries increases, there has been growing researches on the lithium metal anode with a capacity (3,860 mAh/g) of higher than that of conventional one and a low electrochemical potential (-3.040 V). In this study, using the anatase phased TiO2 nanoparticles synthesized by hydrothermal synthesis, a PVdF-HFP/TiO2 organic/inorganic composite material was designed and used as an interfacial protective layer for a Li metal anode. As-formed organic/inorganic-lithium composite thin film was confirmed through the crystalline structure and morphological analyses. In addition, the electrochemical test (cycle stability and voltage profile) confirmed that the protective layer of PVdF-HFP/TiO2 composite (10 wt% TiO2 and 1.1 ㎛ film thickness) contributed to the enhanced electrochemical performance of the lithium metal anode (Colombic efficiency retention: 90% for 77 cycles). Based on comparative test with the untreated lithium electrode, it was confirmed that our protective layer plays an important role to stabilize/improve the EC performance of the lithium metal negative electrode.