http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
윤은섭,박홍준,길민식,김주은,이경균,최봉길 대한화학회 2023 Bulletin of the Korean Chemical Society Vol.44 No.6
A highly sensitive potentiometric pH sensor was developed based on nanopil-lar array electrodes of iridium oxide. The as-prepared pH sensor exhibited ahigh pH sensitivity (69.43 mV/pH), fast response time (8.1 s), and good durabil-ity (0.76 mV/h). The sensing performance of the pH sensor was maintainedunder mechanical bending and even after 1000 repetitive bending/releasingcycles. As a proof-of-concept, a wearable headband sensor was fabricated byintegrating the pH sensor with a wireless electronic module based on a printedcircuit board. The on-body test indicated that the wearable pH sensor providesreliable and stable data in the real-time monitoring of pH changes in humansweat during stationary indoor cycling. The pH sensors based on nanopillararray electrodes of iridium oxide have great potential in many portable orwearable applications in healthcare systems, non-invasive diagnostics, environ-mental analysis, and food sensors.
윤은섭,신혜영,박영섭 한국기계기술학회 2007 한국기계기술학회지 Vol.9 No.3
CASS(Cast Austenitic Stainless Steel) materials are used in pressure-boundary components, such as piping and pump casing in power plant. When CASS components are exposed to high temperature (i.e. over 280oC) for a long time, thermal embrittlement could occur. Thermal embrittlement susceptibility of pipings and pump casings are determined by calculate the ferrite contents and fracture toughness. For some piping components, ferrite contents exceed the criterion value, are potentially susceptible to thermal embrittlement. But fracture toughness value is high enough to satisfy susceptibility criterion for all CASS components. Also flaw tolerance evaluation is assessed to piping and pump casing. As a result, there were no significant thermal embrittlement risk on CASS components.
고에너지 전자빔투사방법에 의한 Cr₃C₂/SUS316L 표면복합재료의 제조와 미세조직분석
윤은섭,이성학 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.8
The present study is concerned with fabrication and microstructural analysis of Cr₃C₂/SUS316L surface composites using high-energy electron-beam irradiation. Three kinds of powder mixtures, i.e., 50Cr₃C₂-50CaF₂(flux), 100Cr₃C₂, and 87.5Cr-12.5C (wt.%), were placed on an SUS₃16L stainless steel substrate, which was then irradiated with electron beam. In the specimens fabricated without flux powders, the surface composite layer of 3.5-4.8 mm in thickness was successfully formed without defects by the self-fluxing effect, and contained a large amount (up to 18 vol.%) of Cr_(7)C₃ carbides in the austenite matrix. The composite layer fabricated with Cr and C powders having lower melting points than Cr₃C₂ powders was thicker than that fabricated with Cr₃C₂ powders because of more effective melting of powders during electron-beam irradiation. The hardness and wear resistance of the surface composite layer were directly influenced by hard primary Cr_(7)C₃ carbides, and thus were about two times greater than those of the untreated stainless steel substrate.
우수한 전기화학적 센싱 성능을 지닌 티타늄 와이어 기반의 휴대 및 일회용 pH 센서 개발
윤은섭 ( Eun Seop Yoon ),윤조희 ( Jo Hee Yoon ),손선규 ( Seon Gyu Son ),김서진 ( Seo Jin Kim ),최봉길 ( Bong Gill Choi ) 한국공업화학회 2021 공업화학 Vol.32 No.6
본 연구에서는 하이드로늄 이온 농도를 모니터링하기 위한 티타늄(Ti) 와이어를 기반으로 하는 휴대용 일회용 pH 센서를 성공적으로 개발하였다. 센싱 전극은 Ti 와이어에 이리듐 산화물을 전기화학적으로 증착하여 제조하였고, 기준전극으로 Ti 와이어에 Ag/AgCl 잉크를 코팅하였다. pH 센서에 두 개의 전극을 결합한 후 pH 센서를 다양한 pH 용액에 담그면 개방 회로 전위 신호를 수집할 수 있다. 상기 제조된 pH 센서는 감도, 응답 시간, 반복성, 선택도 및 안정성 측면에서 우수한 전기화학적 감지 성능을 보여 주었다. 현장 검사 응용을 시연하기 위해서 pH 센서를 모바일 애플리케이션과 통신할 수 있는 무선 전자 모듈과 통합하였다. 이 휴대용 pH 센서는 실제 샘플의 pH 변화를 정확하게 측정했으며 결과는 상용 pH 측정기의 데이터와 일치하였다. A portable and disposable pH sensor based on Ti wire was successfully developed for monitoring hydronium ion concentrations. A sensing electrode was prepared by electrochemically depositing iridium oxide onto a Ti wire, while a reference electrode was fabricated by coating Ag/AgCl ink on a Ti wire. Combining the two electrodes in the pH sensor enabled the collection of open circuit potential signals when the sensor was immersed in solutions of various pH values. The pH sensor exhibited excellent electrochemical sensing performance in terms of sensitivity, response time, repeatability, selectivity, and stability. To demonstrate point-of-measurement applications, the pH sensor was integrated with a wireless electronic module that could communicate with a mobile application. The portable pH sensor accurately measured pH changes in real samples. The results obtained were consistent with those of using a commercial pH meter.