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경량 고강도 Mg-Zn계합금의 조직과 내식성에 관한 연구
안효준,남태현,임수근,안인섭,허보영,김기원 慶尙大學校 1995 論文集 Vol.34 No.1
The purpose in this study is to develope of high strength and corrosion reistant Mg-Zn system alloys by controlling microstructures and by adding of Cu elements. To produce optimum tesile strength,it is imperative to obtain effective grain refinment during casting. Optimal condition for grain size refining effect was obtained at the minmum composotion of 2wt% Cu or 1.5wt%So addition to Mg-6wt%Zn alloy.Age hardening behavior was experimented at the optimal compositions of the Mg-6wt%Zn, Mg-6wt%Zn-2wt%Cu and Mg-6wt%Zn-1.5wt%Si. The hardeness increment due to age hardening was at the Mg-Zn-Si alloy system. The improvement of corrosion resistanece by the addition with Cu is related to and increasing Zn/Cu ration in the intermatallic particles in the Mg-Zn system.Further improvements obtained by T6 treatment are related to the properties of the Mg-Zn phase,whih acts as a corrosion barrier by precipitating along the grainboundaries.Filiform corrosion observed soon after pit initiation and cellular form of pit propagation later in chloride media are explained in terms of solid solution matrix structure and the properties of air formed oxide.The information obtained from the fundamental research work is utilized in suggesting ways of improving the corrosion resistance of commercial AZ91.
Tuning fork형 micro-cantilever sensor
김충현,안효석 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-
An experimental investigation of the basic characteristics of a micro-cantilever sensor was performed by inspecting the amplitude and frequency characteristics using a commercial tuning fork. Application of acetone and ethanol with a volume of 1μl on the tine of a vibrating tuning fork cause immediate response in its amplitude and frequency. It has shown that the tuning fork has ability to recognize a chemical agent with high sensitivity.
Fabrication of large Pt nanoparticles-decorated rGO counter electrode for highly efficient DSSCs
Ahn, Hyo-Jin,Lee, Jung-Soo,Kim, Hyo-Sub,Hwang, In-Tae,Hong, Ji-Hyun,Shin, Junhwa,Jung, Chan-Hee Elsevier 2018 Journal of industrial and engineering chemistry Vol.65 No.-
<P><B>Abstract</B></P> <P>This study describes the radiolytic fabrication of large Pt nanoparticles (NPs)-decorated reduced graphene oxide (L-Pt/rGO) and its use as a counter electrode (CE) in dye-sensitized solar cells (DSSCs). A homogenous aqueous solution of GO in 10wt% isopropyl alcohol (IPA) aqueous solution containing Pt precursor was irradiated with γ-ray at room temperature to prepare the L-Pt/rGO. The analytic results from TEM, EDX, XPS, and Raman revealed that the rGO decorated with 100nm Pt NPs was successfully formed by the γ-ray irradiation-induced reduction of both the GO and Pt precursor in aqueous IPA solution. Based on the results of the DSSCs performance test, the energy conversion efficiency of the DSSCs with the L-Pt/rGO-based CE outperformed that with the rGO-based one due to the lower sheet resistance, and even was comparable to that of the Pt-based CE. This L-Pt/rGO fabricated by a simple, room temperature and scalable radiolytic method can be used as a promising CE material for low-cost and high-performance DSSCs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Large Pt nanoparticles-decorated rGO sheet (L-Pt/rGO) was prepared by radiation γ-ray irradiation. </LI> <LI> L-Pt/rGO shows low sheet resistnace due to the reduced inter-sheet resistance. </LI> <LI> L-Pt/rGO with low Pt content exhibited the performance compable to that of Pt- counter electrode. </LI> <LI> Incoporation of small Pt nanoparticles on L-Pt/rGO can further increase the device-efficiency of DSSC. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>