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Characteristics of Hot-Dip Znmgal Coatings with Ultra-High Corrosion Resistance
( Sungjoo Kim ),( Seulgi So ),( Jongwon Park ),( Taechul Kim ),( Sangtae Han ),( Suwon Park ),( Heung-yun Kim ),( Myungsoo Kim ),( Doojin Paik ) 한국부식방식학회 2024 Corrosion Science and Technology Vol.23 No.4
Zn-Mg-Al alloy hot-dip galvanized steel sheet has high corrosion resistance. Compared to conventional Zn coating with the same coating thickness, the high corrosion resistance Zn-Mg-Al coating is more corrosionresistant. Various coating compositions are commercially produced and applied in diverse fields. However, these steel sheets typically contain up to 3 wt% magnesium. In recent years, there has been a growing demand for higher corrosion resistance in harsh corrosive environments. Therefore, variations in Mg and Al contents were investigated while evaluating primary properties and performance. As a result, we developed new alloycoated steel with ultra-high corrosion resistance. A Zn-5 wt%Mg-Al coated steel sheet was evaluated for its corrosion resistance and various properties. As the amount of Mg added increased, the corrosion loss tended to decrease. The corrosion resistance of the coated steel sheet in a particular composition, the Zn-5 wt%Mg- Al coating sheet, was about 1.5 to 2 times higher than that of the conventional Zn-3 wt%Mg-Al coating sheet. Ultimately, this ultra-high corrosion-resistance coated steel sheet will provide a robust solution to conserve Zn resources and contribute to a low-carbon society.
Slot die coated planar perovskite solar cells via blowing and heating assisted one step deposition
Kim, Jueng-Eun,Jung, Yen-Sook,Heo, Youn-Jung,Hwang, Kyeongil,Qin, Tianshi,Kim, Dong-Yu,Vak, Doojin North-Holland 2018 Solar Energy Materials and Solar Cells Vol. No.
<P><B>Abstract</B></P> <P>CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB>-based planar perovskite solar cells were fabricated by slot-die coating, a scalable method. Slot-die coating tends to produce perovskite layers with much lower coverage with overgrown crystals than spin coating, which does not include a self-drying mechanism in the process. To mimic the self-drying behavior inherent in spin coating, the present study introduces a blowing step in the slot-die coating method, which significantly improved coverage of the prepared slot-die coated perovskite films. The slot-die-coated device with blowing showed a moderate power conversion efficiency (PCE) of 8.8%. The morphology of the slot-die-coated perovskite film is further improved by optimizing the deposition temperature. The combination of blowing and heating during the slot-die-coating step and the introduction of a printing-friendly hole transport layer resulted in a PCE of 12.7% for the devices fabricated in air.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Scalable and roll-to-roll compatible deposition process is developed to produce planar perovskite solarcells. </LI> <LI> The highest efficiency from single-step slot die coated perovskite solar cells is achieved. </LI> <LI> Synergy effect of gas blowing and heating on morphology of slot die coated films is found. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kim, Doojin,Mun, Sora,Lee, Jiyeong,Park, Arum,Seok, AeEun,Chun, Yeon-Tae,Kang, Hee-Gyoo Elsevier 2018 INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES Vol.109 No.-
<P><B>Abstract</B></P> <P>Rheumatoid factor (RF) is an auto-antibody against antigen–antibody immune complexes. RF is valuable as a biomarker for the screening of autoimmune and infectious diseases. However, it is suggested that RF would be a more powerful biomarker when used complementarily with RF-correlated proteins. In this study, we utilized a proteomic approach to analyze global protein expression in RF-low and RF-high subjects using high-performance liquid chromatography tandem mass spectrometry. Histidine-rich glycoprotein (HRG) and lipopolysaccharide-binding protein (LBP) were found to be differentially expressed between RF-low and RF-high subjects (cut-off > 2-fold, <I>p <</I> 0.05), which was validated by enzyme-linked immunosorbent assay. To evaluate whether both proteins allow discriminating rheumatoid arthritis patients from healthy controls, receiver-operating characteristic (ROC) curves were analyzed. Areas under the ROC curves of HRG and LBP were 0.861 and 0.888, respectively. The correlation between RF and HRG was statistically significant (<I>p</I> = 0.003), and LBP was also correlated with RF (<I>p</I> = 0.044), as indicated by correlation analysis. HRG and LBP are reportedly involved in RF-producing and RF-correlated diseases. Thus, we propose that HRG and LBP could be useful screening markers for RF-correlated diseases.</P>