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Jung, Chanwon,Lee, Changsoo,Bang, Kihoon,Lim, JeongHoon,Lee, Hoin,Ryu, Ho Jin,Cho, EunAe,Lee, Hyuck Mo American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.37
<P>Recently, Pt3M (M = Fe, Ni, Co, Cu, etc.) intermetallic compounds have been highlighted as promising candidates for oxygen reduction reaction (ORR) catalysts. In general, to form those intermetallic compounds, alloy phase nanoparticles are synthesized and then heat-treated at a high temperature. However, nanoparticles easily agglomerate during the heat treatment, resulting in a decrease in electrochemical surface area (ECSA). In this study, we synthesized Pt-Fe alloy nano particles and employed carbon coating to protect the nanoparticles from agglomeration during heat treatment. As a result, Pt3Fe L1(2) structure was obtained without agglomeration of the nanoparticles; the ECSA of Pt-Fe alloy and intermetallic Pt3Fe/C was 37.6 and 33.3 m(2) g(pt)(-1), respectively. Pt3Fe/C exhibited excellent mass activity (0.454 A mg(pt)(-1)) and stability with superior resistances to nanoparticle agglomeration and iron leaching. Density functional theory (DFT) calculation revealed that, owing to the higher dissolution potential of Fe atoms on the Pt3Fe surface than those on the Pt-Fe alloy, Pt3Fe/C had better stability than Pt-Fe/C. A single cell fabricated with Pt3Fe/C showed higher initial performance and superior durability, compared to that with commercial Pt/C. We suggest that Pt3M chemically ordered electrocatalysts are excellent candidates that may become the most active and durable ORR catalysts available.</P>
Pattern development of comfortable medical protective clothing
( Suyeon Kim ),( Minji Kim ),( Chanwon Jung ),( Yeongjin Kim ),( Heeran Lee ) 한국감성과학회 2021 추계학술대회 Vol.2021 No.0
A pattern of medical protective clothing with improved movement comfort was developed. As a result of subjective evaluation, the movement comfort was improved in the armpit and the neck where the most discomfort was felt.
Chung Hee Chan,Jung Young-Eun,Park Chanwon,Kim Moon-Doo,Yoon Bo-Hyun 대한우울조울병학회 2021 우울조울병 Vol.19 No.2
Background: The relationship between a low vitamin D level and depression has been demonstrated repeatedly. We assessed the correlation between vitamin D status and the prevalence of depression according to body weight status. Methods: Data from 1,747 participants who took part in the 2014 Korean National Health and Nutrition Examination Survey were analyzed. The presence of depression was identified by the brief, self-reported Patient Health Questionnaire-9 (PHQ-9), vitamin D status was defined based on the serum 25-hydroxyvitamin D [25(OH)D] level, and body weight status was expressed as the body mass index. Results: After adjusting for potential confounding factors, participants in the vitamin D deficiency group (odds ratio [OR], 2.70; 95% confidence interval [CI], 1.01-7.20) and severe deficiency group (OR, 2.89; 95% CI, 1.04-8.00) were significantly more likely to experience depression. Multivariate logistic regression analyses indicated that among the participants with overweight or obesity, those in the vitamin D deficiency group were 3.71 times more likely than those in the sufficiency group (OR, 3.71; 95% CI, 1.08-12.74) to experience depression. Conclusion: Our findings suggest a significant association between low vitamin D levels and depression in adults with overweight or obesity. Further studies are needed to elucidate the association between vitamin D status and depression according to body weight status.
Pattern development of comfortable medical protective clothing
( Suyeon Kim ),( Minji Kim ),( Chanwon Jung ),( Yeongjin Kim ),( Heeran Lee ) 한국감성과학회 2021 한국감성과학회 국제학술대회(ICES) Vol.2021 No.-
A pattern of medical protective clothing with improved movement comfort was developed. As a result of subjective evaluation, the movement comfort was improved in the armpit and the neck where the most discomfort was felt.
Lee, Changsoo,Shin, Kihyun,Lee, Yung Jong,Jung, Chanwon,Lee, Hyuck Mo Elsevier 2018 CATALYSIS TODAY - Vol.303 No.-
<P><B>Abstract</B></P> <P>Here we examine Ag-Cu<SUB>2</SUB>O core-shell nanoparticles with bumpy structures for use in plasmonic photocatalysts. We synthesized the nanoparticles using a very simple co-reduction process. The shell thickness of the nanoparticles was controlled in order to investigate the effects of shell thickness on photocatalytic activity and stability. With increasing shell thickness, it was be observed that the activity and the stability were simultaneously improved. A thin shell lead to de-wetting of Cu<SUB>2</SUB>O from the Ag core and considerable oxidation of Cu<SUB>2</SUB>O to CuO. The high activity could be due to the unique structure of Ag-Cu<SUB>2</SUB>O, which has a high surface area and plasmonic charge transfer from the Ag core. In addition, we elucidated the stability tendency using conducted density functional theory (DFT) calculation. Strain induced between the Ag core and shell is critical to the stability, leading to de-wetting and oxidation of Cu<SUB>2</SUB>O.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We synthesized Ag-Cu<SUB>2</SUB>O core-shell NPs with bumpy structure. </LI> <LI> The Ag-Cu<SUB>2</SUB>O core-shell NPs have high surface area and broad range of UV–vis absorption. </LI> <LI> Shell thickness of Ag-Cu<SUB>2</SUB>O NPs play a key role for activity and stability of the photocatalysts. </LI> <LI> Combined experimental and theoretical study was conducted. </LI> <LI> High strain between core and shell of thin core-shell NPs induce de-wetting and oxidation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>