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Joe, Ara,Park, Se-Ho,Kim, Da-Jung,Lee, Yeong-Ju,Jhee, Kwang-Hwan,Sohn, Youngku,Jang, Eue-Soon Elsevier 2018 Journal of Solid State Chemistry Vol.267 No.-
<P><B>Abstract</B></P> <P>We have previously shown that the bactericidal effect of ZnO nanoparticles in the absence of a light source originates from the released Zn<SUP>2+</SUP> ions. The purpose of this study was to explore antibacterial activity arising from photo-induced reactive oxygen species (ROS) of ZnO nanoparticles under UV-A light irradiation. To achieve this, <I>S. aureus</I> and <I>K. pneumoniae</I> bacteria were exposed to three different ZnO nanoparticles under UV-A light. The concentrations of the ZnO nanoparticles were low, such that the antibacterial effect of the dissolved Zn<SUP>2+</SUP> ions was negligible. From various empirical evidence, we found that the oxygen defects of the ZnO crystals enhanced the photogeneration of ROS and consequently, the ZnO nanoplates (NPs) with the polar facets exhibited the most pronounced antibacterial activity under UV-A stimulation. To enhance the antimicrobial activity of the NPs, we successfully synthesized silver-nanoparticle-decorated ZnO NPs and explored their antibacterial activity compared to that of the NPs.</P>
대학생의 사회적지지가 진로장벽에 미치는 영향에서 그릿의 매개효과
유지애(Yu, JiAe),조은애(Joe, EunAi),이아라(Lee, ARa) 학습자중심교과교육학회 2019 학습자중심교과교육연구 Vol.19 No.10
본 연구는 대학생의 사회적지지가 진로장벽에 미치는 영향에서 그릿이 매개하는지 확인하고, 이를 통해 대학생의 진로장벽을 낮추기 위해 진로상담과 교육에서 무엇에 초점을 두어야 하는지 이해하기 위해 진행되었다. 이를 위해 2019년 3월~4월에 거쳐 취업을 준비하고 있는 대학생 317명을 대상으로 사회적지지, 진로장벽, 그릿 검사를 실시하였다. 각 연구변인의 상관관계분석을 실시하였으며, 그릿의 매개효과를 알아보기 위하여 순차적 회귀분석을 실시하였다. 본 연구의 결과는 다음과 같다. 첫째, 사회적지지와 그릿은 유의미한 정적상관을 나타냈고, 이 두 변인은 각각 진로장벽과 유의미한 부적상관을 나타냈다. 둘째, 사회적지지는 진로장벽에 유의미한 영향을 미치는 것으로 나타났다. 셋째, 사회적지지가 진로장벽에 미치는 영향에서 그릿이 부분매개하였다. 이러한 연구결과는 대학생의 진로장벽을 낮추기 위해 사회적지지가 중요함을 재확인 한 것이며, 대학생들의 그릿을 증진시키는 개입이 유용할 수 있음을 시사하는 것이다. 연구의 결과로 대학생 대상 진로상담 및 교육에 주는 시사점과 연구의 제한점에 대해 논의하였다. This study aims to (a) investigate whether grit mediates the effects of social support on career barrier for undergraduates and (b) identify the essential focus of career counseling and education required to lower the career barrier for undergraduates. To this end, a questionnaire survey on social support, career barrier, and grit was administered between March and April 2019 to 317 undergraduates preparing for employment. Each study variable was analyzed with descriptive statistics, a reliability test, and correlational analysis, and the mediating effects of grit were examined using sequential logistic regression. The results were as follows. First, a significant positive correlation was seen between social support and grit, and each of these two variables showed a significant negative correlation to career barrier. Second, social support had a significant effect on career barrier. Third, grit partially mediated the effects of social support on career barrier. These results reaffirm that social support is crucial in lowering the career barrier for undergraduates, suggesting that interventions to improve students’ grit may be useful in this regard. Based on these results, the implications for career counseling and education for undergraduates are discussed along with the limitations of the study.
Growth Mechanism of Gold Nanorods in Binary Surfactant System
Bo-Mi Kim,Sun-Hwa Seo,Ara Joe,심규동,장의순 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.6
In order to reveal the growth mechanism of gold nanorods (GNRs) in a binary surfactant system, we synthesized various GNRs by changing the concentration of the surfactants, AgNO3, and HBr in the growth solution. We found that the benzyldimethylhexadecylammoniumchloride surfactant had weak interaction with the gold ions, but it could reduce the membrane fluidity. In addition, we could dramatically decrease the cetyltrimethylammonium bromide concentration required for GNR growth by adding an HBr solution. Notably, Ag+ ions were necessary to break the symmetry of the seed crystals for GNR growth, but increasing the concentration of Ag+ and Br− ions caused a decrease in the template size.
Yun, Kum-Hee,Seo, Sun-Hwa,Kim, Bo-Mi,Joe, Ara,Han, Hyo-Won,Kim, Jong-Young,Jang, Eue-Soon Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.9
Irradiation of gold nanorods (GNRs) with laser light corresponding to the longitudinal surface plasmon oscillation results in rapid conversion of electromagnetic energy into heat, a phenomenon commonly known as the photothermal effect of GNRs. Herein, we propose a facile strategy for increasing the photothermal conversion efficiency of GNRs by integration to form graphene oxide (GO) nanocomposites. Moreover, conjugation of iron oxide (IO) with the GO-GNR nanohybrid allowed magnetic enrichment at a specific target site and the separated GO-IO-GNR assembly was rapidly heated by laser irradiation. The present GO-IO-GNR nanocomposites hold great promise for application in various biomedical fields, including surface enhanced Raman spectroscopy imaging, photoacoustic tomography imaging, magnetic resonance imaging, and photothermal cancer therapy.
Kum-Hee Yun,Sun-Hwa Seo,Bo-Mi Kim,Ara Joe,Hyo-Won Han,김종영,장의순 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.9
Irradiation of gold nanorods (GNRs) with laser light corresponding to the longitudinal surface plasmon oscillation results in rapid conversion of electromagnetic energy into heat, a phenomenon commonly known as the photothermal effect of GNRs. Herein, we propose a facile strategy for increasing the photothermal conversion efficiency of GNRs by integration to form graphene oxide (GO) nanocomposites. Moreover, conjugation of iron oxide (IO) with the GO-GNR nanohybrid allowed magnetic enrichment at a specific target site and the separated GO-IO-GNR assembly was rapidly heated by laser irradiation. The present GO-IO-GNR nanocomposites hold great promise for application in various biomedical fields, including surface enhanced Raman spectroscopy imaging, photoacoustic tomography imaging, magnetic resonance imaging, and photothermal cancer therapy.
광촉매 활성이 우수한 판상형 ZnO 결정의 대용량 합성
김다정,김보미,조아라,심규동,한효원,노경현,장의순,Kim, Da-Jung,Kim, Bo-Mi,Joe, Ara,Shim, Kyu-Dong,Han, Hyo-Won,Noh, Gyung-Hyun,Jang, Eue-Soon 대한화학회 2015 대한화학회지 Vol.59 No.2
결정핵-매개 소프트-용액 방법을 이용하여 판상형 ZnO 나노입자를 합성하였다. 합성된 판상형 ZnO 나노입자는 많은 결함이 존재하는 (0001)면이 발달하여 상업적인 ZnO 나노입자 보다 광촉매 특성이 우수하였다. 또한, 판상형 ZnO 나노입자의 세포독성이 실리카 코팅을 통해 감소함을 확인하였다. 마지막으로 판상형 ZnO를 합성하는데 필요한 성장용액의 다양한 시약 조건들을 변화시키면서 상업적인 적용이 가능한 수백 그램 스케일로 대량합성 하는데 처음으로 성공하였다. ZnO nanoplates were prepared by seed-mediated soft-solution process. Photocatalytic property of ZnO nanoplates was superior to that of conventional ZnO nanoparticles owing to the enhanced (0001) plane with large defect sites. In addition, we found that silica coating method could provide to reduce cytotoxicity of ZnO nanoplates. Finally, we have successfully synthesized for the first time large-scale synthesis of plate-type ZnO as few hundreds gram scale for industrial applications through controlling various reagents of growth solution.