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Kyeom Seon Do,Tae-hyeon Baek,Min Gu Kang,Sung Jin Choi,Gi Hwan Kang,Gwon-Jong Yu,이정철,명재민,Hee-eun Song 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.3
A reduction in silicon material consumption in the photovoltaic industry is required for cost reduction. Using crystalline silicon wafers of less than 120 microns of thickness is a promising way for cost and materialreduction in the solar cell production. The standard thickness of crystalline silicon solar cells is currentlyaround 180 microns. If the wafers are thinner than 100 microns in the silicon solar cells, the amount of siliconwill be reduced by almost half, which should result in prominent cost reduction. With this aim, many groupshave worked with thin crystalline silicon wafers. However, most of them have studied with small size substrates. In this paper, we present the electrical characteristics for thin single crystalline silicon solar cells of 100and 115 μm thickness and 156×156 mm2area manufactured through a conventional process. We have achieved17.2% conversion efficiency with a 115 μm silicon substrate and 16.8% with a 100 μm substrate. This enablesthe commercialization of the thin crystalline silicon solar cells with high conversion efficiency. We also suggestissues to be solved in thin crystalline silicon solar cell manufacturing.
Quality Evaluation on Use of Camellia Oil as an Alternative Method in Dried Seaweed Preparation
Jae Kyeom Kim,Hui Gyu Park,Cho Rong Kim,Ho-Jeong Lim,Kye Man Cho,Jine Shang Choi,Dong-Hoon Shin,Eui-Cheol Shin 한국식품영양과학회 2014 Preventive Nutrition and Food Science Vol.19 No.3
The fatty acid and volatile compound compositions of camellia oil were analyzed in this study. The impacts of the replacement of conventional vegetable oil with camellia oil on the sensory attributes of dried seaweed were also determined. C18:1 (83.59%), followed by C16:0 and C18:2, were the most abundant fatty acids in camellia oil. A total of 11 and 32 volatile compounds were identified in camellia oil and sesame oil, respectively. In the preference test, the camellia oil samples received a higher, although insignificant, liking rating in overall acceptability of appearance. Overall, there were no differences between the sensory attributes of camellia oil and sesame oil. This finding, combined with the unique fatty acid composition, thermal stability, and health benefits of camellia oil indicate that further study into the use of camellia oil in foods is warranted.
흑연 종류에 따른 산화 그래핀의 제조 및 정제를 통한 특성연구
정겸(Kyeom Jeong),김영호(Young-Ho Kim) 한국청정기술학회 2021 청정기술 Vol.27 No.2
우수한 물리적, 전기적 특성과 독특한 물성의 특성을 갖고 있는 그래핀의 연구가 활발히 진행되면서, 대표적인 화학적 박리방법인 Hummer’s 방법을 응용하여 고품질의 산화 그래핀의 대량생산 가능성을 검토하였다. 본 연구에서는 산화 그래핀의 제조에 있어서 천연흑연, 결정성 흑연, 팽창흑연을 사용하였으며, 과망간산칼륨의 첨가량, 반응온도, 반응시간을 달리하였다. 또한, 제조된 산화 그래핀의 품질을 알기위해 푸리에 변환 적외선 분광분석(fourier transform infrared spectroscopy, FT-IR), 라만분광기(raman spectroscopy), 투과 전자 현미경(transmission electron microscopy, TEM)을 이용하였으며, 결정성 흑연이 가장 좋은 품질을 나타내었다. 제조된 산화 그래핀 정제를 위해 유기용매를 사용하였으며, 에너지분산형 분광분석법(energy-dispersive X-ray spectroscopy, EDS)를 이용하여 분석한 결과 사이클로헥세인을 이용한 정제가 산 폐액과 폐수의 잔류가 거의 없었다. 본 연구에서 제시한 산화 그래핀 제조방법과 유기용매를 이용한 정제는 보다 친환경적인 방법으로 필름, 방열, 코팅제 등 다양한 산업분야에 응용이 가능할 것으로 예상된다. Research is being conducted on graphene to provide graphene having both excellent physical as well as electrical properties in addition to unique physical properties. In this study, Hummer’s method, which is a representative method for chemical exfoliation, was applied in order to investigate the possibility of the mass production of high-quality graphene oxide. Three types of graphite (graphite, crystalline graphite, and expanded graphite) were used in the preparation of graphene oxide with variations in the amount of potassium permanganate added, reaction temperature, and reaction time. Then a Fourier transform infrared spectroscopy (FT-IR), a Raman spectrometer, and a transmission electron microscope (TEM) were used to measure the quality of the prepared graphene oxide. Of the three types of graphite used in this experiment, crystalline graphite showed the highest quality. The prepared graphene oxide was then purified with an organic solvent, and an analysis conducted using energy dispersive X-ray spectroscopy (EDS). From the results of the residual values, we were able to confirm that both acid wastewater and wastewater were best purified using cyclohexane. The method for manufacturing graphene oxide as well as the method of purification using organic solvents that are presented in this study are expected to have less of an environmental impact, making them environmentally friendly. This makes them suitable for use in various industrial fields such as the film industry and for heat dissipation and as coating agents.
Ipomoea batatas Attenuates Amyloid β Peptide-Induced Neurotoxicity in ICR Mice
Jae Kyeom Kim,Soo Jung Choi,Hong Yon Cho,Young Jun Kim,Seung-Taik Lim,김창주,Eun Ki Kim,Hye Kyung Kim,Sabrina Peterson,신동훈 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.3
In this study, the protective effects of 17 Korean native plants against amyloid β peptide (Aβ)-induced oxidative stress were screened using the 2′,7′-dichlorofluorescin diacetate assay and the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. Ipomoea batatas exerted the highest protective effects against oxidative stress and was selected for further investigation. To confirm the protective activity of this extract, the I. batatas extract was fed to ICR mice that had been injected with Aβ to induce neuronal deficits. In these experiments, the extract of I. batatas significantly reversed Aβ-induced neurotoxicity as assessed by the passive avoidance test, a behavioral experiment. Moreover, I. batatas administration reduced the level of lipid peroxidation and increased catalase activities in biochemical studies using the brain tissue of mice. These results indicate that I. batatas might be beneficial against Alzheimer's disease, especially by limiting oxidative stress in the brain.