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김도형,곽다희,한상범,김민철,박현석,박진영,원지은,마경배,박경원 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.54 No.-
In a macrocyclic structure, the contribution of the metal-N4 sites to oxygen reduction reaction (ORR) remains controversial.In this study, to investigate the contribution of macrocyclic cathode catalysts to the ORR properties in the macrocyclic sites excluding various synthetic conditions, the macrocyclic cathode catalysts were prepared using an electrochemical polymerization method at room temperature. The ORR activity of the deposited electrodes as catalysts was evaluated in an alkaline medium. To clarify the core metal as an active site in the macrocyclic structure as a cathode catalyst for the ORR, a CN-poisoning test of core metal site was performed.
Nitrogen-doped bi-modal porous carbon nanostructure derived from glycine for supercapacitors
최인애,곽다희,한상범,박경원 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.63 No.-
We prepared a nitrogen-doped bi-modal porous carbon nanostructure (G-500/20) using a template method with 500 and 20 nm SiO2 beads and glycine. The G500/20 has a surface area of 403 m2 g−1 with meso/macroporous structure and N-doping content of 5.9 at%. In the supercapacitor performance, G-500/20 exhibits superior specific capacitances of 19.5 and 5.3 F g−1 at 200 mV s−1 and 20 A g−1 in 6 M NaOH, compared to a commercial activated carbon. In particular, the superior capacitances of G500/20 at high scan rates and current densities were achieved due to the bi-modal porous structure and nitrogen doping effect.
Antioxidant Activity and Whitening Efficacy of Makgeolli Fractions
박경원,곽다희,권혜진,Park, Kyung-won,Kwak, Da-hee,Kwon, Hye-Jin The Society of Digital Policy and Management 2017 디지털융복합연구 Vol.15 No.10
본 연구에서는 식품으로 널리 애용되고 있는 막걸리의 항산화효능 및 티로시나아제 활성 억제효과를 연구하여 기능성 화장품 소재로서의 가능성을 평가하고자 하였다. 시료는 시판 막걸리 잔사에 MeOH 3 L를 가한 후 얻어진 현탁액을 농축한 후 EtOAc 3 L을 가하고 분획하여 상층을 최종시료로 사용하였다. MTT assay 평가에서는 $100{\sim}1,000{\mu}g/mL$ 범위의 농도에서 세포독성이 전혀 나타나지 않았고, 항산화활성은 농도 의존적 경향을 보였으며, EC50은 7.008 mg/mL로 높은 활성을 보였다. 또 티로시나아제 저해 활성 결과 추출물의 IC50 값은 49.22 mg/mL로 나타났다. 이상의 결과로 본 시료는 기능성화장품 원료로서의 가능성이 있음을 확인하였다. This study aimed at evaluating the potential of makgeolli, which is widely consumed as beverage, as a functional cosmetic ingredient, based on analyses on its antioxidant activity and tyrosinase activity inhibitory effect. The sample was extracted by concentrating the suspension obtained after adding MeOH (3 L) to the residue of a commercial makgeolli and then adding EtOAc (3 L) to the concentrate, which was subjected to fractionation. The upper layer of the fractions was used as the final sample. In MTT assay assessments, no cytotoxicity was observed at a concentration range of 10 to $1,000{\mu}g/mL$; the antioxidant activity of the extract showed a concentration-dependent tendency and it had a high activity with an $EC_{50}$ of 7.008 mg/mL. Also, in a tyrosinase activity inhibitory effect assessment, the extract showed an $IC_{50}$ value of 39.22 mg/mL. These results confirmed that this sample has potential as a functional cosmetic ingredient.
권석희,한상범,곽다희,송지현,박경원 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
Various doped porous carbon nanomaterials to replace Pt-based catalysts for oxygen reduction reaction(ORR) in acid and alkaline media have been intensively studied. Herein, doped porous carbonnanostructure materials as non-precious metal catalysts for ORR are synthesized using different weightratios of polyaniline (PANI) to dicyandiamide (DCDA) as carbon source and dopants with iron salt tocontrol the specific surface area and nitrogen doping content. The as-prepared samples exhibit welldefinedporous carbon structure that consists of micro- and meso-pores, high specific surface areas,increased amount of nitrogen dopant, and relative content of graphitic N and pyridinic nitrogen N. Amongthese doped porous carbon nanostructure catalysts, the catalyst synthesized using a proper ratio of PANIto DCDA exhibits significantly improved electrocatalytic performance for ORR, i.e., high half-wavepotential, high specific activity, and enhanced stability in both acid and alkaline media, because of thehigh graphitic N/pyridinic nitrogen N and micro-pore ratios.