The Durability and Degradation analysis of MEA for Polymer Eletrolyte Membrane Fuel Cells

전소미,전유권,김태언,박정호,조용일,설용건 한국공업화학회 2013 한국공업화학회 연구논문 초록집 Vol.2013 No.-

나문재 추출물 함유 크림의 안정성 평가에 관한 연구

전소미 ( So Mi Jeon ),안정엽 ( Jeung Youb Ahn ),박수남 ( Soo Nam Park ) 대한화장품학회 2007 대한화장품학회지 Vol.33 No.4

본 연구에서는 0.3 % 나문재 에틸아세테이트 추출물(이하 추출물) 함유 제품의 안정성을 평가하였다. 추출물 함유 크림을 12주 동안 온도별 저장(0 ℃, 25 ℃, 37 ℃ 및 45 ℃)과 태양광선에의 노출 조건에서 4주 간격으로 pH, 흡광도 및 점도의 변화를 측정하였다. 온도별 저장조건에서 추출물이 함유되어 있지 않은 대조군 크림은 상기 온도 조건에서 pH 변화가 거의 없었다. 추출물 함유 크림의 경우는 0 ℃ ~ 37 ℃에서 pH가 0.08 감소하였고, 45 ℃ 저장과 태양광선 노출 시는 각각 0.51 및 0.66 감소하였다. 12주 동안 0 ℃ ~ 37 ℃에서는 추출물 함유 제품의 흡광도 변화가 거의 없었다. 반면에 45 ℃ 저장과 태양광선 노출시킨 경우는 흡광도가 각각 7.6 % 및 7.4 % 감소하였다. 크림으로부터 추출물을 용출시킨 에탄올 용액을 태양광선에 직접 노출시켰을 때 4주 만에 흡광도가 48.3% 감소한 것에 비해서는 작은 감소를 나타낸다. 이는 추출물이 크림 내에서 비교적 안정화되어 있음을 나타낸다. 온도별 저장 조건에서 12주 후 추출물 함유 크림과 대조군 크림의 점도를 측정하였다. 추출물 함유 크림은 초기 점도보다 평균 1,748 cPs 증가를 나타내었고, 대조군은 평균 951 cPs 증가하였다. 태양광선 노출 조건에서 대조군은 12주 후 오히려 점도가 4,022 cPs나 큰 감소폭을 나타내었다. 반면에 동일 조건에서 추출물 함유 크림의 점도는 2,483 cPs 증가하였다. 이는 나문재 추출물이 태양광선에 대항하는 보호제로 작용하여 크림의 점도를 유지시켜 제품을 안정화시키는데 기여한 것으로 보여진다. 첨부해서, 추출물 함유 크림과 대조군 크림은 12주 동안 동일한 실험 조건에서, 냄새나 색상 변화가 거의 없었다. 이와 같은 결과들은 나문재 추출물을 함유한 크림은 비교적 안정하지만 장기간 보관 시에는 안정성에 문제가 나타날 수 있음을 시사한다. 따라서 제품 응용시 나문재 성분들이 항산화 효과를 발휘하고 제품 안정에 기여할 수 있도록 보완 연구가 필요하다고 생각된다. In the previous study, the anti-oxidant activity of extract/fraction of Sueada asparagoides (SA) was investigated and the results showed that the ethylacetate (EtOAc) fraction and its aglycone fraction had the best performance on the free radical scavenging activity, reactive oxygen species scavenging (ROS) activity and cell protective activity (J. Soc. Cosme. Scientists Korea, 33(3), 145 (2007)). In this study, the stability of cream containing 0.3% SA EtOAc extract (called extract below) was evaluated. pH, viscosity and absorbance (363 nm) were measured under the 4 different temperatures (0 ℃, 25 ℃, 37 ℃ and 45 ℃) and under the sun light at the 4 week intervals during the 12 weeks in total. The control cream without containing the extract did not show pH change under the different temperatures mentioned above. However, the pH of the cream the extract was decreased 0.08 at the temperature ranges of 0 ℃ to 37 ℃. Under the 45 ℃ and sun light condition, the pH was decreased 0.51 and 0.66, respectively. The cream containing the extract did not show absorbance change at the temperature ranges of 0 to 37 ℃ for 12 weeks. Instead, the absorbance of the cream treated under 45 ℃ and sun light condition was decreased 7.6 % and 7.4 %, respectively. This decrease in absorbance is relatively small compared to the 48.3 % decrease of the extract sampled from the cream using ethanol solution. This indicates that the extract is stabilized in the cream. After treating the cream for 12 weeks under the different temperatures, the viscosity was measured for the cream containing the extract and control cream. The values were increased by 1,748 cPs in average compared to the initial value for the former and by 951 cPs in average for the latter. On the other hand, the viscosity of control cream treated under the sun light for 12 weeks was significantly decreased (4,022 cPs) relative to the cream containing the extract, which showed 2,484 cPs increase in viscosity. This indicates that the SA extract contributes to the stability of the emulsion product by protective effect to maintain the viscosity of the cream against sun light. In addition, any change in color or smell was not observed through 12 weeks of the experimental time period. Thus, it is concluded that it is still not clear in the stability of the cream containing the extract when it is stored for the long time. Accordingly, it is suggested that further study is needed to provide more information to the manufactures, who are seeking for the application of the extract to improve the anti-oxidant activity and stability of cosmetic products.

함초(나문재 및 퉁퉁마디) 추출물의 항산화 작용에 관한 연구(I)

전소미 ( So Mi Jeon ),김소이 ( So I Kim ),안정엽 ( Jeung Youb Ahn ),박수남 ( Soo Nam Park ) 대한화장품학회 2007 대한화장품학회지 Vol.33 No.3

본 연구에서는 함초 추출물(나문재 및 퉁퉁마디)의 항산화능을 조사하였다. 나문재 추출물의 free radical (1,1-diphenyl-2-picrylhydrazyl, DPPH) 소거활성(FSC₅₀)은 100 % ethanol 추출물(329.33 g/mL) < 50 % ethanol 추출물(40.73) < ethylacetate 분획(13.87) < ethylacetate 분획에서 당을 제거시킨 aglycone 분획(7.80) 순으로 증가하였다. 퉁퉁마디의 경우, free radical 소거활성은 ethylacetate 분획 및 aglycone 분획이 각각 23.21 및 28.50 g/mL이었다. Luminol-의존성 화학발광법을 이용한 Fe³⁺- EDTA/H₂O₂ 계에서 생성된 활성산소종(reactive oxygen species, ROS)에 대한 나문재 추출물의 총항산화능은 50 % ethanol 추출물(OSC₅₀, 0.99 g/mL) < ethylacetate 분획(0.05) < aglycone 분획(0.03)순으로, aglycone 분획에서 가장 큰 활성을 나타내었다. 퉁퉁마디의 경우, ethylacetate 분획 및 당을 제거시킨 aglycone 분획의 ROS 소거활성은 각각 0.10 및 0.20 g/mL이었다. 나문재 및 퉁퉁마디 추출물에 대하여 rose-bengal로 증감된 사람 적혈구의 광용혈에 대한 억제 효과를 측정하였다. 100 % ethanol 나문재 추출물의 경우 농도 의존적(1 ∼ 100 g/mL)으로 광용혈을 억제하였다. 특히 ethylacetate 분획에서 당을 제거시킨 aglycone 분획은 50 g/mL 농도에서 τ₅₀이 310 min으로 매우 큰 세포보호 효과를 나타내었다. 퉁퉁마디의 경우는 ethylacetate 분획에서 비교적 큰 세포보호 활성을 나타내었다. 이상의 결과들은 나문재 추출물이 ¹O₂ 혹은 다른 ROS를 소광시키거나 소거함으로써 그리고 ROS에 대항하여 세포막을 보호함으로써 생체계, 특히 태양 자외선에 노출된 피부에서 항산화제로서 작용할 수 있음을 가리킨다. In this study, the antioxidative effects of Sueada asparagoides and Salicornia herbacea extracts were investigated. The free radical (1,1-diphenyl-2-picrylhydrazyl, DPPH) scavenging activity (FSC₅₀) of extract/fractions of Sueada asparagoides was in the order: 100 % ethanol extract (329.33 g/mL) < 50 % ethanol extract (40.73) < ethylacetate fraction (13.87) < deglycosylated aglycone fraction (7.80). In case of Salicornia herbacea, the free radical scavenging activities of ethylacetate fraction and aglycone fraction were 13.87 and 7.80 g/mL, respectively. Reactive oxygen species (ROS) scavenging activities (OSC₅₀) of Sueada asparagoides and Salicornia herbacea extracts on ROS generated in Fe³⁺-EDTA/H₂O₂ system were investigated using the luminol-dependent chemiluminescence assay. The order of ROS scavenging activity of Sueada asparagoides extracts was 50 % ethanol extract (OSC₅₀, 0.99 g/mL) < ethylacetate fraction (0.05) < aglycone fraction (0.03). Aglycone fraction showed the most prominent scavenging activity. In case of Salicornia herbacea, the ROS scavenging activities of ethylacetate fraction and aglycone fraction were 0.10 and 0.20 g/mL, respectively. The protective effects of extract/fractions of Sueada asparagoides and Salicornia herbacea on the rose-bengal sensitized photohemolysis of human erythrocytes were investigated. The ethanol extract (100 %) of Sueada asparagoides diminished photohemolysis in a concentration dependent manner (1 ∼ 100 g/mL). Particularly deglycosylated aglycone fraction exhibited the most prominent celluar protective effect (τ₅₀, 310 min at 50 g/mL). In case of Salicornia herbacea, ethylacetate fraction exhibited more potent protective effect. These results indicate that extract/fractions of Sueada asparagoides can function as antioxidants in biological systems, particularly skin exposed to UV radiation by scavenging ¹O₂ and other ROS, and protect cellular membranes against ROS.

고분자 전해질 막 연료전지에서의 아이오딘이 코팅된 분리판의 성능 효과

김태언,전소미,조광연,설용건 한국수소및신에너지학회 2013 한국수소 및 신에너지학회논문집 Vol.24 No.1

Polymer exchange membrane (PEM) fuel cells have multifunctional properties, and bipolar plates are one of the key components in these fuel cells. Generally, a bipolar plate has a gas flow path for hydrogen and oxygen liberated at the anode and cathode, respectively. In this study, the influence of iodine applied to a bipolar plate was investigated. Accordingly, we compared bipolar plates with and without iodine coating, and the performances of these plates were evaluated under operating conditions of 75oC and 100% relative humidity. The membrane and platinum-carbon layer were affected by the iodine-coated bipolar plate. Bipolar plates coated with iodine and a membrane-electrode assembly (MEA) were investigated by electron probe microanalyzer (EPMA) and energy-dispersive x-ray spectroscopy (EDS) analysis. Polarization curves showed that the performance of a coated bipolar plate is approximately 19% higher than that of a plate without coating. Moreover, electrochemical impedance spectroscopy (EIS) analysis revealed that charge transfer resistance and membrane resistance decreased with the influence of the iodine charge transfer complex for fuel cells on the performance.

표면처리된 실리콘 카바이드 섬유 복합막의 고분자 전해질 막 연료전지 성능

박정호,김태언,전소미,조용일,조광연,설용건 한국수소및신에너지학회 2014 한국수소 및 신에너지학회논문집 Vol.25 No.1

The organic-inorganic composite membrane in polymer exchange membrane fuel cells (PEMFCs) haveseveral fascinating technological advantages such as a proton conductivity, thermal stability and mechanicalproperties. As the inorganic filler, silicon carbide (SiC) fiber have been used in various fields due to its uniqueproperties such as thermal stability, conductivity, and tensile strength. In this study, composite membrane wassuccessfully fabricated by modified-silicon carbide fiber. Modified process, as a novel process in SiC, takes reactionby phosphoric acid after oxidation process (generated homogeniusly SiO2 layer on SiC fiber). The mechanicalproperty which was conducted by tensile test of the 5wt% modified-SiO2@SiCf composite membrane was betterthan that of Aquivion casting membrane as well as ion cxchange capacity(IEC) and proton conductivity. In addition,the single cell performance was observed that the 5wt% modified-SiO2@SiCf composite membrane wasapproximately 0.2A/cm2 higher than that of a Aquivion casting electrolyte membrane and electrochemical impedancewas improved with the charge transfer resistance and membrane resistance.

Synthesis of low oxygen contents SiC/TiC hybrid web for high thermal conducting composite

박정호,김태언,전소미,조광연,설용건 한국공업화학회 2013 한국공업화학회 연구논문 초록집 Vol.2013 No.-

마이크로웨이브를 이용한 고분자 전해질 연료전지용 복합 탄소촉매 지지체 (ACF/Graphene)의 합성과 전기화학적 거동

조용일,전유권,박대환,전소미,김태언,오경석,설용건 한국수소및신에너지학회 2013 한국수소 및 신에너지학회논문집 Vol.24 No.2

Carbon materials are mainly used as catalyst supports for polymer exchange membrane fuel cell(PEMFC). Catalyst supports are required specific characteristics of the carbon materials, such as large surface area and high electrical conductivity. Attempted were to improve electrical conductivity and to maintain high surface area of carbon materials using a microwave treatment. Microwave treatment, as a relatively new technique, takes short reaction time and reduce the consumption of the gases used for carbon treatment compared to a traditional heat treatment. Hybrid carbon (ACF/Graphene) as catalyst supports by microwave-irradiation method for PEMFC increase the cell performance because of increased electrical conductivity resulting in triple-phase contact and reduced the interfacial resistance. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-Ray Diffraction (XRD) were employed to analyze carbon materials. The performance of microwave-treated carbon materials was evaluated by measuring current-voltage (I-V) characteristics and electrode impedance.

주민주도형 도시재생을 위한 목공 커뮤니티 공간 연구

김민(Kim, Min),전소미(Jeon, SoMi),박수경(Park, Su Kyong) 한국주거학회 2023 한국주거학회 학술대회논문집 Vol.35 No.2

TS-1 membrane for the separation of ethylbenzene from Mixed Xylene

전유권,설용건,이기천,박명근,전소미 한국공업화학회 2011 한국공업화학회 연구논문 초록집 Vol.2011 No.1

자연과 함께하는 미술심리치료 공간 조성에 대한 연구

박진서(Park, Jin Seo),전소미(Jun, So Mi),한수지(Han, Su Jee),박수경(Park, Su Kyung) 한국주거학회 2022 한국주거학회 학술대회논문집 Vol.34 No.2