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분말 합성법(Sol-Gel & Solid-State reaction)에 따른 Lithium Lanthanum Titanate 분말의 입자 및 결정 크기 비교 분석에 관한 연구
윤정재,이승환,백소현,권용범,송요셉,김범성,이빈,곽노균,정다운,Jeungjai Yun,Seung-Hwan Lee,So Hyun Baek,Yongbum Kwon,Yoseb Song,Bum Sung Kim,Bin Lee,Rhokyun Kwak,Da-Woon Jeong 한국분말재료학회 (*구 분말야금학회) 2023 한국분말재료학회지 (KPMI) Vol.30 No.4
Lithium (Li) is a key resource driving the rapid growth of the electric vehicle industry globally, with demand and prices continually on the rise. To address the limited reserves of major lithium sources such as rock and brine, research is underway on seawater Li extraction using electrodialysis and Li-ion selective membranes. Lithium lanthanum titanate (LLTO), an oxide solid electrolyte for all-solid-state batteries, is a promising Li-ion selective membrane. An important factor in enhancing its performance is employing the powder synthesis process. In this study, the LLTO powder is prepared using two synthesis methods: sol-gel reaction (SGR) and solid-state reaction (SSR). Additionally, the powder size and uniformity are compared, which are indices related to membrane performance. X-ray diffraction and scanning electron microscopy are employed for determining characterization, with crystallite size analysis through the full width at half maximum parameter for the powders prepared using the two synthetic methods. The findings reveal that the powder SGR-synthesized powder exhibits smaller and more uniform characteristics (0.68 times smaller crystal size) than its SSR counterpart. This discovery lays the groundwork for optimizing the powder manufacturing process of LLTO membranes, making them more suitable for various applications, including manufacturing high-performance membranes or mass production of membranes.
생체모방 모세관 현상을 이용한 PDMS 구조체 기반 증산발전기 제조기술 연구
이승환,윤정재,백소현,권용범,송요셉,김범성,좌용호,정다운 한국분말재료학회 2023 한국분말재료학회지 (KPMI) Vol.30 No.3
The demand for energy is steadily rising because of rapid population growth and improvements in living standards. Consequently, extensive research is being conducted worldwide to enhance the energy supply. Transpiration power generation technology utilizes the vast availability of water, which encompasses more than 70% of the Earth's surface, offering the unique advantage of minimal temporal and spatial constraints over other forms of power generation. Various principles are involved in water-based energy harvesting. In this study, we focused on explaining the generation of energy through the streaming potential within the generator component. The generator was fabricated using sugar cubes, PDMS, carbon black, CTAB, and DI water. In addition, a straightforward and rapid manufacturing method for the generator was proposed. The PDMS generator developed in this study exhibits high performance with a voltage of 29.6 mV and a current of 8.29 μA and can generate power for over 40h. This study contributes to the future development of generators that can achieve high performance and long-term power generation.
한약재 단일 추출물 및 복합 추출물을 이용한 아토피성 피부염 억제 효과
이문희(Moon Hee Lee),한민호(Min Ho Han),윤정재(Jung Jeh Yoon),송명규(Myung Kyu Song),김민주(Min Ju Kim),홍수현(Su Hyun Hong),최병태(Byung Tae Choi),김병우(Byung Woo Kim),황혜진(Hye Jin Hwang),최영현(Yung Hyun Choi) 한국생명과학회 2014 생명과학회지 Vol.24 No.8
본 연구에서는 1-chloro-2,4-dinitrobenzene (DNCB)에 의해 유도된 아토피성 피부염 마우스 모델에서 고삼, 감초 및 백선피 추출물과 그들 복합 추출물(GGB)의 항아토피 효능을 평가하였다. 아토피성 피부염의 병리학적 형태인 홍반, 귀부종, 부종, 각질과 상처는 복합 추출물 중 고삼, 감초 및 백선피 추출물이 3:1:1로 혼합된 GGB-1 처리군에서 다른 시료 처리군들에 비하여 유의적인 억제 효능을 나타내었다. 또한 면역 기관인 비장의 무게도 GGB-1 처리군에서 감소하였고, 간의 무게는 정상군과 시료 처리군의 값이 유사한 결과를 나타내었다. 아울러 GGB-1 처리군에서 비만 세포의 침윤이 감소되었으며, 혈청 중 IgE의 농도 역시 GGB-1 처리군에서 가장 낮은 값을 보였다. 비록 단일 한약재와 그들의 혼합물 처리군에서는 면역 사이토카인(IFN-γ, IL- 1, 4, 5, 6, 13, 1β and TNF-α)의 값이 유의적으로 감소되었으나, 여러 가지 결과들을 종합하여 볼 때 고삼, 감초 및 백선피 추출물이 3:1:1로 혼합된 복합추출물인 GGB-1이 아토피성 피부염의 개선에 효과적인 약물로 판단된다. The present study was designed to investigate whether ethanol extracts of Sophora flavescens (GS), Glycyrrhiza uralensis (GC), Dictamnus dasycarpus (BSP), and their mixtures (GGB-1, -2, -3, and -4) inhibit 1-chloro-2,4-dinitrobenzene (DNCB)-induced atopic dermatitis (AD) in a mouse model. DNCB was topically applied on the dorsal surface of Balb/c mice to induce AD-like skin lesions. The pathological phenotypes of AD, such as erythema, ear thickness, edema, scabs, and discharge, were significantly decreased in the GGB (DNCB + GS:GC:BSP = 3:1:1 mixture)-1-treated groups compared with the other treated groups. The weight of the spleen in immune organs was significantly decreased in the GGB-1-treated groups, whereas the weight of the liver in a control group was similar to that of the groups treated with the samples. Furthermore, toluidine blue staining analysis, a method used to specifically identify mast cells, showed that master cell infiltration into the dermis of the GGB-1-treated group was significantly decreased. The immunoglobulin E concentration was lower in the GGB-1-treated group. In addition, the levels of inflammatory cytokines (interferon-γ, interleukin-1, 4, 5, 6, and 13, 1β, and tumor necrosis factor-α) were also significantly reduced in the GGB-1-treated group. Taken together, these results suggest that a mixture of GS, GC, and BSP in a proportion of 3:1:1 (GGB-1) may contribute to the relief of AD symptoms and may be considered an excellent candidate for an AD therapeutic drug.