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Energy materials for energy conversion and storage: focus on research conducted in Korea
김인예,Ko Jaehwan,안태영,정해원,윤영수 한국세라믹학회 2021 한국세라믹학회지 Vol.58 No.6
Fossil fuels are widely used around the world, resulting in adverse effects on global temperatures. Hence, there is a growing movement worldwide towards the introduction and use of green energy, i.e., energy produced without emitting pollutants. Korea has a high dependence on fossil fuels and is thus investigating various energy production and storage technologies for producing and using green energy. Renewable energy technologies are essential for producing green energy, and energy storage technologies are necessary for its effective use. In Korea, the renewable energy technologies of most interest are solar power generation and fuel cells, followed by energy storage, transportation. This review intends to provide information about the energy materials currently being researched to develop these energy technologies.
Calcium Sensitization Induced by Sodium Fluoride in Permeabilized Rat Mesenteric Arteries
양은예,조준용,손의동,김인겸 대한약리학회 2010 The Korean Journal of Physiology & Pharmacology Vol.14 No.1
It was hypothesized that NaF induces calcium sensitization in Ca2+-controlled solution in permeabilized rat mesenteric arteries. Rat mesenteric arteries were permeabilized with β- escin and subjected to tension measurement. NaF potentiated the concentration-response curves to Ca2+ (decreased EC50 and increased Emax). Cumulative addition of NaF (4.0, 8.0 and 16 mM) also increased vascular tension in Ca2+-controlled solution at pCa 7.0 or pCa 6.5, but not at pCa 8.0. NaF-induced vasocontraction and GTPγS-induced vasocontraction were not additive. NaF-induced vasocontraction at pCa 7.0 was inhibited by pretreatment with Rho kinase inhibitors H1152 or Y27632 but not with a MLCK inhibitor ML-7 or a PKC inhibitor Ro31-8220. NaF induces calcium sensitization in a Ca2+- dependent manner in β-escin-permeabilized rat mesenteric arteries. These results suggest that NaF is an activator of the Rho kinase signaling pathway during vascular contraction.
Influence of temperature on performance of CuV2O6 cathode for high voltage thermal battery
노형철,김인예,안태영,정해원,윤영수 한국세라믹학회 2021 한국세라믹학회지 Vol.58 No.4
The infl uence of heat treatment on the material properties and electrochemical properties of CuV 2 O 6 , as a candidate cathode for thermal batteries, was evaluated, where the discharge capacity and open-circuit voltage were measured. The properties of CuV 2 O 6 calcined at diff erent temperatures were determined using X-ray diff raction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy (XPS), thermal gravimetric analysis (TGA) and transmission electron microscopy (TEM) and energy dispersive spectroscopy. CuV 2 O 6 was synthesized from NH 4 VO 3 and CuCl 2 via the hydrothermal method, and the XRD pattern was consistent with PDF#01-074-2117. The syn- thesized CuV 2 O 6 was calcined at diff erent temperatures, and the infl uence of calcination on the structures was analyzed by SEM and TEM. The SEM and TEM images showed that CuV 2 O 6 was formed as rod-shaped crystals that gradually grew with increasing calcination temperature. However, upon calcination at 600 °C, the morphology of CuV 2 O 6 was not maintained and the compound decomposed irregularly. XPS analysis showed that CuV 2 O 6 is changed to Cu 2 V 2 O 7 at higher calcination temperatures. Less than 5% weight change was observed in the TGA curves, including an increase in the weight at a higher temperature. The capacity of the CuV 2 O 6 samples was approximately 300350 mAh/g as determined from the discharge curve, and CuV 2 O 6 calcined at 550 °C had a higher activation energy than the other samples. Calcination at higher tempera- ture could aff ord enhanced battery capacity. The data indicate that CuV 2 O 6 may be a viable candidate material for thermal battery cathodes.
A New Approach: Li2S-P2S5 Thin-Films Prepared by Thermal Evaporation as Solid Electrolytes
우성필,NITUL KAKATI,김인예,이석희,윤영수 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.4
Li2S-P2S5 thin-film solid electrolytes are synthesized by using room-temperature thermal evaporation for use as lithium-ion conductors for all-solid-state Li-ion batteries. The local structures of 75.51Li2S:24.49P2S5 and 77.64Li2S:22.36P2S5 prepared in this way have hetero units that facilitate lithium-ion mobility. The lithium-ion conductivity at room temperature for the 77.64Li2S:22.36P2S5 thin-film (4.0 × 10−6 S cm−1) is higher than that for the 75.51Li2S:24.49P2S5 thin-film (1.2 × 10−6 S cm−1). The increased ion conductivity in the 77.64Li2S:22.36P2S5 film is due to the additional local P2S4− 7 structure that forms a glassy state during the thermal evaporation process. The local structure can lead to a high mobility of Li+ ions in the Li2S-P2S5 system due to the non-bridging sulfide ions. Lithium-ion-conducting thin-films prepared by using thermal evaporation, as reported in this study, are promising solid electrolytes.
Flavone Attenuates Vascular Contractions by Inhibiting RhoA/Rho Kinase Pathway
백인지,전수분,송민지,양은예,손의동,김인겸 대한약리학회 2009 The Korean Journal of Physiology & Pharmacology Vol.13 No.3
Our previous study demonstrated that flavone inhibits vascular contractions by decreasing the phosphorylation levelof the myosin phosphatase target subunit (MYPT1). In the present study, we hypothesized that flavone attenuates vascular contractions through the inhibition of the RhoA/Rho kinase pathway. Rat aortic rings were denuded of endothelium, mounted in organ baths, and contracted with either 30 nM U46619 (a thromboxane A2 analogue) or 8.0 mM NaF 30 min after pretreatment with either flavone (100 or 300μM) or vehicle. We determined the phosphorylation level of the myosin light chain (MLC20), the myosin phophatase targeting subunit 1 (MYPT1) and the protein kinase C-potentiated inhibitory protein for heterotrimeric myosin light chain phophatase of 17-kDa (CPI17) by means of Western blot analysis. Flavone inhibited, not only vascular contractions induced by these contractors, but also the levels of MLC20 phosphorylation. Furthermore, flavone inhibited the activation of RhoA which had been induced by either U46619 or NaF. Incubation with flavone attenuated U46619- or NaF-induced phosphorylation of MYPT1Thr855 and CPI17Thr38, the downstream effectors of Rho-kinase. In regards to the Ca2+-free solution, flavone inhibited the phosphorylation of MYPT1Thr855 and CPI17Thr38, as well as vascular contractions induced by U46619. These results indicate that flavone attenuates vascular contractions, at least in part, through the inhibition of the RhoA/Rho-kinase pathway.