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Development of Alkali Metal Thermal-to-Electric Converter Unit Cells Using Mo/TiN Electrode
Seog, Seung-won,Choi, Hyun-Jong,Kim, Sun-Dong,Lee, Wook-Hyun,Woo, Sang-Kuk,Han, Moon-Hee The Korean Ceramic Society 2017 한국세라믹학회지 Vol.54 No.3
Molybdenum (Mo), an electrode material of alkali metal thermal-to-electric converters (AMTEC), facilitates grain growth behavior and forms Mo-Na-O compounds at high operating temperatures, resulting in reduced performance and shortened lifetime of the cell. Mo/TiN composite materials have been developed to provide a solution for such issues. Mo is a metal that possesses excellent electrical properties, and TiN is a ceramic compound with high-temperature durability and catalytic activity. In this study, a dip-coating process with an organic solvent-based slurry was used as an optimal coating method to achieve homogeneity and stability of the electrodes. Cell performance was evaluated under various conditions such as the number of coatings, ranging from 1 to 3 times, and heat treatment temperatures of $800-1100^{\circ}C$. The results confirmed that the cell yielded a maximum power of 9.99 W for the sample coated 3 times and heat-treated at $900^{\circ}C$.
Lee, Jae Hyung,Do, Jeong Yeon,Park, No-Kuk,Seo, Myung Won,Ryu, Ho-Jung,Hong, Jin-Pyo,Kim, Yang Soo,Kim, Seog. K.,Kang, Misook Elsevier 2018 Journal of photochemistry and photobiology Chemist Vol.364 No.-
<P><B>Abstract</B></P> <P>This research focuses on the synergy of converting carbon dioxide (CO<SUB>2</SUB>) into methane (CH<SUB>4</SUB>) by simultaneously introducing light and heat as dynamic sources to activate the catalyst. A CaTiO<SUB>3</SUB>@Ni-Pt catalyst, loaded with 30.0 wt.% Ni and 1.0 wt.% Pt on a perovskite CaTiO<SUB>3</SUB> support was introduced. The photo-thermal catalytic hybrid system has two features that distinguish it from other photo- or thermal-catalytic systems. First, unlike the CO<SUB>2</SUB> thermal-methanation reaction where CO<SUB>2</SUB> and H<SUB>2</SUB> react at a molar ratio of 1:4, 2.0 mol of H<SUB>2</SUB> was replaced with 2.0 mol H<SUB>2</SUB>O in the photo-thermal catalytic hybrid system compared to the thermal-methanation reaction requiring 4.0 mol of H<SUB>2</SUB>. Second, by loading Ni and Pt, which are catalytic active species with excellent CO<SUB>2</SUB> and H<SUB>2</SUB> adsorption abilities, the CO<SUB>2</SUB> reduction (46.48%) was promoted and the CH<SUB>4</SUB> selectivity (99.46%) in the product was increased compared to the photo-methanation reaction. The CaTiO<SUB>3</SUB>@Ni-Pt not only inhibited the recombination of the photo-generated charges, but also facilitated the adsorption of the reactants in the photo-thermal hybrid system. The quantum efficiency of the CaTiO<SUB>3</SUB>@Ni-Pt catalyst measured for the photo-thermal hybrid system steadily increased to 180 °C. Nevertheless, this study implies that a photo-thermal hybrid system can be useful to photo-reducing CO<SUB>2</SUB> by adding a small amount of heat. From a thermal reaction standpoint, a photo-thermal hybrid system can be used to reduce the reaction temperature during CO<SUB>2</SUB> thermal-methanation and to reduce the consumption of H<SUB>2</SUB> in half.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A CaTiO<SUB>3</SUB>@Ni-Pt catalyst was applied to the photo-thermo catalytic hybrid system. </LI> <LI> Both of CO<SUB>2</SUB> reduction and CH<SUB>4</SUB> selectivity were increased on CaTiO<SUB>3</SUB>@Ni-Pt. </LI> <LI> The photo-reducing CO<SUB>2</SUB> easily occurred by adding a small amount of heat. </LI> <LI> The photo-thermal system reduced the reaction temperature and the consumption of H<SUB>2</SUB>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Bioactive glass-based nanocomposites for personalized dental tissue regeneration
Lee, Jung-Hwan,Seo, Seog-Jin,Kim, Hae-Won JAPANESE SOCIETY FOR DENTAL MATERIALS AND DEVICES 2016 Dental materials journal Vol.35 No.5
<P>Bioactive glass nanoparticles (BGNs) have been used over a range of dental tissue engineering. One main reason is possibly that BGNs strongly interact with hard tissues, while forming a stable interface after implantation. Recently, BGNs have been further diversified and ameliorated by incorporating bio-functional ions into BGNs or by functionally modifying the surface of BGNs. A comprehensive overview of the processes and applications of BGNs and their derivatives for the use in dentistry is thus necessary for their step forward. Therefore, this review focuses on a variety of processes and practical applications of BGNs and their derivatives, which is expected to aid readerships with understanding and employing BGNs and their derivatives for personalized dental treatments.</P>
Won, A. Reum,Kim, Raeyeong,Jung, Maeng-Joon,Kim, Seog K.,Lee, Young-Ae Elsevier Sequoia [etc.] 2018 Inorganica chimica acta Vol.471 No.-
<P><B>Abstract</B></P> <P>The oxidative DNA cleavage induced by the [Cu(2,2′-bipyridine)<SUB>2</SUB>(NO<SUB>3</SUB>)]NO<SUB>3</SUB> (Cu(bpy)<SUB>2</SUB>) complex was examined using the linear dichroism (LD) technique. Using this method, the oxidative DNA cleavage by the Fenton mechanism was reported to occur through two sequential first-order reactions. As the Cu(bpy)<SUB>2</SUB> concentration increased, the rate constant of both first order reactions increased, as expected. The activation energy of the second step was estimated to be 0.190 kJ mol<SUP>−1</SUP>. A similar method was applied for various synthetic polynucleotides. Poly[d(G-C)<SUB>2</SUB>], poly(dG)·poly(dC), and poly(dA)·poly(dT) produced a time-dependent decrease in LD, which could be elucidated by a single component exponential decay. This observation is in contrast to Fenton-type oxidative DNA cleavage. On the other hand, poly[d(A-T)<SUB>2</SUB>] produced a time-dependent decrease in the LD magnitude, which could be elucidated by two sequential first order reactions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cu(bpy)<SUB>2</SUB> complex induced oxidative DNA cleavage. </LI> <LI> The cleavage rate constant for synthetic polynucleotides depended on the nature of base sequence. </LI> <LI> Poly[d(A-T)<SUB>2</SUB>] produced the mechanism similar to native DNA. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Decrease in the LD magnitude at 260 nm for poly(dG)·poly(dC) (curve a), poly[d(G-C)<SUB>2</SUB>] (curve b), poly[d(A-T)<SUB>2</SUB>] (curve c), and poly(dA)·poly(dT) (curve d) at 20 °C.</P> <P>[DISPLAY OMISSION]</P>
Lee, Kyung-Hun,Han, Sae-Won,Hwang, Pil Gyu,Oh, Do-Youn,Kim, Dong-Wan,Chung, Doo Hyun,Im, Seock-Ah,Kim, Tae-You,Heo, Dae Seog,Bang, Yung-Jue Oxford University Press 2006 Japanese journal of clinical oncology Vol.36 No.6
<P><B>Background:</B> The association of epidermal growth factor receptor (EGFR) mutations with the response to conventional cytotoxic chemotherapeutic agents in non-small-cell lung cancer patients has not been investigated. We retrospectively analyzed the associations between response to chemotherapy and molecular markers associated with gefitinib responsiveness including EGFR mutations.</P><P><B>Methods:</B> EGFR (exons 18, 19 and 21) and K-ras mutations (exon 2) were studied by direct sequencing and p-Erk and p-Akt expressions were studied by immunohistochemistry in archival paraffin embedded tissues. Response rate (RR) and time-to-progression (TTP) of prior chemotherapy by platinum, paclitaxel and gemcitabine were analyzed with respect to the presence of EGFR and K-ras mutations, and p-Erk and p-Akt expressions.</P><P><B>Results:</B> Of 90 patients investigated, 75 received platinums and 45 received paclitaxel as first-line chemotherapy agents. The RRS and TTPS of platinum- and paclitaxel-containing regimens were not affected by EGFR or K-ras mutations, nor by p-Erk or p-Akt expression. Fifty-seven patients received gemcitabine as first- or second-line chemotherapy. RR was not affected by EGFR or K-ras mutations or by p-Akt expression. However, all responders to gemcitabine exhibited (+) p-Erk expression [RR 30.6% for p-Erk (+) versus 0% for p-Erk (−), <I>P</I> = 0.01]. TTP was not affected by EGFR or K-ras mutations or by p-Erk or p-Akt expression.</P><P><B>Conclusions:</B> EGFR mutations did not affect response to conventional chemotherapeutic agents, namely platinums, paclitaxel and gemcitabine. Our results also suggest that it may be undesirable to use gemcitabine in patients with tumors not expressing p-Erk.</P>
Growth Performance and Field Evaluation of Herbicide-Resistant Transgenic Creeping Bentgrass
Lee, Ki-Won,Lee, Byung-Hyun,Seo, Bo-Ram,Kim, Jin-Seog,Lee, Sang-Hoon The Korean Society of Grassland and Forage Science 2013 한국초지조사료학회지 Vol.33 No.3
This study examined the growth performance and field evaluation of the dual herbicide-resistant transgenic creeping bentgrass plants. The effect of glyphosate treatment on the herbicide resistance of the transgenic creeping bentgrass plants was determined, and the non-transgenic control plant withered at the concentration $11{\mu}g/mL$ or higher whereas the transgenic creeping bentgrass plants survived the treatment at the concentration of $3,000{\mu}g/mL$, and the increase of the plant length was repressed as the glyphosate treatment concentration was increased. At field evaluation, glufosinate-ammonium and glyphosate were simultaneously treated to investigate the weed control effect. The results showed that more than 90% of the weeds withered four week after herbicide treatment, while the transgenic creeping bentgrass plants continued to grow normally. Therefore, the dual herbicide-resistant creeping bentgrass plants may be able to greatly contribute to the efficiency of weed control and to the economic feasibility of mowing in places such as golf courses.