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170 results on '"Cho, Sung‐Ju"'

5. Nitrile Electrolyte Strategy for 4.9 V‐Class Lithium‐Metal Batteries Operating in Flame.

Author

Moon, Hyunseok, Cho, Sung‐Ju, Yu, Dae‐Eun, and Lee, Sang‐Young

Abstract

Challenges facing high‐voltage/high‐capacity cathodes, in addition to the longstanding problems pertinent to lithium (Li)‐metal anodes, should be addressed to develop high‐energy‐density Li‐metal batteries. This issue mostly stems from interfacial instability between electrodes and electrolytes. Conventional carbonate‐ or ether‐based liquid electrolytes suffer from not only volatility and flammability but also limited electrochemical stability window. Here, we report a nitrile electrolyte strategy based on concentrated nitrile electrolytes (CNEs) with co‐additives. The CNE consists of high‐concentration lithium bis(fluorosulfonyl)imide (LiFSI) in a solvent mixture of succinonitrile (SN)/acetonitrile (AN). The SN/AN solvent mixture is designed to ensure high oxidation stability along with thermal stability, which are prerequisites for high‐voltage Li‐metal cells. The CNE exhibits interfacial stability with Li metals due to the coordinated solvation structure. Lithium nitrate (LiNO3) and indium fluoride (InF3) are incorporated in the CNE as synergistic co‐additives to further stabilize solid‐electrolyte interphase (SEI) on Li metals. The resulting electrolyte (CNE + LiNO3/InF3) enables stable cycling performance in Li||LiNi0.8Co0.1Mn0.1 and 4.9 V‐class Li||LiNi0.5Mn1.5O4 cells. Notably, the Li||LiNi0.5Mn1.5O4 cell maintains its electrochemical activity at high temperature (100 °C) and even in flame without fire or explosion. [ABSTRACT FROM AUTHOR]

Published
2023
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8. Liquid‐Based Janus Electrolyte for Sustainable Redox Mediation in Lithium–Oxygen Batteries

Author

Ko, Youngmin, primary, Kim, Hong‐I, additional, Cho, Sung‐Ju, additional, Lee, Kyung Min, additional, Jung, Gwan Yeong, additional, Park, Hyeokjun, additional, Park, Se Hwan, additional, Lee, Yun Jung, additional, Bae, Youngjoon, additional, Lee, Young‐Ro, additional, Kim, Kyoungoh, additional, Kwak, Sang Kyu, additional, Lee, Sang‐Young, additional, and Kang, Kisuk, additional

Published
2021
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12. Liquid‐Based Janus Electrolyte for Sustainable Redox Mediation in Lithium–Oxygen Batteries

Author

Se Hwan Park, Gwan Yeong Jung, Hong-I Kim, Yun Jung Lee, Youngro Lee, Youngjoon Bae, Kyoungoh Kim, Youngmin Ko, Kyung Min Lee, Hyeokjun Park, Sang Young Lee, Kisuk Kang, Sang Kyu Kwak, and Cho Sung-Ju

Subjects
Materials science, Chemical engineering, chemistry, Renewable Energy, Sustainability and the Environment, Mediation, chemistry.chemical_element, Liquid based, General Materials Science, Lithium, Electrolyte, Janus, Redox, Oxygen
Published
2021

17. A versatile approach to the synthesis of (+)-mannostatin A analogues

Author

Cho, Sung Ju, Ling, Rong, Kim, Alexander, and Mariano, Patrick S.

Subjects
Organic compounds -- Synthesis, Anticholesteremic agents -- Research, Natural products -- Research, Stereoisomers -- Analysis, Biological sciences, Chemistry
Abstract

Research describes a versatile pyridinium salt photoelectrocyclization/aziridine ring cleavage sequence methodology for the synthesis of mannostatin analogues, (+)-4-epimannostatin and (+)-mannostatin A regioisomers.

Published
2000

19. A solvent effect that influences the preparative utility of N-(silylakyl)phthalimide and N-(silylakyl)maleimide photochemistry

Author

Yoon, Ung Chan, Oh, Sun Wha, Lee, Soo Min, Cho, Sung Ju, Gamlin, Janet, and Mariano, Patrick S.

Subjects
Excited state chemistry -- Research, Biological sciences, Chemistry
Abstract

The photochemistry of selected N-silylalkyl-substituted phthalimides and maleimides is examined to analyze the generality and preparative consequences of a solvent effect on excited-state reaction chemoselectivities and quantum efficiencies. This solvent effect is observed in the photochemistry of N-((trimethylsilyl)butyl)phthalimide 10 and in the photochemistry of the N-silylpropyl-maleimide. The results show the generality of the solvent effect and how it can be applied to improve the preparative utility of the photochemistry of N-(silylalkyl)phthalimides and N-(silylalkyl)maleimides.

Published
1999

21. Investigations of novel azomethine ylide-forming photoreactions of N-silylmethylimides

Author

Yoon, Ung Chan, Cho, Sung Ju, Lee, Yean-Jang, Mancheno, Maria J., and Mariano, Patrick S.

Subjects
Photochemical research -- Analysis, Chemical reactions -- Observations, Biological sciences, Chemistry
Abstract

The C to O silyl migration occurs in the photochemical reactions of N-trimethylsilylmethyl imides which form azomethine ylide and this pathway is essential for cyclic and acyclic, conjugated silylmethyl imides. The photolysis of N-(trimethylsilyl)methyl maleimide generates the tricyclic product. Azomethine ylide intermediates are formed in the reaction of N-trimethylsilylmethyl aroyl imides where the excited state C to O silyl migration occurs.

Published
1995

32. Quantum dot-induced cell death involves Fas upregulation and lipid peroxidation in human neuroblastoma cells

Author

Lovrić Jasmina, Desbarats Julie, Cho Sung Ju, Choi Angela O, and Maysinger Dusica

Subjects
Biotechnology, TP248.13-248.65, Medical technology, R855-855.5
Abstract

Abstract Background Neuroblastoma, a frequently occurring solid tumour in children, remains a therapeutic challenge as existing imaging tools are inadequate for proper and accurate diagnosis, resulting in treatment failures. Nanoparticles have recently been introduced to the field of cancer research and promise remarkable improvements in diagnostics, targeting and drug delivery. Among these nanoparticles, quantum dots (QDs) are highly appealing due to their manipulatable surfaces, yielding multifunctional QDs applicable in different biological models. The biocompatibility of these QDs, however, remains questionable. Results We show here that QD surface modifications with N-acetylcysteine (NAC) alter QD physical and biological properties. In human neuroblastoma (SH-SY5Y) cells, NAC modified QDs were internalized to a lesser extent and were less cytotoxic than unmodified QDs. Cytotoxicity was correlated with Fas upregulation on the surface of treated cells. Alongside the increased expression of Fas, QD treated cells had increased membrane lipid peroxidation, as measured by the fluorescent BODIPY-C11 dye. Moreover, peroxidized lipids were detected at the mitochondrial level, contributing to the impairment of mitochondrial functions as shown by the MTT reduction assay and imaged with confocal microscopy using the fluorescent JC-1 dye. Conclusion QD core and surface compositions, as well as QD stability, all influence nanoparticle internalization and the consequent cytotoxicity. Cadmium telluride QD-induced toxicity involves the upregulation of the Fas receptor and lipid peroxidation, leading to impaired neuroblastoma cell functions. Further improvements of nanoparticles and our understanding of the underlying mechanisms of QD-toxicity are critical for the development of new nanotherapeutics or diagnostics in nano-oncology.

Published
2007
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35. Climate Change Adaptation via U.S. Land Use Transitions: A Spatial Econometric Analysis

Author

Cho, Sung Ju, McCarl, Bruce A., and Wu, Ximing

Subjects
Land use change, climate change adaptation, spatial econometrics, Environmental Economics and Policy, Land Economics/Use, Q54, Q15, C31
Abstract

Climate change, coupled with biofuels development and other factors may well be changing US land usage patterns. We use a spatial econometric approach to estimate the drivers of US land use transitions in recent years. We consider transitions between six major land uses: agricultural land, forest, grassland, water, urban, and other uses. To examine drivers, we use a two-step linearized, spatial, multinomial logit model and estimate land use transition probabilities. Our results indicate that climate change is a driver of land use change and that movements to and from agricultural land and grassland exhibit opposite responses with climate change portending a movement out of cropland into grassland. These results indicate that adaptation to climate change through land usage change is ongoing but with spatial dependence.

Published
2015

36. Feasibility study on nuclear core design for soluble boron free small modular reactor

Author

Mohamad Hairie Rabir, Chang Joo Hah, and Cho Sung Ju

Subjects
Engineering, business.industry, Nuclear engineering, chemistry.chemical_element, Concentration ratio, Rod, Small modular reactor, Core (optical fiber), Boron concentration, Nuclear reactor core, chemistry, Once through, business, Boron, Nuclear chemistry
Abstract

A feasibility study on nuclear core design of soluble boron free (SBF) core for small size (150MWth) small modular reactor (SMR) was investigated. The purpose of this study was to design a once through cycle SMR core, where it can be used to supply electricity to a remote isolated area. PWR fuel assembly design with 17×17 arrangement, with 264 fuel rods per assembly was adopted as the basis design. The computer code CASMO-3/MASTER was used for the search of SBF core and fuel assembly analysis for SMR design. A low critical boron concentration (CBC) below 200 ppm core with 4.7 years once through cycle length was achieved using 57 fuel assemblies having 170 cm of active height. Core reactivity controlled using mainly 512 number of 4 wt% and 960 12 wt% Gd rods.

Published
2015

38. Climate Change Adaptation and Shifts in Land Use for Major Crops in the U.S

Author

Cho, Sung Ju, McCarl, Bruce A., and Wu, Ximing

Subjects
fungi, Land use, food and beverages, Climate change, sense organs, Environmental Economics and Policy, Land Economics/Use, Fractional regression, Crop mix
Abstract

This study examines how the U.S. crop mix pattern has responded to climate and in turn the potential effects of projected climate change. We find that there are significant effects of temperature and precipitation on the crop choice decisions.

Published
2014
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44. Lithium‐Ion Batteries: Excellent Compatibility of Solvate Ionic Liquids with Sulfide Solid Electrolytes: Toward Favorable Ionic Contacts in Bulk‐Type All‐Solid‐State Lithium‐Ion Batteries (Adv. Energy Mater. 22/2015)

Author

Oh, Dae Yang, primary, Nam, Young Jin, additional, Park, Kern Ho, additional, Jung, Sung Hoo, additional, Cho, Sung‐Ju, additional, Kim, Yun Kyeong, additional, Lee, Young‐Gi, additional, Lee, Sang‐Young, additional, and Jung, Yoon Seok, additional

Published
2015
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