Search

Your search keyword '"Lee, Yu Ri"' showing total 61 results
Start Over Author "Lee, Yu Ri" Publisher elsevier bv
61 results on '"Lee, Yu Ri"'

4. VEGFA mRNA-LNP promotes biliary epithelial cell-to-hepatocyte conversion in acute and chronic liver diseases and reverses steatosis and fibrosis

Author

Rizvi, Fatima, primary, Lee, Yu-Ri, additional, Diaz-Aragon, Ricardo, additional, Bawa, Pushpinder S., additional, So, Juhoon, additional, Florentino, Rodrigo M., additional, Wu, Susan, additional, Sarjoo, Arianna, additional, Truong, Emily, additional, Smith, Anna R., additional, Wang, Feiya, additional, Everton, Elissa, additional, Ostrowska, Alina, additional, Jung, Kyounghwa, additional, Tam, Ying, additional, Muramatsu, Hiromi, additional, Pardi, Norbert, additional, Weissman, Drew, additional, Soto-Gutierrez, Alejandro, additional, Shin, Donghun, additional, and Gouon-Evans, Valerie, additional

Published
2023
Full Text
View/download PDF

7. Loop-seal flow characteristics of a circulating fluidized bed for 3 MWth scale chemical looping combustion system

Author

Kim, Daewook, primary, Won, Yooseob, additional, Hwang, Byung Wook, additional, Kim, Jae Young, additional, Kim, Hana, additional, Choi, Yujin, additional, Lee, Yu-Ri, additional, Lee, Seung-Yong, additional, Jo, Sung-Ho, additional, Park, Young Cheol, additional, Baek, Jeom-In, additional, Nam, Hyungseok, additional, Lee, Doyeon, additional, Ryu, Ho-Jung, additional, and Choi, Jeong-Hoo, additional

Published
2023
Full Text
View/download PDF

11. Development of high-performance adsorbent using KOH-impregnated rice husk-based activated carbon for indoor CO2 adsorption

Author

Wang, Shuang, primary, Lee, Yu-Ri, additional, Won, Yooseob, additional, Kim, Hana, additional, Jeong, Se-Eun, additional, Wook Hwang, Byung, additional, Ra Cho, A., additional, Kim, Jae-Young, additional, Cheol Park, Young, additional, Nam, Hyungseok, additional, Lee, Dong-Ho, additional, Kim, Hyunuk, additional, and Jo, Sung-Ho, additional

Published
2022
Full Text
View/download PDF

13. Dual-functionalized ZIF-8 as an efficient acid-base bifunctional catalyst for the one-pot tandem reaction

Author

Kyung Youl Baek, Lee Yu Ri, Xuan Huy Do, and Seung Sang Hwang

Subjects
chemistry.chemical_classification, 02 engineering and technology, General Chemistry, Sulfonic acid, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensation reaction, Heterogeneous catalysis, 01 natural sciences, Catalysis, 0104 chemical sciences, Bifunctional catalyst, chemistry.chemical_compound, chemistry, Polymer chemistry, Knoevenagel condensation, 0210 nano-technology, Bifunctional, Zeolitic imidazolate framework
Abstract

An acid-base bifunctional zeolitic imidazolate framework catalyst (ZIF8-A61-SO3H) with amine and sulfonic acid groups was successfully prepared through simple two step post-synthetic modification: preparation of amine-functionalized ZIF-8 with amine contents of 61% (ZIF8-A61) by the ligand exchange of 2-mIM with 3-amino-1,2,4-triazole (Atz), followed by the sulfonic acid functionalization by the ring-opening reaction of 1,3-propanesultone with –NH2 groups in ZIF8-A61. Amine-functionalized ZIF8-A materials with difference amine contents (15%, 34%, and 61%, respectively) were also prepared by controlling the synthesis time. All obtained ZIF catalysts evaluated as a heterogeneous catalyst for one-pot deacetalization-Knoevenagel condensation tandem reaction. Compared with ZIF-8 and amine-functionalized ZIF-8 catalysts, ZIF8-A61-SO3H catalyst showed good catalytic performance with 100% conversion of the reactant and 98% selectivity of the final Knoevenagel product. An enhanced catalytic activity can be attributed to the co-existence of site-isolated acid-base groups on the ZIF8-A61-SO3H catalyst in close proximity. The heterogeneous nature of the catalytic system was confirmed by a hot-filtering test and the catalyst also exhibited reusable in the five repeated cycles. A plausible catalytic mechanism of deacetalization-Knoevenagel condensation reaction over ZIF8-A61-SO3H was also proposed.

Published
2021

20. Development of diarylpentadienone analogues as alpha-glucosidase inhibitor: Synthesis, in vitro biological and in vivo toxicity evaluations, and molecular docking analysis

Author

Abdullah, Maryam Aisyah, primary, Lee, Yu-Ri, additional, Mastuki, Siti Nurulhuda, additional, Leong, Sze Wei, additional, Wan Ibrahim, Wan Norhamidah, additional, Mohammad Latif, Muhammad Alif, additional, Ramli, Aizi Nor Mazila, additional, Mohd Aluwi, Mohd Fadhlizil Fasihi, additional, Mohd Faudzi, Siti Munirah, additional, and Kim, Cheol-Hee, additional

Published
2020
Full Text
View/download PDF

24. Sonochemical synthesis of Zr-based porphyrinic MOF-525 and MOF-545: Enhancement in catalytic and adsorption properties

Author

Wha-Seung Ahn, Jin Young Seo, Lee Yu Ri, Kwangsun Yu, Kyung Youl Baek, and Young-Min Chung

Subjects
Thermogravimetric analysis, Materials science, fungi, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Porphyrin, 0104 chemical sciences, Catalysis, chemistry.chemical_compound, Adsorption, chemistry, Mechanics of Materials, Zirconyl chloride, Trifluoroacetic acid, General Materials Science, Inductively coupled plasma, 0210 nano-technology, Nuclear chemistry, Benzoic acid
Abstract

The synthesis of metal-organic frameworks (MOFs) with in-built porphyrin units remains challenging. It takes long synthesis time under carefully controlled reaction conditions, and a mixed-phase with different crystal morphologies is still frequently observed. In this work, Zr-based porphyrinic MOF-525 and MOF-545 in high purity and uniform size were produced through a sonochemical route in 2.5 and 0.5 h, respectively, using zirconyl chloride octahydrate and tetrakis (4-carboxyphenyl) porphyrin. Benzoic acid was used as a modulator for MOF-525, and trifluoroacetic acid for MOF-545. The physicochemical properties of the MOF products were examined by X-ray diffraction, scanning electron microscopy, and N2 adsorption-desorption isotherms. Additionally, the defect sites in the MOF samples were analyzed by UV–vis spectrometry, thermogravimetric analysis, and inductively coupled plasma mass spectrometer. The sonochemically synthesized MOF samples had more defect sites than the conventionally prepared ones and exhibited improved textural properties. In particular, the MOF-545 had a significantly smaller (ca. 1.0 μm) particle size than the conventionally prepared sample (ca. 4.8 μm). The MOF-525 and MOF-545 prepared by the sonochemical route exhibited enhanced hydrolysis of the chemical warfare simulant dimethyl-4-nitrophenyl phosphate (DMNP) and a faster and higher bisphenol-A adsorption than the conventionally prepared MOF samples.

Published
2021

27. Zebrafish as a screening model for testing the permeability of blood-brain barrier to small molecules

Author

Kim, Seong Soon, primary, Im, So Hee, additional, Yang, Jung Yoon, additional, Lee, Yu-Ri, additional, Kim, Geum Ran, additional, Chae, Jin Sil, additional, Shin, Dae-Seop, additional, Song, Jin Sook, additional, Ahn, Sunjoo, additional, Lee, Hoi, additional, Woo, Jae Chun, additional, Ahn, Jin Hee, additional, Yun, Chang Soo, additional, Kim, Phiho, additional, Kim, Hyoung Rae, additional, Lee, Kyeong-Ryoon, additional, and Bae, Myung Ae, additional

Published
2019
Full Text
View/download PDF

31. Fabrication of thin-film gadolinia-doped ceria (GDC) interdiffusion barrier layers for intermediate-temperature solid oxide fuel cells (IT-SOFCs) by chemical solution deposition (CSD)

Author

Jong-Ho Lee, Sun-Young Park, Hae-Weon Lee, Eun-Ok Oh, Ji-Won Son, Kyung Joong Yoon, Lee Yu Ri, Dasari Hari Prasad, Chin-Myung Whang, and Byung-Kook Kim

Subjects
Materials science, Process Chemistry and Technology, Oxide, Nanotechnology, Substrate (electronics), Electrolyte, Cathode, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, law.invention, Anode, Barrier layer, chemistry.chemical_compound, Chemical engineering, chemistry, law, Materials Chemistry, Ceramics and Composites, Chemical stability, Thin film
Abstract

A dense gadolinia-doped ceria (GDC) interdiffusion barrier layer as thin as 300 nm was successfully fabricated on a rigid anode/electrolyte bilayer substrate using the chemical solution deposition (CSD) process for intermediate temperature solid oxide fuel cells (SOFCs). Drying-related macro-defects were removed by employing drying control chemical additives (DCCA), which effectively relieved drying stresses. The major process flaws caused by the constraining effects of the rigid substrate were completely eliminated by the addition of GDC nanoparticles into the chemical solution, which suppressed the generation of microstructural anisotropy by mitigating the predominant bi-axial substrate constraints. As a consequence, a thin film GDC interlayer was successfully deposited with a high volumetric density, effectively preventing the chemical interaction between the electrolyte and cathode during the fabrication process and subsequent operation. The cell test and microstructural analysis confirmed excellent electrochemical performance and structural and chemical stability. The CSD process presented in this paper is considered to be a promising technology for the practical preparation of GDC thin film barrier layers for intermediate temperature SOFCs based on the film quality, processing costs and potential for large-scale production.

Published
2014

32. Effect of Pt introduced on Ru-based electrocatalyst for oxygen evolution activity and stability

Author

Hyung Suk Oh, Yun Jeong Hwang, Lee Yu Ri, Woong Lee, Chang Hyuck Choi, Jaekyung Yi, Kyung Su Park, and Byoung Koun Min

Subjects
Reaction mechanism, Chemistry, Inorganic chemistry, Oxygen evolution, 02 engineering and technology, Thermal treatment, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrocatalyst, 01 natural sciences, 0104 chemical sciences, Catalysis, lcsh:Chemistry, lcsh:Industrial electrochemistry, lcsh:QD1-999, Oxidation state, Electrochemistry, Water splitting, 0210 nano-technology, Dissolution, lcsh:TP250-261
Abstract

Ru-based electrocatalysts are generally known to be suitable for the oxygen evolution reaction (OER), but they have intrinsic problems in balancing catalytic activity and stability. In this study, we took the strategy, introducing Pt atoms into the structure of crystalline RuO2 to enhance the catalytic property toward OER while maintaining durability. The OER activity of Ru0.9Pt0.1O2/C with high stability was significantly higher than that of RuO2/C. In situ/operando ICP-MS analysis showed that Ru dissolution of Ru0.9Pt0.1O2/C during OER was suppressed by introducing Pt and thermal treatment when compared to Ru/C. The XPS results after OER measurement indicated that the Ru oxidation state of Ru0.9Pt0.1O2/C was higher than that of RuO2, which led to high OER catalytic activity. Based on these results, we hypothesize that the enhanced OER activity of Ru0.9Pt0.1O2/C was due to the change in the reaction mechanism from “adsorbate evolution” to “lattice participation”. Our findings increase the possibility of significantly overcoming the activity and stability limits of Ru-based electrocatalysts for the OER using Pt. Keywords: Water splitting, Oxygen evolution reaction, Ruthenium‑platinum oxide, in situ/operando ICP-MS, Lattice participation mechanism

Published
2019

40. Thin film yttria-stabilized zirconia electrolyte for intermediate-temperature solid oxide fuel cells (IT-SOFCs) by chemical solution deposition

Author

Jong Heun Lee, Lee Yu Ri, Jong-Ho Lee, Chin Myung Whang, Kyung Joong Yoon, Ji-Won Son, Eun Ok Oh, Byung-Kook Kim, and Hae Weon Lee

Subjects
Spin coating, Materials science, Oxide, Electrolyte, Anode, Pulsed laser deposition, chemistry.chemical_compound, chemistry, Materials Chemistry, Ceramics and Composites, Solid oxide fuel cell, Thin film, Composite material, Yttria-stabilized zirconia
Abstract

A 500 nm thick thin film YSZ (yttria-stabilized zirconia) electrolyte was successfully fabricated on a conventionally processed anode substrate by spin coating of chemical solution containing slow-sintering YSZ nanoparticles with the particle size of 20 nm and subsequent sintering at 1100 °C. Incorporation of YSZ nanoparticles was effective for suppressing the differential densification of ultrafine precursor powder by mitigating the prevailing bi-axial constraining stress of the rigid substrate with numerous local multi-axial stress fields around them. In particular, adding 5 vol% YSZ nanoparticles resulted in a dense and uniform thin film electrolyte with narrow grain size distribution, and fine residual pores in isolated state. The thin film YSZ electrolyte placed on a rigid anode substrate with the GDC (gadolinia-doped ceria) and LSC (La0.6Sr0.4CoO3−δ) layers deposited by PLD (pulsed laser deposition) processes revealed that it had fairly good gas tightness relevant to a SOFC (solid oxide fuel cell) electrolyte and maintained its structural integrity during fabrication and operation processes. In fact, the open circuit voltage was 1.07 V and maximum power density was 425 mW/cm2 at 600 °C, which demonstrates that the chemical solution route can be a viable means for reducing electrolyte thickness for low- to intermediate-temperature SOFCs.

Published
2012

Catalog

Books, media, physical & digital resources
See catalog results