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1,042 results on '"Kim, Dong‐Pyo"'

202. Simultaneous Monitoring of Temperature and Ca2+Concentration Variation by Fluorescent Polymer during Intracellular Heat Production

Author

Qiao, Juan, Hwang, Yoon-Ho, Kim, Dong-Pyo, and Qi, Li

Abstract

The relationship between calcium ion (Ca2+) concentration and temperature variation during the oxidative phosphorylation (OXPHOS) process has become an essential focus for exploration of signaling pathways and neurodegenerative disease. However, there have been limited reports of fluorescent probes for simultaneous Ca2+detection and temperature sensing. Herein, a new water-soluble fluorescent probe that combines a thermoresponsive polymer, curcumin and Fluo-4 AM for intracelllar temperature and Ca2+sensing is described. Furthermore, this fluorescent polymer was successfully applied for intracelluar temperature and Ca2+gradient monitoring generated by exogenous heating in HeLa cells. It was discovered that within 10 min after the OXPHOS process was induced by an inhibitor, the temperature increased 0.5–1.0 °C and the Ca2+level decreased by about 5.7 μM. These results confirmed that the fluorescent polymer enabled investigation of the relationship between intracelluar temperature and Ca2+–induced neurotransmitter release.

Published
2020
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203. Influence of oxidation temperature on the gas permeation and separation properties in a microporous carbon membrane

Author

Kim Dong Pyo, Hong-Joo Lee, Kenji Haraya, and Hiroyuki Suda

Subjects
chemistry.chemical_classification, Carbonization, Chemistry, General Chemical Engineering, chemistry.chemical_element, Thermosetting polymer, General Chemistry, Microporous material, Polymer, Permeation, Catalysis, Membrane, Chemical engineering, Organic chemistry, Carbon
Abstract

Of thermosetting polymers, polyphenylene oxide (PPO) is considered as one of the promising alternative polymeric precursors for carbon membrane preparation. In this study, the PPO derived carbon membranes were prepared by carbonization and followed by air-oxidation as post-treatment method to modify the membrane pore structures. The characterization of the pore properties showed that air-oxidation enlarged the pore structure for the postoxidized carbon materials. The permeation results for the post-oxidized carbon membranes showed that the extent of the permeation modification was strongly dependent on the oxidation temperature. In the binary mixture gas systems, the permeation performance of the adsorbing gas species increased due to the surface diffusion mechanism. It is considered in the oxidation effect on the permeation modification that the post-oxidation of the carbon membranes increased gas permeation and separation properties.

Published
2006

204. Preparation and characterization of 3-dimensionally ordered macroporous SiC

Author

LI Xiao-Dong, Kim Dong-Pyo, YU Fu-cheng, and Wang Hao

Subjects
Pore size, Template, Materials science, Chemical engineering, visual_art, visual_art.visual_art_medium, Ceramic, Microporous material, Mesoporous material, Pyrolysis, BET theory, Characterization (materials science)
Abstract

Three-dimensionally (3D) long range ordered macroporous SiC ceramics were prepared through infiltrating polymethylsilane (PMS) into the 3D ordered sacrificial silica template, pyrolysis and the template removal. It was found that the pore size (84–658 nm), BET surface area (299.44–584.64 m2/g) and micropore volume (0.25–0.64 cm3/g) of the achieved porous SiC can be tailored by utilizing different sizes silica sphere templates. There exist three kinds of pores in the porous ceramics: sphere inversed pores, windows and mesopores (2–5 nm). The sphere inversed pores were packed as hcp structure and three dimensionally penetrated through the windows, and the mesopores endowed the porous ceramics surprising high BET surface areas and micropore volumes.

Published
2006

206. Continuous‐Flow Visible Light Organophotocatalysis for Direct Arylation of 2H‐Indazoles: Fast Access to Drug Molecules.

Author

Vidyacharan, Shinde, Ramanjaneyulu, Bandaru T., Jang, Seungwook, and Kim, Dong‐Pyo

Subjects
VISIBLE spectra, DRUG accessibility, ARYLATION, MOLECULES, DRUG solubility
Abstract

A continuous‐flow homogeneous photocatalytic method has been devised for the direct arylation of 2H‐indazoles. This visible‐light‐promoted approach directly accesses a wide range of structurally diverse C3‐arylated scaffolds of biological interest in a fast (1 min), single‐step reaction by using eosin Y as an organophotocatalyst. Furthermore, a microreactor technology is also employed for the fast synthesis of liver X receptor inhibitor drugs with very good yields under metal‐free conditions, whereas the reported methods required multiple steps and much longer reaction times (18–24 h). [ABSTRACT FROM AUTHOR]

Published
2019
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207. Etching Characteristics of Au Thin Films using Inductively Coupled CF4/ Cl2/ Ar Plasma

Author

Kim Chang-Il and Kim Dong-Pyo

Subjects
Materials science, fungi, technology, industry, and agriculture, Analytical chemistry, Substrate (electronics), Plasma, Electronic, Optical and Magnetic Materials, Chamber pressure, X-ray photoelectron spectroscopy, Etching (microfabrication), Melting point, Electrical and Electronic Engineering, Inductively coupled plasma, Thin film
Abstract

The etching of Au thin films has been performed in an inductively coupled plasma. The etch properties including etch rate and selectivity were examined as content adds from o to to plasma. The gas mixing ratio was fixed at . Other parameters were fixed at an rf power of 700 W, a dc bias voltage of -150 V, a chamber pressure of 15 mTorr, and a substrate temperature of . The highest etch rate of the Au thin film was 370 nm/min at a additive into gas mixture. The surface reaction of the etched Au thin films was investigated using x-ray photoelectron spectroscopy (XPS) analysis. The XPS analysis shows that the intensities of Ail peaks are changed, indicating that there is a chemical reaction between Cl and Au. Au-Cl is hard to remove on the surface because of its high melting point. However, etching products can be sputtered by Ar ion bombardment.

Published
2003

223. Nano-photocatalysts in microfluidics, energy conversion and environmental applications

Author

Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Parmar, Jemish, Jang, Seungwook, Soler Turu, Lluís, Kim, Dong-Pyo, Sanchez, Samuel, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Parmar, Jemish, Jang, Seungwook, Soler Turu, Lluís, Kim, Dong-Pyo, and Sanchez, Samuel

Abstract

Extensive studies have been carried out on photocatalytic materials in recent years as photocatalytic reactions offer a promising solution for solar energy conversion and environmental remediation. Currently available commercial photocatalysts still lack efficiency and thus are economically not viable for replacing traditional sources of energy. This article focuses on recent developments in novel nano-photocatalyst materials to enhance photocatalytic activity. Recent reports on optofluidic systems, new synthesis of photocatalytic composite materials and motile photocatalysts are discussed in this article., Postprint (published version)

Published
2015

228. Control of tandem isomerizations: flow-assisted reactions of o-lithiated aryl benzyl ethers.

Author

Lee, Hyune-Jea, Kim, Heejin, Yoshida, Jun-Ichi, and Kim, Dong-Pyo

Subjects
ISOMERIZATION kinetics, BENZYL ethers, MICROREACTORS, FAVORSKII rearrangement, MICROFLUIDICS
Abstract

Tandem chemical changes are often difficult to control at will, because they proceed rapidly through multiple unstable reactive intermediates. It is desirable to develop a novel method for controlling such tandem changes to obtain desired products with high selectivity. Herein, we report a flow microreactor platform for controlling tandem isomerizations of o-lithiated aryl benzyl ethers based on precise residence time control. [ABSTRACT FROM AUTHOR]

Published
2018
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