20 Result(s)
within
Joon-Hyung **
Chemistry
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Article
Electrochemically Activated Histidine-Tagged Flavoenzyme-Mediated Biopseudocapacitor
Polypeptides or enzyme proteins have specific functions depending on their unique three-dimensional structures. Active-site histidine or histidine tags in an enzyme protein can be used to fix an electrochemica...
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Synergistic effect of photoanode and photocathode modified with oxygenated multi-walled carbon nanotubes in dye-sensitized solar cells
Oxygenated multi-walled carbon nanotubes (OMWNTs) were employed as additives in conventional TiO2-based photoanodes and platinum-free conducting polymer-based photocathodes. The OMWNTs were induced to form covale...
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Label-free Electrochemical Detection of the Human Adenovirus 40/41 Fiber Gene
A nanoporous silicon-based label-free DNA biosensor was fabricated to monitor rapidly enteric adenovirus types 40 and 41, a leading cause of viral gastroenteritis in children. Nanoporous silicon (NPS) was form...
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Improvement of thermal regeneration of spent granular activated carbon using air agent : Application of sintering and deoxygenation
Thermal regeneration of spent granular activated carbon (GAC) using sintering, air-activation, and deoxygenation was investigated to determine the potential of this method for overcoming the drawbacks of therm...
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Article
Liquid crystal-based biosensors using a strong polyelectrolyte-containing block copolymer, poly(4-cyanobiphenyl-4′-oxyundecylacrylate)-b-poly(sodium styrene sulfonate)
The interface between a nematic liquid crystal phase, 4-cyano-4′-pentylbiphenyl (5CB) and water was examined for protein detection by monitoring the formation of a complex between sodium polystyrene sulfonate ...
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Surface activation of plasma-patterned carbon nanotube based DNA sensing electrodes
We have studied the effect of treatment of multiwalled carbon nanotubes (MWCNTs) for use in DNA-based biosensors with oxygen plasma. Well-patterned MWCNT electrodes were photolithographically fabricated on gla...
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Influence of GMA grafted MWNTs on physical and rheological properties of PMMA-based nanocomposites by in situ polymerization
In this study, multi-walled carbon nanotubes (MWNTs) reinforced poly (methyl methacrylate) (PMMA) nanocomposites were prepared by in situ polymerization. Glycidyl methacrylate (GMA) grafted MWNTs (GMA-MWNTs) were...
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Article
Synthesis and characterization of chemically modified polystyrene as processable carbon fiber precursors
In this study, the chemically modified polystyrene was studied for improvement of polystyrene which had low carbon yield, as a carbon fiber precursor. The polystyrene was synthesized with divinylbenzene which ...
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Fabrication and electroanalytical characterization of label-free DNA sensor based on direct electropolymerization of pyrrole on p-type porous silicon substrates
Label-free DNA sensors based on porous silicon (PS) substrate were fabricated and electrochemically characterized. p-type silicon wafer was electrochemically anodized in an ethanolic hydrofluoric (HF) solution...
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Article
Integrated urea sensor module based on poly(3-methylthiophene)-modified p-type porous silicon substrate
Integrated three-electrode system module composed of a porous silicon (PS)-based sensing electrode, an Ag/AgCl thin film reference electrode (REtf), and a Pt thin film counter electrode (CE) was fabricated for mo...
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Article
Immobilization of molten salt waste into MZr2(PO4)3 (M=Li, Na, Cs, Sr)
Amorphous zirconium phosphate (Zr(HPO4)2.nH2O, AM-ZP) has been investigated as a material for selective removal of Cs or Sr from molten salt waste at aqueous state and its ceramic waste form. NZP (MZr2P3O12, M=Li...
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Article
Microstructure evolution and dielectric properties of Ba5-xNa2xNb10O30 ceramics with different Ba–Na Ratios
The tetragonal tungsten bronzes of Ba5−xNa2x Nb10O30 (BNN, 0.5≤ x≤1.3) ceramics were synthesized using the solid state reaction method. The sintering behavior and dielectric characteristics of the...
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Article
Axial gas phase dispersion in a molten salt oxidation reactor
Gas phase axial dispersion characteristics were determined in a molten salt oxidation reactor (air-molten sodium carbonate salt two phase system). The effects of the gas velocity (0.05–0.22 m/s) and molten sal...
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Article
Effectiveness and mechanisms of high-temperature lead capture by various Aluminum-Silicate minerals
The relative effectiveness of seven inorganic sorbents for the capture of gaseous lead chloride was investigated by using a high-temperature packed bed sorption reactor. The investigated sorbents were alumina,...
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Leaching of glass components and surrogate nuclides from glassy waste forms for radioactive incineration ash
The applicability of vitrification technology to treat radioactive incineration ash was studied, especially in terms of leaching characteristics, by using several glassy waste forms which are fabricated with s...
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Article
Adsorption Equilibrium and Dynamics of Methyl Iodide in a Silver Ion-Exchanged Zeolite Column at High Temperatures
An extensive evaluation was carried out to determine the optimal silver ion-exchanged level for the removal of methyl iodide at high temperatures up to 400°C. Based on the degree of silver utilization, the opt...
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Mechanisms and kinetics of cadmium and lead capture by calcined kaolin at high temperatures
One of the most promising technologies for reducing volatile metal emissions from the waste incineration process is the high-temperature capture of vapor-phase metals before their condensing into fine particle...
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Article
Capture of volatile hazardous metals using a bed of kaolinite
One of the promising technologies for reducing metals emission from the waste thermal process is the capture of vapor-phase metals through the use of solid sorbents. This study investigated the use of natural ...
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Gas-phase resistance to the vaporization of mercuric halides in high-temperature atmospheric gaseous condition
Gas-phase resistances to the vaporization of three mercury halides into atmosphere at elevated temperatures were evaluated. Lab-scale vaporization experiments for mercuric bromide, mercuric iodide and mercuric...
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Vaporization characteristics of heavy metal compounds at elevated temperatures
Volatilities and conversions of heavy metal compounds under oxidation conditions at elevated temperatures up to 1,000°C are analyzed using a thermogravimetric furnace to evaluate their behaviors in an incinera...
