14 Result(s)
within
Yun-** Lim
Materials Science
Characterization and Evaluation of Materials
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Article
Strengthening Effect of Decreased Dislocation Density After Annealing in Pure Aluminum or Copper
Plastic deformation in metals occurs through the generation and movement of dislocations, leading to strain hardening. The dislocation density has long been known as a measure of work hardening in metals and a...
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Article
Pore characteristics of Lotus-Type Porous Copper Fabricated by Centrifugal Casting
Lotus-type porous copper was fabricated by a centrifugal casting. The long cylindrical pores aligned along single direction was formed during unidirectional solidification in a hydrogen atmosphere under a cent...
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Article
Ultrasonically prepared polystyrene/multi-walled carbon nanotube nanocomposites
Polystyrene (PS) and multi-walled carbon nanotube (MWNT) nanocomposites were synthesized via an in situ bulk polymerization by employing an ultrasonicator without adding an initiator, in which the ultrasonicat...
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Article
Preparation and electric characterization of single phase La0.8Sr0.2Ga0.8Mg0.2O3 and La0.8Sr0.2Ga0.8Mg0.115Co0.085O3 thin films
La0.8Sr0.2Ga0.8Mg0.2O3 (LSGM) and La0.8Sr0.2Ga0.8Mg0.115Co0.085O3 (LSGMC) thin films were deposited on single crystalline (001) Al2O3 substrates using a pulsed laser deposition technique. The LSGM and LSGMC thin ...
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Article
Effect of metal chloride solutions on coloration and biaxial flexural strength of yttria-stabilized zirconia
The effect of three kinds of transition metal dopants on the color and biaxial flexural strength of zirconia ceramics for dental applications was evaluated. Presintered zirconia discs were colored through imme...
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Article
Effects of temperature and catalysts on the synthesis of carbon nanotubes by chemical vapor deposition
Carbon nanotubes were produced on a quartz plate and a silicon wafer by chemical vapor deposition using xylene as a carbon resource, iron and cobalt as catalysts, and ammonia as a reactive gas. A series of exp...
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Article
Carbon nanotubes grown over Fe−Mo−Mg−O composite catalysts
High quality, high yield carbon nanotubes were synthesized on a composite catalyst using catalytic chemical vapor deposition. The composite catalysts Fe/MgO, Mo/MgO and (Fe, Mo)/ MgO, prepared via the solgel m...
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Article
Effects of ammonia in catalytic chemical vapor deposition in the synthesis of carbon nanotubes
Chemical vapor deposition with xylene as the carbon resource, a nitrate iron solution as the catalyst, and ammonia gas as the reduction gas was used to investigate the different parameters that influence carbo...
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Article
Bonding of urethane reactants to aluminum surface
Reaction mechanism of urethane components (phenyl isocyanate and isopropanol) on Al hydroxide surface was studied using molecular modeling, and compared with real systems by measurement of electrochemical pote...
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Article
Effects of filler and ethanol on mechanical properties of glass-like carbon
The effects of filler and ethanol on the mechanical properties of glass-like carbon were studied. The specific gravities of glass-like carbons with the filler were higher than those of alcohol added glass-like...
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Article
Effect of gas feeding methods on optical properties of GaN grown by rapid thermal chemical vapor deposition reactor
The origin of the radiative recombination leading to yellow luminescence (YL) has been elucidated by the study of luminescence properties of GaN films grown with two different gas feeding methods. GaN films we...
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Article
A study on the development of engineering plastic piston used in the shock absorber
A piston is an important component of the shock absorber which determines comfortable riding and handling. Conventional piston is made of metal powder that is pressed in a mold, and then sintered at high tempe...
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Article
Study on the Diamond Field Emitter Fabricated by Transfer Mold Technique
Strip-shaped diamond-tip field emitter array was fabricated by using the transfer mold technique. The sharp turn-on characteristic was observed from the current-voltage measurement of the fabricated diamond-ti...
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Article
Enhanced mesophase formation of petroleum pitch by polyaromatic hydrocarbon addition
Enhanced mesophase yield was achieved for A-240 pitch by addition of aromatic hydrocarbon compounds (anthracene and acenaphthylene) as nucleating agents. A-240 pitch was acid/solvent extracted prior to adding ...
