• Carbon letters
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• v.25
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• pp.78-83
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• 2018

Pyrolyzed fuel oil (PFO) and coal tar was blended in the feedstock to produce pitch via thermal reaction. The blended feedstock and produced pitch were characterized to investigate the effect of the blending ratio. In the feedstock analysis, coal tar exhibited a distinct distribution in its boiling point related to the number of aromatic rings and showed higher Conradson carbon residue and aromaticity values of 26.6% and 0.67%, respectively, compared with PFO. The pitch yield changed with the blending ratio, while the softening point of the produced pitch was determined by the PFO ratio in the blends. On the other hand, the carbon yield increased with increasing coal tar ratio in the blends. This phenomenon indicated that the formation of aliphatic bridges in PFO may occur during the thermal reaction, resulting in an increased softening point. In addition, it was confirmed that the molecular weight distribution of the produced pitch was associated with the predominant feedstock in the blend.

• Korean Chemical Engineering Research
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• v.49 no.2
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• pp.151-154
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• 2011

Catalytic activity such as conversion and selectivity on the phenol hydroxylation over TS-1 prepared by hydrothermal method and microwave heating method, respectively, was compared and discussed for understanding the dependence of solvent such as water, methanol, acetone, respectively, during phenol hydroxylation, with hydrogen peroxide. Basic physical properties such as XRD, EDS, SEM and $N_{2}$ adsorption/desorption were determined and compared. The relationship between catalytic activity and physical properties of TS-1 was explained.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.39 no.4
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• pp.38-44
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• 2007

In order to utilize unsorted ONP, which contains leaflets (printed coated papers), to produce pulp mold, optimum conditions for a repulping process were investigated with a laboratory high consistency pulper. It was concluded that medium or high consistency pulping is necessary to accelerate the rate of deflaking of unsorted ONP. Considering flake content, fines content and pulping energy, the optimum conditions for the laboratory Helico pulper were 11% of repulping concentration and 3 min of repulping time. The repulping temperature shall be at least $30^{\circ}C$. Aging of paper slows down the rate of de flaking but in an actual pulp molding process its effect could be negligible.

• Toxicological Research
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• v.20 no.4
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• pp.381-389
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• 2004

The toxicity of CKD-602 was investigated at doses of 3, 9, and 27 mg/kg in rats, when the same total dose of CKD-602 was administered over 24 hr-continuous infusion or bolus injection. At 3 and 9 mg/kg, the 24-hr infusion group showed a more decreased WBC count on day 3, compared with the bolus group. Administration of CKD-602 caused more toxic effects such as the significant decreases of RBC counts, hematocrit, hemoglobin, and platelet count on day 7 post-administarion in the 24-hr infusion group than in the bolus group. Administration of CKD-602 also caused histopathological changes such as extramedullary hemopoiesis of liver and spleen, hyperplasia of femoral bone marrow, and caecal dilation. These toxic effects were more severe in the 24-hr infusion group than in the bolus injection group, indicating that the toxicity of CKD-602 may be dependant upon the duration of administration.

• Bulletin of the Korean Chemical Society
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• v.31 no.6
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• pp.1489-1495
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• 2010

A porous coordination solid of nickel(II) dihydroxyterephthalate has been synthesized by the microwave-assisted (MW) method. The synthesized nickel(II) dihyroxylterephthalate was designated by the general formula of [$Ni_2$(dhtp) $(H_2O)_2]{\cdot}8H_2O$ (where, dhtp = 2,5-dihydroxyterephthalate, denoted by Ni-DHTP). The effect of microwave-irradiation temperature and time of irradiation on the porosity and morphological changes in the solids have also been investigated. The catalytic performance of Ni-DHTP synthesized by MW method has been studied in the oxidation of cyclohexene with aqueous $H_2O_2$, which gave cyclohexene oxide as the primary product and 2-cyclohexene-1-ol as a major product.

• Bulletin of the Korean Chemical Society
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• v.33 no.9
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• pp.3133-3135
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• 2012

• Bulletin of the Korean Chemical Society
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• v.27 no.5
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• pp.789-792
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• 2006

• Proceedings of the Korea Environmental Mutagen Society Conference
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• 2003.10a
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• pp.116-116
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• 2003

• Polymer Science and Technology
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• v.18 no.3
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• pp.238-245
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• 2007

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08b
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• pp.1590-1592
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• 2007

In this study, we prepared CNF (carbon nanofiber) by the solvothermal method for FED (field emission display) applications. We controlled several conditions to synthesize effective CNF for field emission applications. Nano-sizesd Pt nanoparticles were coated on the CNF. In this study, we have applied Pt nanoparticles- coated CNF which can be produced in mass, to field emission application.