• 공업화학
• /
• 제35권2호
• /
• pp.107-114
• /
• 2024

피치계 활성탄의 수율 향상을 위해 열분해유와 콜타르를 혼합하여 피치를 합성하고, 합성된 피치를 물리적 활성화하여 활성탄을 제조하였다. 피치는 콜타르를 열분해유 대비 0~20%로 달리하여, 380~420 ℃에서 3 h 반응하여 합성하였다. 합성된 피치는 80~260 ℃ 사이의 연화점을 가졌고, 10~40% 범위의 수율을 나타냈다. 모든 합성온도에서 콜타르 혼합비율이 증가할수록 수율이 증가하고, 연화점이 감소함을 확인하였다. 합성된 피치 중 연화점이 230~260 ℃ 사이의 피치를 선정하여 물성을 고찰하였다. 열분해유만으로 제조된 피치에 비해 콜타르가 함유된 피치가 저비점에서 휘발분이 많고, 잔탄량이 높았다. 이는 콜타르와 열분해유의 조성에 따른 차이로, 방향족 성분이 많은 콜타르와 지방족 성분이 많은 열분해유의 영향임을 확인하였다. 선정된 피치를 관형 반응기에서 950 ℃까지 승온하고, 1 h 동안 수증기로 물리적 활성화하였다. 콜타르가 포함된 활성탄이 열분해유만으로 제조된 활성탄에 비해 높은 수율과 미세기공율을 나타냈다. 본 연구에서는 피치 원료 혼합에 의한 활성탄 수율 증가 효과를 확인하고, 콜타르 혼합 비율에 따른 물리적 활성화 특성을 고찰하였다.

• 한국진공학회:학술대회논문집
• /
• 한국진공학회 1998년도 제14회 학술발표회 논문개요집
• /
• pp.141-142
• /
• 1998

• 한국고분자학회지:고분자과학과기술
• /
• 제19권6호
• /
• pp.541-548
• /
• 2008

• 화학세계
• /
• 제58권2호
• /
• pp.25-29
• /
• 2018

• Toxicological Research
• /
• 제13권1_2호
• /
• pp.157-160
• /
• 1997

The primary skin and eye irritancy of the combined vaccine (KGCC-95VI) for the prophylaxis against Japanese encephalitis and Hantaan virus infection recently developed by Korea Green Cross Corporation was investigated. The KGCC-95VI was applied to the back skins of the New Zealand White rabbits. The rabbits were observed for 72 hours and did not exhibit erythema, eschar and edema. The eyes of the rabbits were exposed to the KGCC-95VI. The rabbits were observed for 7 days and did not exhibit any ocular findings on cornea, iris and conjuntivae. The KGCC-95VI is considered not to have the primary skin and eye toxicity in rabbits.

• Bulletin of the Korean Chemical Society
• /
• 제34권7호
• /
• pp.2044-2050
• /
• 2013

A series of poly(glycerol-succinic acid) dithiocarbamate and 1,3,4-thiadiazole dendrimers, which have potential as anti-wear oil additives, were synthesized. Their anti-wear properties in three different oils (100N, DB-51, and soybean) were evaluated using a four-ball wear tester. The results indicated that thiocarbamate dendrimers have moderate anti-wear properties in DB-51 oil, and 1,3,4-thiadiazole dendrimers exhibited good anti-wear properties in 100N and DB-51 oils. However, dithiocarbamate and 1,3,4-thiadiazole dendrimers were not effective anti-wear additives in soybean oil.

• Applied Biological Chemistry
• /
• 제33권3호
• /
• pp.264-267
• /
• 1990

호습쇄의 NADH-ubiquinone oxidoreductase를 강력히 저해하는 합성 piericidin유사체로써 hydroxypyridine 및 hyoxyquinoline 유도체들이 전반적으로 좋은 살균활성을 보였다. 특히, hydroxypyfidine 유도체들은 벼도열병(Pyricularia oryzae)과 보리흰가루병(Erysiphe graminis)에 대해서 높은 살균활성을 나타했다.

• 대한의용생체공학회:학술대회논문집
• /
• 대한의용생체공학회 1995년도 추계학술대회
• /
• pp.134-137
• /
• 1995

Studies on the formulations of the additives such as antioxidants, crosslinking agent, and trans-stilbeneoxide (StO) with polypropylene (PP) have been carried out to improve the resistance of gamma radiation sterilization. The irradiated PP and ethylene-propylene copolymers samples with control and additives were characterized by mechanical tester, colorimetry, and Fourier transform infrared spectroscopy with total attenuated reflectance mode (FTIR-ATR). Crosslinking agent and StO formulated PP showed remarkable radiation resistance and minimum discoloration. Also, radiation resistance of ethylene propylene copolymers with 3% of ethylene contents was better than that of PP homopolymers in the case of no additives. The proposed mechanisms of radiation stabilization with additives are also discussed.

• 한국고분자학회:학술대회논문집
• /
• 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
• /
• pp.161-161
• /
• 2006

New polymeric and oligomeric OTFT materials containing fused aromatics such as anthracene and naphthalene have been designed, synthesized and characterized. The new OTFT materials were prepared by palladium-catalyzed Suzuki cross-coupling reaction. The obtained materials were characterized by various spectroscopic methods such as UV-vis, PL, cyclovoltametry, and XRD. The obtained OTFT materials containing fused aromatics showed high thermal stability above $350^{\circ}C$ In OTFT devices using new materials, high charge carrier mobility and on/off ratio were observed.

• Carbon letters
• /
• 제11권2호
• /
• pp.112-116
• /
• 2010

The objective of this study was to evaluate the possibility of simultaneous removal of ammonium, nitrate and phosphorus in water using the zeocarbon. In this study, the surface of zeocarbon was modified by acid because of difficulty in application of water treatment. After surface modification, the strength was enhanced about 62% higher than that of original one. The removal efficiency of ammonium and nitrate using the modified zeocarbon was about 47% and 32%, respectively and were higher than that of zeocarbon. In batch type experiment on the simultaneous removal of ammonium, nitrate and phosphorus, the presence of phosphorus did not have influence on nitrogen removal efficiency. Concomitantly, removal efficiency of phosphorus was obtained was about 35%. This indicates that the surface modified zeocarbon can be applied for simultaneous removal of nitrogen and phosphorus. Consequently, our results could be used as basic data to design of one-stage nitrogen/phosphorus simultaneous removal system.