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- 저자 : 장성찬 (검색결과 53 건)
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장성찬,강성민,이일송,노창현,허윤석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Radioactive contaminant adsorbents require well-designed morphologies for effective interaction with radioactive species selectively and high structural stability during adsorption. Herein, we demonstrate a pomegranate-like micro-scavenger cage (P-MSC) with high adsorption capacity towards radioactive cesium (<sup>137</sup>Cs). The resulting micro-scavenger cage shows enhancing properties compared to alginate bead gelled by traditional methods using Ca<sup>2+</sup>. The proton-exchange between cesium and P-MSC result in rapid adsorption, within 10 min, with a high removal capacity. The resulting P-MSC has a 236-fold higher distribution coefficient toward cesium than traditional Ca-alginate bead. The maximum cesium removal capacity of the P-MSC is 108.06 mg/g. It is found that the P-MSC have a removal efficiency of 99.24% for radioactive cesium, showing that the material holds great promise for the clean-up of radioactive cesium contaminated seawater around nuclear plants and/or after nuclear accidents.
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프러시안 블루 (PB)의 방사성 세슘 흡착 메커니즘 연구
장성찬,김준영,허윤석,노창현 한국방사선산업학회 2015 방사선산업학회지 Vol.9 No.3
Since the accident at the Fukushima Daiichi power plant, Prussian blue (PB) hasattracted increasing attention as a material for use in decontaminating the environment. Wehave focused the fundamental mechanism of specific Cs+ adsorption into PB in order to develophigh-performance PB-based Cs+ adsorbents. The ability of PB to adsorb Cs varies considerablyaccording to its origin such as what synthesis method was used, and under what conditions the PBwas prepared. It has been commonly accepted that the exclusive abilities of PB to adsorb hydratedCs+ ions are caused by regular lattice spaces surrounded by cyanido-bridged metals. Cs+ ions aretrapped by simple physical adsorption in the regular lattice spaces of PB. Cs+ ions are exclusivelytrapped by chemical adsorption via the hydrophilic lattice defect sites with proton-exchange fromthe coordination water. Prussian blue are believed to hold great promise for the clean-up of 137Cscontaminated water around nuclear facilities and/or after nuclear accidents.
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장성찬,박태진,김민선,홍혜현,김미진,김승영 한국생물공학회 2018 KSBB Journal Vol.33 No.4
Several compounds such as libanoridin, heterocarpin,and columbianetin A and crude extract were isolatedrespectively from Corydalis heterocarpa and Corydalis bungeanaand were reported to have anti-tumorigenic and antiinflammatoryproperties. Corydalis platycarpa (Maxim.) Makino,another Fumariaceae member, have acclimated and prosperedin Jeju Island, South Korea. However, the synergisticand inhibition effect of Corydalis platycarpa (Maxim.) Makinocrude extract on the expression of LPS-induced inflammatorycytokines and mediators has not been yet examined. Quantitative reverse transcription PCR (qRT-PCR) and immunoblottingwere implemented to examine representativeinflammatory markers. We found the Corydalis platycarpa(Maxim.) Makino extract (CPE) inhibited dose-dependentlythe secretion of the five pro-inflammatory indicators NO, PGE2and TNF-α and suppressed mRNA expressions of iNOS, COX-2, TNF-α, IL-1β, and IL-6. Furthermore CPE exerted its dosedependentanti-inflammatory effect via NF-κB/IκB signalingpathway while down-regulating the protein expression level ofiNOS and COX-2 and suppressing the secretion of pro-inflammatorycytokines such as PGE2 and TNF-α. CPE would be furtherapplied to the development of pharmaceuticals and functionalcosmetic ingredients.
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장성찬,권영준,채수빈,최원석 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
We report on the electromagnetic interference shielding behavior of MWCNT/Carbon black/Graphite nanocomposites fabricated by the rotate milling process to demonstrate the contribution of the process to shielding properties. The carbon hybrid composites showed excellent shielding response, which is majorly governed by absorption losses. The results show that the total EMI shielding effectiveness (SE) value is 32 dB at 0.3~1.5 GHz for carbon hybrid composites at 20 um thickness, dominated by absorption mechanism, which overpowered the 10 dB value of graphene oxide. The presence of carbon materials enhances space charge polarization, multiple scattering and effective anisotropy energies of the carbon hybrid composites, resulting in high electromagnetic shielding effectiveness. The dielectric behavior was evaluated to correlate with the EMI shielding mechanism.
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보문 : 재료 (유/무기, 전자, 반도체)·고분자·나노기술·반도체기술·마이크로반응기 ; 미세유로 내에서 Pseudomonas aeruginosa의 유영 운동 분석
장성찬 ( Sung Chan Jang ),정현호 ( Heon Ho Jeong ),이창수 ( Chang Soo Lee ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.4
본 논문에서는 미세 환경이 Pseudomonas aeruginosa의 운동성에 주는 영향을 조사하기 위하여 다양한 크기의 미세 유로 내에서 박테리아의 운동성을 분석하였다. 본 논문에서는 미세유체 칩을 사용하여 2차원 공간을 만들며, 10~100 μm 너비의 채널 안에서 단일 박테리아의 운동 변수인 이동속도, ``run``운동 지속시간, ``tumble`` 각도를 측정하였고 각 미세유로 내에서 박테리아의 운동을 표현할 수 있는 물리적 상수인 random motility coefficient를 구하였다. 상기의 물리적 측정치를 분석한 결과, 박테리아는 공간제약이 있는 경우 편모의 운동이 채널의 벽의 영향으로 인하여 회전 운동 에 영향을 받게 되고, ``run`` 운동 지속 시간이 짧아지는 것을 확인하였다. 따라서, 공간의 제한이 박테리아의 운동성을 감소시킴을 알 수 있었다. 본 연구의 결과는 박테리아의 운동성을 쉽고 정확하게 분석할 수 있는 측정 방법으로 널리 활용될 것으로 기대된다. This study presents the effects of micro-geometries on the swimming behavior of Pseudomonas aeruginosa. First, we have measured parameters of single-cell motility including cell speed, run duration time, and tumble angle under two dimensional space, The results are used to calculate motility coefficients in the width of microchannels ranging from 10 to 100μm, Since the single-cell motility parameters measured depend on the interaction of flagella with the microchannel wall, the duration time of the running cell in restricted geometries is distinctively different. Therefore, the motility of bacteria is decreased by restricted geometries. This study suggests that microfluidic approach is useful tool for the analysis of bacterial motility under the restricted space and rapid analytical tool.
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