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The reaction rate of polysilanes prepared by eledtroreduction with dirrerent monomers and additives
장봉군,진명량,오원춘 한국분석과학회 2008 분석과학 Vol.21 No.5
In this study, polysilanes were synthesized by electroreduction with different monomers such as CH3HSiCl2, PhSiCl3, CH3SiCl3 and (CH3)2SiCl2 by Mg electrodes under ultrasonic radiation. The effects of monomers and additives (p-dibromobenzene (DBB), naphthalene (NAPH) and anthracene (ANTH)) on the reaction rate were investigated. Polymerization of PhSiCl3 among the four monomers showed the highest rate. pdibromobenzene (DBB) was proved the most effective additive. Based on the observations, some possible reaction mechanisms of the polymerization were proposed.
진명량,장봉군,오원춘,Chen, Ming-Liang,Zhang, Feng-Jun,Oh, Won-Chun The Korean Society of Analytical Sciences 2008 분석과학 Vol.21 No.6
$CNT/TiO_2$ composites were prepared by using multiwall carbon nanotubes (MWCNT) and various titanium alkoxide precursors. The composites were comprehensively characterized by scanning electron microscopy (SEM), field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX) and UV-vis absorption spectroscopy. The photoactivity of the prepared materials under UV irradiation, was tested using the conversion of MB from model aqueous solution. Finally, according to the results of methylene blue (MB) removal experiment, we could see that sample CTOS have better MB removal effect than samples CTIP and CTPP.
진명량,장봉군,오원춘 한국분석과학회 2008 분석과학 Vol.21 No.6
CNT/TiO2 composites were prepared by using multiwall carbon nanotubes (MWCNT) and various titanium alkoxide precursors. The composites were comprehensively characterized by scanning electron microscopy (SEM), field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX) and UV-vis absorption spectroscopy. The photoactivity of the prepared materials under UV irradiation, was tested using the conversion of MB from model aqueous solution. Finally, according to the results of methylene blue (MB) removal experiment, we could see that sample CTOS have better MB removal effect than samples CTIP and CTPP.
여러 가지 탄소 전구체와 TNB를 이용하여 탄소-TiO2 복합체를 제조 및 그들의 광촉매 특성
진명량 ( Ming Liang Chen ),장봉군 ( Feng Jun Zhang ),장간 ( Kan Zhang ),맹칙달 ( Ze Da Meng ),오원춘 ( Won Chun Oh ) 한국고무학회 2010 엘라스토머 및 콤포지트 Vol.45 No.1
우리는 탄소 전구체로 활성탄 (AC), 활성탄 섬유 (ACF)와 탄소나노튜브 (MWCNT)와 티타늄 전구체로써 TNB를 사용하여 탄소-TiO2 복합체를 제조하였으며, 이들의 특성을SEM, TEM, BET, XRD와 EDX를 이용하여 분석하였다. 그리고 이들의 광촉매 활성은 UV 램프 조사에서 일정한 농도의 MB 용액을 이용하여 측정하였다. UV조사한 후에 MB의 농도는 UV-vis 분광광도기를 이용하여 측정하였다. We used activated carbon (AC), activated carbon fiber (ACF) and multi-walled carbon nanotube (MWCNT)as carbon sources and titanium n-butoxide as titanium source to prepare carbon-TiO2 composites. For characterization their properties, scanning electron microscopy (SEM), transmission electron microscopy (TEM), BET surface area, X-ray diffraction(XRD) and energy dispersive X-ray analysis (EDX) were used. And the photoactivity of the carbon-TiO2 composites, underUV irradiation, was tested using the fixed concentration of methylene blue (MB, C16H18N3S·Cl·3H2O) in aqueous solution. After UV irradiation for a certain time, the concentration of MB solution was determined by UV-vis absorption spectroscopy.
오원춘 ( Won Chun Oh ),고원배 ( Weon Bae Ko ),장봉군 ( Feng Jun Zhang ) 한국고무학회 2010 엘라스토머 및 콤포지트 Vol.45 No.2
탄소나노튜브는 우수한 기계적 특성, 전기적 및 자기적 성질 뿐만 아니라 나노 크기의 직경 및 높은 종횡비를 나타낸다. 이는 고강도 고분자 복합체의 이상적인 보강제로 사용할 수 있다. 기능성이 부과된 탄소나노튜브는 기능성 재료 및 복합재료의 제조와 같은 분야에서 아주 유력한 재료로 믿어진다. 탄소나노튜브-고분자 복합체는 탄소나노튜브의 우수한 기능성과 고분자의 우수한 가공성을 가질 것으로 기대된다. 그러나, 탄소나노튜브는 보통 반 델 바알스 작용에 의한 안정화된 번들을 형성하기 때문에 고분자 기지에 배열이나 분산이 상당히 어렵다. 탄소나노튜브 강화복합체의 제조에서 가장 큰 이슈는 고분자내에 탄소나노튜브의 효과적인 분산이며, 기지내에 탄소나노튜브의 배열과 양의 조절이다. 고분자 기지내에 탄소나노튜브의 분산은 용액혼합, 벌크 혼합, 용융혼합, 즉시 고분자화 반응 및 탄소나노튜브의 화학적 기능화 등과 같은 몇 가지 방법이 있다. 본 논평에서는 이들 방법과 고성능 탄소나노튜브-고분자 복합체의 제조에 대하여 서술하고자 한다. Carbon nanotubes (CNTs) exhibit excellent mechanical, electrical, and magnetic properties as well as nanometer scale diameter and high aspect ratio, which make them an ideal reinforcing agent for high strength polymer composites. The functionalized CNTs are believed to be very promising in the fields such as preparation of functional and composite materials. CNT-Polymer composites are expected to have good processability characteristics of the polymer and excellent functional properties of the CNTs. However, since CNTs usually form stabilized bundles due to Van der Waals interactions, are extremely difficult to disperse and align in a polymer matrix. The biggest issues in the preparation of CNT-reinforced composites reside in efficient dispersion of CNTs into a polymer matrix, and the alignment and control of the CNTs in the matrix. There are several methods for the dispersion of nanotubes in the polymer matrix such as solution mixing, bulk mixing, melt mixing, in-situ polymerization and chemical functionalization of the carbon nanotubes, etc. These methods and preparation of high performance CNT-polymer composites are described in this review.