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RISS 인기검색어
- 검색키워드
- 저자 : Motoi Machida (검색결과 3 건)
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Pyunghwa Yoo,Yoshimasa Amano,Motoi Machida 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.5
Nitrogen-free phenol resin fiber was used to examine the effect of nitrogen-introduction via thermal chemical vapor deposition (CVD) using nitrogen-containing chemicals. In this study, a combination of heat treatment, steam activation, aniline CVD was conducted to prepare the nitrogen-doped activated carbon (AC) and the effective procedure was studied to enhance arsenic adsorption capacity. As a result, consecutive treatment of steam activation as pre-treatment, aniline CVD, steam activation for porous structure, and at least heat treatment was the best processing order for the preparation of ACs. Heat-treated samples demonstrated their robustness against steam activation; therefore heat treatment should be conducted as post treatment for effective CVD process. One of the samples which was prepared by this procedure, 8ST30-8ANL10-8ST50-9.5HT30 (sample #5) showed 0.112 m㏖/g of arsenate adsorption capacity, and it was at least 70% higher than that of any other prepared samples. To inspect the high adsorption capacity of this sample, the effect of solution pH, pore structure parameters, elemental analysis, and Boehm titration was conducted comparing with the other prepared samples.
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Pyunghwa Yoo,Yoshimasa Amano,Motoi Machida 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.12
Nitrogen-doped activated carbon fibers (ACFs) were prepared by chemical vapor deposition using melamine powder and acetonitrile for introducing quaternary nitrogen on the commercial ACFs, subsequently heated at 950 oC and activated by steam. Adsorption experiments of nitrate in aqueous solution were also conducted to evaluate adsorption capacity of the prepared ACFs using ion chromatography. The amount of introduced nitrogen content and nitrogen species on activated carbon fibers was examined by CHN elemental analyzer and X-ray photoelectron spectroscopy, respectively. As a result, adsorption capacity of quaternary nitrogen-doped ACF (ST-ML-AN-ST) was 0.75mmol/g, indicating ca. two-times higher than that of untreated ACF (0.38mmol/g). According to the adsorption data, the Langmuir isotherm model was the best fit. The prepared samples were also regenerated using hydrochloric acid. After regeneration, the adsorption capacity of the nitrogen-doped ACF (ST-ML-AN-ST) showed ca. 80% on average, implying that a portion of nitrates was adsorbed on the prepared ACFs irreversibly.
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손주현,이민섭,한동욱,박봉주,박종석,Motoi Machida,Hideki Tatsumoto,박종철 한국생체재료학회 2004 생체재료학회지 Vol.8 No.2
In this study, the migration of MC3T3-E1 osteoblast-like cells was examined on the culture plate coated with ECM, such as type I collagen, laminin or fibronectin. The cells were incubated in a self-made mini-incubator, with the same conditions as commercial CO2 incubator, placed on an inverted microscope and observed as a real time-mode. After 24 hr of incubation, the edge and center of single cell were detected by an automated cell tracking system. From the cell movement path, it was shown that the cells had a tendency to move randomly without any certain direction. Furthermore, it could be found that the cell movement speed was divided into three phases, attachment preparation phase, from 0 to T1 hr, accelerated movement phase, from T1 to T2 hr and speed maintenance phase, till 24 hr. At first phase, a cell moved slightly as like searching a local attachment site. Afterwards, the cell accelerated its speed and reached the maximum speed, Vmax. To estimate the cell migration speed, the migration index was defined as the value of the Vmax divided by T2-T1. The migration index of the MC3T3-E1 cells on fibronectin was 8.9, while those indexes on the type I collagen and laminin were respectively 5.3 and 5.1. These results suggested that all cells might have their own migration index according to their species or phenotypes and ECM type, and the migration speed could be inferred from those values without further study.
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