• Title/Summary/Keyword: MCM-C

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Catalytic decomposition of HDPE over Al-MCM-48 using TGA and Py-GC/FID (TGA와 Py-GC/FID를 이용한 Al-MCM-48상에서 HDPE의 촉매(觸媒) 열분해(熱分解))

  • Kim, Young-Min;Kim, Seung-Do;Park, Young-Kwon;Kim, Ji-Man;Jeon, Jong-Ki
    • Resources Recycling
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    • v.15 no.5 s.73
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    • pp.17-25
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    • 2006
  • Al-MCM-48 was used as a catalyst to decompose high density polyethylene(HDPE). Catalytic activity of Al-MCM-48 was compared with those of Al-MCM-41, Beta, and ZSM-5. Catalytic decomposition rate over Al-MCM-48 was much higher than at of non-catalytic pyrolysis only. Compared to other catalysts, Al-MCM-48 revealed the little higher activation energy value. The progressive deactivation behavior of the catalysts has also studied. ZSM-5 and Al-MCM-48 showed slower deactivation rates than Al-MCM-41 and Beta. Pyrolysis coupled with gas chromatographic separation and flame ionization detection (Py-GC/ FID) was also performed to assess the characteristics of pyrolysis products. ZSM-5 gave a higher fraction of gaseous products ($C_1-C_4$). Al-MCM-41 and Beta produced mainly $C_5-C_{12}$ products. The selectivity to oil product ($C_5-C_{22}$) obtained with Al- MCM-48 is higher an that with the other catalysts employed in this study.

Effect of Aluminium Addition to MCM-41 on Catalytic Cracking of an LDPE-LLDPE-EVA Copolymer Mixture (MCM-41을 이용한 LDPE-LLDPE-EVA 공중합체 혼합물의 접촉 열분해 반응에 미치는 Aluminium 첨가 효과)

  • Kim, Min Ji;Jeon, Jong-Ki;Park, Young-Kwon;Ko, Young Soo;Sohn, Jung Min
    • Korean Chemical Engineering Research
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    • v.45 no.2
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    • pp.117-123
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    • 2007
  • The effect of aluminium addition to MCM-41 on product yield and carbon number distribution was investigated in the catalytic cracking of a polymer mixture, LDPE, LLDPE, and EVA copolymer, with a composition similar to that found in real agricultural film wastes. Al-MCM-41 catalyst synthesized by post-synthetic grafting method (Al-MCM-41-P) as well as Al-MCM-41 catalyst synthesized by direct sol-gel (Al-MCM-41-D). The catalytic cracking of polymer mixture was carried out in vapor phase contact as well as in liquid phase contact. The amount of acid sites increased with aluminium addition by post method as well as direct method, which was seemed to be due to Lewis acid sites. In liquid phase catalytic cracking, the yield of light hydrocarbon fraction increased with aluminium addition. The effect of aluminium addition on production of $C_5-C_{12}$ hydrocarbons over Al-MCM-41-P catalysts was greater than that over Al-MCM-41-D catalysts. In the case of vapor phase catalytic cracking, the effect of aluminium addition was smaller than that of liquid phase catalytic cracking. The selectivity to $C_{13}-C_{32}$ hydrocarbons was smaller in vapor phase catalytic cracking.

The Effects of C2F6 Plasma Cleaning on Via Formation in MCM-D Substrate using photosensitive BCB (감광성 BCB를 사용한 MCM-D 기판에서 C2F6 플라즈마 clcaning 이 비야형성에 미 치는 영향)

  • 이영민
    • Journal of the Microelectronics and Packaging Society
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    • v.5 no.2
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    • pp.7-12
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    • 1998
  • 감광성 BCB를 사용한 MCM-D기판에 신뢰성있는 비아형성을 위하여 BCB의 공정 특성과 C2F6를 사용한 플라즈마 cleaning 영향을 분석하였다. 절연막, 금속배선재료로 각각 감광성 BCB, Cu를 사용하여 MCM-D 기판을 제작 분석한 결과 BCB는 soft bake 후 초기 두께의 50%정도 두께 손실이 있었으며 해상도는 15um이었다. BCB층에 비아 형성후 C2F6 가스로 플라즈마 cleaning 하고 AES로 비아표면을 분석한 결과 유기물 C는 검출되지 않은 반면 플라즈마 cleaning을 하지 않은 비아를 분석한 결과 유기물 성분의 C가 많이 검출되었 고 Ar 스퍼터에 의해서도 완전히 제거되지 않았다. 따라서 감광성 BCB를 절연막으로 사용 한 MCM-D 기판 제작공정에서 비아 형성후 C2F6를 이용한 플라즈마 cleaning의 필요성을 확인하였다.

Self-assembly directed synthesis of tubular conducting polymer inside the channels of MCM-41

  • Showkat, Ali Md.;Lee, Kwang-Pill;Gopalan, Anantha Iyengar;Reddy, K. Raghava;Kim, Sang-Ho;Choi, Seong-Ho
    • Analytical Science and Technology
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    • v.19 no.3
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    • pp.211-217
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    • 2006
  • Diphenyl amine (DPA) was polymerized inside the channels of the mesoporous silica (MCM-41). MCM-41 (C) and MCM-41 (D) were prepared with cetyltrimethyl ammonium bromide (CTAB) and dodecyltrimethyl ammonium bromide (DTAB), respectively and used as hosts. Initially, the self assembly of DPA inside the pores of MCM-41 was made in ${\beta}$-naphthalene sulfonic acid (NSA) medium and subsequently poly (diphenylamine), PDPA was formed by oxidative polymerization. $N_2$ adsorption-desorption measurements of PDPA loaded MCM-41 (C) and MCM-41 (D) show variations in pore volume and surface area between them. A tubular form of poly (diphenylamine), PDPA was envisaged to form in the pores of MCM-41 and supported by high resolution transmission microscopy. The presence of PDPA inside the channel of MCM-41 was further confirmed by FTIR spectroscopy, thermogravimetric analysis (TGA), X-ray diffraction.

CO2 Removal using MEA (monoethanolamine) Impregnated Mesoporous Materials (MEA (monoethanolamine) 함침 메조포러스 물질을 이용한 CO2 회수)

  • Park, Ye-Won;Baek, Il-Hyun;Park, Sang-Do;Lee, Jae-Wook;Park, So-Jin
    • Korean Chemical Engineering Research
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    • v.45 no.6
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    • pp.573-581
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    • 2007
  • The present study deals with removal of $CO_2$ using various mesoporous materials impregnated with MEA (monoethanolamine). The mesoporous materials such as MCM-41, MCM-48 and SBA-15 were synthesised and then impregnated with 30, 50 and 70 wt% of MEA, respectively. XRD, FT-IR and SEM were used to evaluate the characterization of those. From the adsorption/desorption experiments for various materials, the adsorption capacity of these materials were found in the order of MCM-41> MCM-48> SBA-15. MCM-41 impregnated with 50 wt% of MEA showed the maximum adsorption capacity of $57.1mg-CO_2/gr-sorbent$ at $40^{\circ}C$. It is nearly 8 times higher than MCM-41 without impregnation of MEA. In the multiple cycle test of 20 times, MCM-41 impregnated with 50 wt% of MEA showed a constant adsorption capacity.

Study on Via hole formation in multi layer MCM-D substrate using photosensitive BCB (감광성 BCB를 사용한 다층 MCM-D 기판에서 비아홀 형성에 관한 연구)

  • 주철원;최효상;안용호;정동철;김정훈;한병성
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.07a
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    • pp.99-102
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    • 2000
  • Via for achieving reliable fabrication of MCM-D substrate was formed on the photosensitive BCB layer. MCM-D substrate consists of photosensitive BCB(Benzocyclobutene) interlayer dielectric and copper conductors. In order to form the vias in photosensitive BCB layer, the process of BCB and plasme etch using $C_2$F$_{6}$ gas were evaluated. The thickness of BCB after soft bake was shrunk down to 60% of the original. AES analysis was done on two vias, one is etched in $C_2$F$_{6}$ gas and the other is non etched. On via etched in $C_2$F$_{6}$, native C was detected and the amount of native C was reduced after Ar sputter. On via non etched in $C_2$F$_{6}$, organic C was detected and amount of organic C was reduced a little after Ar sputter. As a result of AES, BCB residue was not removed by Ar sputter, so plasma etch is necessary for achieving reliable via.ble via.

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Effect of Korean Mistletoe Extract M11C (Non-lectin Components) on the $TNF-\alpha$ Expression and Secretion from Human Peripheral Blood Monocytes (한국산 겨우살이 추출물 M11C (렉틴 구성물질)가 단구세포의 $TNF-\alpha$ 유전자 발현유도 및 분비에 미치는 효과)

  • Jun, Myung-Ha;Kang, Tae-Bong;Chang, Sung-Ho;Choi, Wahn-Soo;Seong, Nak-Sul;Her, Erk
    • Korean Journal of Medicinal Crop Science
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    • v.15 no.1
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    • pp.30-37
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    • 2007
  • It is well-known that Korean mistletoe (Viscum album) extract has an immune activity and anticancer effect. In this study, Korean mistletoe extract, M11C (non-lectin components), was used to examine whether this extract might activate human peripheral monocyte to produce tumor necrosis $factor-\alpha$ $(TNF-\alpha)$. To examine the effect of M11C on the production of $TNF-\alpha$ from monocyte, the monocyte were stimulated by the M11C, and then collected the supernatant (M11C stimulated monocyte-conditioned media; MCM). MCM was treated to the $TNF-\alpha$ sensitive L929 cells, and then L929 cytotoxicity was measured by means of MTT. MCM had cytotoxic effect on L929. And the cytotoxic effect of MCM on L929 was almost abolished by $anti-TNF-\alpha$ antibody. These data indicated that MCM contained $TNF-\alpha$, suggesting the $TNF-\alpha$ generation from M11C-stimulated monocyte. This suggestion was confirmed from the data that $TNF-\alpha$ was highly detected in MCM by immunoblotting technique. M11C effect on $TNF-\alpha$ production from monocyte was in the dose and stimulating time dependent manners. Also the effect of M11C on the expression of $TNF-\alpha$ mRNA from monocyte was shown in the dose and stimulating time dependent manners. As a result, Korean mistletoe extract, M11C, could be used for an immunostimulator.

Identification and characterization of a rice MCM2 homologue required for DNA replycation

  • Cho, Jae-Han;Kim, Ho-Bang;Kim, Hyung-Sae;Choi, Sang-Bong
    • BMB Reports
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    • v.41 no.8
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    • pp.581-586
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    • 2008
  • The pre-replication complex (pre-RC), including the core hexameric MCM2-7 complex, ensures that the eukaryotic genome is replicated only once per cell division cycle. In this study, we identified a rice $\underline{m}ini\underline{c}hromosome$ $\underline{m}aintenance$ (MCM) homologue (OsMCM2) that functionally complemented fission yeast MCM2 (CDC19) mutants. We found OsMCM2 transcript expression in roots, leaves, and seeds, although expression levels differed slightly among the organs. Likewise, the OsMCM2 protein was ubiquitously expressed, but it was downregulated when nutritients were limiting, indicating that MCM2 expression (and therefore cell cycle progression) requires adequate nutrition. Yeast two-hybrid and GST pull-down assays demonstrated that OsMCM2 interacted with the COP9 signalosome 5 (CSN5). Taken as a whole, our results indicated that OsMCM2 functions as a subunit of the rice MCM complex and interacts with CSN5 during developmental regulation.

The analysis of the behavior of embedded resistor in MCM-C modules (MCM-C 모듈내에서의 내층형 저항의 거동 해석)

  • Yoo, Joshua;Lee, W.S.;Park, J.C.;Kim, J.W.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.07b
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    • pp.764-767
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    • 2003
  • Nowadays, the study on the ceramic components and modules using LTCC is being peformed and on the passives included in modules is being done also. Especillay frequency dependent components like capacitor and inductor are studied by many groups, but the behavior of embedded resistor in MCM-C module are not studied vigorously. The characteristics of embedded resistor in modules is different from that of resistor alone. In our research, behavior of embedded resistor is examined in the variation of position and geometrical parameters.

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The analysis of the behavior of embedded resistor in MCM-C modules (MCM-C 모듈내에서의 내층형 저항의 거동 해석)

  • Yoo, Jo-Shua;Lee, W.S.;Park, J.C.;Kim, J.W.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.07b
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    • pp.599-602
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    • 2004
  • Nowadays, the study on the ceramic components and modules using LTCC is being peformed and on the passives included in modules is being done also. Especillay frequency dependent components like capacitor and inductor are studied by many groups, but the behavior of embedded resistor in MCM-C module are not studied vigorously. The characteristics of embedded resistor in modules is different from that of resistor alone. In our research, behavior of embedded resistor is examined in the variation of position and geometrical parameters.

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