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Kang, Taewook,Oh, Seogil,Hong, Surin,Moon, Jungwoo,Yi, Jongheop Royal Society of Chemistry 2006 Chemical communications Vol.2006 No.28
<P>A new simpler concept about the signal amplification of surface plasmon resonance (SPR) that is based on the utilization of mesoporous silica thin films is demonstrated. As compared to monolayer based coatings, mesoporous silica thin films of ∼200 nm extend the interaction arena away from the metal, thus permitting the integration of the change in optical contrast at different distances from the sensor surface.</P> <P>Graphic Abstract</P><P>A new simpler concept about the signal amplification of surface plasmon resonance (SPR) that is based on the utilization of mesoporous silica thin films is demonstrated. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b600140h'> </P>
이종협,김남동,Seogil Oh,주지봉,Kwang Seop Jung 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.2
Relationships between surface structure and catalytic properties were investigated for a series of copper chromium catalysts. The catalysts were prepared using methods involving impregnation and precipitation, and their catalytic activities were evaluated for the hydrogenolysis of glycerol. Catalyst (10I and 50I) prepared by the impregnation method contained a mixed phase of both individual copper and chromium oxide structures, while the catalyst (50P)prepared by precipitation showed a single phase, with a copper chromite spinel structure (CuCr2O4). XPS data indicated that, after the reduction step, the copper species in the impregnated catalyst was reduced to Cu0, but the catalyst prepared by the precipitation method retained a spinel structure evidenced by the large amount of Cu2+ species. In hydrogenolysis reactions, the precipitated catalyst showed a higher catalytic activity than the impregnated catalyst. Thus,the reduced copper chromite spinel structure, which constitutes a single phase, appears to be responsible for the high catalytic activity in the hydrogenolysis of glycerol to propylene glycol.
Moon, Jungwoo,Oh, Seogil,Kang, Taewook,Hong, Surin,Yi, Jongheop American Scientific Publishers 2006 Journal of Nanoscience and Nanotechnology Vol.6 No.11
<P>Molecular adsorption of bisphenol A (BPA) on three types of self-assembled monolayers with different functionalities, such as -CH3, -SH, and -COOH, was examined using surface plasmon resonance (SPR) spectroscopy. BPA molecules in an aqueous solution were easily adsorbed onto a hydrophobic surface compared to a hydrophilic surface. Sorption behavior of BPA into poly(2-methoxyethyl acrylate) (PMEA) layer, which is known as a biocompatible polymer, was also investigated. Sorption and desorption dynamics of BPA into PMEA were found to be very rapid and quite reversible. The swelling of PMEA by sorption of BPA results in the change in SPR angle and allows one to quantify the BPA concentration below 100 ppm. In addition, the transport mechanism of BPA within the membrane of organ can be inferred by the experimental results.</P>
Kang, Taewook,Hong, Surin,Moon, Jungwoo,Oh, Seogil,Yi, Jongheop Royal Society of Chemistry 2005 Chemical communications Vol.2005 No.29
<P>The proposed procedure for recycling the sensor surface consists of (1) the self-assembly of 2-aminoethanethiol hydrochloride (AET) on the Au substrate, (2) the neutralization of zwitterion-like species, –NH<SUB>3</SUB><SUP>+</SUP>Cl<SUP>−</SUP> to –NH<SUB>2</SUB> by treatment with a NaOH solution (pH 11), (3) the detection of Cu<SUP>2+</SUP> on the NaOH-treated AET–Au substrate, and finally (4) regeneration of the sensor surface from [–NH<SUB>2</SUB> → Cu<SUP>2+</SUP>] to [–NH<SUB>3</SUB><SUP>+</SUP>Cl<SUP>−</SUP>] by treatment with 1 M HCl.</P> <P>Graphic Abstract</P><P>The proposed procedure for recycling the sensor surface consists of (1) the self-assembly of 2-aminoethanethiol hydrochloride, (2) the neutralization of zwitterion-like species, –NH<SUB>3</SUB><SUP>+</SUP>Cl<SUP>−</SUP> to –NH<SUB>2</SUB>, (3) the detection of Cu<SUP>2+</SUP>, and finally (4) regeneration of the sensor surface. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b504064g'> </P>
Synthesis of superacidic mesoporous alumina and its application in the dehydration of glycerol
이종협,주지봉,Lina Yang,You Jung Kim,Seogil Oh,김남동 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.5
Superacid ZrO2/SO4 2− (SZ) was supported on mesoporous alumina (MA) to synthesize a novel superacid catalyst (SZMAP) with high active surface area. The synthesized catalyst was characterized by both physical and chemical methods, including XRD, BET, NH3-TPD and TEM. The prepared superacidic mesoporous alumina (SZMAP) showed typical gamma-alumina phase patterns and uniform mesoporous structures with a regular channel arrangement. NH3-TPD analysis indicated that SZMAP has superacidic characteristics. The SZMAP catalyst was used in the dehydration of glycerol to acrolein. Results showed that SZMAP showed much higher catalytic activity than the bulk superacid, ZrO2/SO4 2− (SZ), and MA due to the high dispersion of active SZ molecules, which results from a large surface area and uniform mesopores of mesoporous alumina.
Hong, Surin,Kang, Taewook,Moon, Jungwoo,Oh, Seogil,Yi, Jongheop American Scientific Publishers 2006 Journal of Nanoscience and Nanotechnology Vol.6 No.11
<P>A self-assembled biomolecule was used to create a highly sensitive sensor surface for detecting toxic chemical species (polychlorinated biphenyls, PCBs). We fabricated the nanostructured sensor surface via the self-assembly of cytochrome <I>c</I> on a Au thin film. Surface plasmon resonance (SPR), an evanescent wave technique possessing maximum sensitivity on the surface and characterized by an exponential decay of sensitivity with distance from the surface, was utilized as the principle for signal transduction. When this sensor surface was used for the detection of PCB, even trace amounts of PCB (from 0.1 ppb to 8.0 ppb) in an aqueous solution were readily detectable.</P>