• 한국진공학회:학술대회논문집
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• 한국진공학회 2007년도 제32회 학술대회 초록집
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• pp.121-121
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• 2007

• Bulletin of the Korean Chemical Society
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• 제35권12호
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• pp.3601-3608
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• 2014

RGB light emitting ZnSe based nanocrystals: ZnSe (blue), ZnSe:Cu (green) and ZnSe:Mn (red) were synthesized by capping the surface of the nanocrystals with oleic acid. The obtained nanocrystal powders were characterized by using XRD, HR-TEM, ICP-AES, FT-IR, and FT-Raman spectroscopies. The optical properties were also measured by UV/Vis and photoluminescence (PL) spectroscopies. The PL spectra showed broad emission peaks at 471 nm (ZnSe), 530 nm (ZnSe:Cu) and 665 nm (ZnSe:Mn), with relative PL efficiencies in the range of 0.7% to 5.1% compared to a reference organic dye standard. The measured average particle sizes from the HR-TEM images for those three nanocrystals were 4.5 nm on average, which were also supported well by the Debye-Scherrer calculations. The elemental compositions of the ZnSe based nanocrystals were determined by ICP-AES analyses. Finally, the drawn CIE diagram showed the color coordinates of (0.15, 0.16) for ZnSe, (0.22, 0.57) for ZnSe:Cu, and (0.62, 0.35) for ZnSe:Mn respectively, which were fairly well matched to that of the RGB color standards.

• Asian-Australasian Journal of Animal Sciences
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• 제23권4호
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• pp.501-507
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• 2010

Three hundred chicks were randomly assigned among four treatments to evaluate the effect of an organic selenium supplement at various levels of dietary protein. Two levels of supplemental selenium (0 and 0.3 mg/kg) from zinc-L-selenomethionine were tested at two levels of dietary protein (normal and reduced) in a completely randomized design with $2{\times}2$ factorial layout. The experiment lasted up to 49 d of age during which all birds were exposed to $31{\pm}1^{\circ}C$. The effects of selenium or its interaction with CP on growth performance and carcass characteristics were not significant. However, feeding the reduced-CP diet decreased weight gain in the starting period and increased liver and abdominal fat weights relative to body weight. Ferric reducing ability of plasma (FRAP) was not significantly affected by dietary CP and Se or their interaction though FRAP values were numerically higher in the Se-supplemented group. Dietary CP content did not affect the activity of plasma glutathione peroxidase (GSHPx), though Se significantly elevated plasma GSHPx activity. The interaction of CP and Se was not significant for FRAP and plasma GSHPx activity.

• 한국세라믹학회지
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• 제52권6호
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• pp.489-496
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• 2015

In this study, novel $Ag_2Se$ sensitized $TiO_2$ nanocomposites were prepared by facile sonochemical assisted synthesis method. The as-prepared products were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM), and N2 adsorption BET analysis. The as-prepared $Ag_2Se/TiO_2$ nanocomposites simultaneously possessed great adsorptivity for organic dyes and efficient charge separation properties. In the decolorization of rhodamine B, a significant enhancement in the reaction rate was observed for the $Ag_2Se/TiO_2$ nanocomposite compared to the cases of using pure P25 or $TiO_2$. The sonocatalysis activity was higher due to the greater formation of reactive radicals, as well as to the increase of the active surface area of the $Ag_2Se/TiO_2$ nanocomposite.

• Bulletin of the Korean Chemical Society
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• 제30권6호
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• pp.1317-1324
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• 2009

Asymmetric transfer hydrogenation of α-functionalized arylketones has been studied. The chiral Rh-catalyst effectively performed in transfer hydrogenation of $\alpha$-mesyloxyketones with an azeotropic mixture of formic acid/triethylamine to produce optically active 1-arylethandiols with excellent enantioselectivity.

• 한국축산식품학회지
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• 제26권2호
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• pp.197-203
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• 2006

본 연구는 비육돈 사료내 Se과 비타민 E를 첨가하였을 때 육질 특성 및 저장성을 알아보기 위해 실시하였다. 3원 교잡종($Landrace{\times}Yorkshire{\times}Duroc$) 비육돈 80두를 공시하였으며, 시험개시시의 체중은 74.74 kg이었다. 시험설계는 Se의 첨가수준과 첨가형태에 따라 1) CON(basal diet), 2) ISE2 (basal diet + 0.2 ppm inorganic Se + 100 ppm vitamin E), 3) ISE4(basal diet + 0.4 ppm inorganic Se + 100 ppm vitamin E), 4) OSE2(basal diet + 0.2 ppm organic Se + 100 ppm vitamin E) 및 5) OSE4(basal diet +0.4 ppm organic Se + 100 ppm vitamin E)로 5처리를 하여 처리당 4반복, 반복당 4마리 씩 완전임의 배치하였다. 가열 감량은 ISE4 처리구가 CON 처리구와 비교하여 유의적으로 낮게 나타났다(p<0.05). 조지방 함량은 OSE2 처리구가 다른 처리구들과 비교하여 유의적으로 높게 나타났다(p<0.05). 적색도를 나타내는 $a^*$-값은 저장 10일째 OSE2 처리구가 다른 처리구들과 비교하여 유의적으로 높게 나타났다(p<0.05). TBARS에서도 저장 10일째에 OSE4 처리구가 CON과 ISE2 처리구와 비교하여 유의적으로 낮게 나타났다(p<0.05). 결론적으로, 비육돈 사료내 Se와 비타민 E를 첨가하였을 때 가열감량, 육색 및 지방산패도에 미치는 영향은 미미한 것으로 사료된다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제43회 하계 정기 학술대회 초록집
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• pp.395-395
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• 2012

We fabricate organic-inorganic hybrid thin film for the purpose of encapsulation by molecular layer deposition (MLD) using Trimethylaluminium (TMA) and Adipoyl Chloride (AC). Ellipsometry was employed to verify self limiting reaction of ALD. Linear relationship between number of cycle and thickness was obtained. We found that desirable organic thin film fabrication is possible by MLD surface reaction in nanoscale. Purging was carried out after dosing of each precursor to form monolayer in each sequence. We also confirmed roughness of the organic thin film by atomic force microscopy. We deposit TMA and AC at $70^{\circ}C$ and that 1.78A root mean square was obtained which indicates that uniform organic thin film was formed. We confirmed precursor's functional group by IR spectrum. We calculated WVTR of organic-inorganic hybrid super-lattice epitaxial layer using Ca test. WVTR indicates superlattice film can be possibly use as encapsulation in flexible devices.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제44회 동계 정기학술대회 초록집
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• pp.274-274
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• 2013

We fabricate encapsulation-layer of OLED panel from organic-inorganic hybrid thin film by atomic layer deposition (ALD) molecular layer deposition (MLD) using Al2O3 as ALD process and Adipoyl Chloride (AC) and 1,4-Butanediamine as MLD process. Ellipsometry was employed to verify self-limiting reaction of MLD. Linear relationship between number of cycle and thickness was obtained. By such investigation, we found that desirable organic thin film fabrication is possible by MLD surface reaction in monolayer scale. Purging was carried out after dosing of each precursor to eliminate physically adsorbed precursor with surface. We also confirmed roughness of the organic thin film by atomic force microscopy (AFM). We deposit AC and 1,4-Butanediamine at $70^{\circ}C$ and investigated surface roughness as a function of increasing thickness of organic thin film. We confirmed precursor's functional group by IR spectrum. We calculated WVTR of organic-inorganic hybrid super-lattice epitaxial layer using Ca test. WVTR indicates super-lattice film can be possibly use as encapsulation in flexible devices.

• 한국응용과학기술학회지
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• 제25권1호
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• pp.91-106
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• 2008

Development of white light emitting materials has been an interesting area for scientists and scientists have developed many organic, polymer and inorganic materials for white electroluminescent devices. Among them, single component small molecules gave best results in terms of efficiency, simplicity of device fabrication, and CIE values. Therefore, this review covers detailed discussion about syntheses of small compounds used in white organic light emitting devices until 2007.

• 대한환경공학회지
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• 제30권10호
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• pp.1028-1033
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• 2008

본 연구의 목적은 SeCAH(Sequential quick crushing and alkali hydrolysis)를 이용하여 음식물쓰레기의 용해도를 개선하고 혐기성 소화시 저해 가능 인자를 평가하는 데 있다. 궁극적으로 전처리된 음식물쓰레기를 첨가하여 양돈슬러리의 낮은 COD/N비를 증가시키고 저해인자를 감소시켜 CH$_4$ 생성율을 증가시키는 것이다. SeCAH를 이용하여 음식물쓰레기를 전처리한 후 용해도는 1.5배 이상 증가되었다. 용해도 증가와 소모된 에너지를 고려할 때 SeCAH는 효과적인 전처리 방법이며 적정 파쇄강도와 파쇄시간은 각각 2,000 rpm과 5$\sim$10 sec로 확인되었다. 전처리된 음식물쓰레기의 조대입자(>2.36 mm) 분율은 88.0%에서 29.0%로 크게 감소하였고, 작은 입자(<75 $\mu$m) 분율은 10.5%에서 40.7%로 증가되었다. SeCAH로 처리한 후 Na$^+$ 농도가 3795.0$\sim$6250.0 mg/L로 증가되어 양돈슬러리와 혐기성 병합소화시 Na$^+$가 저해 가능인자인 것으로 평가되었고 NH$_4^+$-N는 Stripping(pH>10)에 의해 감소되었다. 양돈슬러리 저해 가능인자는 NH$_4{^+}$-N(3331.3 mg/L), K$^+$(4256.5 mg/L) 그리고 SO$_4{^{2-}}$(1017.5 mg/L)이었다. 따라서 음식물쓰레기 용해도 증가에 SeCAH는 매우 효과적인 것으로 SeCAH는 음식물쓰레기의 용해도를 증가시키는 매우 효과적인 전처리 방법이며, 양돈폐수와 전처리된 음식물쓰레기의 혐기성 병합소화로 인하여 저해작용을 감소시키는 것으로 평가되었다.