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IR Correlation Spectroscopy using Microgratings to be Compared with Dispersive IR Spectroscopy#
신권수,조충만,최은우,김성규,김인철,박도현,강영일 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.3
Microgratings that were designed and fabricated to generate IR absorption spectra of SF6 and NH3 on diffraction into a specific detection angle were tested by correlation spectroscopy. The micrograting diffraction provides a reference spectrum for a target molecule, and its cross-correlation with the transmission spectrum of a gas cell is obtained by varying the diffraction angle. As our optical setup can measure the dispersive transmission spectrum and the correlation spectrum under the same conditions, the two kinds of spectra were compared directly in terms of signal-to-noise ratio (SNR). The SNR’s of the correlation spectra were a few times lower than those of the dispersed spectra; therefore, the correlation spectroscopy can hardly be placed above the dispersive spectroscopy with respect to the SNR. The merit of the correlation spectroscopy is that a rather small range of modulation wavelength is needed to identify the target. Therefore, the correlation spectroscopy would be more useful for such target molecules whose spectra consist of broad peaks spread throughout a wide wavelength range.
신권수,김지훈,김인현,김관 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.3
Hollow gold-silver bimetallic nanoparticles (AuAg-HNPs) have been synthesized and their optical and structural properties were characterized. Initially Ag nanoparticles (Ag-NPs) were prepared using poly(ethylenimine) (PEI) as a reducing and a stabilizing agent simultaneously. AuAg-HNPs could then be synthesized via galvanic replacement reaction in a PEI aqueous solution by reacting sacrificial Ag template with a precursor compound of Au, i.e., HAuCl4. Due to the presence of abundant amine functional groups in PEI, which could act as the dissolving ligand for AgCl, the precipitation problem of Ag+ in the presence of Cl from HAuCl4 salt was avoided. On this basis, the relatively high concentrations of HAuCl4 and PEI-stabilized Ag nanoparticles could be used for the fabrication of AuAg-HNPs. Because of their increased surface areas and reduced densities, the AuAg-HNPs were expected and confirmed to outperform their solid counterparts in applications such as catalysis for the reduction of 4-nitrophenol in the presence of NaBH4.
NH₃-O₂-Ar 혼합기체의 점화 과정에서 H₂기체의 첨가 효과에 관한 연구
신권수,배균택 崇實大學校 2000 論文集 Vol.30 No.1
The addition effect of H₂on ignition of NH₃-O₂-Ar mixtures was examined in the temperature range of 1521-2193 K and the pressures in the range of 0.86-1.78 bar behind reflected shock waves. The ignition delay times were measured by monitoring pressure profiles and the OH emissions at 1.0 cm from the end wall. To complement the experiment, computer modeling study of the ignition of NH₃-O₂-Ar mixtures was carried out using various mechanisms reported previously.
신권수,박기수,권은숙,Shin, Kuan-Soo,Park, Ki-Soo,Gwon, Eun-Sook 대한화학회 2004 대한화학회지 Vol.48 No.1
The ignition of ethanol-oxygen-argon mixture was studied in reflected shock waves over the temperature range of 1281-1625 K and the pressure range of 0.69-1.06 bar. The ignition delay time was measured by the sudden increase of pressure profile and the radiation emitted by OH radicals. The relationship between the ignition delay time and the concentrations of ethanol and oxygen was determined in the form of mass-action expressions with an Arrhenius temperature dependence. In contrast to the behavior observed in methanol, ethanol acts to inhibit rather than accelerate its own ignition. Several kinetic mechanisms proposed for ethanol oxidation at high temperatures have been tested by the computer simulation. 에탄올-산소-아르곤 혼합기체의 점화 과정을 반사 충격파를 이용 1281-1625 K의 온도 범위 및 0.69-1.06 bar 압력 범위에서 고찰하였다. 점화지연시간은 급격한 압력변화와 광 방출 스펙트럼으로부터 측정하였으며, 에탄올 및 산소 기체의 농도 그리고 반응온도에 따른 점화지연시간의 의존관계를 나타내는 실험식을 구할 수 있었다. 실험결과 에탄올 점화 과정에서 연료인 에탄올의 농도가 커지면 점화지연시간이 길어지는 경향을 보였으며, 이는 메탄올 점화 과정에서 메탄올의 농도가 증가하면 점화 과정이 짧아지는 것과는 다른 경향이었다. 그리고 에탄올 점화 과정에 관하여 보다 자세히 고찰하기 위해 다양한 에탄올 연소반응 메카니즘을 이용하여 모델 연구를 수행하였다.
염소계 탄화수소의 연소 억제 효과에 관한 반응속도 및 동력학 연구: $C_2H_6$ 점화 과정에서 $CH_3Cl$ 억제 효과
신권수,강위경,심승보,지성배,Shin, Kuan Su,Kang, Wee Kyung,Shim, Seung Bo,Jee, Sung Bae 대한화학회 1999 대한화학회지 Vol.43 No.2
소량의 $CH_3Cl$ 기체를 첨가한 $C_2H_6-O_2-Ar$ 혼합 기체의 점화 지연 시간을 반사 충격파 이후의 온도가 1270∼1544 K인 범위에서 측정하였다. 실험 결과 $CH_3Cl$ 기체가 $C_2H_6$ 기체의 점화 과정을 지연시킴을 알 수 있었고, $CH_3Cl$ 기체의 농도가 증가함에 따라 점화 지연 시간이 증가함을 알 수 있었다. 그리고 $C_2H_6-CH_3Cl-O_2-Ar$ 혼합 기체에서 $CH_3Cl$ 기체의 점화 억제 효과를 반응 메카니즘 시각으로 살펴보기 위하여 컴퓨터를 이용한 모의 실험을 수행하였다. The ignition delay times behind reflected shock waves in $C_2H_6-O_2-Ar$ systems containing $CH_3Cl$ were measured for the range of temperatures between 1270 and 1544 K. The measurements indicated that $CH_3Cl$ inhibited the ignition of ethane ignition and the inhibition effects increased with increasing $CH_3Cl$ concentration. To clarify the inhibition effects of $CH_3Cl$ from the viewpoint of the reaction mechanism, computational analyses were performed in $C_2H_6-CH_3CI-O_2-Ar$ mixtures.
신권수,Young Kwan Cho,Kyung Lock Kim,김관 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.3
In this work, we describe a very simple electroless deposition method to prepare moderate-SERS-active nanostructured Pd films deposited on the glass substrates. To the best of our knowledge, this is the first report on the one-pot electroless method to deposit Pd nanostructures on the glass substrates. This method only requires the incubation of negatively charged glass substrates in ethanol-water mixture solutions of Pd(NO3)2 and butylamine at elevated temperatures. Pd films are then formed exclusively and evenly on glass substrates. Due to the aggregated structures of Pd, the SERS spectra of benzenethiol and organic isonitrile could be clearly identified using the Pd-coated glass as a SERS substrate. This one-step fabrication method of Pd thin film on glass is cost-effective and suitable for the mass production.