A kinetic study of the gas-phase reaction between the hydroxyl radical and atomic mercury
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Mercury
Hydroxyl radical
Degradation
Strain (injury)
Biofilter
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액상유기수소운반체(liquid organic hydrogen carrier, LOHC)는 액상 형태로 수소를 효율적으로 저장 및 방출할 수 있는 물질로서 미래 수소경제 활성화에 있어서 효과적 수소 저장 물질로 주목받고 있다. 그 중 1,2-BN-cyclohexane 물질은 열역학적으로 안정하며 상온에서의 탈수소화 반응 시 휘발성 오염물질을 방출하지 않는 장점을 가지고 있다. 본 연구에서는 밀도범함수이론(density functional theory, DFT) 계산을 활용하여 1,2-BN-cyclohexane 물질에 기능기 F 및 NH2를 치환하여 더 향상된 가역적 수소 저장 물질로서의 가능성을 평가하고자 하였다. 1,2-BN-cyclohexane 물질의 탈수소화 ∆G는 ‒5.71 kJ/mol인 반면, F-BN-cyclohexane과 NH2-BN-cyclohexane의 탈수소화 ∆G는 각각 ‒4.10과 ‒5.38 kJ/mol으로 나타났다. 탈수소화 ∆G 값이 0 (zero)에 가까울수록 더 가역적인 탈수소화-수소화 반응임을 고려할 때, F와 NH2 기능기로써 치환된 BN-cyclohexane 물질의 가역성이 기존 물질보다 더 향상될 수 있음을 보여주었다. 본 밀도범함수이론(DFT) 연구는 기존 BN-cyclohexane 물질에서 F와 NH2 기능기를 치환함에 따라 향상될 수 있는 탈수소화-수소화 가역적 반응성을 평가하는 체계적 방법론을 제시할 뿐만 아니라, 기존 BN-cyclohexane 물질보다 더 향상된 탈수소화-수소화 반응 가역성을 나타낼 수 있는F-BN-cyclohexane 물질의 제안과 반응 메커니즘에 대한 자세한 정보를 제공해준다.
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The general goals of this research project are (1) to synthesize novel bimetallic clusters in the gas phase; (2) to characterize their geometry, electronic structure, and chemical bonding; and (3) to compare these heterogeneous systems to corresponding pure component clusters. Clusters are synthesized by pulsed laser vaporization of solid metal rods coincident with laser photolysis of volatile metal complexes (e.g., metal carbonyls). Two techniques are used to characterize cluster properties: resonant two-photon ionization spectroscopy (R2PI) of neutral clusters and laser photodissociation spectroscopy of cluster ions. The project focuses on the selected mixtures of iron, chromium, and molybdenum with bismuth, aluminum and silver to probe a variety of heterogeneous effects in transition metal-main group metal mixtures.
Bimetallic strip
Bismuth
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Objective:To establish a method for the simultaneous determination of Cyclohexane and Methyl Cyclohexane in the air of workplace by Gas chromatography.Methods:Cyclohexane and Methyl Cyclohexane in the air of workplace were collected with charcoal tube,then injected after being desorbed with carbon disulfide,through 5% SE-30 glass column(2 m×4 mm) with constant temperature,detected by FID.Results:Retention time of Cyclohexane and Methyl Cyclohexane were 2.514 min,3.609 min.The linearity ranges were 8 μg/ml～389 μg/ml,8 μg/ml～385 μg/ml.The limits of detection were both 8 μg/ml.The coefficient of correlation were 0.9999,0.9999.Conclusion:The method is suitable to determine Cyclohexane and Methyl Cyclohexane in the air of workplace simultaneously.
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Researching the recovery methods of cyclohexane in the mixture of naphthalene-cyclohexane in physical chemistry experiment.A comparison between getting cyclohexane by simply distillation then rectification and getting cyclohexane by direct rectification showed that the later had shorter recovery time,higher efficiency,and the purity of cyclohexane was satisfied with the requirements of experiments.
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Optical studies as a function of temperature have been conducted on two liquid crystalline mixtures: Mixture 1: containing phenyl cyclohexane, biphenyl cyclohexane and cyclohexane carboxylate (Code Name: ZLI 1701); Mixture 2: containing phenyl cyclohexane, cyano cyclohexane and cyclohexane carboxylate. (Code Name: ZLI 1800-000). Each of the mixtures exhibits only the nematic phase and has similar temperature ranges for the same. Both the mixtures contain phenyl cyclohexane and cyclohexane carboxylate groups. However, mixture 1 contains biphenyl cyclohexane whereas mixture 2 contains cyano cyclohexane. Untill now no systematic study on the optical properties of the two mixtures have been reported. Our interest is to compare the macroscopic properties of the two mesogenic mixtures and to study the effect of replacing the biphenyl cyclohexane group in mixture 1 by cyano cyclohexane group in mixture 2. With this aim in view the variation of the refractive indices with temperature has been determined for both samples. We have also determined the thermal dependence of the orientational order parameter of the two mixtures from the optical studies.
Mesogen
Biphenyl
Carboxylate
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X-ray diffraction patterns have been made of benzene, cyclohexane, and three mixtures. The first strong peak of the mixtures is a single peak showing no trace of resolution into a benzene peak and a cyclohexane peak. If benzene-cyclohexane mixtures have an emulsion type of structure, such as postulated by H. K. Ward, the separation of the benzene and cyclohexane peaks is too small, relative to the peak widths, to allow the two component peaks to be distinguished. X-ray studies of benzene-cyclohexane mixtures can neither prove nor disprove the existence of an emulsion type of structure in the mixture.
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Section (typography)
White (mutation)
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Vapor phase
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