Results 171 to 180 of about 5,893 (200)
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The characterization of nitrogen-enriched activated carbons by IR, XPS and LSER methods
Carbon, 2002The aim of this work is to study the efficiency of the nitrogen enrichment by urea of lignites and the induced changes of the adsorptive properties towards volatile organic compounds (VOCs) of the activated carbons derived from these modified precursors.
Philippe Burg +5 more
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Journal of Chromatography A, 2018
Linear solvation energy relationships (LSERs) were applied to retention on hypercrosslinked polystyrene on silica (HC-Tol) to elucidate the type and relative importance of molecular interactions between model solutes and the HC-Tol stationary phase. Classical amino phase and another hypercrosslinked phase (5-HGN) were used as reference columns. On both
Di, Wu, Ping, Jiang, Charles A, Lucy
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Linear solvation energy relationships (LSERs) were applied to retention on hypercrosslinked polystyrene on silica (HC-Tol) to elucidate the type and relative importance of molecular interactions between model solutes and the HC-Tol stationary phase. Classical amino phase and another hypercrosslinked phase (5-HGN) were used as reference columns. On both
Di, Wu, Ping, Jiang, Charles A, Lucy
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Fluid Phase Equilibria, 2005
Abstract It has been shown before that all kinds of equilibrium partition data can be described by Abraham's LSER equations. Two types of LSER equations are used, one for liquid–liquid and one for liquid–air partitioning. Here it is suggested that one LSER equation with a different combination of descriptors can replace the two equations that have ...
exaly +2 more sources
Abstract It has been shown before that all kinds of equilibrium partition data can be described by Abraham's LSER equations. Two types of LSER equations are used, one for liquid–liquid and one for liquid–air partitioning. Here it is suggested that one LSER equation with a different combination of descriptors can replace the two equations that have ...
exaly +2 more sources
Journal of Industrial and Engineering Chemistry, 2012
Abstract Reactive extraction can be used for the recovery of carboxylic acids from fermentation broth. Through the formation of complex with extractants at the two-phase interface, the carboxylic acids are partitioned into organic solvents. But, the recovery of carboxylic acids is interrupted by the conditions of fermentation broth.
Ismail Inci +2 more
exaly +2 more sources
Abstract Reactive extraction can be used for the recovery of carboxylic acids from fermentation broth. Through the formation of complex with extractants at the two-phase interface, the carboxylic acids are partitioned into organic solvents. But, the recovery of carboxylic acids is interrupted by the conditions of fermentation broth.
Ismail Inci +2 more
exaly +2 more sources
Fluid Phase Equilibria, 2006
Abstract Solute descriptors of linear solvation energy relationship (LSER) for dialkyl ethers were examined as a means for improving predictions of their fate and behavior in the environment. LSER solute descriptors consist of the excess molar refraction, the polarizability/dipolarity parameter, the effective hydrogen (H)-bond acidity/basicity ...
Endo, Satoshi, Schmidt, Torsten Claus
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Abstract Solute descriptors of linear solvation energy relationship (LSER) for dialkyl ethers were examined as a means for improving predictions of their fate and behavior in the environment. LSER solute descriptors consist of the excess molar refraction, the polarizability/dipolarity parameter, the effective hydrogen (H)-bond acidity/basicity ...
Endo, Satoshi, Schmidt, Torsten Claus
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Evaluation of column characteristics in RPLC using linear solvation energy relationships (LSERs)
Journal of Separation Science, 2003AbstractAn overview is given of our studies on the use of linear solvation energy relationships (LSERs) for evaluation and comparison of RP‐HPLC columns. From among the columns investigated, 19 columns of different types, viz. 12 narrow‐pore, 7 wide‐pore silicas containing various ligands (C18, C8, C4, CN) and obtained from 7 manufacturers, were ...
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Chromatographia, 2012
A mixture of 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetraethoxycarbonylmethyloxy calix[4]arene (C[4]TECM) and 1-octyl-3-methylimidazolium tetrafluoroborate ionic liquid (OmI m + BF4 −) has been employed as stationary phases in capillary gas chromatography.
Jie-hua Shi, Qian-qian Jia, Shui-xing Xu
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A mixture of 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetraethoxycarbonylmethyloxy calix[4]arene (C[4]TECM) and 1-octyl-3-methylimidazolium tetrafluoroborate ionic liquid (OmI m + BF4 −) has been employed as stationary phases in capillary gas chromatography.
Jie-hua Shi, Qian-qian Jia, Shui-xing Xu
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Analytical and Bioanalytical Chemistry, 2014
The separation properties of six novel stationary phases for gas chromatography, commercially available from Sigma-Aldrich (Supelco) and based on ionic liquids (ILs), were investigated. The linear solvation energy relationship model (LSER) was used to describe the molecular interactions between these stationary phases and 30 solutes. The solutes belong
Waldemar, Weber, Jan T, Andersson
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The separation properties of six novel stationary phases for gas chromatography, commercially available from Sigma-Aldrich (Supelco) and based on ionic liquids (ILs), were investigated. The linear solvation energy relationship model (LSER) was used to describe the molecular interactions between these stationary phases and 30 solutes. The solutes belong
Waldemar, Weber, Jan T, Andersson
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Chromatographia, 2003
The capacity factorsk of 28 polycromatic hydrocarbons (PAHs) were determined by micellarliquid chromatography (CLM) in several mobiles phases containing anionic (SDS), cationic (CTAB), or non-ionic(Brij 35) surfactants. The micelle-water binding constantsK MW were calculated via the Armstrong theory. Linear solvation energy relationship
F. Mutelet +2 more
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The capacity factorsk of 28 polycromatic hydrocarbons (PAHs) were determined by micellarliquid chromatography (CLM) in several mobiles phases containing anionic (SDS), cationic (CTAB), or non-ionic(Brij 35) surfactants. The micelle-water binding constantsK MW were calculated via the Armstrong theory. Linear solvation energy relationship
F. Mutelet +2 more
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Journal of Chromatography A, 2011
This study examines the effect of temperature on the dynamic cholesterol coating of a C18 stationary phase and the effect of this coating on the retention mechanism. In general, an increase in temperature results in a decrease in the mass of cholesterol coated on the stationary phase. Typically, an increase in temperature from 25°C to 55°C results in a
Phillip B, Ogden, Jason W, Coym
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This study examines the effect of temperature on the dynamic cholesterol coating of a C18 stationary phase and the effect of this coating on the retention mechanism. In general, an increase in temperature results in a decrease in the mass of cholesterol coated on the stationary phase. Typically, an increase in temperature from 25°C to 55°C results in a
Phillip B, Ogden, Jason W, Coym
exaly +3 more sources