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  • critical phenomena  (10)
  • Liquid chromatography  (7)
  • Graphitized carbon black  (5)
  • ( 125I) 3-deoxy-3-iodine glucose
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  • Springer  (23)
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  • 1
    Digitale Medien
    Digitale Medien
    Physico-chemical applications of liquid chromatography II. Investigations of the surface properties of chemically modified silica gels and of the adsorption of cardiac glycosides from solutions (1981)
    Springer
    Chromatographia 14 (1981), S. 13-18 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Chemical modification of silica ; Liquid chromatography ; Cardiac glycosides ; Chromatographic investigation of adsorption from solution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary The chemical modification of silica surface using dichlorosilanes with methyl and phenyl groups and triethylamine as donor in the liquid phase was investigated. This modification leads to a dense coverage of the silica surface by the organic functional groups. Liquid chromatography permits the determination of the thermodinamic characteristics of intermolecular interactions of different molecules during adsorption from solutions on the modified surface of the silica. Silica gels modified with dichlorosilanes containing phenyl groups, possess high selectivity (α) and capacity (k′) for the cardiac glycosides G-strophanthin, K-strophanthoside, K-strophanthin-β and cymarin using water-alcohol mixture as the mobile phase, and the selectivity and capacity is much higher than observed on silica gels modified with methyl groups only.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02262056
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  • 2
    Digitale Medien
    Digitale Medien
    Regularities in the retention of isomeric aromatic hydrocarbons in liquid chromatography II. Analysis of polymethyl- and monoalkylbenzenes on silanized silica gel (1981)
    Springer
    Chromatographia 14 (1981), S. 638-640 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Liquid chromatography ; Aromatic hydrocarbons ; Molecular structure ; Influence on retention
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary The regularities of the retention of polymethyl- and monoalkylbenzenes on a nonpolar adsorbent (silanized silica gel) with a polar eluent (2∶3 isopropanol-water) have been studied. In contrast to the retention of the same compounds on a polar adsorbent (silica gel with hydroxylated surface) and with a nonpolar eluent (hexane) polymethylbenzenes are retained on silanized silica gel for a shorter time than the corresponding monoalkylbenzene isomers. The retention order of tert.-, sec.- and n-butylbenzenes is the reverse of that observed on silica gel having a hydroxylated surface. The retention order of xylenes, trimethyl- and tetramethylbenzenes is also the reverse of their retention order on silica gel having a hydroxylated surface. All the mixtures of the corresponding homologues and isomers have been separated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02291103
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  • 3
    Digitale Medien
    Digitale Medien
    Retention of diphenyls, terphenyls, phenylalkanes and fluorene on graphitized thermal carbon black (1981)
    Springer
    Chromatographia 14 (1981), S. 510-514 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Gas-solid chromatography ; Graphitized carbon black ; Aromatic hydrocarbons
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary This paper defines values of retention volumes for zero surface coverage (Henry's constant) at different temperatures, retention indices and variations of the internal energy (differential heats of adsorption) of diphenyl and its alkyl derivatives, terphenyls, diphenylmethane, triphenylmethane, diphenylethanes and fluorene on graphitized thermal carbon black (GTCB). Adsorption on GTCB takes place in accordance with the geometry of these molecules, the strongest adsorption being observed for para-terphenyl with least inhibited internal rotation of the molecule, while the weakest adsorption occurs for 2,6,2′,6′-tetramethyldiphenyl with the most inhibited internal rotation of the molecules. The flat molecules of fluorene are adsorbed on GTCB more readily than the nonflat molecules of diphenylmethane.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02265630
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  • 4
    Digitale Medien
    Digitale Medien
    Intermolecular interactions in liquid adsorption chromatography (1983)
    Springer
    Chromatographia 17 (1983), S. 143-148 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Liquid chromatography ; Intermolecular interactions ; Adsorption from solutions ; Chemically modified layers in LC ; Conformation of bonded chains
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary For the investigation of intermolecular interactions in adsorption from solution, which are the basis of selectivity in molecular liquid chromatography (LC), it is convenient to use the LC method itself. Using this method the Henry's constants, K1, and other thermodynamic adsorption characteristics of hydrocarbons and of a series of polar substances on hydroxylated silica surface were determined from aqueous solutions. On the basis of the adsorption of hydrocarbons from water solutions the structure of the chemically modifying layers formed by different hydrocarbon groups on the silica surface is considered. The role of conformation ability of straight-chain bonded phases is demonstrated. Hydrocarbons are adsorbed on the hydroxylated silica surface more strongly from aqueous solutions than from solutions in saturated hydrocarbons and their retention increases with the increase in the number of carbon atoms in the molecule. The retention in LC is determined by the intermolecular interaction of the solute and solvent molecules with the adsorbent, as well by the contribution of the intermolecular interaction, between the solute and the solvent. The thermodynamic characteristics of adsorption of cymarin from water-ethanol solutions on hydroxylated silica gel and on silica gel surface modified by diphenylsilyl groups is compared. The solubility of silica gel modified by diphenylsilyl groups at different composition of water-ethanol eluent at different temperatures is investigated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02271037
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  • 5
    Digitale Medien
    Digitale Medien
    Gas chromatography-mass spectrometry of the stereoisomers of perhydroanthracene and perhydrophenanthrene (1984)
    Springer
    Chromatographia 18 (1984), S. 297-304 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Gas Chromatography-Mass Spectrometry ; Isomers of perhydroanthracene and perhydrophenanthrene ; Low energy mass spectra ; Graphitized carbon black
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A gas chromatographic-mass spectrometric study of a mixture of the stereoisomers of perhydroanthracene (PHA) and perhydrophenanthrene (PHP) has been carried out. Separation was accomplished on capillary columns filled with graphitized thermal carbon black. The stereospecific features of the fragments of PHA and PHP are related, in particular, to the intramolecular repulsion of the H...H pairs of the side rings and evidently arise from the low energy of the ionizing electrons. The effect of this interaction is more clearly shown in the fragmentation of PHP, which is related to the angular disposition of the side rings, and which decreases as the structure of the isomers of the molecules becomes flatter. The predominant fragmentation paths, leading to a reduction in tension, arising from the intramolecular repulsion of the H...H pairs, are different for PHA and PHP. The fragmentation of PHA is characterized by the preferred rupture of the bonds of the side rings, while the fragmentation of PHP proceeds through the rupture of the bonds of the middle ring.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02259081
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  • 6
    Digitale Medien
    Digitale Medien
    Crossover equation of state for the thermodynamic properties of mixtures of methane and ethane in the critical region (1996)
    Springer
    International journal of thermophysics 17 (1996), S. 909-944 
    Details
    ISSN: 1572-9567
    Schlagwort(e): critical phenomena ; equation of state ; ethane ; methane ; plait point ; thermodynamic properties
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We present an equation of state for the thermodynamic properties of mixtures of methane and ethane in the critical region that incorporates the crossover from singular thermodynamic behavior near the locus of vapor-liquid critical points to regular thermodynamic behavior outside the critical region. The equation of state yields a satisfactory representation of the thermodynamic-property data for the mixtures in a large range of temperatures and densities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01439196
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  • 7
    Digitale Medien
    Digitale Medien
    Thermodynamic behavior of mixtures of methane and ethane in the critical region (1993)
    Springer
    International journal of thermophysics 14 (1993), S. 1187-1200 
    Details
    ISSN: 1572-9567
    Schlagwort(e): binary mixtures ; critical phenomena ; equation of state ; ethane ; methane ; plait point ; specific heat
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract An isomorphic equation of state for near-critical binary mixtures is used to represent equation of state and specific heat data for mixtures of methane and ethane in a substantial range of densities and temperatures around the critical line.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00503681
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  • 8
    Digitale Medien
    Digitale Medien
    Thermodynamic behavior of mixtures of methane and ethane in the critical region (1993)
    Springer
    International journal of thermophysics 14 (1993), S. 1187-1200 
    Details
    ISSN: 1572-9567
    Schlagwort(e): binary mixtures ; critical phenomena ; equation of state ; ethane ; methane ; plait point ; specific heat
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract An isomorphic equation of state for near-critical binary mixtures is used to represent equation of state and specific heat data for mixtures of methane and ethane in a substantial range of densities and temperatures around the critical line.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02431283
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  • 9
    Digitale Medien
    Digitale Medien
    Experimental and theoretical studies of the crossover behavior of the specific heat Cv,x of ethane, propane, and their mixture at critical isochores (1996)
    Springer
    International journal of thermophysics 17 (1996), S. 423-440 
    Details
    ISSN: 1572-9567
    Schlagwort(e): critical phenomena ; crossover equation ; ethane ; propane ; specific heat
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The specific heat at constant volume, Cv, of propane, and mixture with a concentration ofx=0.0081 cool fraction of propane was measured along the critical isochores at temperatures between 290 and 400 K. The measurements were performed with a high-temperature constant-volume adiabatic calorimeter. The uncertainty of most of the measurements is estimated to be less than 1.5%. Measurements have been carried out in both the one- and two-phase regions. The results for the pure components are compared with earlier measurements. Crossover equations forC, obtained on the basis of the renormalization-group method and ɛ-expansion are applied to represent our experimental specific heat data for ethane, propane. and its mixture along the critical isochores.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01443401
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  • 10
    Digitale Medien
    Digitale Medien
    A scaled equation of state for real fluids in the critical region (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 465-481 
    Details
    ISSN: 1572-9567
    Schlagwort(e): critical phenomena ; equation of state ; scaling laws ; steam ; thermodynamic properties
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A scaled equation of state is proposed for real fluids in the critical region which incorporates asymmetry with respect to the critical isochore. In the range of reduced densities 0.65⩽(θ/θ c)⩽1.4 and for reduced temperatures (T/T c)⩽1.2, the equation represents P-V-T data for steam within the experimental accuracy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00508891
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