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  • 1
    Electronic Resource
    Electronic Resource
    Measurements of isobaric heat capacities of gases from 323.15 to 573.15 K up to 30 MPa (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 3263-3267 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A Setaram C-80 calorimeter has been modified in order to measure heat capacities at constant pressure of gases from ambient temperature to 573 K and at pressures up to 30 MPa. Special cells have been designed and an additional device has been incorporated into the calorimeter to better control the temperature. The calorimetric technique and the calibration method are described. Experimental heat capacities of CO2 in the temperature range 323.15–423.15 K at pressures up to 25 MPa are reported and compared with the best literature data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144560
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  • 2
    Electronic Resource
    Electronic Resource
    Thermodynamics of binary mixtures containing alkynes (1978)
    Springer
    Monatshefte für Chemie 109 (1978), S. 235-243 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Molar excess enthalpiesH E of 1-hexyne +n-heptane, +n-decane, +cyclohexane, and +benzene, and of 3-hexyne +n-heptane, +n-decane, +cyclohexane, and +benzene, at 298.15 K and atmospheric pressure were measured with a Picker type flow microcalorimeter. Generally, the 1-hexyne systems are more endothermic than the corresponding 3-hexyne systems, the increment ofH mas E being of the order of 170 to 260 J/mol, which is clearly too large to be accounted for by orientational contributions toH E due to the permanent dipole moment of 1-hexyne. It is suggested that other contributions, for example contributions resulting from different conformational behavior of the hexynes, have to be considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00911966
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of excess volumes in 1,2-dichloroethane + benzene, + toluene, + p-xylene, + cyclohexane, and + methylcyclohexane with a vibrating-tube densimeter (1978)
    Springer
    Monatshefte für Chemie 109 (1978), S. 369-374 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Densities of mixtures of 1,2-dichloroethane + benzene, + toluene, + p-xylene, + cyclohexane, and + methylcyclohexane were measured at 298.15 K over the whole concentration range by means of a vibrating-tube densimeter. Molar excess volumes were calculated from the results and compared to values obtained by interpolation or extrapolation of literature data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00906354
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  • 4
    Electronic Resource
    Electronic Resource
    Thermodynamics of binary mixtures containing alkynes. II (1978)
    Springer
    Monatshefte für Chemie 109 (1978), S. 435-442 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die molaren ZusatzenthalpienH E der sechs binären Systeme 1-Hexin + CCl4, + Dipropyläther, + Triäthylamin, und 3-Hexin + CCl4, + Dipropyläther, + Triäthylamin wurden bei 298,15 K und Atmosphärendruck über den gesamten Konzentrationsbereich mit einem dynamischen Strömungsmikrokalorimeter nachPicker gemessen.H E des Systems 3-Hexin + CCl4 ist starkexotherm (−499 J mol−1 fürx=0,5),H E des Systems 1-Hexin + CCl4 endotherm (+14 J mol−1,x=0,5). Hingegen verhalten sich die Mischungen Hexin + Dipropyläther bzw. + Triäthylamin den Erwartungen entsprechend. Wegen des aktiven Wasserstoffs endständiger Alkine ist die Zusatzenthalpie mit 1-Hexin stärker exotherm (−185 J mol−1 mit Dipropyläther und −300 J mol−1 mit Triäthylamin,x=0,5) als mit 3-Hexin (−25 J mol−1 bzw. −92 J mol−1). Die molare Zusatzenthalpie des Systems 3-Hexin (x 1) + Triäthylamin ist ausgeprägt asymmetrisch mit einem Minimum von etwa −197 J mol−1 beix 1≈0,9.
    Notes: Abstract Molar excess enthalpiesH E of 1-hexyne + carbon tetrachloride, + dipropyl ether, + triethylamine, and of 3-hexyne + carbon tetrachloride, + dipropyl ether, + triethylamine at 298.15 K and atmospheric pressure were measured with aPicker-type flow microcalorimeter over the whole concentration range. At equimolar concentration,H E of 3-hexyne + carbon tetrachloride is stronglyexothermic (−499 J mol−1), in contrast toH E =+14 J mol−1 for the 1-hexyne system. As expected, for the ether and amine systems inverse behavior is observed: because of the active hydrogen of terminal alkynes the enthalpy of mixing at equimolar concentration is more exothermic with 1-hexyne (−185 J mol−1, dipropyl ether; −300 J mol−1, triethylamine) than with 3-hexyne (−25 J mol−1, dipropyl ether; −92 J mol−1, triethylamine). The curveH E vs. mole fraction is considerably skewed for 3-hexyne (x 1) + triethylamine, the minimum being ca. −197 J mol−1 atx 1≈0.9.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00906361
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  • 5
    Electronic Resource
    Electronic Resource
    Thermodynamics of liquid mixtures containing hydrocarbons and strongly polar substances:V E andC P E of {pyridine or piperidine+cyclohexane} at 298.15 K (1994)
    Springer
    Monatshefte für Chemie 125 (1994), S. 877-885 
    Details
    ISSN: 1434-4475
    Keywords: Thermodynamics ; Excess molar volume ; Excess molar heat capacity ; Liquid mixtures ; Density ; Calorimetry ; Pyridine ; Piperidine ; Cyclohexane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Für die beiden flüssigen Mischungen {Pyridin oder Piperidin+Cyclohexan} wurden molare ZusatzvoluminaV E und molare ZusatzwärmekapazitätenC P E bei konstantem Druck als Funktion des Molenbruchsx 1 bei 298.15K bestimmt. Die Messungen wurden mit einem Biegeschwinger-Dichtemeßgerät bzw. einem Strömungsmikrokalorimeter nach Picker durchgeführt. Die Zusatzmolvolumina beider Systeme sind positiv mitV E(x 1=0.5)=0.531 cm3·mol−1 für {Pyridin+Cyclohexan} und 0.295 cm3·mol−1 für {Piperidin+Cyclohexan}. Die KurveC P E vs. x 1 des Systems {Pyridin+Cyclohexan} zeigt einen ungewöhnlichen S-förmigen Verlauf: bei kleinen Molenbrüchenx 1 von Pyridin istC P E negativ, fürx 1〉0.22 istC P E positiv. Die molare Zusatzwärmekapazität des Piperidinsystems ist überall negativ und stark unsymmetrisch: im Minimum beix 1,min≈0.27 findet manC P E (x 1,min)=−2.32J·K−1·mol−1.
    Notes: Summary Excess molar volumesV E and excess molar heat capacitiesC P E at constant pressure have been determined, as a function of mole fractionx 1 at 298.15 K and atmospheric pressure, for the two liquid mixtures {pyridine or piperidine+cyclohexane}. The instruments used were a vibrating-tube densimeter and a Picker flow microcalorimeter, respectively. The two systems show positive excess volumes withV E(x 1=0.5)=0.531 cm3·mol−1 for {pyridine+cyclohexane} and 0.295 cm3·mol−1 for {piperidine+cyclohexane}. The curveC P E vs. x 1 for {pyridine+cyclohexane} shows a rather complex S-shape:C P E is negative at small mole fractionsx 1 of pyridine and positive forx 1〉0.22, roughly.C P E of the piperidine system is negative throughout and strongly asymmetric with the minimumC P E (x 1,min)=−2.32J·K−1·mol−1 being situated at a mole fraction of piperidinex 1,min≈0.27.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00812701
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  • 6
    Electronic Resource
    Electronic Resource
    Thermal expansivities ofn-hexane,n-hexanol and their mixtures over the temperature range from 303 K to 503 K at pressures up to 400 MPa (1992)
    Springer
    Journal of thermal analysis and calorimetry 38 (1992), S. 1959-1963 
    Details
    ISSN: 1572-8943
    Keywords: pressure-controlled scanning calorimeter ; thermal expansivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung In einem druckkontrollierten Scanning-Kalorimeter wurden bei Drücken bis zu 400 MPa bei 303 K, 353 K, 403 K, 453 K und 503 K die isobare Wärmeausdehnung vonn-Hexanol und seiner binären Gemische mitn-Hexan gemessen. Sowohl bein-Hexanol als auch bei seinen Gemischen mitn-Hexan wurde ein regulärer Schnittpunkt der Isothermen der Wärmeausdehnung gefunden. Der Druck, bei dem der Schnittpunkt auftritt, steigt mit zunehmenden Gehalt ann-Hexanol.
    Notes: Abstract The isobaric thermal expansivities ofn-hexanol and of its binary mixtures withn-hexane have been measured in a pressure-controlled scanning calorimeter at 303 K, 353 K, 403 K, 453 K and 503 K under pressures up to 400 MPa. In both then-hexanol and its mixtures withn-hexane a regular crossing point of isotherms of thermal expansivities was observed. The value of pressure at which the crossing appeared increased with the increasing amount ofn-hexane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979605
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  • 7
    Electronic Resource
    Electronic Resource
    Apparent molar volumes, heat capacities, and molecular excluded volumes of methylated, hydroxy and methoxy derivatives of 1-methylcytosine in aqueous solutions at 25°C (1996)
    Springer
    Journal of solution chemistry 25 (1996), S. 529-539 
    Details
    ISSN: 1572-8927
    Keywords: Derivatives of cytosine ; apparent molar heat capacities ; apparent molar volumes ; molecular excluded volumes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Densities and specific heat capacities of aqueous solutions: 1-methylcytosine; 1-methyl-N4-hydroxycytosine; 1,5-dimethylcytosine; I,N4-dimethylcytosine; 1,5-dimethyl-N4-hydroxycytosine; 1-methyl-N4-methoxycytosine; 1,N4,N4-trimethylcytosine, 1,5-dimethyl-N4-methoxycytosine were determined using flow calorimetry and flow densimetry at 25°C. Apparent molar volumes and heat capacities were then determined. Molecular excluded volumes were evaluated. A relationship was found between the values of the increments in partial molar values and the kind of groups substituted. Four types of contributions were distinguished: substitution of hydrogen on C, N, and O (in OH group on N4) atoms by CH3 group and replacement of hydrogen on N4 atom by OH group. The correlation between the experimental partial molar volumes and calculated molecular excluded volumes was also elaborated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00973083
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  • 8
    Electronic Resource
    Electronic Resource
    Measurements of excess enthalpies at high temperature and pressure using a new type of mixing unit (1994)
    Springer
    Journal of solution chemistry 23 (1994), S. 1161-1182 
    Details
    ISSN: 1572-8927
    Keywords: Heat of mixing ; excess enthalpy ; flow calorimetry ; high temperature ; high pressure ; ethanol ; water ; carbon dioxide ; toluene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A flow mixing unit (calorimetric cell and auxiliary devices) has been designed for measuring the enthalpy of mixing or reaction of two fluids (gas+liquid or liquid+liquid). The indicator of the heat effect is a differential heat flux calorimeter, SETARAM C-80, allowing measurements at temperatures up to 300°C. The mixing cell is made of a stainless-steel capillary (o.d 1.6 mm, length 2.4m) which is coiled in a cylindrical form and tightly fitted in the thermopile well of the calorimeter. The fluids are delivered from the high pressure piston pumps and circulated through the system at controlled flow rates ranging from 100 to 1500 μL-min−1. The tests were carried out at pressures up to 20 MPa. Special care was taken to allow good thermostatting of fluids entering the mixing cell. Check measurements were made with one liquid-liquid system (C2H5OH+H2O) and one gas-liquid system (CO2+C6H5CH3); our enthalpies of mixing agreed with the literature values in most cases to 2%. For the system ethanol+water the experiments have been also performed at temperature of 250°C and pressures of 15 and 20 MPa. The endothermal mixing effect was higher than expected indicating an increase in the excess heat capacity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00974028
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  • 9
    Electronic Resource
    Electronic Resource
    Estimation of DISQUAC interaction parameters for low molecular mass analogues of polymers: Chloroalkane + ester mixtures (1994)
    Springer
    Journal of solution chemistry 23 (1994), S. 135-152 
    Details
    ISSN: 1572-8927
    Keywords: Chloroalkanes ; esters ; group-contribution ; DISQUAC group-contribution model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Literature data for vapor-liquid equilibria, activity coefficients at infinite dilution and enthalpies of mixing of 1-chloroalkanes or α,ω-dichloroalkanes + alkyl alkanoates were examined on the basis of the DISQUAC group-contribution model. The interaction parameters for the COO/CI contacts are reported. The quasi-chemical parameters of 1-chloroalkane or long chain α,ω-dichloroalkanes are zero but become increasingly negative for short chain α,ω-dichloroalkanes. The model provides a fairly consistent description of the experiment data. The properties of many other systems can be predicted using the same set of parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00973542
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  • 10
    Electronic Resource
    Electronic Resource
    Heat capacities and densities of mixtures of very polar substances. 3. Mixtures containing either trichloromethane or 1,4-dioxane or diisopropylether (1994)
    Springer
    Journal of solution chemistry 23 (1994), S. 153-166 
    Details
    ISSN: 1572-8927
    Keywords: Heat capacity ; density ; excess volume ; trichloromethane ; 1,4-dioxane ; diisopropyl ether
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Excess molar heat capacities C P E at constant pressure and excess molar volumes V E have been determined, as a function of mole fraction x1 at 25°C and atmospheric pressure, for 10 binary liquid mixtures containing either trichloromethane (series I) with C6H5CH3, or C6H5Cl, or C5H5N, or CH3COCH3, or C6H5NO2; 1,4-dioxane (series II) with (C2H5)3N, or (CH3)2CHOCH(CH3)2, or (CH3 2SO); or diisopropyl ether (di-1-methylethyl ether) (series III) with (C2H5)3N, or CHCl3. The dipole momentsp (10−30C-m) of the substances range from nearly 0 to 14.1 for nitrobenzene. The C P E of series I and III are all positive, with C P E (x1=0.5) (J-K−1-mol−1) ranging from 1.04 for {x1CHCl3+x2C6H5Cl} to 16.66 for {x1(CH3)2CHOCH(CH3)2+x2CHCl3}. In series II, the C P E are positive and small for {x11,4-C4H8O2+x2(CH3)2CHOCH(CH3)2}, S-shaped and small for {x11,4-C4H8O2+x2(C2H5)3N}, and negative and small for {x11,4-C4H8O2+x2(CH3)2SO}. The excess volumes are small and positive for {x1CHCl3+x2C6H5CH3}, S-shaped for {x1CHCl3+x2CH3COCH3}, {x11,4-C4H8O2+x2(C2H5)3N} and {x1(CH3)2CHOCH(CH3)2+x2(C2H5)3N}, and negative for the other systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00973543
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