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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 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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  • 3
    Electronic Resource
    Electronic Resource
    Apparent molar heat capacities and volumes, van der Waals volumes and accessible surface areas of alkylated derivatives of cytosine and uracil in aqueous solutions at 25°C. (1993)
    Springer
    Journal of solution chemistry 22 (1993), S. 907-918 
    Details
    ISSN: 1572-8927
    Keywords: Nucleic acid bases ; uracil ; cytosine ; apparent molar heat capacities ; apparent molar volumes ; van der Waals volumes ; accessible surface areas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Densities and specific heat capacities of aqueous solutions: 1,3,5,6-tetramethyluracil, 1,6-dimethyl-3-ethyluracil, 1,6-dimethyl-3-propyluracil, 1,6-dimethyl-3-butyluracil, 1,N4-trimethylcytosine, 1,N4-dimethyl-5-ethylcytosine, 1,N4 dimethyl-5-propylcytosine, 1,N4-dimethyl-5-butylcytosine were determined using flow calorimetry and flow densimetry at 25°C. Apparent molar volumes and heat capacities, van der Waals volumes and accessible surface areas were determined. It was stated that for alkylcytosines and alkyluracils partial molar volumes and heat capacities correlate linearly with the number of substituted methylene groups-CH2-as well as with the van der Waals volumes and accessible surface areas of the compounds studied; for cyclooligouracils the cyclization effect was discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646602
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  • 4
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    n-hexane as a model for compressed simple liquids (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 415-441 
    Details
    ISSN: 1572-9567
    Keywords: n-hexane ; isobaric thermal expansivities ; pressure-controlled scanning calorimetry ; saturated vapor pressure ; specific volume ; heat capacityisothermal compressibility ; thermal coefficient of pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Isobaric thermal expansivities, αp, ofn-hexane have been measured by pressure-controlled scanning calorimetry from just above the saturation vapor pressure to 40 MPa at temperatures from 303 to 453 K and to 300 MPa at 503 K. These new data are combined with literature data to obtain a correlation equation for αp valid from 240 to 503 K at pressures up to 700 MPa. Correlation equations are developed for the saturated vapor pressure, specific volume, and isobaric heat capacity of liquid n-hexane from 240 to 503 K. Calculated volumes, isobaric and isochoric specific heat capacities. isothermal compressibilities, and thermal coefficients of pressure are presented for the entire range of pressure and temperature. The pressure-temperature behavior of these quantities is discussed as a model behavior for simple liquids without strong intermolecular interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01563706
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  • 7
    Electronic Resource
    Electronic Resource
    Experimental Measurements of the Speed of Sound in n-Hexane from 293 to 373 K and up to 150 MPa (1998)
    Springer
    International journal of thermophysics 19 (1998), S. 145-160 
    Details
    ISSN: 1572-9567
    Keywords: compressibility ; hexane ; pressure ; speed-of-sound ; ultrasonic velocity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Speed-of-sound measurements were performed at pressures up to 150 MPa in the temperature range from 293 to 373 K on n-hexane in the liquid state. Theses data were then used to evaluate the isentropic and isothermal compressibility in the same range of pressures and temperatures. The speed-of-sound measurements, as well as the related compressibility coefficients, compare very well with the values calculated from the correlation of Randzio et al. Volumetric properties also compare very well with the direct measurements reported in the standard reference data tables.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021403219658
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  • 8
    Electronic Resource
    Electronic Resource
    Molecular Interactions of Macrocycles with Dipeptides in Aqueous Solutions. Partial Molar Volumes and Heat Capacities of Transfer of a Chiral 18-Crown-6 and of a Calix[4]resorcinarene Derivative from Water to Aqueous Dipeptide Solutions at 25°C (1998)
    Springer
    Journal of solution chemistry 27 (1998), S. 121-134 
    Details
    ISSN: 1572-8927
    Keywords: Partial molar volumes ; partial molar heat capacities ; D-α-manno-naphtho-18-crown-6-ether ; calix[4]resorcinarene ; Peptides: Ala–Ala, Ala–Glu, Ala-Ser, Ser-Leu
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Densities and specific heat capacities of ternary aqueous systems containing a dipeptide (alanyl-alanine, alanyl-glutamic acid, alanyl-serine or L-seryl-L-leucine) and a macrocycle (D-α-manno-naphtho-18-crown-6-ether or 2,8,14,20-tetrakis[-methyl (aminoformyl)]-4,6,10,12,16,18,22,24-octahydroxycalix[4]arene) were determined at 25°C by flow densimetry and flow calorimetry. The partial molar volume and heat capacity of transfer of a macrocycle from water to the dipeptide solution was determined as a function of the dipeptide concentration. Positive values for transfer volumes and transfer heat capacities are observed with all the solutions studied. With the crown ether, except for alanyl-glutamic acid where a 1:1 complex is clearly evidenced due to specific interactions of the side-chain functional group of the peptide with the crown ether, no stoichiometric complexes are confirmed and the partial molar quantities of transfer increase with the hydrophobic character of the dipeptide. Partial quantities of transfer are smaller with the calixarene than with the crown ether and stoichiometric complexes [calixarene]/[dipeptide] from 2:1 to 1:4 are evidenced, depending on the nature and the concentration of the dipeptide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022653222581
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  • 9
    Electronic Resource
    Electronic Resource
    Temperature Modulated DSC for the Investigation of Polymer Materials: A brief account of recent studies (1999)
    Springer
    Journal of thermal analysis and calorimetry 57 (1999), S. 253-263 
    Details
    ISSN: 1572-8943
    Keywords: calibration ; glass transition ; heat capacity ; non-reversing heat flow ; polymer ; reversing heat flow ; temperature modulated DSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Temperature modulated differential scanning calorimetry (TMDSC), the most recent development that adds periodic modulation to the conventional DSC, has recently seen a fast growth due to availability of commercial instrumentation. The use of the technique necessitates a total control of all of the experimental parameters. The paper focuses on recent applications to investigate polymers [1].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010112801307
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  • 10
    Electronic Resource
    Electronic Resource
    Excess molar heat capacities and excess molar volumes of some mixtures of propylene carbonate with aromatic hydrocarbons (1991)
    Springer
    Journal of solution chemistry 20 (1991), S. 17-28 
    Details
    ISSN: 1572-8927
    Keywords: Excess heat capacity ; M-shapedC P E ; excess volume ; propylene carbonate ; benzene ; toluene ; ethylbenzene ; p-xylene ; polar solvent ; aprotic solvent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Excess molar volumes V E and excess molar heat capacities C P E at constant pressure have been measured, at 25°C, as a function of composition for the four binary liquid mixtures propylene carbonate (4-methyl-1,3-dioxolan-2-one, C4H6O3; PC) + benzene (C6H6;B), + toluene (C6H5CH3;T), + ethylbenzene (C6H5C2H5;EB), and + p-xylene (p-C6H4(CH3)2;p-X) using a vibrating-tube densimeter and a Picker flow microcalorimeter, respectively. All the excess volumes are negative and noticeably skewed towards the hydrocarbon side: V E (cm3-mol−1) at the minimum ranges from about −0.31 at x1=0.43 for {x1C4H6O3+x2p-C6H4(CH3)2}, to −0.45 at x1=0.40 for {x1C4H6O3+x2C6H5CH3}. For the systems (PC+T), (PC+EB) and (PC+p-X) the C P E s are all positive and even more skewed. For instance, for (PC+T) the maximum is at x 1,max =0.31 with C P,max E =1.91 J-K−1-mol−1. Most interestingly, C P E of {x1C4H6O3+x2C6H6} exhibits two maxima near the ends of the composition range and a minimum at x 1,min =0.71 with C P,min E =−0.23 J-K−1-mol−1. For this type of mixture, it is the first reported case of an M-shaped composition dependence of the excess molar heat capacity at constant pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651637
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