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  • 1990-1994  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Detailed thermal study of the rotator phase of pure heptacosane (n-C27H56) by alternating current calorimetry (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 2365-2371 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dynamic heat capacity of heptacosane was measured by ac calorimetry. Samples with a homologous purity of 99.9% were used. The characteristic feature of ac calorimetry of excluding latent heat made it possible to study details of the dynamic heat capacity of the rotator phase. In both the heating and cooling processes at a constant rate of 0.5 K/min, slow motion with a correlation time comparable to 1/3 s was observed. At constant temperatures of the rotator phase significant and slow annealing effects were observed. Experimental results showed that the equilibrium state at temperatures equal to or higher than 329.9 K was apparently different from the equilibrium state at temperatures equal to or lower than 329.5 K. It was shown that the observed experimental results could be explained by assuming existence of a parameter which changes only very slowly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467677
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Accurate Evaluation Techniques of the Interstitial Oxygen Concentrations in the Oxygen Precipitated and the Low-Resistivity CZ-Si Crystals (1993)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 117-118 (Jan. 1993), p. 183-188 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/59/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.117-118.183.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The solubility limit of a solid solutions for the systems of long-chain symmetrical ketones in ann-alkane matrix (1994)
    Springer
    Colloid & polymer science 272 (1994), S. 293-300 
    Details
    ISSN: 1435-1536
    Keywords: Symmetrical ketone ; n-alkane ; solubility limit ; solid solution ; entropy of mixing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The systems of long-chain symmetrical ketones inn-alkane matrices form solid solutions for a low concentration range of the ketone, when the number of carbon atoms n in a ketone molecule Kn is equal to or lower than that in an-alkane molecule. The Kn examined were K25 to K39. The purity of all the samples used was very high. The solubility limit of these solid solutions was determined with DSC measurements. Above the solubility limit (the critical concentration) the systems changed to eutectic mixtures. The relationships for the solubility limit were derived, taking into consideration the lateral two-dimensional and the longitudinal positioning along the chain axes and the correlating energies. The multiplicity of the longitudinal positioning led to a remarkable increase in the solubility limit of the systems of Kn/Cn′ (n′〉n). The present result points to the importance of the entropy of mixing and also for the stability of long-chain crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655500
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Lateral habits of n-alkane single crystals (1991)
    Springer
    Journal of materials science 26 (1991), S. 2793-2796 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The lateral crystal habits of n-alkanes (n-C n H2n+2) have been observed just below the melting points by optical microscopy for n=18, 19, 20, 22, 24, 34, 44, 50 and 65. The shape of the crystals depends on the crystal phase: circular in the rotator phase, lenticular in phase C, and diamond in the low-temperature phase. The rounding of the lateral shape can be explained in terms of thermal roughening of the lateral faces in the disordered phases at high temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00545571
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Lateral habits ofn-alkane single crystals (1991)
    Springer
    Journal of materials science 26 (1991), S. 2793-2796 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The lateral crystal habits ofn-alkanes (n-C n H2n+2) have been observed just below the melting points by optical microscopy forn=18, 19, 20, 22, 24, 34, 44, 50 and 65. The shape of the crystals depends on the crystal phase: circular in the rotator phase, lenticular in phase C, and diamond in the low-temperature phase. The rounding of the lateral shape can be explained in terms of thermal roughening of the lateral faces in the disordered phases at high temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02387753
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    Paper (German National Licenses)
    Fulltext
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