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  • Electronic Resource  (7)
  • 1990-1994  (7)
  • Chemistry  (4)
  • enthalpy of crystallization  (3)
  • Acetone  (2)
  • Inorganic Chemistry  (2)
  • N,N-dimethylformamide  (2)
  • Calorimetry
  • General Chemistry
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  • Electronic Resource  (7)
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  • 1
    Electronic Resource
    Electronic Resource
    Enthalpies of solution and of crystallization of lithium nitrate and of lithium nitrate trihydrate in water at 25°C (1990)
    Springer
    Journal of solution chemistry 19 (1990), S. 1029-1039 
    Details
    ISSN: 1572-8927
    Keywords: Activity coefficients ; enthalpies of solution and hydration ; enthalpy of crystallization ; lithium nitrate ; lithium nitrate trihydrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The enthalpies of crystallization of LiNO3 and LiNO3−3H2O from aqueous solutions at 25°C, measured by a calorimetric method and determined from the previously published data on the concentration dependence of the enthalpy of solution, are reported. The results are compared with the values obtained from the concentration dependences of the activity coefficients and from the temperature dependences of the solubilities. The enthalpy of solution at infinite dilution and the enthalpy of hydration are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650506
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Investigation of salt — Mixed solvent systems. XXXVII. Crystallization enthalpy of lithium chloride in mixed solvent systems (1990)
    Springer
    Journal of solution chemistry 19 (1990), S. 437-446 
    Details
    ISSN: 1572-8927
    Keywords: Acetone ; enthalpy of crystallization ; enthalpy of dissolution ; enthalpy of transition ; ion-solvent interaction ; lithium chloride ; methanol ; N,N-dimethylformamide ; solvation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The crystallization enthalpy of LiCl at 25°C in LiCl-H2O-cosolvent systems is determined calorimetrically as a function of the cosolvent content in the mixed solvent. This parameter is used for the investigation of heat phenomena accompanying the solvation of the salt in a saturated solution. The cosolvents employed include methanol, acetone, and N,N-dimethylformamide. The most pronounced change is effected by replacement of water with N,N-dimethylformamide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650376
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Investigations of salt — Mixed solvent systems XXXVIII. Crystallization enthalpy of magnesium chloride in mixed solvent systems (1990)
    Springer
    Journal of solution chemistry 19 (1990), S. 447-455 
    Details
    ISSN: 1572-8927
    Keywords: Acetone ; enthalpy of crystallization ; enthalpy of dissolution ; enthalpy of transition ; ion-solvent interaction ; magnesium chloride ; methanol ; N,N-dimethylformamide ; solvation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The crystallization enthalpies of MgCl2 in MgCl2−H2O-cosolvent systems at 25°C were determined calorimetrically as a function of the cosolvent content in the mixed solvent. Methanol, acetone, and N,N-dimethylformamide were employed as cosolvents. The results show the individual cosolvents to have very differently influences on the energy state of the salt in the saturated solution. The most pronounced changes are effected by an increase of the DMF content in the mixed solvent. The intensity of Mg2+-DMF interaction at a higher DMF content in the saturated solution considerably exceeds the Li+-DMF interaction in LiCl solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650377
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Chemie von Haftgruppen, VI über die Eignung verschiedener Aldehyde und Ketone als Haftgruppen für Monoalkohole (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 1885-1885 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240831
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  • 5
    Electronic Resource
    Electronic Resource
    Erzeugung verschleißmindernder Randschichten durch Ionenstrahlverfahren (1993)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 24 (1993), S. 109-119 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Formation of Wear Resistant Surface Layers by Ion Beam TechniquesIon beam techniques are state of the art procedures for the microelectronic industries. Recently they found more and more interest in materials science with respect to surface improvement of polymers, ceramics and metals.In this contribution at first the procedures and the equipment for ion implantation and ion beam assisted deposition are described.Then examples for basic investigations concerning the formation of hard, dense and non-porous surface coatings with potential for wear and corrosion inhibition are given. Especially the interdependency of ion beam parameters, microstructure of coating and interface and macroscopic properties of the coating/substrate system are discussed. Finally the surface treatment of piston seals, ball bearings and metal forming tools is mentioned illustrating the application potential of ion beam techniques.
    Notes: Die in der Mikroelektronik industriell angewandten Ionenstrahlverfahren finden mehr und mehr Eingang in die Materialforschung zur Oberflächenvergütung von Polymeren, Keramiken und Metallen. In diesem Beitrag werden zunächst die Ionenimplantation und die ionenstrahlgestützte Beschichtung (IBAD) methodisch und apparativ beschrieben. Sodann werden Beispiele für Grundlagenuntersuehungen zur Erzeugung harter, dichter, verschleiß- und korrosionsmindernder Randschichten erwähnt. Dabei wird besonders anf die Zusammenhänge zwischen Ionenstrahlparametern, Mikrostruktur der Schicht bzw. Grenzzone Schicht/Substrat und mechanischen und chemischen makroskopischen Systemeigenschaften eingegangen. Schließlich werden am Beispiel von Kolbenringen, Umformwerkzeugen und Wälzlagern Anwendungspotentiale der Verfahren erläutert.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19930240309
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of Gasoline Octane Numbers by 1H- and 13C-NMR spectroscopy (1992)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 334 (1992), S. 691-695 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An equation describing the relationship between the research octane number (RON) and the 1H-and 13C-NMR is proposed. This equation relates the RON to the aliphatic, olefinic and aromatic hydrogen and carbon, respectively. To check this relationship 60 samples were investigated with RON values between 65 and 96. The fitting procedure yielded good agreement between the RON measured with the ASTM method and the RON calculated from both the 1H-and the 13C-NMR.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19923340809
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  • 7
    Electronic Resource
    Electronic Resource
    Über die Struktur einer neuen Modifikation des Phosphorsulfids P4S9 (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 588 (1990), S. 139-146 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Structure of a New Modification of Phosphorus Sulfide P4S9A new modification of P4S9 is formed by the reaction of phosphorus pentasulfide with isopropanol in a molar ratio 1:4. The pure substance can be isolated by repeated fractional crystallization from CS2. This modification crystallizes in the monoclinic space group P21/n with a = 855.5 pm, b = 1263.7 pm, c = 1245.3 pm, β = 104.94°, Z = 4. Normally the P4S9 I crystallizes from its melts, only by shorttime heating the cubic modification (P4S9 II) is yielded.
    Notes: Bei der Reaktion von Phosphor(V)-sulfid mit Isopropanol im Molverhältnis 1:4 bildet sich eine neue Modifikation des P4S9. Die reine Substanz läßt sich durch mehrfache fraktionierte Kristallisation aus CS2 isolieren. Diese Modifikation kristallisiert in der monoklinen Raumgruppe P21/n mit a = 855,5 pm, b = 1263, 7 pm, c = 1245,3 pm, β = 104,94°, Z = 4. Nach kurzzeitigem Aufschmelzen kristallisiert die kubische Modifikation (P4S9 II), während längeres Schmelzen zur Kristallisation des P4S9 I führt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905880118
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    Paper (German National Licenses)
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