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  • 1
    Electronic Resource
    Electronic Resource
    Surface and thermodynamic studies of N-((octyl, dodecyl, and cetyl) oxycarbonylmethyl) pyridinium bromide (1997)
    Springer
    Monatshefte für Chemie 128 (1997), S. 1237-1246 
    Details
    ISSN: 1434-4475
    Keywords: Gibb's equation ; Alkyl bromoacetate ; Critical micelle concentration ; Micellization ; Adsorption ; Thermodynamic parameters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Verschiedene Untersuchungen an wäßrigen Lösungen von N-Octyloxycarbonylmethyl-pyridiniumbromid (C 8), N-Dodecyloxycarbonylmethyl-pyridiniumbromid (C 12) und N-Cetyloxycarbonylmethyl-pyridiniumbromid (C 16) wurden durchgeführt. Oberflächenspannungen, elektrische Leitfähigkeiten und biologische Abbaubarkeit wurden bestimmt. Die bakterizide und fungizide Aktivität der kationischen Tenside wurde untersucht. Oberflächenparameter, insbesondere kritische Micellenkonzentration (CMC), Effektivität (ΠCMC), EffizienzP c20), maximaler Oberflächenüberschuß (Γmax) und minimale Oberfläche (A min) wurden bei verschiedenen Konzentrationen und bei Temperaturen von 20, 35 und 50°C untersucht. Die freien Energien, Enthalpien, Entropien und die Asorption der Tenside in wäßriger Lösung wurden bestimmt.
    Notes: Summary N-Octyloxycarbonylmethyl pyridinium bromide (C 8), N-dodecyloxycarbonylmethyl pyridinium bromide (C 12) and N-cetyloxycarbonylmethyl pyridinium bromide (C 16) were prepared. Several studies were carried out with their aqueous solutions. Surface tensions, electrical conductivities, and biodegradabilities were evaluated. The antibacterial and antifungal activities of the cationic surfactants were studied. Surface properties, particularly critical micelle concentration (CMC), effectiveness (Π CMC ), efficiency (P c20), maximum surface excess (Γmax), and minimum surface area (A min) were investigated at different concentrations at 20, 35, and 50°C respectively. Free energies, enthalpies, entropies of micellization, and adsorption of the surfactants in the aqueous solution were studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807255
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  • 2
    Electronic Resource
    Electronic Resource
    Surface and thermodynamic properties of octyl, dodecyl, and cetyl sulfoacetates (1997)
    Springer
    Monatshefte für Chemie 128 (1997), S. 1085-1092 
    Details
    ISSN: 1434-4475
    Keywords: Gibb's equation ; Alkyl bromoacetate ; Critical micelle concentration ; Micellization ; Adsorption ; Thermodynamic parameters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Drei anionische Tenside (Na-Octylsulfoacetat (A 8), Na-Dodecylsulfoacetat (A 12) und Na-Cetylsulfoacetat (A 16)) wurden aus Bromessigsäurealkylestern hergestellt. An wäßrigen Lösungen der Tenside wurden deren Oberflächenspannung und elektrische Leitfähigkeit gemessen. Oberflächeneigenschaften, insbesondere kritische Micellenkonzentration (MCC), Effektivität (∏ CMC ), Effizienz (P c20) maximaler Oberflächenüberschuß (γmax) und minimale Oberfläche (A min) wurden bei verschiedenen Konzentrationen und bei Temperaturen von 20, 35 und 50°C untersucht. Die freien Energien, Enthalpien, Entropien und die Adsorption der Tenside in wäßriger Lösung wurden bestimmt.
    Notes: Summary Three anionic surfactants (Na-octysulfoacetate (A 8), Na-dodecylsulfoacetate (A 12), and Na-cetylsulfoacetate (A 16) were prepared from alkyl bromoacetate. Several studies were carried out with aqueous surfactant solutions including surface tension, and electrical conductivity measurements. Surface properties, in particular, critical micelle concentration (CMC), effectiveness (∏ CMC ), efficiency (P c20), maximum surface excess (γmax), and minimum surface area (A min) were investigated at different concentrations at 20, 35 and 50°C, respectively. Free energies, enthalpies, entropies of micellization, and adsorption of the surfactants in the aqueous solution were studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807558
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  • 3
    Electronic Resource
    Electronic Resource
    Electrical properties of poly(vinyl chloride) compositions (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 49 (1993), S. 1725-1731 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A sample of poly(vinyl chloride) (PVC) and a polar plasticizer consisting of dioctyl phthalate (DOP) and dibutyl phthalate (DBP) was prepared and found to possess inconvenient electrical properties (permittivity, dielectric loss, and conductivity). Different samples of PVC compositions were formulated from the PVC-DOP-DBP system and also variable proportions of a copolymer of 1-octadecene-maleic anhydride or its hexadecylester. Lead stearate as a heat stabilizer and kaolin as a filler were added. The effect of copolymer structure on the electrical properties of the PVC-DOP-DBP system was studied to obtain a plasticized PVC of good electrical insulation character. © 1993 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070491004
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of some superplasticizers on the mechanical and physicochemical properties of blended cement pastes (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 56 (1995), S. 153-159 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Blended cement pastes made of Portland cement and fine sand (known in Egypt as El-Karnak cement) were made using a water-cement ratio of 0.25 by weight. Three pastes containing admixture (water-soluble condensates) were also prepared using a water-cement ratio of 0.25 and condensate (superplasticizer) content of 0.25% by the weight of cement; the superplasticizers used are Na-phenol sulfonate formaldehyde, Na-polystyrene sulfonate, and Na-ß-naphthol sulfonate formaldehyde condensates. All pastes were cured for various time intervals within the range of 0.02-90 days. Compressive strength tests, hydration kinetics, X-ray diffraction analysis, thermal analysis, and surface properties were studied and related as much as possible to the pore structure of the hardened pastes. © 1995 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070560205
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  • 5
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    Surface and thermodynamic parameters of sodium N -acyl sarcosinate surfactant solutions (1997)
    Wiley
    Details
    Publication Date: 1997-01-01
    Print ISSN: 0003-021X
    Electronic ISSN: 1558-9331
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Wiley
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  • 6
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    Surface and thermodynamic parameters of mixed N-dodecyl N-trimethylsilane ammonium chloride with isooctyl phenol ethoxylate (1999)
    Wiley
    Details
    Publication Date: 1999-01-01
    Print ISSN: 1097-3958
    Electronic ISSN: 1558-9293
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Wiley
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  • 7
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    Surface and thermodynamic studies of N-alkkyl N-trimethylsilane ammonium chloride surfactants (1999)
    Wiley
    Details
    Publication Date: 1999-01-01
    Print ISSN: 1097-3958
    Electronic ISSN: 1558-9293
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Wiley
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