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  • 1
    Electronic Resource
    Electronic Resource
    Reduction of prostacyclin synthesis as a possible cause of transient flow reduction in a partially constricted canine coronary artery
    Amsterdam : Elsevier
    Journal of Molecular and Cellular Cardiology 16 (1984), S. 1137-1149 
    Details
    ISSN: 0022-2828
    Keywords: Coronary flow reduction ; Indomethacin ; Prostacyclin ; Thromboxane A"2 ; Thromboxane A"2 synthetase inhibitor
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0022-2828(84)80040-1
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of pH on emulsion polymerization of styrene in the presence of an amphoteric emulsifier (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 950-956 
    Details
    ISSN: 1435-1536
    Keywords: Amphoteric emulsifier ; emulsion polymerization ; latex ; ionic forms
    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 An emulsion polymerization of styrene in the presence of an amphoteric emulsifier of the betaine type; N,N-dimethyl-n-laurylbetaine (LNB), has been studied at various pH values. The relationships between the physicochemical properties of LNB aqueous solutions, the emulsion polymerization process and the characteristics of the synthesized latex particles were studied under various pH conditions. The polymerization rate and the particle number concentration decreased with increasing pH of LNB aqueous solution and changed in shape at both ca. pH 4 and pH 8–10. The properties of LNB aqueous solution also changed with the pH and changed in shape at the same pH as that of the emulsion polymerization. These pH values were in good agreement with the pH at which the LNB molecule changed its ionic form. The number of synthesized latex particles was proportional to the number of LNB micelles in the solution, below pH 10. The particle size of the synthesized latex particles and the molecular weight of the latex polymers also changed with the properties of LNB aqueous solutions, accompanying the change of the ionic form of LNB molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412396
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  • 3
    Electronic Resource
    Electronic Resource
    Characteristics of mixed bilayers of surfactants formed on alumina (1989)
    Springer
    Colloid & polymer science 267 (1989), S. 525-530 
    Details
    ISSN: 1435-1536
    Keywords: Mixed bilayer ; redispersion ; alumina ; surfactanceinfluence
    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 interaction between hydrocarbon and fluorocarbon surfactants onα-alumina has been studied through the dispersion behavior ofα-alumina. When a low concentration of anionic hydrocarbon or fluorocarbon surfactant as a first additive is added to positively charged alumina, the alumina flocculates. The flocculated alumina redisperses upon addition of different surfactant from the first one by the manner that the hydrophobic parts of hydrocarbon and fluorocarbon surfactants are in contact with hydrophobic parts of the first surfactants and the hydrophilic polar groups direct out to liquid phase, resulting in the formation of mixed bilayers on the alumina. From the measurements of mean particle size, zeta potential of the alumina, and adsorbed amount of surfactants, the mixed bilayers consisting of anionic fluorocarbon-noniomc hydrocarbon surfactants and of anionic fluorocarbon-noioic hydrocarbon ones are found to be formed more preferentially than anionic hydrocarbon-anioic fluorocarbon surfactants. The property of the mixed bilayer on the alumina is also discussed using the fluorescence spectra of pyrene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01416060
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  • 4
    Electronic Resource
    Electronic Resource
    Adsorption von Elekironenakzentoren an Aluminiumoxid (1979)
    Springer
    Colloid & polymer science 257 (1979), S. 446-446 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01521600
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis of polystyrene latex with amphoteric surfactant and its characterization (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 737-742 
    Details
    ISSN: 1435-1536
    Keywords: Amphoteric surfactant ; emulsion polymerization ; latex ; zeta-potential (ZP)
    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 An emulsion polymerization of styrene in the presence of an amphoteric surfactant; N,N-dimethyl-n-laurylbetaine (LNB) was carried out at pH 7.0. The polymerization rate and the concentration of the latex particle were proportional to the LNB concentration of 0.6 power. The latex particle sizes became smaller with increasing concentrations of LNB. The molecular weights of polystyrene latices increased with the concentration of LNB. The zeta-potentials of latex particles were significantly dependent on the pH, and showed the existence of an isoelectric point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01500747
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  • 6
    Electronic Resource
    Electronic Resource
    Characterization of the adsorbed layer of a mixture of nonionic and cationic hydrocarbon surfactants on silica (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 1274-1280 
    Details
    ISSN: 1435-1536
    Keywords: Adsorption of mixed surfactants ; mixed adsorbed layer ; spectroscopic probes
    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 adsorption of hexadecyl trimethylammonium bromide (HDTAB) and nonylphenyl polyglycol ether (NP20) from mixed aqueous solutions on silica has been investigated. The adsorption from mixed solutions is enhanced at low concentration, but is decreased at high concentration compared with those of the single surfactants. Further, measurements of fluorescence spectra of pyrene-3-carboxaldehyde and of ESR spectra of 2,2,6,6-tetramethylpiperidinyl-1-oxy in the surfactant adsorbed layer indicate that the micropolarity of the adsorbed layer is affected by feed mole fraction of HDTAB, in particular over the range of 0.3–0.7, while the microviscosity of the adsorbed layer is almost constant in the same range at a high feed concentration. This suggests that over the same range, the ratio of HDTAB/NP20 at the second layer is almost the same.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652536
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  • 7
    Electronic Resource
    Electronic Resource
    Micellar properties and growth of cationic fluorocarbon surfactant; diethanolheptadecafluoro-2-undecanolmethylammonium chloride (1992)
    Springer
    Colloid & polymer science 270 (1992), S. 927-934 
    Details
    ISSN: 1435-1536
    Keywords: Rod-like micelle ; cationicfluorocarbon surfactant ; dynamiclightscattering ; electricbirefringence ; viscosity
    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 micellar properties of a cationic fluorocarbon surfactant, diethanolheptadecafluoro-2-undecanolmethylammonium chloride (DEFUMAC), are studied by surface tension, fluorescence of pyrene-3-carboxaldehyde (PCA), and electric conductivity measurements. These measurements indicate that DEFUMAC solution provides a low surface tension and that its micelles present higher polar conditions under PCA than do cationic hydrocarbon surtactant micelles. Moreover, the micellar elongation induced by increasing concentrations of salt and surfactant concentration is observed by use of dynamic light scattering, transient electric birefringence, and viscosity measurements. The elongation by addition of salt can be explained by a multiple equilibrium description, while the elongation by increasing surfactant concentration is rapid above a particular concentration, viz. second CMC. Consequently, DEFUMAC micelle elongates more rapidly than do corresponding cationic hydrocarbon surfactants with chloride counterion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657738
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  • 8
    Electronic Resource
    Electronic Resource
    Physicochemical properties of α, ω-type bolaform surfactant in aqueous solution. Eicosane-1,20-bis(triethylammonium bromide) (1989)
    Springer
    Colloid & polymer science 267 (1989), S. 825-830 
    Details
    ISSN: 1435-1536
    Keywords: α ; ω-typesurfactant ; bolaform ; criticalmicelleconcentration ; aggregationnumber ; surfacearea
    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 physicochemical properties of theα, ω- type (bolaform) surfactant, eicosane-1, 20-bis(triethylammonium bromide) (C20Et6), in aqueous solution have been investigated by means of surface tension, electrical conductivity, dye solubilization, and time-resolved fluorescence quenching (determination of average micelle aggregation number). Using electrical conductivity, the critical micelle concentration of C20Et6 was found to be 6.0×10−3 mol dm−3 and the ionization degree of C20Et6 micelle was found to be 0.42. From surface tension measurments, the molecular area of C20Et6 at the air-water interface was about twice that of normal type surfactants such as dodecyltrimethylammonium bromide (DTAB). The solubilizing power of micellar solution of C20Et6 toward Orange OT was 1.0×10−2 mole of dye per mole of surfactant, i. e., slightly smaller than that of DTAB. The micelle aggregation number,N, was found to be 17±2 by time-resolved fluorescence quenching. C20Et6 showed a very small temperature dependence ofN, much less than for normal surfactants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410122
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  • 9
    Electronic Resource
    Electronic Resource
    Phase behavior and dynamic properties in mixed systems of anionic and cationic surfactants: lithium perfluorooctanesulfonate/diethanolheptadecafluoro-2-undecanolmethylammonium chloride (DEFUMAC) and lithium dodecyl sulfate/DEFUMAC aqueous mixtures (1992)
    Springer
    Colloid & polymer science 270 (1992), S. 885-893 
    Details
    ISSN: 1435-1536
    Keywords: Fluorocarbonsurfactant ; mixedsystem ; ion-pairedsurfactant ; P β phase ; lamellarphase
    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 Two ternary phase diagrams of the cationic perfluorosurfactant diethanolheptadecafluoro-2-undecanolmethylammonium chloride (DEFUMAC) with an anionic perfluorosurfactant lithium perfluorooctanesulfonate (LiFOS) and an anionic hydrocarbon surfactant lithium dodecyl sulfate (LiDS) have been established at 25°C. The total surfactant concentration was less than 20wt%. In a wide mixing region of the LiFOS/DEFUMAC system, a lamellar-type phase,P β, was identified by its texture under a polarization microscope and by its x-ray diffraction pattern. Dispersed fragments ofP β-phase are present in the dilute solutions in which one surfactant was in excess. The anisotropy of electrical conductivity, flow birefringence, dynamic light scattering, and electric briefringence demonstrate that theP β fragments are disk-like with a radius of 0.7 μm. The disk-likeP β particles are transformed by shear into a spherical aggregate ofL α above a critical shear gradient. LiDS/DEFUMAC mixed solution forms dispersed and precipitatedL α in the dominant region. Radius and micropolarity of the dispersedL α aggregates are decreased as the ratio of LiDS:DEFUMAC approaches 1:1. On the basis of x-ray diffraction measurement the structure of precipitatedL α-phase seems to consist of monolayers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657733
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  • 10
    Electronic Resource
    Electronic Resource
    Carbonization and graphitization of meso-carbon microbeads prepared by the emulsion method (1992)
    Springer
    Journal of materials science 27 (1992), S. 6079-6085 
    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 Meso-carbon microbeads (MCB) prepared from coal-tar and fluid catalytic cracking (FCC)-decant oil pitches by an emulsion method were carbonized and graphitized. When using the thermosetting process as a pretreatment, the weight gain of MCB by oxidation was approximately 5 wt%, and Fourier transform-infrared measurement showed that the oxidation occurred mainly at aliphatic components in MCB. In the course of carbonization, a heat treatment at 700°C eliminated the C-H groups and the oxygen-containing functional groups, which had remained partly at 500°C. MCB were fairly graphitizable, considering the high values of $$L_{c^{(o o 2)} } $$ obtained from X-ray diffraction measurement. The surface of MCB, which had been originally smooth, became slightly irregular during carbonization, and deformation in the shape of MCB was observed after the graphitization process. These are due to the anisotropic growth and shrinkage of the mesophase structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01133753
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