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  • Gelatin  (2)
  • Arsenazo, Fällg. mit Al-Phosphat  (1)
  • Key words Black foam films  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Schnelle Bestimmung von Uranspuren in Wasser und Meerwasser (1978)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 292 (1978), S. 359-361 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Uran in Wasser ; Spektralphotometrie ; Arsenazo, Fällg. mit Al-Phosphat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Zur schnellen und genauen Bestimmung von Uranspuren in natürlichen, auch salzhaltigen Wässern, wird Uran durch Spurenfällung mit Aluminiumphosphat abgetrennt. Durch Auflösen des mit Zinkpulver vermengten Niederschlages erfolgt Reduktion zu U(IV), das mit Arsenazo III bestimmt wird. Der Extinktionskoeffizient beträgt 97000 cm2/Mol.
    Notes: Summary For the precise and accurate determination of uranium in natural, even saline, waters, it is separated by coprecipitation with Al-phosphate. The precipitate is mixed with zinc powder, dissolved and thus reduced to U(IV), which is determined with Arsenazo III. The molar absorptivity is 97000 cm2/mol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00481551
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  • 2
    Electronic Resource
    Electronic Resource
    On the relation between the molecular mass distribution of gelatin and its ability to stabilize emulsions (1994)
    Springer
    Colloid & polymer science 272 (1994), S. 433-439 
    Details
    ISSN: 1435-1536
    Keywords: Gelatin ; molecular mass distribution ; emulsions ; coalescence stability
    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 relation between the molecular mass distribution of gelatin and its effectiveness in stabilizing emulsions of dibutyl phthalate and dodecane in water have been investigated. The molecular mass distribution was determined using gel permeation chromatography. The ability of gelatin samples to stabilize emulsions was investigated by observing the coalescence of macroscopic oil droplets in a special device. The results show that all samples with a content of more than 30 wt.-% in the low-molecular mass range are good stabilizers, whereas the stabilizing ability is diminished drastically by decreasing the low molecular mass content below 30 wt.-%. Mechanisms for the stabilization and rupture of the thin water film between the oil droplets are discussed, especially in the case of gelatin adsorption layers at the film interfaces. A model is given for the qualitative explanation of the dependence of the stabilizing ability of gelatins on the molecular mass distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00659456
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of gelatin-surfactant interaction by thickness measurements of foam films (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 97-102 
    Details
    ISSN: 1435-1536
    Keywords: Gelatin ; surfactant ; foam film ; thickness
    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 influence of ionic surfactants (sodium-dodecylsulfate and cetyltrimethylammonium-bromide) on the thickness of gelatin foam films was investigated. The thickness of pure gelatin films was found to be 80 to 〈 100 nm. Maximum thicknesses are obtained within the range of the isoelectrical point. Foam films stabilized by gelatin-surfactant complexes are found to form common black films with a thickness of 8 to 12 nm. When the surfactant concentration exceeds the binding capacity of the gelatin the common black films turn into Newton-black films with a thickness comparable to that of a pure surfactant solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410312
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  • 4
    Electronic Resource
    Electronic Resource
    Phospholipid foam films studied by contact angle measurements and fluorescence microscopy (2000)
    Springer
    Colloid & polymer science 278 (2000), S. 771-776 
    Details
    ISSN: 1435-1536
    Keywords: Key words Black foam films ; Contact angle ; Film thickness ; DMPC ; Fluorescence microscopy
    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  Foam films drawn from suspensions of the phospholipid 1,2-dimyristoyl-sn-glycero-3-phosphorylcholine (DMPC) in water/ethanol mixtures were used for the investigation of the relation between the properties of the monolayers and the interaction between the film surfaces. The film thickness and the contact angle between the film and the meniscus were measured as a function of the temperature in a range around the temperature of the main phase transition for the lipid. Additionally, fluorescence microscopy was applied to investigate the distribution of a fluorescent lipidlike dye in the surface of the film and the meniscus. From the contact angle the free energy of film formation was calculated. At the temperature of the chain-melting phase transition the film thickness decreases by 0.7 nm. This can be related to a decrease in the thickness of the hydrocarbon layers of the lipid monolayers at this temperature. The decrease in the film thickness leads to a reduction in the free energy by increasing the van der Waals attraction between the film surfaces. No structures were observed in the monolayers of the film in the fluorescence investigation. However, on formation of the very thin equilibrium film the dye was expelled from the film area, indicating an increase in the packing density of the lipid, if the monolayers are in adhesive contact in the film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960000334
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