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  • 1
    Electronic Resource
    Electronic Resource
    Spectrophotometric study on the quaternary complex of titanium (IV) with secondary ligands, 2,6,7-trihydroxylphenyl-fluorone derivatives and cetyltrimethylammonium bromide (1992)
    Springer
    Microchimica acta 108 (1992), S. 79-91 
    Details
    ISSN: 1436-5073
    Keywords: titanium determination ; 2,6,7-trihydroxylphenyl-fluorone ; nitrilotriacetic acid ; spectrophotometry ; cationic surfactant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The new color reactions of titanium (IV) with six 2,6,7-trihydroxyl-9-phenylsubstituted-3-fluorone derivatives (THPF) have been studied in the presence of nitrilotriacetic acid (NTA) and cetyltrimethylammonium bromide (CTMAB). The effects of secondary ligands such as NTA, ascorbic acid, hydroxylamine and mandelic acid on the ternary complex of titanium (IV) have been reported. It was found that the system of titanium (IV)-2,6,7-trihydroxyl-9-(2′,4′-dichlorophenyl)-3-fluorone (DCPF)-NTA-CTMAB quaternary complex is the most sensitive in these systems studied. The apparent molar absorptivity of the complex at 576 nm is 1.9 × 105 1·mol−1·cm−1. The stoichiometric ratio of the Ti (IV)-NTA-DCPF-CTMAB complex is estimated to be 1 ∶ 1 ∶ 3 ∶ 3. The proposed method proves to be satisfactory for the direct determination of titanium in alloy steels, silicate minerals and aluminium alloys. The method is highly sensitive and selective.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01240374
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Gravity-Driven reactive coating flow down an inclined plane (1994)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 40 (1994), S. 2-10 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The coating flow of a reactive fluid on an inclined plane is studied. The fluid viscosity steadily increases due to a sustained cross-linking reaction. Using well-known long wave approximations and a simple kinetic relation, we find that the linear stability of a uniform coating is affected not only by the inclination angle but also by the reaction order. In the weakly nonlinear limit, a generalized Kuramoto-Sivashinsky (K-S) equation is derived. Two interesting cases are identified in the limit of creeping flow. One is when surface tension is moderate and a generalized Burger's equation results, and the other is when the surface tension is large and the traditional K-S equation is recovered when the inclination angle is greater than 90°. The solution in this case represents a shock-like traveling wave down the incline and it appears to be unique for reacting coating flows.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690400103
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    Paper (German National Licenses)
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