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  • Surfactant-dye complex  (2)
  • sodium dodecyl sulfate  (2)
  • Fading phenomena  (1)
  • Fluorescent probe  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Thermodynamics of surfactant-dye complex formation in aqueous solutions. Sodium alkyl sulfates and azo oil dye systems (1988)
    Springer
    Colloid & polymer science 266 (1988), S. 156-163 
    Details
    ISSN: 1435-1536
    Keywords: Surfactant-dye complex ; sodium alkyl sulfate ; azo oil dye ; thermodynamics study
    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 Thermodynamics of surfactant-dye complex formation have been studied, in terms of equilibrium coefficient, using a spectrophotometer. The systems are 6 sodium alkyl sulfates, which have different alkyl chain lengths, and 4-phenylazo-1-naphthylamine. A pronounced spectral change in the dye solution occurs on addition of the surfactant; the change has a definite isosbestic point and a new absorption band at 535 nm because of surfactant-dye complex formation, which is caused by hydrophilic-hydrophilic interaction. As the alkyl chain length in the surfactant increases, the values of free energy change (negative) increase, while the value of enthalpy change (negative) increases and the value of entropy change (positive) decreases. The longer the alkyl chain length in surfactant increase, the more stable the surfactant-dye complex becomes. Surfactant-dye complex will form due to hydrophilic-hydrophilic interaction and will become more stable due to hydrophobic-hydrophobic interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01452813
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Fading phenomena of azo oil dye in anionic-nonionic surfactant solutions II. Effects of alkyl and/or oxyethylene groups in nonionic surfactant on the fading rate (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 52-57 
    Details
    ISSN: 1435-1536
    Keywords: Fading phenomena ; azo oil dye ; solution properties ; mixed surfactant system ; anionic-nonionic
    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 effects of alkyl and/or oxyethylene groups in a nonionic surfactant on the fading phenomena of 4-phenylazo-1-naphthol (4-OH), which occur in aqueous solutions of anionic-nonionic surfactant systems, are described; these systems are sodium dodecyl sulfate (SDS) — alkyl poly(oxyethylene) ethers (CmPOEn, m=12,14,16, and 18 at n=20; n=10, 20, 30, and 40 at m=16). The fading phenomenon is observed when 4-OH is added to the anionic-nonionic mixed surfactant solutions at a molar ratio of 1∶1. A singlet oxygen, which is caused by the hydrophilic-hydrophilic interaction between two surfactants, is thought to attack the tautomer of 4-OH. The fading rate of 4-OH accelerates with increasing alkyl chain length or with decreasing oxyethylene chain length in the nonionic surfactant molecule. The effect on the fading behavior of 4-OH would be larger for a system which can easily form a mixed micelle than for a system in which two kinds of micelles coexist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01422664
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ester substrate PNIQ as a novel fluorescent probe for the study of acylation and deacylation steps in ester hydrolysis catalyzed by lipophilic imidazole.Zn^2+ complexes in micelles
    Amsterdam : Elsevier
    Tetrahedron Letters 33 (1992), S. 4191-4194 
    Details
    ISSN: 0040-4039
    Keywords: Ester hydrolysis ; Fluorescent probe ; Metalloenzyme model
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4039(00)74686-7
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Thermodynamics of surfactant-dye complex formation in aqueous solutions II. Sodium dodecyl sulfate and some azo oil dye systems (1988)
    Springer
    Colloid & polymer science 266 (1988), S. 539-546 
    Details
    ISSN: 1435-1536
    Keywords: Surfactant-dye complex ; sodium dodecyl sulfate ; azo oil dye ; thermodynamics study ; dyeing rate
    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 Spectrophotometric and thermodynamic investigations are reported of the interactions between anionic surfactant (sodium dodecyl sulfate) and six azo oil dyes (benzene azo naphthalene type) which have an amino group at 4-position of naphthalene. A pronounced spectral change in the dye solution occurs on addition of surfactant. For increasingly surfactant concentrations (below the CMC), the interaction between dye and surfactant is so sharp that the systems may be said to exhibit an isosbestic point; then a new absorption band appears at longer wavelengths. The spectral data can be quantitatively interpreted in terms of a complex formation. The equilibrium coefficients of the complex formation are determined at different temperatures. The thermodynamic parameters of the complex formations (the free energy change (ΔG), enthalpy change (ΔH) and change in entropy (ΔS) are also calculated. The reaction of complex formation is exothermic (ΔH negative).ΔG is dependent on the hydrophobic nature andpKa of the dye. These complexes will form due to hydrophilic-hydrophilic interaction and will become more stable due to hydrophobic-hydrophobic interaction. With increasing amounts of complex, the infinite adsorption, the exhaustion and the rate constant of dyeing for nylon decrease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01420765
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Removal of trace organic compounds from multicomponent liquid mixtures. I. Adsorption of surfactant mixtures on activated carbon (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 1085-1089 
    Details
    ISSN: 1435-1536
    Keywords: Adsorption ; activated carbon ; surfactants ; sodium dodecyl sulfate ; polyoxyethylene hexadecyl ether
    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 This study shows how trace amounts of surfactants are adsorbed by activated carbon under competitive conditions in aqueous solution. Surfactants used as adsorbates are sodium dodecyl sulfate (SDS) and eicosaneoxyethylene hexadecyl ether (POE). Activated carbon used as an adsorbent is Pittsburgh activated carbon. Adsorption isotherms on the activated carbon were all Freundlich-type, both in the multi-solute system and in the mono-solute systems. The total adsorbed amount in the multi-solute system increases linearly with increasing molar fraction of SDS in the initial concentration. Thus, the total adsorbed amount in the multi-solute system can be estimated by the Freundlich constants, which can be determined from the single-solute equilibrium adsorptions, and molar fractions of adsorbates in the initial concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410327
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    Paper (German National Licenses)
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