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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Distribution measurement of sodium octyl sulfate in multiphase microemulsion based on the extraction-spectrophotometric method (1988)
    Springer
    Colloid & polymer science 266 (1988), S. 475-478 
    Details
    ISSN: 1435-1536
    Keywords: Extraction-spectrophotometric determination ; anionic surfactant ; phase transition ; multiphase microemulsion systems
    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 determination of anionic surfactant contents in multiphase microemulsions, based on the extraction-spectrophotometric method, has been carried out. The multiphase microemulsion system we studied is composed of sodium octyl sulfate (SOS), n-hexanol, n-decane, and brine. The system shows Winsor type phase-transitions (Winsor I type ↔ Winsor III type ↔ Winsor II type) with changing salinity. We found that the extraction-spectrophotometric method used here is very useful for the determination of anionic surfactants in any microemulsion phases: the partition ratios of SOS in two different phases change continuously within the salinity region at which the phase transition takes place.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01457266
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  • 3
    Electronic Resource
    Electronic Resource
    Solubilization of oleyl alcohol by pure and mixtures of surfactants (1989)
    Springer
    Colloid & polymer science 267 (1989), S. 365-370 
    Details
    ISSN: 1435-1536
    Keywords: Solubilization ; amphotericsurfactant ; mixedsurfactantmicelles ; particlesize
    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 solubilization behavior of oleyl alcohol by pure and mixtures of surfactants systems have been studied in terms of the maximum additive concentration (MAC), the solubilizing power, and the particle sizes of micelles with or without oleyl alcohol. The surfactants used are amphoteric (Nα,Nα-dimethyl-Nε-lauroyl lysine, DMLL; Nα,Nα,Nα-trimethyl-Nε-lauroyl lysine, TMLL; N,N-dimethyl-N-(carboxymethyl)-lauryl ammonium, DMCL), anionic (sodium dodecyl sulfate, SDS) and nonionic (alkyl polyoxyethylene ethers). The maximum additive concentration of oleyl alcohol by pure surfactants is larger by nonionic surfactants than by others. For a nonionic surfactant system mixed with DMLL, the mixing effect of surfactant on the increase in the MAC is not recognized. While, for DMLL mixed with SDS, the MAC becomes larger than that by pure surfactants. This may be attributed to the fact that the large micellar size will result in increasing the maximum additive concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01413631
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Fading phenomena of azo oil dye in anionic-nonionic surfactant solutions III. The effect of solubilizates on the fading behavior of azo oil dye in mixed surfactant systems (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 838-844 
    Details
    ISSN: 1435-1536
    Keywords: Surfactant ; fading phenomena ; azo oil dye ; anionic-noniomc ; mixed surfactant systems
    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 solubilizates on the fading behavior of 4-phenylazo-1-naphthol (4-OH) in aqueous solutions of anionic-nonionic mixed surfactant systems are described; the systems studied are sodium dodecyl sulfate (SDS) — octadecyl poly(oxyethylene) ethers (C18POE20). The fading rate of 4-OH in the mixed solution was independent of the addition of octane. By adding octanoic acid, the rate became faster. On the other hand, the 1-octanol slowed the rate. The fading speed of 4-OH decreased as the concentration of the alcohol and the number of carbon atoms in the alcohol molecule, used as a solubilizate, increased. The sizes of mixed micelles penetrated by the solubilizate were dependent on the kind of oily materials and on the alkyl chain lengths in the molecules of normal higher alcohols. Relative viscosities and effective specific volumes in the mixed micellar solutions increased with the increase in the concentration of 1-octanol and octanoic acid, and with increasing the number of alkyl groups in the alcohol molecule. The effect of solubilizates on the fading behavior of 4-OH was found to be dependent on the differences in their solubilization sites in mixed micelles. A solubilizate with a strong polar group supported a hydrophilic-hydrophilic interaction, whereas one including a weak polar group did not.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01418461
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Estimation of the critical micelle concentrations and the aggregation numbers of sodium alkyl sulfates by capillary-type isotachophoresis (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 604-612 
    Details
    ISSN: 1435-1536
    Keywords: Criticalmicelle concentration ; aggregation number ; sodium alkyl sulfates ; isotachophoresis ; PU value
    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 analytical procedure for the separation and quantification of bulk and micellar phases for sodium alkyl sulfates has been investigated by a capillary-type isotachophoresis using a potential gradient detector. Monomer solutions were distinguished from micellar solutions at pH 5.5–6.0; hydrochloric acid — L-Histidine mixture was used as the leading electrolyte and 2-(N-Morpholino) ethanesulfonic acid as the terminating electrolyte. The potential unit value (PU value) due to the monomer solutions was larger than that due to the micellar solutions. The zone length due to monomer solutions increased with increasing concentration of surfactant until a given concentration (CMC); beyond this point the values became constant. On the other hand, the zone length due to micellar solutions increased from this point. We report an applicability of capillary-type isotachophoresis to determination of the CMC's and aggregation number for various sodium alkyl sulfates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412776
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  • 8
    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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