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  • micellization  (2)
  • micellar mass  (1)
  • thermodynamic function of micellization  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Enthalpy-entropy compensation of micellization of ethoxylated nonyl-phenols (1992)
    Springer
    Colloid & polymer science 270 (1992), S. 799-805 
    Details
    ISSN: 1435-1536
    Keywords: Non-ionic surfactants ; micellization ; enthalpy/entropy compensation ; compensation temperature ; thermodynamic function of micellization
    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 thermodynamics of micellization of non-ionic surfactants (ethoxylated nonyl-phenols with different chain length) was studied as a function of ethoxy group number, electrolyte concentration and type, and concentration of short-chain alcohols at different temperature. On the basis of the thermodynamic data the enthalpy/entropy correlation and the ΔH/ΔS compensation temperature were calculated to characterize the solvent-solute and solute-solute interaction. The experimental results have definitely proved that a well-defined correlation exists for all investigated systems and the compensation temperature is independent of the ethoxy group number and the presence of alcohols. The inorganic electrolytes, however, decrease theT c compared to both alcohol-free and alcohol-containing systems, indicating the change in the mechanism of the micellization process. The new theoretical results significantly contribute to confirmation of the earlier conclusion concerning the stability and the structure of non-ionic surfactant solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00776152
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  • 2
    Electronic Resource
    Electronic Resource
    Micelle formation of ethoxylated nonyl-phenols in aqueous solutions (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 267-272 
    Details
    ISSN: 1435-1536
    Keywords: Non-ionic surfactants ; ethoxylated nonyl-phenols ; micellization ; thermodynamics of micelle formation ; critical micelle concentration
    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 micelle formation of nonyl-phenols with various numbers of ethoxy groups (n EO=10–40) was investigated in aqueous solutions and the study was focussed on the effect of temperature (293–323 K), the chain length and the inorganic electrolyte (NaCl) on the critical micelle concentration (c.m.c). The c.m.c. was determined by surface tension and interfacial tension measurements in a water/n-octane system. On the basis of the actual c.m.c. and its temperature dependence the thermodynamic functions of micelle formation (ΔH° m,ΔS°m,ΔG°m) were also calculated. The latter study comprised the determination of the thermodynamic function for unity ethoxy groups (Δ(ΔY° m)) as a function ofn EO. According to the experimental results the micellar solutions are the more stable, the smaller the number of ethoxy groups in the tenside molecule and the higher the temperature as well as the electrolyte content of the system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414964
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  • 3
    Electronic Resource
    Electronic Resource
    Mass, size and shape of micelles formed in aqueous solutions of ethoxylated nonyl-phenols (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 715-722 
    Details
    ISSN: 1435-1536
    Keywords: Non-ionicsurfactants ; ethoxylatednonylsphenols ; micellar mass ; hydrodynamicradius ; conformation ofmicelles
    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 study was extended to analysis of mass, size and conformation of micelles formed in aqueous solutions of ethoxylated nonyl phenols. The results obtained by ultracentrifugal technique between 293 and 323 K have proved that the slightly ethoxylated nonyl phenols form micelles with high molecular mass and larger size at constant temperature, while the increasing length of the ethylene oxide chain favours formation of micelles of smaller molecular mass and size. The transformation of conformation from oblate to spherical shapes ensues with increasing temperature at constant ethoxy number or with ethoxylation at constant temperature. The second virial coefficient decreases with increasing temperature and decreasing ethoxy number. In accordance with the earlier conclucions, the change of the second virial coefficient relates to enhanced variation of monomer solubility, stabilization of micelle structure and increased deviation from ideal behaviour of a given micellar system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425034
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