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  • CH2 rock and skeletal stretch  (1)
  • Hydrophobic chains  (1)
  • Key words Crystal polymorphism  (1)
  • Key words Gemini surfactant  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Raman scattering spectra of Aerosol-OT homologous sodium dialkylsulfosuccinates and the environment of their hydrophobic chains (1999)
    Springer
    Colloid & polymer science 277 (1999), S. 947-956 
    Details
    ISSN: 1435-1536
    Keywords: Key words Raman spectra ; Sodium dialkylsulfosuccinates ; Hydrophobic chains ; Environment
    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  A homologous series of sodium dialkylsulfosuccinates (SDAS) has been synthesized with various chain lengths (dibutyl, dihexyl, diheptyl, dioctyl, dinonyl, didecyl, diundecyl and didodecyl). These compounds are straight-chain analogues for Aerosol-OT. Raman scattering spectra have been recordered for these SDAS compounds, both in the solid state and in aqueous solutions. These spectra are analyzed in detail in the CH stretch and CH2 deformation regions, and the results depend specifically on the length of the hydrocarbon chain. In particular, the longitudinal accordion-like vibrational modes coming from the all-trans n-alkyl chains have been investigated. For the SDAS dihydrates, all hydrocarbon chains take up an extended form, whereas for the monohydrates the tails tend to become disordered at the CH2-CH2 single bond close to the terminal methyl groups. It has also been confirmed that for the concentrated aqueous SDAS (sodium dibutylsulfosuccinate – sodium dioctylsulfosuccinate) samples preferential stabilization of the extended conformation of the hydrocarbon chain may occur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050474
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  • 2
    Electronic Resource
    Electronic Resource
    Raman scattering study of polyaminopropylsiloxane and its compounds for characterization of 3-aminopropylsilane-modified silica gel. Utility of the CH2 rock and skeletal stretch modes (1997)
    Springer
    Colloid & polymer science 275 (1997), S. 555-560 
    Details
    ISSN: 1435-1536
    Keywords: Key words Raman ; polyamino-propylsiloxane ; GABA ; CH2 rock and skeletal stretch
    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 Raman scattering spectra for polyaminopropylsiloxane (poly-APS) samples in the solid state and in aqueous solution and for the related compounds, γ-aminobutyric acid (GABA) and its hydrochloride salt (GABA ⋅ HCl), have been examined in the CH2 rock and skeletal stretch region. The Raman spectrum of the solid poly-APS sample may be accounted for by direct combination of the Raman spectra for GABA and GABA ⋅ HCl, whose crystal structures have been elucidated by a single-crystal X-ray diffraction study, suggesting that the APS segments of poly-APS in the solid state are in a conformationally ordered state. It has also been found that the Raman spectra of the solid and aqueous poly-APS samples in this region are useful for diagnosing the conformations of APS moieties bound onto the surface of silica gel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050118
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  • 3
    Electronic Resource
    Electronic Resource
    Infrared absorption spectra of Aerosol-OT homologous sodium dialkylsulfosuccinates and the effect of crystal polymorphism on the environment of the succinate segment (1999)
    Springer
    Colloid & polymer science 277 (1999), S. 1051-1057 
    Details
    ISSN: 1435-1536
    Keywords: Key words Crystal polymorphism ; Hydration ; IR spectra ; Sodium dialkylsulfosuccinates ; Succinate segment
    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 A homologous series of sodium dialkylsulfosuccinates, which are straight-chain analogues of Aerosol-OT with various chain lengths (dimethyl, diethyl, dibutyl, dihexyl, diheptyl, dioctyl, didecyl, diundecyl and didodecyl), has been synthesized. In order to assign the IR bands of the CH2 scissoring and CH deformation modes of the succinate segment, sodium dideuteratedmethylsulfosuccinate and sodium dideuteratedethylsulfosuccinate have also been synthesized. IR absorption spectra have been recorded for these mono-, di- and multihydrate samples in the solid state. In particular, IR bands in the 1250–1500 cm−1 region have been compared for sodium dimethylsulfosuccinate, sodium diethylsulfosuccinate and sodium diheptylsulfosuccinate, whose crystal structures are known. The CH2 scissoring and CH deformation modes of the succinate CH2-CH portion strongly depend upon the environment of hydration and on the length of the hydrocarbon portions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050489
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  • 4
    Electronic Resource
    Electronic Resource
    Small-angle neutron-scattering study and micellar model of the gemini (phenylenedimethylene)bis(n-octylammonium)dibromide surfactant micelles in water (1999)
    Springer
    Colloid & polymer science 277 (1999), S. 361-371 
    Details
    ISSN: 1435-1536
    Keywords: Key words Gemini surfactant ; Small-Angle Neutron-Scattering ; Micellar model
    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 microstructure of the micelles formed in aqueous solution by gemini surfactants with aromatic spacers, [Br(CH3)2N+(C m H2 m +1)-(Ph)-(C m H2 m +1)N+(CH3)2Br, m=8 and Ph = o-, m- or p-phenylenedimethylene] has been examined by small-angle neutron scattering. Aggregation of the gemini surfactants with an o-phenylenedimethylene spacer brings about formation of premicelles and small micelles at concentrations below the second critical micelle concentration, while above this concentration marked micellar growth and variation in shape occurs. It is suggested that the minimum aggregate formed at this critical micelle concentration may be the trimer or tetramer and that this result supports the mechanism of “gemini → submicelle → assembly” for micellar growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050393
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