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  • APTS  (1)
  • CH2 rock and skeletal stretch  (1)
  • Key words Crystal polymorphism  (1)
  • Key words Gemini surfactant  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Diffuse reflectance infrared Fourier transform spectral study of the interaction of 3-aminopropyltriethoxysilane on silica gel. Behavior of amino groups on the surface (1997)
    Springer
    Colloid & polymer science 275 (1997), S. 744-753 
    Details
    ISSN: 1435-1536
    Keywords: Key words DRIFT ; APTS ; silica gel ; NH2 behavior
    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  Three silica gel sample systems, modified with 3-amino-propyltriethoxysilane (APTS), were prepared by sequentially sampling the reaction mixture at various time intervals, and the diffuse reflectance infrared Fourier transform (DRIFT) spectra of these samples were measured in the regions 2700–3500 and 1300–2000 cm-1. The IR bands observed at 1597 and 1629–1633 cm-1 were assigned to the deformation modes of NH2 and NH+ 3 groups, respectively. The intensities of these two bands are dependent on both the APTS concentration used in the preparation and the reaction time. The results are summarized as fol-lows. For the sample systems in which smaller APTS concentration were used, most of the NH2 groups of the aminopropyl segments are converted into the NH+ 3 groups on the surface, showing that the SiO-…H+NH2-type structure is predominantly stabilized on the surface of the silica gel. As the APTS concentration in the reaction mixture increases, the population of NH2 groups in the silane layer coated onto the surface increases. Interpretation of the CH stretch region further suggests that cyclic structures may be formed on the surface as a consequence of the formation of NH+ 3 groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050143
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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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