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Solid-State NMR Studies of Ionic Surfactants Adsorbed on Cyanopropyl Bonded Phases: Implications for Micellar Liquid Chromatography

Authors
Journal
Journal of Colloid and Interface Science
0021-9797
Publisher
Elsevier
Publication Date
Volume
179
Issue
2
Identifiers
DOI: 10.1006/jcis.1996.0225
Keywords
  • Solid State Nmr
  • Surfactant Adsorption
  • Cp/Mas Nmr
  • Hydrophobic Silicas
  • Micellar Liquid Chromatography

Abstract

Abstract Solid-state 13C NMR spectroscopy techniques, including cross polarization (CP), magic angle spinning (MAS), and high-power proton decoupling, have been used to study the interactions of two ionic surfactants, sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB), with the cyanopropyl bonded phase. Variable contact time CP/MAS 13C NMR data suggest that the unusual behavior of cyanopropyl bonded phase columns in SDS and CTAB micellar reversed-phase liquid chromatography can be attributed to the strong interactions between the polar head group of SDS or CTAB and the cyano functionality of the polar bonded phase. Models which depict the structure of the surfactant-modified cyanopropyl bonded phase are proposed from the NMR data, and these models are in good agreement with the selectivity exhibited by cyanopropyl bonded phase columns toward polar and ionogenic compounds in MLC.

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