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Composition and temperature effects on the solution structure of SDS/octanol/brine by SANS, NMR and microscopy

Donina, Liva ; Porcar, Lionel ; Cabral, João T

Soft matter, 2023-11, Vol.19 (44), p.8542-8551 [Periódico revisado por pares]

England: Royal Society of Chemistry

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  • Título:
    Composition and temperature effects on the solution structure of SDS/octanol/brine by SANS, NMR and microscopy
  • Autor: Donina, Liva ; Porcar, Lionel ; Cabral, João T
  • Assuntos: Brines ; Coexistence ; Dilution ; Elongation ; High temperature ; Light microscopy ; Low concentrations ; Micelles ; Microscopy ; Neutron scattering ; NMR ; Nomograms ; Nuclear magnetic resonance ; Octanol ; Optical microscopy ; Resonance scattering ; Rigidity ; Sodium chloride ; Sodium dodecyl sulfate ; Sodium lauryl sulfate ; Surfactants ; Temperature effects ; Vesicles
  • É parte de: Soft matter, 2023-11, Vol.19 (44), p.8542-8551
  • Notas: https://doi.org/10.1039/d3sm01098h
    Electronic supplementary information (ESI) available. See DOI
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
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  • Descrição: We investigate the solution structures of model sodium dodecyl sulfate/octanol/brine ternary mixtures across the lamellar (L α ), vesicle (L 4 ) and micellar (L 1 ) phases employing small angle neutron scattering (SANS), optical microscopy and nuclear magnetic resonance (NMR). Specifically, we examine the effect of co-surfactant octanol (0.2-9.48 w/v%) and temperature (25-65 °C) along dilution lines at fixed octanol : SDS ratios (0.08-1.21). A transition from L α to sponge phase (L 3 ) above 35 °C is found along the octanol : SDS = 1.21 isopleth, with phase coexistence above 0.14 weight fraction of surfactant and co-surfactant. The lamellar bilayers swell upon dilution, with an approximately linear increase of d -spacing, accompanied by a decrease of the Caillé parameter, indicative of greater membrane rigidity. At a lower octanol : SDS ratio of 0.62, coexistence of oblate micelles and vesicles is observed with preferential formation of vesicles at low concentrations. Dilution of the L 1 phase, along octanol : SDS = 0.08, results in elongated micelles, as the NaCl : SDS ratio increases, while higher temperatures favour the formation of less elongated micelles. Our results provide a detailed map of the equilibrium structures found in the L α vicinity of this extensively investigated flow-responsive surfactant system. We investigate the solution structures of model sodium dodecyl sulfate/octanol/brine ternary mixtures across the lamellar (L α ), vesicle (L 4 ) and micellar (L 1 ) phases employing small angle neutron scattering (SANS), optical microscopy and nuclear magnetic resonance (NMR).
  • Editor: England: Royal Society of Chemistry
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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