1997
DOI: 10.1021/la960861e
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Weak Influence of Divalent Ions on Anionic Surfactant Surface-Aggregation

Abstract: The aggregated structure of sodium dodecyl sulfate (SDS) adsorbed to the graphite−solution interface has been determined in the presence of the divalent ions:  Mg2+, Mn2+, and Ca2+. Divalent ions are expected to alter the electrostatic interactions between charged headgroups and thus to cause changes from the structure formed with monovalent ions. However, atomic force microscopy reveals that the adsorbed structures are long (μm) and thin (∼5 nm) and thus very similar in appearance to those observed in the pre… Show more

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Cited by 103 publications
(112 citation statements)
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“…The structure and the morphology of the adsorbed aggregates remain the topic of some discussion because no direct structural information is drawn from the adsorption isotherms. However, suitable images of surfactant aggregates adsorbed on hydrophilic or hydrophobic mineral surfaces could be obtained with an atomic force microscope (AFM) (48,49). Sodium dodecyl sulfate surfactants, adsorbed onto a hydrophobic mineral surface of graphite, form periodic structures ordered in one dimension when the solution concentration exceeds 2.8 mM (48).…”
Section: Anionic Surfactant Adsorptionmentioning
confidence: 99%
“…The structure and the morphology of the adsorbed aggregates remain the topic of some discussion because no direct structural information is drawn from the adsorption isotherms. However, suitable images of surfactant aggregates adsorbed on hydrophilic or hydrophobic mineral surfaces could be obtained with an atomic force microscope (AFM) (48,49). Sodium dodecyl sulfate surfactants, adsorbed onto a hydrophobic mineral surface of graphite, form periodic structures ordered in one dimension when the solution concentration exceeds 2.8 mM (48).…”
Section: Anionic Surfactant Adsorptionmentioning
confidence: 99%
“…The adsorption of anionic (1,2) or cationic surfactants (3)(4)(5)(6)(7)(8) on solid surfaces positively or negatively charged in water were known to form two-or three-dimensional molecular aggregates (1)(2)(3)(4)(5)(6)(7)(8) at the interface above and below the cmc of corresponding surfactants. The adsorbed molecules which are in direct contact with a mica surface are expected to be bound by ion-exchange and modify the solid surface to be hydrophobic while the molecules in the outermost part of the surface aggregates are held by hydrophobic interaction and render the hydrophobicized surface hydrophilic.…”
Section: Introductionmentioning
confidence: 99%
“…This central role of the lattice has since been confirmed for a variety of surfactants with wide differences in headgroup chemistry and molecular geometry. 30,31,45,47,53,55,57,58 Unlike hydrophilic surfaces, graphite interacts primarily with surfactant tailgroups via hydrophobic and van der Waals interactions. It has long been known that the graphite surface adsorbs and orients alkyl chains along its three equivalent symmetry axes, with the alkyl chain following the zigzag line connecting nearest-neighbor carbon atoms on graphite.…”
Section: Surfactants On Anisotropic Hydrophobic Surfacesmentioning
confidence: 99%