Fluorescence probe studies on the structure of the adsorbed layer of dodecyl sulfate at the alumina—water interface

Chandar, P.; Somasundaran, P.; Turro, Nicholas J.

doi:10.1016/0021-9797(87)90165-2

Cited by 283 publications

(238 citation statements)

References 33 publications

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“…Adsorption and the resulting surface structures have been studied by different experimental techniques such as streaming potentialmethod, 1 calorimetry, 2 neutronreflection, 3-5 ellipsometry [6][7][8] and fluorescence spectroscopy, 9,10 and atomic force microscopy (AFM). [11][12][13][14][15][16][17][18] Of these, AFM provides the most detailed information on the topology of the assembled surfactant structures at molecular scales: Manne et al first provided evidence of hexadecyltrimethylammonium bromide (C 16 TAB) organization in parallel stripes at the interface between graphite and aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Structure and Dynamics of Surfactant and Hydrocarbon Aggregates on Graphite: A Molecular Dynamics Simulation Study

2008

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We have examined the structure and dynamics of sodium dodecyl sulfate (SDS) and dodecane (C 12 ) molecular aggregates at varying surface coverages on the basal plane of graphite via classical molecular dynamics simulations. Our results suggest that graphite-hydrocarbon chain interactions favor specific molecular orientations at the single-molecule level via alignment of the tail along the crystallographic directions. This orientational bias is reduced greatly upon increasing the surface coverage for both molecules due to intermolecular interactions, leading to very weak bias at intermediate surface coverages. Interestingly, for complete monolayers, we find a re-emergent orientational bias. Furthermore, by comparing the SDS behavior with C 12 , we demonstrate that the charged head group plays a key role in the aggregate structures: SDS molecules display a tendency to form linear file-like aggregates while C 12 forms tightly bound planar ones. The observed orientational bias for SDS molecules is in agreement with experimental observations of hemimicelle orientation and provides support for the belief that an initial oriented layer governs the orientation of hemimicellar aggregates.

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Section: Introductionmentioning

confidence: 99%

Structure and Dynamics of Surfactant and Hydrocarbon Aggregates on Graphite: A Molecular Dynamics Simulation Study

2008

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“…When CTAB was sorbed to the sediment, the hydrophobic moieties (the tails) of the surfactant formed a hydrophobic sink for hydrophobic chemicals, thereby enhancing the sorption capacity of PFOS. Sorbed surfactants can form aggregates at the solid/liquid interface at concentrations below the critical micelle concentration (Chandar et al, 1987), which have been termed hemimicelles (Gaudin and Fuerstenau, 1995) and admicelles (Harwell et al, 1985). They can exhibit hydrophobic organic chemicals partitioning capabilities because of their micellelike structures (O'Haver and Harwell, 1995).…”

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confidence: 99%

Effect of cationic and anionic surfactants on the sorption and desorption of perfluorooctane sulfonate (PFOS) on natural sediments

Pan

Jia

Zhao

et al. 2009

Environmental Pollution

149

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a b s t r a c tSorption and desorption of PFOS at water-sediment interfaces were investigated in the presence of a cationic surfactant, cetyltrimethylammonium bromide (CTAB), and an anionic surfactant, sodium dodecylbenzene sulfonate (SDBS). CTAB remarkably enhanced the sorption of PFOS on the sediment. In contrast, the influence of SDBS to the sorption of PFOS was concentration dependent. Two contrasting factors were responsible for the phenomenon. One was the sorption of the surfactant itself to the sediment, which enhanced the sorption of PFOS. The other was the increase in solubility of PFOS caused by the adding of surfactants, which decreased the sorption of PFOS. SDBS had a much lower sorption capacity, but rather strong ability to increase the solubility of PFOS. High levels of SDBS remarkably reduced the sorption of PFOS on the sediment. These results imply that cationic and anionic surfactants may have contrast impacts on the distribution and transport of PFOS in the environment.

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“…the CMC, their aggregation number (n), their size. The most frequently applied methods to determine aggregation number are various scattering methods and fluorescence quenching (FQ) method [11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Aggregation of Non Ionic Surfactant Igepal in Aqueous Solution: Fluorescence and Light Scattering Studies

Ghosh

Khatua

Bhattacharya

2003

IJMS

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Fluorescence probe studies on the structure of the adsorbed layer of dodecyl sulfate at the alumina—water interface

Cited by 283 publications

References 33 publications

Structure and Dynamics of Surfactant and Hydrocarbon Aggregates on Graphite: A Molecular Dynamics Simulation Study

Structure and Dynamics of Surfactant and Hydrocarbon Aggregates on Graphite: A Molecular Dynamics Simulation Study

Effect of cationic and anionic surfactants on the sorption and desorption of perfluorooctane sulfonate (PFOS) on natural sediments

Aggregation of Non Ionic Surfactant Igepal in Aqueous Solution: Fluorescence and Light Scattering Studies

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