A Neutron Reflectivity Study of the Adsorption of Aerosol-OT on Self-Assembled Monolayers on Silicon

Fragneto, Giovanna; Li, Zhi Xin; Thomas, Robert K.; Rennie, Adrian R.; Penfold, J.

doi:10.1006/jcis.1996.0148

Cited by 49 publications

(53 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sodium salt of the AOT surfactant has been widely studied at both the air/liquid and solid/liquid interface using neutron reflection both above and below the CMC 2,6,[9][10][11][12] . Fewer measurements of Ca(AOT) 2 at solid/liquid interfaces have been made 6,11 .…”

Section: Introductionmentioning

confidence: 99%

Multilayering of Calcium Aerosol-OT at the Mica/Water Interface Studied with Neutron Reflection: Formation of a Condensed Lamellar Phase at the CMC

et al. 2016

View full text Add to dashboard Cite

Using specular neutron reflection, the adsorption of sodium and calcium salts of the surfactant bis(2-ethylhexyl) sulfosuccinate (Aerosol-OT or AOT) has been studied at the mica/water interface at concentrations between 0.1 and 2 CMC. The pH dependence of the adsorption was also probed. No evidence of the adsorption of Na(AOT) was found even at the critical micelle concentration (CMC) while the calcium salt was found to adsorb significantly at concentrations of 0.5 CMC and above. This interesting and somewhat unexpected finding demonstrates that counterion identity may be used to tune the adsorption of anionic surfactants on anionic surfaces. At the CMC, three condensed bilayers of Ca(AOT) were adsorbed at pH 7 and 9 and four bilayers adsorbed at pH 4. Multilayering at the CMC of Ca(AOT) on the mica surface is an unusual feature of this surfactant/surface combination. Only single bilayer adsorption has been observed at other surfaces at the CMC. We suggest this arises from the high charge density of mica which must provide an excellent template for the surfactant.

show abstract

Section: Introductionmentioning

confidence: 99%

Multilayering of Calcium Aerosol-OT at the Mica/Water Interface Studied with Neutron Reflection: Formation of a Condensed Lamellar Phase at the CMC

et al. 2016

View full text Add to dashboard Cite

show abstract

“…(C 12 E 4 ) and Aerosol-OT, were found to be very similar at the air/liquid and hydrophobic/liquid interfaces (10,22). If adsorption at hydrophobic solid/liquid and air/liquid surwhere x Å 1 for the nonionizable C 12 Betaine and x Å 2 faces were found to be universally similar, structural paramefor the ionizable SDS.…”

Section: (Ii) Characterization Of Adsorbed Surfactant Layersmentioning

confidence: 91%

Neutron Reflection from Mixtures of Sodium Dodecyl Sulfate and Dodecyl Betaine Adsorbed at the Hydrophobic Solid/Aqueous Interface

Hines¹,

Fragneto²,

Thomas³

et al. 1997

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…Despite that the ALA surface carries negative charge, SDBS adsorption at the ALA-liquid interface is significant (even higher than its adsorption on the neutral hydrophilic surface, BME). There are a number of studies [4,32,35,[40][41][42][43][44][45][46] reporting significant adsorption of ionic surfactants on similarly charged surfaces; among which anionic surfactant adsorption onto silica surfaces (negatively charged) has been widely reported in the literature [35,40,41,46,47]. Unlike the case of surfactant adsorption on oppositely charged surfaces, the adsorption on surfaces carrying similar charge to that on the surfactant molecules is not electrostatically driven [35].…”

Section: Sdbs Adsorption At the Ala-liquid Interfacementioning

confidence: 94%

Adsorption of an anionic surfactant at air-liquid and different solid-liquid interfaces from solutions containing high counter-ion concentration

2015

View full text Add to dashboard Cite

The self-assembly (adsorption) of the anionic surfactant, sodium dodecylbenzenesulphonate (SDBS), at airliquid and different (octadecanethiol, β-mercaptoethanol, α-lipoic acid) solid-liquid interfaces from aqueous solutions containing high concentrations of counter-ion has been investigated. SDBS adsorption at the solid-liquid interfaces was obtained using surface plasmon resonance (SPR) while its adsorption at the air-liquid interface was extracted from surface tension measurements. The results have demonstrated that SDBS packing at the air-liquid interface is similar to its packing at the hydrophobic octadecanethiol-liquid interface. Additionally, SDBS packing at the three solid-liquid interfaces increases with increasing surface hydrophobicity, irrespective whether the surface is neutral or negatively charged. Nonetheless, SDBS adsorption is always within monolayer coverage (no evidence of bilayer or admicelle formation). The results have also revealed that SDBS affinity for the solid-liquid interfaces increases with increasing surface hydrophobicity. Furthermore, SDBS affinity for the air-liquid interface is more than 10-fold its affinity for the solid-liquid interfaces.

show abstract

A Neutron Reflectivity Study of the Adsorption of Aerosol-OT on Self-Assembled Monolayers on Silicon

Cited by 49 publications

References 2 publications

Multilayering of Calcium Aerosol-OT at the Mica/Water Interface Studied with Neutron Reflection: Formation of a Condensed Lamellar Phase at the CMC

Multilayering of Calcium Aerosol-OT at the Mica/Water Interface Studied with Neutron Reflection: Formation of a Condensed Lamellar Phase at the CMC

Neutron Reflection from Mixtures of Sodium Dodecyl Sulfate and Dodecyl Betaine Adsorbed at the Hydrophobic Solid/Aqueous Interface

Adsorption of an anionic surfactant at air-liquid and different solid-liquid interfaces from solutions containing high counter-ion concentration

Contact Info

Product

Resources

About