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Title: Forces between crystalline alumina (sapphire) surfaces in aqueous sodium dodecyl sulfate surfactant solutions

Abstract

Using the surface forces apparatus, we have studied the adsorption of negatively charged sodium dodecyl sulfate (SDS) surfactant onto positively charged surfaces of Al{sub 2}O{sub 3} and the resulting interactions between these surfaces in aqueous solutions. The adsorbed layer thicknesses, adhesion forces, and long range colloidal interactions were measured at SDS concentrations from 0.01 to 5 mM (below the critical micelle concentration, cmc = 8 mM). Our results show that an SDS bilayer of thickness approximately 3.2 nm forms at bulk concentrations above 1 mM (>=1/10(cmc)) and that beyond bilayer-bilayer contact the measured forces are well described by the classical Derjaguin-Landau-Verwey-Overbeek (DLVO) theory (with a constant surface potential at low surfactant coverage and constant surface charge density at high coverage). With one exception, the results are in good agreement with previous data on similar systems obtained using other techniques. The results clarify how electrostatic binding interactions determine the stepped adsorption of, and transitions between, hydrophobic and hydrophilic surfactant layers. The results also provide a basis for understanding why certain surfactants (under appropriate solution conditions) can be used as effective additives in the colloidal processing of ceramic materials. 27 refs., 7 figs., 1 tab.

Authors:
 [1];  [2];  [3]
  1. McGill Univ., Montreal (Canada)
  2. Univ. of Otago, Dunedin (New Zealand)
  3. Univ. of California, Santa Barbara, CA (United States)
Publication Date:
OSTI Identifier:
252931
Resource Type:
Journal Article
Journal Name:
Langmuir
Additional Journal Information:
Journal Volume: 12; Journal Issue: 9; Other Information: PBD: 1 May 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 40 CHEMISTRY; SURFACTANTS; ADSORPTION; ALUMINIUM OXIDES; PROCESSING; SAPPHIRE; SODIUM COMPOUNDS; AQUEOUS SOLUTIONS; THIN FILMS; MICELLAR SYSTEMS; CHEMICAL BONDS

Citation Formats

Xu, Z, Ducker, W, and Israelachvili, J. Forces between crystalline alumina (sapphire) surfaces in aqueous sodium dodecyl sulfate surfactant solutions. United States: N. p., 1996. Web. doi:10.1021/la950939b.
Xu, Z, Ducker, W, & Israelachvili, J. Forces between crystalline alumina (sapphire) surfaces in aqueous sodium dodecyl sulfate surfactant solutions. United States. https://doi.org/10.1021/la950939b
Xu, Z, Ducker, W, and Israelachvili, J. 1996. "Forces between crystalline alumina (sapphire) surfaces in aqueous sodium dodecyl sulfate surfactant solutions". United States. https://doi.org/10.1021/la950939b.
@article{osti_252931,
title = {Forces between crystalline alumina (sapphire) surfaces in aqueous sodium dodecyl sulfate surfactant solutions},
author = {Xu, Z and Ducker, W and Israelachvili, J},
abstractNote = {Using the surface forces apparatus, we have studied the adsorption of negatively charged sodium dodecyl sulfate (SDS) surfactant onto positively charged surfaces of Al{sub 2}O{sub 3} and the resulting interactions between these surfaces in aqueous solutions. The adsorbed layer thicknesses, adhesion forces, and long range colloidal interactions were measured at SDS concentrations from 0.01 to 5 mM (below the critical micelle concentration, cmc = 8 mM). Our results show that an SDS bilayer of thickness approximately 3.2 nm forms at bulk concentrations above 1 mM (>=1/10(cmc)) and that beyond bilayer-bilayer contact the measured forces are well described by the classical Derjaguin-Landau-Verwey-Overbeek (DLVO) theory (with a constant surface potential at low surfactant coverage and constant surface charge density at high coverage). With one exception, the results are in good agreement with previous data on similar systems obtained using other techniques. The results clarify how electrostatic binding interactions determine the stepped adsorption of, and transitions between, hydrophobic and hydrophilic surfactant layers. The results also provide a basis for understanding why certain surfactants (under appropriate solution conditions) can be used as effective additives in the colloidal processing of ceramic materials. 27 refs., 7 figs., 1 tab.},
doi = {10.1021/la950939b},
url = {https://www.osti.gov/biblio/252931}, journal = {Langmuir},
number = 9,
volume = 12,
place = {United States},
year = {Wed May 01 00:00:00 EDT 1996},
month = {Wed May 01 00:00:00 EDT 1996}
}