Adsorption of aromatic counterions at the surfactant/water interface: a neutron reflectivity study of hydroxybenzoate and chlorobenzoate counterions at the hexadecyl trimethylammonium surfactant/water interface

Langmuir : the ACS Journal of Surfaces and Colloids
J PenfoldR K Thomas

Abstract

Specular neutron reflectivity has been used to investigate the adsorption of the aromatic counterions hydroxybenzoate and chlorobenzoate at the hexadecyl trimethylammonium bromide surfactant monolayer/water interface. The degree of counterion binding and the location of the counterions at the interface are shown to depend on the isomeric form of the counterion. For hydroxybenzoate, the para-substituted counterion is located within the headgroup region of the surfactant monolayer, and there is of order one counterion for every two surfactant ions. For the ortho-substituted counterion, the degree of counterion binding is higher. There is of order 0.85 counterions for each surfactant ion, and the counterion is located within the hydrophobic region of the monolayer, some 5 A from the center of the headgroup distribution. Similar results were found for the chlorobenzoate counterion, but in that case it was the para-substituted counterion that was more tightly bound and located within the hydrophobic region of the surfactant monolayer. The results for the ortho-substituted hydroxybenzoate and for the para-substituted chlorobenzoate are consistent with those previously reported for the para-tosylate. The results are discussed in the c...Continue Reading

References

Mar 4, 2000·Advances in Colloid and Interface Science·J R LuJ Penfold

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Citations

May 7, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·I TuckerI Grillo
Apr 16, 2013·Advances in Colloid and Interface Science·Nor Saadah M Yusof, M Niyaz Khan
Apr 2, 2008·Advances in Colloid and Interface Science·Rami Abdel-Rahem
Oct 7, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Shaun C Howard, Vincent S J Craig
Aug 30, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·J PenfoldI Grillo
Oct 18, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Onkar SinghRakesh Kumar Mahajan

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