Interaction between Disodium 1,14-tetradecanediyl Disulfate and Sodium Dodecyl Sulfate or Poly(oxyethylene) Nonyl Phenyl Ether on Alumina

Article abstract of DOI:10.1246/bcsj.62.1037

The interactions between disodium 1,14-tetradecanediyl disulfate (α,ωC14) and sodium dodecyl sulfate (SDS) or poly(oxyethylene) nonyl phenyl ether (NP 7.5) on α-alumina have been studied by measuring the zeta potential, the mean particle size, the amounts of surfactants adsorbed, and the fluorescence spectra of pyrene.When α,ωC14, SDS, or NP 7.5 as a second additive is added to alumina previously flocculated by the addition of SDS or α,ωC14, as a first additive, the flocculated alumina redisperses in the α,ωC14-SDS and α,ωC14-SDS and α,ωC14-NP 7.5 systems.For the α,ωC14-SDS and αωC14-NP 7.5 systems, the redispersion of alumina proceeds in such a manner that the hydophobic parts of SDS or NP 7.5 are in contact with the α,ωC14-coated alumina and the hydrophilic polar groups direct out to aqueous solution, resulting in the formation of mixed bilayers on the alumina, while for the α,ωC14-SDS system the adsorption of SDS on the α,ωC14-coated alumina is not enough to attain the redispersion of alumina.The measurement of the ratio I1/I3 of intensities of the first and third vibrionic bands of the pyrene monomer fluorescence spectra indicates that pyrene is solubilized in a much lower polar site for the αωC14-SDS mixed bilayer than for the mixed bilayer of α,ωC14-NP7.5.