Journal of the American Chemical Society · 2007 · 40 citations · 7 references
Natural SciencesChemical EngineeringChemistryPhysical ChemistryPolymer ChemistrySurface ChemistryAdsorption ProcessesAdsorptive SeparationsGelsPolymer Phase BehaviorSurface AdsorptionSurfactantsAdsorbent CharacterizationAdsorption ChemistryAdsorption From SolutionAdsorption PropertiesCation ExchangeGel PhaseSolute AdsorptionSurfactant Adsorption
This paper introduces a fundamentally new concept in adsorbents, whereby the sorption of an aqueous solute by a cross-linked polymer is controlled by a gel to liquid-crystalline phase transition. To demonstrate proof of principle, a bilayer forming surfactant, N,N-dioctadecyl,N,N-dimethylammonium bromide (DODAB) has been immobilized onto a cation exchange resin, Dowex 50WX2, and its thermotropic phase behavior and solute-adsorption properties have been investigated. Examination by a combination of differential scanning calorimetry and X-ray scattering has confirmed the retention of a gel to liquid-crystalline phase transition of the surfactant, occurring between 296 and 318 K. Adsorption measurements that were made for 4-chlorotetrahydropyran, 1,2-dichloroethane, and benzyl alcohol have also confirmed uptake by the resin in the liquid-crystalline phase and release in the gel phase.
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Dye solubilization in polyelectrolyte—micelle complexes
E. Sudbeck, Paul L. Dubin, Mary E. Curran et al. · Journal of Colloid and Interface Science · 1991 · 62 citations