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000046882 084__ $$2WoS$$aChemistry, Multidisciplinary
000046882 084__ $$2WoS$$aChemistry, Physical
000046882 084__ $$2WoS$$aMaterials Science, Multidisciplinary
000046882 1001_ $$0P:(DE-HGF)0$$aKiraly, Z.$$b0
000046882 245__ $$aAdsorption calorimetric study of the organization of sodium n-decyl sulfate at the graphite/solution interface
000046882 260__ $$aWashington, DC$$bACS Publ.$$c2001
000046882 300__ $$a2420 - 2425
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000046882 520__ $$aThe material and enthalpy balances of the adsorption of sodium n-decyl sulfate from aqueous solutions onto graphitized carbon black were determined between 288 and 318 K by using an automated flow sorption/microcalorimeter system. At low concentrations, the surfactant molecules form a flat monomolecular film on the graphite plane, in consequence of surface-directed ordering. A mechanism is proposed in which two adsorbed phases coexist during the formation of this surfactant monolayer. The enthalpy of adsorption in the monolayer region is ca. -42 kJ mol(-1), which does not depend appreciably on the temperature or on the surface coverage. At higher concentrations, the ordered monolayer induces surface aggregation to produce half-cylindrical hemimicelles as the critical micelle concentration is approached. The enthalpies of surface aggregation at 288, 298, and 318 K are -10, -16, and -26 kJ mol(-1), respectively. As the temperature is increased from 288 to 318 K, the average number of surfactant molecules in the cross section of a half-cylinder drops from ca. 5.4 to 3.4. Calorimetric evidence is provided that cationic and anionic surfactant adsorption on graphite follow the same mechanism in the low-density and high-density adsorbate regions.
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000046882 7001_ $$0P:(DE-HGF)0$$aFindenegg, G. H.$$b1
000046882 7001_ $$0P:(DE-Juel1)129484$$aKlumpp, E.$$b2$$uFZJ
000046882 7001_ $$0P:(DE-Juel1)VDB1422$$aSchlimper, H.$$b3$$uFZJ
000046882 7001_ $$0P:(DE-HGF)0$$aDekany, I.$$b4
000046882 773__ $$0PERI:(DE-600)2005937-1$$a10.1021/la001552y$$gVol. 17, p. 2420 - 2425$$p2420 - 2425$$q17<2420 - 2425$$tLangmuir$$v17$$x0743-7463$$y2001
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