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- W55014705 abstract "The adsorption of several oligo-oxythyelen alkylethers (C n Em′ with n=4, 6, 8 and m=2, 3, 4) from acetonitrile (A) and methanol (M),. and from binary mixtures of these solvents with water (W) onto graphite has been studied in the Henry’s law region, using liquid-solid elution chromatography. The standard Gibbs energy of adsorption from solution (Δ d G 0) derived from the surface-specific retention volume of the amphiphilic solutes is analyzed in terms of group contributions for methylene groups of the alkyl chain (Δg C 0 ) and oxyethylene groups (Δg E 0 ). For all situations studied (binary eluents with up ton 60 volume % W), Δg C 0 and Δg E 0 are negative, indicating that the two types of groups are both preferentially adsorbed at the graphite surface. The enthalpic and entropic groups contribution Δh C 0 and Δs C 0 are negative, but Δh E 0 and Δs E 0 for the adsorption from M are positive. The composition dependence of Δg C 0 and Δg E 0 in the solvent system A + W is analyzed on the basis of the parallel-layer model of adsorption from multicomponent systems. It is shown that in the present systems the nonideality of the bulk solution causes and enhancement of the adsorption of the methylene groups, but for the oxyethylene groups it has the opposite effect (i.e., adsorption becoming weaker as the concentration of water in the eluent mixture increases)." @default.
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- W55014705 date "2007-12-10" @default.
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- W55014705 title "Adsorption of short-chain polyoxyethylene alkylethers from aqueous and non-aqueous solutions onto graphite. A thermodynamic study using liquid-solid chromatography" @default.
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- W55014705 doi "https://doi.org/10.1007/bfb0116244" @default.
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