Liquid adsorption chromatography with mixed mobile phases

A unified theory of retention and selectivity in liquid chromatography. 1. Liquid-solid (adsorption) chromatography

“…where C = (2/3) ^~^ 3^2]* is independent of composition. The latter form of eq 39" agrees with the result reported by Soczewinski7 and Jaroniec et al 8 for solute molecules having different (i.e., greater) molecular areas than the solvents in the limit when one solvent is in excess.…”

Characterization of the surface composition of alkyl bonded phases under reversed-phase liquid chromatographic conditions using homologues of alkanoate and perfluoroalkanoate esters as solute probes

“…Generally, the composition of the surface phase is a function of the mobile phase's composition. It may be estimated theoretically (7) or determined experimentally for the chromatographic packing by measuring the excess sorption isotherm under static or dynamic conditions using the same mixture of solvents as those which form the chromatographic mobile phase (21,22).…”

Solute orientation effects in adsorption liquid chromatography

“…where ks, = exp(E,,/kT) (8) and E,, = E, -El is the difference between adsorption energies of the solute segment and a monomer of the first solvent; k is the Boltzmann constant. Similarly, for a solute which has one adsorbed segment that is chemically distinguishable from those remaining we have :…”

“…where the asterisk refers to the functional group (a distinct segment) and k:, is given by an equation analogous to eqn (8). In the above it has been assumed that the molecular partition functions of all segments and monomers in the stationary phase are equal to the molecular partition functions in the mobile phase.…”