Lateral molecular interaction on heterogeneous surfaces experimentally measured

Dependence of adsorption rates with lateral interactions on local surface coverage of heterogeneous surfaces

“…The four-exponential approximation was also used in Refs. [1,2] and [4][5][6][7][8]. In the present case a three-exponential function suffices having a better repeatability than that of the four.…”

“…They may be due to both, the heterogeneity of the solid surfaces, and the variation of the lateral molecular interactions with 0~, measured as published recently [2] and having been taken into account through Eq. (37), as its second term on the right-hand side shows.…”

“…(3) of Ref. [1], and fl is the lateral interaction parameter (dimensionless) as recently determined [2]. Setring K --k~/kd, according to microscopic reversibility, K being calculated from the KRT value, the only unknown in Eq.…”

“…In two recent papers [1,2], the separation of adsorption sites on heterogeneous surfaces, and the lateral molecular interactions on the same surfaces were measured experimentally by the reversed-flow version of inverse gas chromatography (RF-GC). Both findings support the adsorption mechanism of Bakaev and Steele [3], according to which, after filling some (or all) minima of adsorption potential, the adsorbed molecules create new adsorption sites by providing support to new molecules held at positions which were initially local maxima (saddle points) of the surface.…”

“…The two above papers [1,2] were based on an idea initially published in 1999 [4][5][6][7] to measure experimentally through RF-GC time distribution of adsorption energies, local monolayer capacities, local isotherms, and probability density functions on heterogeneous surfaces, by circumventing altogether the dassical integral equation containing the overall experimental adsorption isotherm O (p, T), the local isotherm 0 ( p, T, e), and the energy distribution function f@) (see Eq. (1) of ref.…”