These probes were
dichloromethane (γ+ = 124.58 mJ m−2
; γ− = 0 mJ m−2
) and ethyl
acetate (γ+ = 0 mJ m−2
; γ− = 457.67 mJ m−2
), both HPLC grade
(Sigma Aldrich). These additions were also at volumes equivalent to a
surface coverage from 5% to 38%. The column temperature was kept
constant at 30 °C. At a fractional surface coverage the R2 value for the
dispersive component of the surface energy using both the Schultz
and the Dorris–Gray Methods was 0.997, and the difference in the dispersive
component of the surface energy is less than 0.40 mJ m−2
.
(Schultz = 46.49 mJ m−2
; Dorris–Gray = of 46.85 mJ m−2
.)