A modified method for the determination of dispersion component of surface energy of solids (gad) is presented, in which the determination is based on measurement of the contact angle of interfacial (system) consisting of alkanes (H), water (W), and solids (S) including H-W-S and S-H-W systems. The results show the gsd determine from the glass-H-W system is larger than that from the H-W-glass system. The value for steel (104.7 mJ/m2) is close to the reported value determine by the gas adsorption method. After treatment with alcohol 0.5% NaOH solution, the gsd values of both steel and stainless steel increase remarkably.

Key words: COMPUTATIONAL METHOD, SURFACE ENERGY, SURFACE TENSION, DISPERSION, INTERFACE STATE, CONTACT ANGLE