materials thin films and coatings and salt scaling there are many factors that contribute to adhesion between two solids the most significant of these are van der waals forces hydrogen bonding electrostatic effects and the surface morphology which affects the total contact area over which the above effects act and the amount of physical interlocking between the surfaces assuming electrostatic effects are negligible the interaction of these bodies with each other will be due to van der waals forces and hydrogen bonding a lewis acid lewis base interaction which is especially important when dealing with polar materials such as water ice or hydrates and surface texture as discussed below a series of experiments were performed to measure contact angles surface energies and the strength of adhesive bonds between a hydrate and various materials for example the adhesion strength of tetrahydrofuran thf hydrate was measured on surfaces having a range of wettabilities and energetic characteristics the results of these adhesion tests indicate that adhesion strength ranged from 422 u00b1 69 kpa on steel which has a measured advancing surface energy of 36 mj m u2212 2 to 90 u00b1 16 kpa on steel coated with an 80 20 pema fluorodecyl poss blend which has a measured advancing surface energy of 9 mj m u2212 2 this four fold reduction in.