Interaction and Adsorption of Hydrophobically Modified Polyacrylamide on Silica and Asphaltene Surfaces

Table 4

Free energy of interaction (mJ/m²) between surfaces.

Surfaces
Two asphaltene surfaces	−1.65	−49.14	−50.80
Two silica surfaces	−8.21	43.48	35.26
Asphaltene and silica	−3.69	−16.22	−19.90
HMPAM adsorbed silica and asphaltene	−3.53	−12.63	−16.16
Two HMPAM adsorbed silica	−7.53	−30.68	−38.21
HMPAM adsorbed silica and silica	−7.86	−41.13	−48.99
Two HMPAM adsorbed asphaltene surfaces	−6.72	−33.67	−40.39
HMPAM adsorbed asphaltene and HMPAM adsorbed silica	−7.11	−33.39	−40.50