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

Table 3

Surface free energy (mJ/m²) of different surfaces.

Different surfaces
Asphaltene	31.12	3.48	1.42	4.45	35.57
Silica	44.83	0.68	58.10	12.57	57.40
HMPAM on asphaltene	42.27	1.98	33.03	16.17	58.44
HMPAM on silica	43.68	2.51	38.4	19.64	63.32