Surfactants? Adsorption? Do I mean surfectants and absorption? No, I do not.
Ahem (cue scholarly voice), there are some hair terms you may want to wrap your head around.
Surfactant (from Wikipedia): "Surfactants are compounds that lower the surface tension (or interfacial tension) between two liquids or between a liquid and a solid. Surfactants may act as detergents, wetting agents, emulsifiers, foaming agents, and dispersants."
Surfactants, essentially, help get your hair clean. If you want to know more, read on!