The purpose of the experimental study is to estimate the thickness of the adsorbed surfactant layer on substrates of different mineral composition using AFM. Two series of experimental studies were set to study the adsorption of surfactant using AFM: 1) formation of surfactant aggregates due to adsorption from solution on a clean substrate, and 2) creating a residual oil layer on a substrate and washing it off using a surfactant. The substrates were selected: natural core and also mica and glass, as they are part of the real oil-bearing core. Both series used the same surfactant in two different concentrations (0.7 and 2.1%). For determination the thickness of the complex constructed adsorbed layer, filled with uniform and non-uniform layers of surfactant molecules a new technique was developed. The essence of this technique is a "scratching" the adsorption layer with subsequent extraction of sectional profile of obtained scan.
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