MORPHOLOGICAL CHARACTERIZATION OF FILMS OF ASPHALTENES ON GOLD SUBSTRATES BY SCANNING ELECTRON MICROSCOPY

In recent years the asphaltene deposition of films on metal surfaces has been of great studies because they provide valuable information about the adsorption of asphaltene. This paper presents a study by light microscopy and scanning electron asphaltene films, grown on substrates of gold deposited on a surface electro brass. Samples were prepared with oil extracted asphaltene Ayacucho precipitated in n-hexane at a ratio (1:20) and various concentrations prepared by using as solvents: toluene, isopropyl benzene (cumene) and tetrahydrofuran. The deposition of the films was done using the technique of Spin Coating on the same conditions of speed and spin time. Finally we observed that asphaltene films prepared with cumene came the defect type "groove" with toluene, circular patterns were observed type "coffee rings" and finally diluted with tetrahydrofuran was presented on the surface discontinuity.