Molecular dynamics simulation was used to investigate the adsorption of a polyaromatic compound (C5Pe) on silica surface from organic solvents. Heptane and toluene were used as oil phase to probe the effect of solvent properties on C5Pe adsorption. The results showed that C5Pe molecules were tend to adsorb rapidly on silica surface in heptane and assembled to form long strip shaped aggregates, while in toluene C5Pe preferred to form aggregates which remain in bulk oil phase. The van der Waals interaction provided the largest contribution for driving the adsorption of C5Pe from heptane solutions due to the protonated state of C5Pe molecules. The calculated lower system free energy of C5Pe adsorption from heptane corresponds well with the observed strong adsorption of C5Pe from heptane than from toluene. AFM imaging confirmed the observed trend of C5Pe adsorption on silica from heptane and toluene.

Adsorption of a polyaromatic compound on silica surfaces from organic solvents studied by molecular dynamics simulation and AFM imaging

254th National Meeting (2017)

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