Adsorption-desorption of n–c7 asphaltenes over micro- and nanoparticles of silica and its impact on wettability alteration

  • Farid Cortés Facultad de Minas, Universidad Nacional de Colombia Sede Medellín
  • Tatiana Montoya Facultad de Minas, Universidad Nacional de Colombia Sede Medellín
  • Sócrates Acevedo Universidad Central de Venezuela
  • Nashaat N. Nassar University of Calgary
  • Camilo Andrés Franco Facultad de Minas, Universidad Nacional de Colombia Sede Medellín
Keywords: Adsorption, desorption, asphaltene, reversibility, wettability, silica


In this work, a study of the adsorption/desorption of n–C7 asphaltenes at low and high concentrations (100 – 30000 mg/L) was performed for which the effects of adsorbent particle size (nano and microsilica), pressure, solvent, and temperature were evaluated. Adsorption/desorption tests on different silica surfaces were performed in batch-mode using UV−vis spectrophotometry and thermogravimetric analyses. Owing to its high surface area and dispersibility, nanosilica adsorbed higher quantities of n–C7 asphaltenes than microsilica. Asphaltene desorption from nanosilica surface was significant, while the desorption from microsilica surfaces was insignificant, suggesting a higher adsorption potential for the latter. Asphaltene adsorption increased with pressure and decreased with temperature. Type of solvent plays a significant role on the asphaltene desorption. The wettability tests for virgin nanosilica and nanosilica contained adsorbed asphaltenes showed that even at high asphaltene loading, the nanoparticles maintained its water-wet nature.


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How to Cite
Cortés, F., Montoya, T., Acevedo, S., Nassar, N. N., & Franco, C. A. (2016). Adsorption-desorption of n–c7 asphaltenes over micro- and nanoparticles of silica and its impact on wettability alteration. CT&F - Ciencia, Tecnología Y Futuro, 6(4), 89–106.


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