480547 Effect of Barriers and Surfactants on Oil Adhesion to Surfaces

Monday, November 14, 2016
Grand Ballroom B (Hilton San Francisco Union Square)
Mary Holleran1, Katherine Roberts2, Joseph Cremaldi3, Shreyas Oak4, Muhammad Ejaz5, Scott Grayson1 and Noshir Pesika3, (1)Tulane University, New Orleans, LA, (2)Tulane University, New Orleans, LA, (3)Chemical and Biomolecular Engineering, Tulane University, New Orleans, LA, (4)Chemical and Biomolecular engineering, Tulane University, New Orleans, LA, (5)Chemistry, Tulane University, New Orleans, LA

In the event of an oil spill, oil is able to spread on a variety of marine surfaces, potentially harming living organisms. Many of these surfaces are hydrophobic, indicating that oil is likely to spread. This project is aimed to better understand interactions between oil and various substrates and to provide novel dispersants to stabilize oil droplets and prevent adhesion to marine surfaces. To examine oil interactions with differing substrates, a tribometer was utilized to measure the force of adhesion using an inverted, submerged oil droplet lowered into six test surfaces, recording the force of each interaction. Novel dispersants would be required to create a steric barrier at the oil-water interface, to prevent oil adhesion. These barriers were formed by creating carbon nanospheres, coated through ATRP with polystyrene sulfonate. Alone, carbon nanospheres remain in the oil phase, so polymer treatment was used to decrease the particle hydrophobicity. Polystyrene sulfonate was determined to be the most effective polymer to place the particles at the oil-water interface through goniometry testing, indicating a contact angle of oil in water 128º ± 7º. Cryogenic SEM imaging showed that the particles lie at the oil-water interface, with 98% sphere volume in the water phase, therefore creating the required steric barrier. Tribometer imaging was used to test the stabilized emulsion; oil drops treated with the novel dispersant were shown to have the same interaction with hydrophobic surfaces as untreated oil drops had with hydrophilic surfaces, indicating that the oil treated with this dispersant would not be able to spread to hydrophobic marine surfaces.

Extended Abstract: File Not Uploaded