A vial was silanized using trichloro(octadecyl)silane to make it hydrophobic. The hydrophobic vial was charged with approximately 25 mg graphite, 10 mL DI water, and 10 mL heptane. The vial was then bath-sonicated for 30 s. This mixture was then transferred to a centrifuge tube and homogenized using a Silverson Model L5M-A homogenizer at 10,000 rpm for 1 min. Once completed, it was transferred back to the hydrophobic vial and microwaved for 30 s at 30% power using an 1100 W microwave. This mixture was then transferred to a centrifuge tube and homogenized for 1 min. Next, a glass slide was placed in the tube and vortexed for 1 min. It was then removed from the vortex mixer and allowed to equilibrate for 30 s. Finally, the films were removed and air-dried.