Morphology of MoS2 nanosheets and its influence on water/oil interfaceial tension: A molecular dynamics study

Plate-shaped nanoparticles exhibit huge potential for a broad range of cutting-edge applications in interfacial-based science and technology, such as enhanced oil recovery in hydrocarbon reservoirs, owing to their remarkable features in superior affinity toward interfaces. Understanding the adsorption behavior of nanosheets (NSs) self-assembled at the water/oil interface (W/O interface) is crucial to elucidate the variation of interfacial tension (IFT) and establish special design criteria for efficient industrial use of NSs. Here we present a molecular dynamics study to reveal the morphology of carbon-chain modified molybdenum disulfide (MoS2) nanosheets. The stress exerted on a nanosheet is analyzed. The simulation results demonstrate a significant decrease in interfacial tension after adding NSs to the water/oil system, followed by a noticeable fluctuation with increased NS concentration. Surprisingly, the carbon-chain modified MoS2 nanosheets do not show a greater ability in altering IFT compared to unmodified ones. The IFT fluctuation is found strongly linked to the competition between the effects of interface coverage rate of adsorbed nanosheets and the intersection angle arising from nonuniform forces acting on a nanosheet.

Automated summary

Plate-shaped nanoparticles have great potential in interfacial-based science and technology, such as enhanced oil recovery. Understanding the adsorption behavior of nanosheets at the water/oil interface is crucial. Research shows that carbon-chain modified nanosheets do not have a greater ability to alter interfacial tension compared to unmodified ones.