Polysiloxane-Based Liquid-like Layers for Reducing Polymer and Wax Fouling

Area of Science:

• Materials Science
• Surface Chemistry
• Tribology

Background:

• Surface fouling by polymers and waxes causes significant economic losses in industries like oil and gas.
• Existing strategies for preventing wax and polymer buildup are limited.
• Fouling impacts crude oil pipelines, jet fuel injectors, reaction vessels, and heat exchangers.

Purpose of the Study:

• To investigate the efficacy of highly disordered, siloxane liquid-like layers in reducing wax and polymer deposition.
• To understand the antifouling mechanism at a molecular level.

Main Methods:

• Development of siloxane liquid-like layers on surfaces.
• Quantification of surface roughness reduction for polymer and wax fouling.
• Utilizing Sum Frequency Generation (SFG) spectroscopy to probe interfacial properties.

Main Results:

• Siloxane layers reduced post-adsorption roughness for polymer by 35-fold and wax by 47-fold compared to control surfaces.
• SFG analysis indicated higher grafting density and conformational freedom at the interface.
• These interfacial properties make the surfaces energetically unfavorable for fouling accretion.

Conclusions:

• Highly disordered siloxane liquid-like layers are effective antifouling surfaces.
• The antifouling mechanism is attributed to unfavorable energetics for accretion due to surface structure.
• This approach offers a promising strategy for mitigating polymer and wax fouling in industrial applications.