TiO2-SiO2 Nanoparticle-Stabilized Soybean Oil-in-Water Emulsions: Dispersion Stability, Rolling Lubrication Performance, and Surface Self-Cleaning Effects

Publication Name

Journal of Tribology


Vegetable oil-in-water emulsions are common cold rolling lubricants. However, maintaining the required dispersion for polar oil droplets for consistent lubrication and proper surface self-cleaning after rolling remains a practical challenge. In this study, titanium silicate TiO2-SiO2 nanoparticle (NP)-stabilized soybean oil emulsions are produced and NPs functions as dispersant, lubrication enhancer, and detergent agent to clean up oil residue are explored. Cold rolling of SS316 strips reveals a threshold of NPs wt%, at which stably dispersed oil droplets improve tribology and lower the rolling parameters relative to without or at high wt% of NPs. Cleaner as-rolled strips are also obtained with NPs. Favorable results are attributed to the formation of NP-coating layers on oil droplets which enhances dispersion, optimizes plate-out while keeping adequate wetting, and provides a three-body abrasive rolling as opposed to two-body adhesion without NPs. A model of sliding-rolling lubrication in cold rolling is also discussed.

Open Access Status

This publication is not available as open access





Article Number


Funding Sponsor

University of Wollongong



Link to publisher version (DOI)