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Dual effects of TiSiO 4 composite nanoparticles on dispersion stability and lubrication performance of vegetable oil‐in‐water emulsions
Author(s) -
Taheri Reza,
Kosasih Buyung,
Zhu Hongtao,
Tieu Anh Kiet
Publication year - 2018
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.1443
Subject(s) - materials science , mass fraction , emulsified fuel , nanoparticle , lubricity , coalescence (physics) , dispersion stability , lubrication , chemical engineering , composite number , dispersion (optics) , emulsion , composite material , fraction (chemistry) , agglomerate , oil droplet , nanotechnology , chemistry , chromatography , physics , optics , astrobiology , engineering
Vegetable oil‐in‐water emulsions are potential metal‐working lubricants. These emulsions are susceptible to oil‐water phase separation due to the oil droplets' coalescence. In this study, we enhance the dispersion stability and lubricity of such emulsions with TiSiO 4 nanoparticles (NPs). With 1 vol% soybean oil, stable emulsions are obtained with 0.25 to 0.75 wt% NPs, attributed to formation of shielding layers of NPs around the droplets. Lowest friction and wear are obtained without and with 0.25 wt% NPs, respectively. With increasing the NPs' mass fraction, NP‐shielded droplets become less attracted to metal surfaces. Association of NPs within boundary film is also found when NPs' mass fraction is above 0.5 wt%, inducing third body abrasive behaviour. Further increasing the NPs' mass fraction results in the formation of agglomerates of NPs in emulsions which increases vibration, friction, and wear. Findings suggest that a mass fraction of NPs exists at which stable emulsions with improved lubrication performance are obtained.