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Lubrication of starch in ionic liquid–water mixtures : soluble carbohydrate polymers form a boundary film on hydrophobic surfaces
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Yakubov, Gleb E., Zhong, Lei, Li, Ming, Boehm, Michael W., Xie, Fengwei, Beattie, David A., Halley, Peter J. and Stokes, Jason R. (2015) Lubrication of starch in ionic liquid–water mixtures : soluble carbohydrate polymers form a boundary film on hydrophobic surfaces. Carbohydrate Polymers, 133 . pp. 507-516. doi:10.1016/j.carbpol.2015.06.087 ISSN 0144-8617.
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Official URL: http://dx.doi.org/10.1016/j.carbpol.2015.06.087
Abstract
Soluble starch polymers are shown to enhance the lubrication of ionic liquid–water solvent mixtures in low-pressure tribological contacts between hydrophobic substrates. A fraction of starch polymers become highly soluble in 1-ethyl-3-methylimidazolium acetate (EMIMAc)–water solvents with ionic liquid fraction ≥60 wt%. In 65 wt% EMIMAc, a small amount of soluble starch (0.33 wt%) reduces the boundary friction coefficient by up to a third in comparison to that of the solvent. This low-friction is associated with a nanometre thick film (ca. 2 nm) formed from the amylose fraction of the starch. In addition, under conditions where there is a mixture of insoluble starch particles and solubilised starch polymers, it is found that the presence of dissolved amylose enhances the lubrication of starch suspensions between roughened substrates. These findings open up the possibility of utilising starch biopolymers, as well as other hydrocolloids, for enhancing the performance of ionic liquid lubricants.
Item Type: | Journal Article | |||||||||
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Subjects: | T Technology > TP Chemical technology | |||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | |||||||||
Library of Congress Subject Headings (LCSH): | Starch, Carbohydrates, Hydrophobic surfaces | |||||||||
Journal or Publication Title: | Carbohydrate Polymers | |||||||||
Publisher: | Pergamon Press | |||||||||
ISSN: | 0144-8617 | |||||||||
Official Date: | 2015 | |||||||||
Dates: |
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Volume: | 133 | |||||||||
Page Range: | pp. 507-516 | |||||||||
DOI: | 10.1016/j.carbpol.2015.06.087 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
Date of first compliant deposit: | 11 March 2019 | |||||||||
Date of first compliant Open Access: | 11 March 2019 | |||||||||
RIOXX Funder/Project Grant: |
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