Lubrication of starch in ionic liquid-water mixtures: Soluble carbohydrate polymers form a boundary film on hydrophobic surfaces

Carbohydrate Polymers
Gleb E YakubovJason R Stokes

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 ≥60wt%. In 65wt% EMIMAc, a small amount of soluble starch (0.33wt%) 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. 2nm) 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.

References

Sep 22, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Iliana G SedevaDavid A Beattie
May 6, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·B N J Persson, M Scaraggi
Feb 4, 2012·Physical Chemistry Chemical Physics : PCCP·Susan Perkin
Mar 8, 2013·Carbohydrate Polymers·Weiqing Liu, Tatiana Budtova
May 30, 2013·Proceedings of the National Academy of Sciences of the United States of America·Matthew A GebbieJacob N Israelachvili
Jan 9, 2015·Physical Chemistry Chemical Physics : PCCP·David A BeattiePatryk Wąsik
Apr 23, 2015·Physical Chemistry Chemical Physics : PCCP·Binjia ZhangTony McNally
Feb 7, 2013·The Journal of Physical Chemistry Letters·Alexander M SmithSusan Perkin

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Citations

Oct 6, 2016·Carbohydrate Polymers·Bin ZhangMichael J Gidley
Nov 3, 2020·Chemical Society Reviews·Meirong CaiFeng Zhou

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