Multivalent counterions diminish the lubricity of polyelectrolyte brushes
Polyelectrolyte brushes provide wear protection and lubrication in many technical, medical, physiological, and biological applications. Wear resistance and low friction are attributed to counterion osmotic pressure and the hydration layer surrounding the charged polymer segments. However, the presen...
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sg-ntu-dr.10356-1380782023-07-14T15:59:26Z Multivalent counterions diminish the lubricity of polyelectrolyte brushes Yu, Jing Jackson, N. E. Xu, X. Morgenstern, Y. Kaufman, Y. Ruths, M. de Pablo, J. Tirrell, M. School of Materials Science & Engineering Engineering::Materials Polymer Brushes Lubrication Polyelectrolyte brushes provide wear protection and lubrication in many technical, medical, physiological, and biological applications. Wear resistance and low friction are attributed to counterion osmotic pressure and the hydration layer surrounding the charged polymer segments. However, the presence of multivalent counterions in solution can strongly affect the interchain interactions and structural properties of brush layers. We evaluated the lubrication properties of polystyrene sulfonate brush layers sliding against each other in aqueous solutions containing increasing concentrations of counterions. The presence of multivalent ions (Y3+, Ca2+, Ba2+), even at minute concentrations, markedly increases the friction forces between brush layers owing to electrostatic bridging and brush collapse. Our results suggest that the lubricating properties of polyelectrolyte brushes in multivalent solution are hindered relative to those in monovalent solution. Accepted version 2020-04-23T06:44:06Z 2020-04-23T06:44:06Z 2018 Journal Article Yu, J., Jackson, N. E., Xu, X., Morgenstern, Y., Kaufman, Y., Ruths, M., . . . Tirrell, M. (2018). Multivalent counterions diminish the lubricity of polyelectrolyte brushes. Science, 360(6396), 1434-1438. doi:10.1126/science.aar5877 0036-8075 https://hdl.handle.net/10356/138078 10.1126/science.aar5877 29954973 2-s2.0-85049149820 6396 360 1434 1438 en Science © 2018 The Authors. Some rights reserved. This paper was published by American Association for the Advancement of Science in Science and is made available with permission of The Authors. application/pdf |
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Engineering::Materials Polymer Brushes Lubrication Yu, Jing Jackson, N. E. Xu, X. Morgenstern, Y. Kaufman, Y. Ruths, M. de Pablo, J. Tirrell, M. Multivalent counterions diminish the lubricity of polyelectrolyte brushes |
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Polyelectrolyte brushes provide wear protection and lubrication in many technical, medical, physiological, and biological applications. Wear resistance and low friction are attributed to counterion osmotic pressure and the hydration layer surrounding the charged polymer segments. However, the presence of multivalent counterions in solution can strongly affect the interchain interactions and structural properties of brush layers. We evaluated the lubrication properties of polystyrene sulfonate brush layers sliding against each other in aqueous solutions containing increasing concentrations of counterions. The presence of multivalent ions (Y3+, Ca2+, Ba2+), even at minute concentrations, markedly increases the friction forces between brush layers owing to electrostatic bridging and brush collapse. Our results suggest that the lubricating properties of polyelectrolyte brushes in multivalent solution are hindered relative to those in monovalent solution. |
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School of Materials Science & Engineering |
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School of Materials Science & Engineering Yu, Jing Jackson, N. E. Xu, X. Morgenstern, Y. Kaufman, Y. Ruths, M. de Pablo, J. Tirrell, M. |
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Article |
author |
Yu, Jing Jackson, N. E. Xu, X. Morgenstern, Y. Kaufman, Y. Ruths, M. de Pablo, J. Tirrell, M. |
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Yu, Jing |
title |
Multivalent counterions diminish the lubricity of polyelectrolyte brushes |
title_short |
Multivalent counterions diminish the lubricity of polyelectrolyte brushes |
title_full |
Multivalent counterions diminish the lubricity of polyelectrolyte brushes |
title_fullStr |
Multivalent counterions diminish the lubricity of polyelectrolyte brushes |
title_full_unstemmed |
Multivalent counterions diminish the lubricity of polyelectrolyte brushes |
title_sort |
multivalent counterions diminish the lubricity of polyelectrolyte brushes |
publishDate |
2020 |
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https://hdl.handle.net/10356/138078 |
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1773551194839449600 |