Interferometry study of aqueous lubrication on the surface of polyelectrolyte brush

Motoyasu Kobayashi, Hiroyoshi Tanaka, Myo Minn, Joichi Sugimura, Atsushi Takahara

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


The water lubrication behavior of a polyelectrolyte brush was investigated by using double-spacer-layer ultra-thin-film interferometry to determine the thickness of the aqueous lubrication layer present at the interface between the brush and a spherical glass lens. A hydrophilic poly{[2-(methacryloyloxy)ethyl]trimethylammonium chloride} brush was prepared on an optical glass disk coated with layers of semireflective chromium and silica. The thickness of the hydrodynamic lubrication layer was estimated interferometrically. On increasing the sliding velocity from 10-5 to 10-1 m·s-1, the gap between the rotating disk and loading sphere glass lens showed a marked increase to 130 nm at 2 × 10-2 m·s-1, and the friction coefficient simultaneously decreased to 0.01-0.02, indicating that the polyelectrolyte brush promoted the formation of a fluid lubrication layer that separates the rubbing surfaces, preventing direct contact and providing a low friction coefficient. (Chemical Equation Presented).

Original languageEnglish
Pages (from-to)20365-20371
Number of pages7
JournalACS Applied Materials and Interfaces
Issue number22
Publication statusPublished - Nov 26 2014

All Science Journal Classification (ASJC) codes

  • General Materials Science


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