Kobayashi Motoyasu, Tanaka Hiroyoshi, Minn Myo, Sugimura Joichi, Takahara Atsushi
Japan Science and Technology Agency (JST) ERATO Takahara Soft Interfaces Project, CE80, Kyushu University , 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
ACS Appl Mater Interfaces. 2014 Nov 26;6(22):20365-71. doi: 10.1021/am505906h. Epub 2014 Nov 5.
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.
通过使用双间隔层超薄膜干涉测量法来研究聚电解质刷的水润滑行为，以确定存在于刷与球形玻璃透镜界面处的水润滑层的厚度。在涂覆有半反射铬层和二氧化硅层的光学玻璃盘上制备了亲水性聚{[2-(甲基丙烯酰氧基)乙基]三甲基氯化铵}刷。通过干涉测量法估算了流体动力润滑层的厚度。当滑动速度从10^(-5)增加到10^(-1) m·s^(-1)时，旋转盘与加载球形玻璃透镜之间的间隙在2×10^(-2) m·s^(-1)时显著增加到130 nm，并且摩擦系数同时降低到0.01 - 0.02，这表明聚电解质刷促进了流体润滑层的形成，该润滑层将摩擦表面分隔开，防止直接接触并提供低摩擦系数。
