Frictional properties of a polycationic brush.

Frictional properties of a polycationic brush.
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聚阳离子刷的摩擦特性。

DOI:
10.1039/c3sm53201a
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发表时间:
2014
期刊:
影响因子:
3.4
通讯作者:
Raftari M
Raftari M
中科院分区:
化学2区
文献类型:
--
作者:
Raftari M

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末端接枝的聚[2-(二甲基氨基)乙基甲基丙烯酸酯]膜(刷)的摩擦行为已被示出的摩擦力显微镜是一个强大的功能的pH值在水溶液中。使用裸露的氮化硅和金涂层的尖端,和金涂层的探针,通过自组装单层的沉积功能化获得数据。在极端pH值(pH = 1,2,和12),摩擦负载关系被发现是线性的,与阿蒙顿的宏观摩擦定律。然而,在中间pH值,数据拟合单粗糙接触力学模型,约翰逊-肯德尔-罗伯茨(JKR)和Derjaguin-Muller-Toporov模型进行了观察,与JKR行为拟合数据更好地在相对中性的pH值。
The frictional behaviour of end-grafted poly[2-(dimethyl amino)ethyl methacrylate] films (brushes) has been shown by friction force microscopy to be a strong function of pH in aqueous solution. Data were acquired using bare silicon nitride and gold-coated tips, and gold coated probes that were functionalized by the deposition of self-assembled monolayers. At the extremes of pH (pH = 1, 2, and 12), the friction–load relationship was found to be linear, in agreement with Amontons' law of macroscopic friction. However, at intermediate pH values, the data were fitted by single asperity contact mechanics models; both Johnson–Kendall–Roberts (JKR) and Derjaguin–Muller–Toporov models were observed, with JKR behaviour fitting the data better at relatively neutral pH.
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发表时间: 2012
影响因子: 3.4
作者:
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