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Non-linear rheological study of hydrogel sliding friction in water and concentrated hyaluronan solution

机译:水凝胶滑动摩擦液中水凝胶滑动摩擦溶液的非线性流变研究

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摘要

Studying sliding friction of hydrogels in liquid is important for understanding biological friction. This work applies the non-linear rheology approach to study the friction of elastic hydrogels against adhesive glass in water and in concentrated hyaluronan (HA) solution. Using a rheometer in parallel plate geometry, stress-strain Lissajous curves are obtained from the oscillatory strain sweep test. Non-linearity and energy dissipation are characterized the strain-hardening ratio S, and "energy dissipation occupancy"., respectively. For friction in water, a clear transition from a linear viscoelastic to non-linear viscoelastic response occurs at a critical strain amplitude. Whereas, in HA solution, significant friction reduction and non-linear viscoelastic response occurs, related to the rheological behaviors of HA film intercalated at the gel/glass interface.
机译:研究液体中水凝胶的滑动摩擦对于了解生物摩擦是重要的。 这项工作适用于研究水中粘合剂玻璃和浓透明质酸(HA)溶液的粘合剂玻璃摩擦的非线性流变方法。 在平行板几何中使用流变仪,从振荡应变扫描试验中获得应力 - 应变Lissajous曲线。 非线性和能量耗散的特征在于应变 - 硬化率S和“能量耗散占用”。分别。 对于水中的摩擦,从线性粘弹性到非线性粘弹性响应的透明过渡发生在临界应变幅度。 然而,在HA解决方案中,与在凝胶/玻璃界面中插入的HA膜的流变行为有关的显着摩擦减少和非线性粘弹性响应。

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