Hydrodynamic force measurements: Boundary slip of water on hydrophilic surfaces and electrokinetic effects
Hydrodynamic force measurements: Boundary slip of water on hydrophilic surfaces and electrokinetic effects
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DOI：
10.1103/physrevlett.88.076103
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发表时间：
2002-02-18
影响因子：
8.6
通讯作者：
Butt, HJ
中科院分区：
文献类型：
--
作者：
Bonaccurso, E;Kappl, M;Butt, HJ
利用胶体探针技术测量了光滑亲水表面之间水性介质的流体动力排水力，剪切速率通常可达10⁴ s⁻¹。将测量得到的力曲线与模拟结果进行了比较。为了使实验和模拟的力曲线相符，流体动力必须用一个允许边界滑移的模型来拟合。边界滑移的特征是滑移长度为8 - 9 nm。对于带电表面的力测量，仅考虑流体动力和静电双层力就可以进行模拟。
The hydrodynamic drainage force of aqueous medium between smooth hydrophilic surfaces was measured with the colloidal probe technique up to shear rates of typically 10(4) s(-1). Measured force curves were compared to simulations. To reach agreement between experimental and simulated force curves, the hydrodynamic force had to be fitted with a model allowing for boundary slippage. Boundary slip was characterized by a slip length of 8-9 nm. Force measurements with charged surfaces could be simulated taking only hydrodynamic and electrostatic double-layer forces into account.