纳米受限水中剪切响应对白云母的影响：阳离子的作用。

Shear response of nanoconfined water on muscovite mica: role of cations.

机构信息

Research Centre for Microsystems and Nanotechnologies, Kaunas University of Technology, LT-51369 Kaunas, Lithuania.

出版信息

Langmuir. 2011 Sep 6;27(17):10351-5. doi: 10.1021/la2021897. Epub 2011 Aug 9.

DOI:10.1021/la2021897

Abstract

By monitoring the thermal noise of a vertically oriented micromechanical force sensor, we detect the viscoelastic response to shear for water in a subnanometer confinement. Measurements in pure water as well as under acidic and high-ionic-strength conditions relate this response to the effect of surface-adsorbed cations, which, because of their hydration, act as pinning centers restricting the mobility of the confined water molecules.

摘要

通过监测垂直取向的微机械力传感器的热噪声，我们检测到水在亚纳米约束下的剪切粘弹性响应。在纯水以及酸性和高离子强度条件下的测量结果将这种响应与表面吸附阳离子的影响相关联，由于这些阳离子的水合作用，它们作为钉扎中心限制了受限水分子的流动性。