液体介质对解理云母粘着特性影响的实验研究

通过测量原子量级光滑的两表面间的法向作用力来认识粘着行为发生的过程及机理,利用分辨率为0.02 mN的表面力仪法向力测量系统对存在液体介质的云母表面分离过程中的分离力进行动态测量。在一定范围内,当中间层液体量越大,分离力也越大,粘着现象也就越明显。当中间层为粘性液体如石蜡基中性油时,粘滞力对粘着特性的影响较大;当中间层为小粘度的液体如去离子水时,液体的表面能会对粘着特性有显著影响。

Experimental investigation of adhesion characteristics of cleavage mica surfaces with a liquid layer

The surface mechanics of adhesion between cleavage mica surfaces were studied experimentally by measuring the normal forces between the atomically smooth surfaces.The surface force apparatus with a resolution of 0.02 mN was used to continuously record the dynamic strain signals for real-time,dynamic measurements.The system measured the pull-off forces between the two cleavage mica surfaces with a liquid layer in an approach-separation experiment.The tests show that a thin layer of liquid between the two cleavage mica surfaces increases the pull-off force with the force increasing with the larger liquid thickness.When the middle liquid layer is a high kinematic viscosity liquid,such as neutral paraffine,the viscous force greatly affects the adhesion characteristics.When the liquid layer is a low kinematic viscosity liquid,such as deionized water,the surface energy of the liquid layer strongly affects the adhesion characteristics.