Logarithmic decrease of adhesion force with lateral dynamic revealed by an AFM cantilever at different humidities
Logarithmic decrease of adhesion force with lateral dynamic revealed by an AFM cantilever at different humidities
复制标题
不同湿度下 AFM 悬臂揭示的粘附力随横向动态的对数减小
DOI：
10.1080/00218464.2016.1278532
复制
发表时间：
2018-01-01
影响因子：
2.2
通讯作者：
Huang, Ping
中科院分区：
文献类型：
--
作者：
Lai, Tianmao;Meng, Yonggang;Huang, Ping
在相对湿度为20%~ 90%的条件下，利用原子力显微镜记录了无尖端悬臂梁与Au膜之间的粘附力，研究了横向速度对粘附力的影响。样品横向、前后移动，频率为0.001-100 Hz，扫描距离为0.8、8和80 m，以实现超过7个数量级的速度。实验结果表明，在较低的横向速度（1.6 nm/s ~ 1-10 m/s）下，粘附力随横向速度的变化或增大或减小或保持稳定，没有一定的特征趋势。然而，在临界速度之后，粘附力随横向速度（在1-10和16，000 m/s之间）呈曲线性地减小。减小的幅度可高达最大粘附力的97.3%。这种下降很好地解释了由毛细管冷凝形成的水桥的接触时间依赖性。
Adhesion forces between a tipless cantilever and an Au film were determined to investigate the influence of lateral velocity by recording force curves with an atomic force microscope at 20%-90% relative humidities. The sample was moved laterally, forth and back, with a frequency of 0.001-100 Hz and scan distances of 0.8, 8, and 80 m to achieve a velocity ranging over 7 orders of magnitude. Experimental results show that at low lateral velocities (between 1.6 nm/s and 1-10 m/s), the adhesion force either increases or decreases or remains stable with the lateral velocity without a certain characteristic trend. However, after a critical velocity, the adhesion force decreases logarithmically with the lateral velocity (between 1-10 and 16,000 m/s). The decreasing magnitude can be as large as 97.3% of the maximum adhesion force. This decrease is well-explained by the contact time dependence of water bridges formed by capillary condensation.