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Dynamic enhancement in adhesion forces of truncated and nanosphere tips on substrates

机译：基材上截断和纳米尖端尖端粘附力的动态增强

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摘要

The understanding of the attachment and detachment of micro/nanomaterials to and from a substrate can benefit a wide range of interfacial scientific fields. Here, we fabricated two types of AFM tips: a nanosphere tip with a SiO2 nanoparticles having a diameter of 980 nm to the AFM tip and truncated tip with a triangular surface having a side length of 959 nm at the end of the AFM tip. Then we studied the dynamic adhesion enhancement using AFM. When the retraction velocity increased from 0.02 mms ~(-1) to 156 mms ~(-1) , the adhesion force of the two tips to four different substrates significantly increased and the highest increase was on a sapphire substrate. The order of the adhesion forces of nanoscale samples (nanosphere tip and truncated tip) from different substrates was: HOPG > silicon wafer > mica > sapphire, which is reversely consistent with that of the Young's modulus of the substrates. In addition, the dynamic forces of the truncated tip were larger than those of the nanosphere tip. Therefore, the tip shape and substrate had obvious effects on the dynamic adhesion forces. However, the modelling results showed that both the tip shape and substrate type had no obvious effect on the dynamic scaling parameters n and dynamic coefficient parameter C. Our work provides useful information for analyzing the interactions between micro/nanomaterials and their environments. It benefits the understanding of numerous natural phenomena and the development of artificial micro/nanomaterials.
机译：理解微/纳米材料到底物和底物的附着和分离可以有益于各种界面科学领域。在这里，我们制造了两种类型的AFM尖端：纳米末端尖端，其具有直径为980nm的SiO2纳米颗粒，并且在AFM尖端的侧长度具有959nm的三角形表面的截头表面。然后我们使用AFM研究了动态粘合增强。当缩小速度从0.02毫米〜（-1）增加到156毫米〜（-1）时，两个尖端的粘附力至四个不同的基材明显增加，并且在蓝宝石衬底上是最高的增加。来自不同基材的纳米级样品（纳米尖端和截头尖端）的粘附力的顺序是：Hopg>硅晶片>云母>蓝宝石，其与基板的杨氏模量相反。另外，截头尖端的动态力大于纳米尖端的动态力。因此，尖端形状和衬底对动态粘合力具有明显的影响。然而，建模结果表明，尖端形状和衬底类型对动态缩放参数N和动态系数参数C没有明显影响。我们的工作提供了用于分析微/纳米材料及其环境之间的相互作用的有用信息。它有利于对众多自然现象和人造微/纳米材料的发展的理解。

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  • 来源
    《RSC Advances》 |2015年第111期|共7页
  • 作者

    Hongjun Zhou; Quan Xu; Shaowei Li;

  • 作者单位

    State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China;

    State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China;

    State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China;

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  • 正文语种 eng
  • 中图分类 化学;
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