Coupling research on tiop mechanics and surface physicochemistry
-
摘要: 扫描探针显微镜的发明, 使人们了解纳米、分子和原子尺度的超微结构,探测原子、分子间的力、电、磁及其复杂的物理和化学性质, 以及进行单原子、单分子操纵成为现实. 本文从探针技术与表面化学物理力学耦合的角度出发, 首先对针尖的化学物理力学研究领域进行了概述, 接着介绍了针尖的几种重要的化学修饰方法, 包括金属薄膜、自组装单分子膜、胶体粒子及碳纳米管修饰; 然后以理论与实验结合的方式介绍了几个研究活跃的领域: 表面力及分子间力(主要包括VanderWaals力, 双电层力, 憎水亲合力, Casimir力和单键力等)的理论描述与测量, 针尖的化学物理力学在化学力滴定和表面化学识别等研究中的应用. 讨论了针尖与基底材料对测量力的影响. 而这些复杂的原子、分子相互作用和物理、化学、力学及生物特性的实现均发生于小小针尖上, 由此我们提出了``针尖力学''的概念. 并且指出多场(如电场、磁场、超声、微波等)作用下, 针尖的化学物理力学研究将成为力学交叉学科研究的重点和热点.Abstract: Since the invention of scanning probe microscopy, it ispossible in reality to explore the ultrastructures with a resolutiondown to nanometer, molecule and atom scales, to probe mechanical, electrical,magnetical and complex chemical and physical properties, and to manipulatesingle atom and molecule. From the view point of coupling of probetechniques and surface chemical, physical and mechanical properties, theresearch field of probe's chemical and physical mechanics is summarized inthis paper, and several important methods about chemically modified tips areintroduced, which include using metal films, molecular self-assembly films,colloidal spheres and carbon nanotubes. And then several active researchfields are presented. These fieldsinclude theoretical descriptions and experimental measurements of surfaceand intermolecular forces which mainly involve Van der Waals, double layer,hydrophobic, Casimir and Single-Bond forces, and also involve theapplications of probe techniques related to mechanics of chemical forcetitration, surface chemical recognition and so on. The effect of tip andsubstrate materials on the resulting force is also discussed. Because thesecomplex interactions and physical, chemical, mechanical and biologicalproperties within atoms and molecules can be measured by a tiny tip, we firstput forward the concept of tip mechanics in this paper. Finally,it is pointed out that probe chemical and physical mechanics combined withmultiple fieldswill become an attractive interdisciplinary research field of mechanics.
点击查看大图
计量
- 文章访问数: 1667
- HTML全文浏览量: 113
- PDF下载量: 1112
- 被引次数: 0