MENRVA Research Group, School of Engineering Science, Simon Fraser University, 8888 University Drive, Burnaby, BC, Canada V5A1S6.
Langmuir. 2012 Mar 27;28(12):5438-43. doi: 10.1021/la2048882. Epub 2012 Mar 16.
This work presents novel conductive bioinspired dry adhesives with mushroom caps that enable the use of a synergistic combination of electrostatic and van der Waals forces (electro-dry-adhesion). An increase in shear adhesion bond strength of up to 2046% on a wide range of materials is measured when a maximum electrical field of 36.4 V μm(-1) is applied. A suction effect, due to the shape of the dry adhesive fibers, on overall adhesion was not noted for electro-dry-adhesives when testing was performed at both atmospheric and reduced pressure. Utilization of electrostatics to apply a preloading force to dry adhesive fiber arrays allows increased adhesion even after electrostatic force generation has been halted by ensuring the close contact necessary for van der Waals forces to be effective. A comparison is made between self-preloading of the electro-dry-adhesives and the direct application of a normal preloading pressure resulting in nearly the same shear bond strength with an applied voltage of 3.33 kV on the same sample.
这项工作提出了具有蘑菇状帽的新型导电仿生干式粘合剂，能够利用静电力和范德华力的协同组合（电干式粘附）。当施加最大电场 36.4 V μm（-1）时，在广泛的材料上测量到剪切粘附结合强度增加了高达 2046%。在大气和减压下进行测试时，由于干式粘合剂纤维的形状，在静电干式粘附时未观察到整体粘附的抽吸效应。利用静电将预加载力施加到干式粘合剂纤维阵列上，即使在静电生成停止后，通过确保范德华力有效的紧密接触，也可以增加粘附力。对电干式粘合剂的自预加载和直接施加正常预加载压力进行了比较，结果表明，在相同的样品上施加 3.33 kV 的电压时，具有几乎相同的剪切结合强度。
