Load-Dependent Frictional Response of Vertically Aligned Single-Walled Carbon Nanotube SurfacesTuesday (27.09.2016) 14:30 - 14:45 Part of:
We present here our work in adapting a traditional microscratch test to study the frictional properties of vertically aligned single walled carbon nanotube (VASWCNT) films as a function of applied load. Our results show that as a load is applied to the VASWCNT films the frictional response evolved from an initial regime with no measurable frictional response, to a second regime with a very small but measurable response, to a third regime with a large frictional response that increases steadily with applied load. This changes in this response was correlated to the densification of the CNT film and subsequent morphological transformations from the initial vertically aligned state to the intermediate partially collapsed state to the final densely packed horizontally aligned state. These results motivate the ability to measure and potentially engineer the frictional response of CNT and other nanomaterial thin films.