Mechanisms of Friction Reduction of Nanoscale Sliding Contacts Achieved Through Ultrasonic Excitation

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dc.contributor.authorSharahi, Hossein J
dc.contributor.authorEgberts, Philip
dc.contributor.authorKim, Seonghwan
dc.date.accessioned2018-11-26T22:46:04Z
dc.date.available2018-11-26T22:46:04Z
dc.date.issued2018-10
dc.description.abstractFriction reduction is an important issue for proper functioning of nano-/micro-electromechanical systems (N-/MEMS) due to their large surface to volume ratios and the inability of traditional liquid lubricants to effectively lubricate sliding contacts. One efficient technique to achieve substantially lowered friction at nanoscale, as well as superlubricity in some instances, was investigated with the coupling of ultrasonic actuation of the sliding contact in an atomic force microscope (AFM). Despite the successful application of ultrasonic AFM methods in achieving mechanical property measurements and nanoscale subsurface imaging of soft and hard materials, the mechanism of friction reduction in the microscopic contact and the influence of the ultrasonic parameters on friction reduction are still elusive. In this study, the effects of excitation amplitude, applied normal force, tip radius, and humidity on friction have been investigated in detail. Ultrasonic force microscopy (UFM) results are compared against those collected with conventional contact-AFM (C-AFM) and indicate that a reduction in the adhesive interaction between the tip and sample, as well as a reduction in the shear strength can explain the mechanisms of the friction reduction in UFM method. This study opens up a new door for the control of friction and wear, which is critical for the increased lifetime of AFM probes, N-/MEMS devices and would potentially bridge the gap between nanotribology and other fields, such as nanomachining, nanolithography and biomaterials imaging.en_US
dc.identifier.doihttps://doi.org/10.1088/1361-6528/aaf3cden_US
dc.identifier.urihttp://hdl.handle.net/1880/109197
dc.language.isoenen_US
dc.publisherIOP Publishing Ltden_US
dc.publisher.departmentMechanical & Manufacturing Engineeringen_US
dc.publisher.facultySchulich School of Engineeringen_US
dc.publisher.institutionUniversity of Calgaryen_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0en_US
dc.subjectUltrasonic force microscopyen_US
dc.subjectfrictionen_US
dc.subjectwearen_US
dc.subjectnanotribologyen_US
dc.subjectpolystyreneen_US
dc.titleMechanisms of Friction Reduction of Nanoscale Sliding Contacts Achieved Through Ultrasonic Excitationen_US
dc.typejournal articleen_US
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