Role of surface roughness and lubricant film thickness in nanolubrication of sliding components in adaptive optics

Experimental investigation of graphite nanolubricant used in a domestic refrigerator

“…In this research, the application of different kinds of nanoparticles as lubricant additives has been investigated in many fields. [1][2][3][4] Nanolubricant, which was prepared by dispersing nanoparticles in lubricant, performed better than base fluid when using in refrigeration compressor. Several works have applied nanolubricant in vapour-compression refrigeration systems and found that it is an effective way to reduce refrigerator ir-reversibility, 5 enhance energy efficiency ratio of domestic refrigerator 6,7 and residential air conditioners, 8 as well as increase the coefficient of performance of the refrigeration system.…”

Nanotribology of polyvinylidene difluoride (PVDF) in the presence of electric field

“…It is known that lubricant film thickness affects adhesive force as well as lubricant viscosity [1][2][3][4][5]. An increase of lubricant film thickness increases meniscus formation, which leads to higher adhesive force [24]. Adhesive force on the unlubricated poled PVDF slightly increases with electric field.…”

“…In other words, the mobile fraction of the lubricant molecules on the lubricated PVDF surface disturbs the contact between the AFM tip and the PVDF surface. The disturbance of the lubricant molecules reduces wear on the surface [24]. There are other possible reasons.…”

Device level studies of adaptive optics sliding components in microprojectors

“…Wear is a significant concern for actuators such as the adaptive optics drive mechanism components described above, due to the high friction encountered during sliding (Kosaka et al 2006;Lee et al 2008;Bhushan et al 2010a, b;Lee and Bhushan 2011). The friction and wear behavior of materials is dependent on their mechanical properties, surface roughness, and the operating environment (Bhushan 2001(Bhushan , 2002(Bhushan , 2010(Bhushan , 2011.…”

“…Previous studies of the role of surface roughness and lubricant film thickness in nanolubrication of sliding components in adaptive optics have been carried out in an academic, coupon level fashion and only focused on the driving rod (Bhushan et al 2010a, b;Lee and Bhushan 2011). These issues need to be investigated on a device level in order to characterize the role of lubricant film thickness in an actual working device.…”