Chemical bonding and degradation of ultrathin liquid films for nanolubrication of sliding components in adaptive optics

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

“…Contact angle hysteresis values are of interest for drag reduction during fluid flow [28]. For both unlubricated and lubricated unpolished samples, contact angle hysteresis values are shown in Table 2 [17]). The contact angle hysteresis is believed to occur due to chemical heterogeneity and surface roughness.…”

“…Lubricant was deposited on both the unpolished samples (410 nm in RMS, roughness) and the polished (130 and 55 nm RMS) samples using a typical dip-coater [4,16,17]. The sample roughness and lubricant thickness used are shown in Table 1.…”

“…The binder ratio measured using thermogravimetric analysis (TGA) is about 30%. The glass transition temperature (Tg) of the CFRP rod measured using a differential scanning calorimeter (DSC) is about 180°C [16,17].…”

“…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 [23,25,16,17]. The friction and wear behavior of materials is dependent on their mechanical properties, surface roughness, and the operating environment [7,8,10,11].…”

“…The driving rod sits in the frame with friction plates on two sides and clamped with a leaf spring. Carbon fiber reinforced polymer (CFRP) is the material used as the driving rod in the drive mechanism [16,17]. It is used as a component for a wide variety of engineering applications.…”