Abstract:The use of various types of information devices equipped with touch panels has been increasing. When these devices are used directly with fingers, the devices become dirty owing to sweat and oil from users. Therefore, there is considerable interest in keeping the surfaces of devices free from fingerprints and dirt. Antifouling films and coatings are being developed for this purpose. In addition, a method of changing the surface shape by adding a microstructure to a material surface has been developed. The purp… Show more
“…Under lubricated conditions, textured surfaces generally enhance hydrodynamic lubrication 15 , 16 . In contrast, under unlubricated conditions, textured surfaces contribute to apparent contact areas, which also significantly affects the adhesive friction and abrasive friction at the asperity level of counterface 17 – 20 . Moreover, deformation friction of an elastic material due to a textured surface can also affect friction behaviors 21 – 24 .…”
To investigate the friction behaviors of elastomer and polyacetal writing tips sliding on various textured glass surfaces, the influences of the pitch size and height of sub-millimeter to millimeter sized texture on friction were examined via reciprocating friction tests. The friction coefficients of each writing tip could be systematically varied by changing the pitch and height of the texture. These changes in friction were based on the relationship between the convex-concave shapes and the contact parts of the writing tip, and hence, influence the adhesive, abrasive, and deformation frictions. By inducing a surface texture with a pitch smaller than the contact area of the writing tip, the friction coefficient could be reduced effectively. By inducing a surface texture with a larger height, the friction coefficient of the elastomer could be increased due to deformation friction. These behaviors indicate the possibility of controlling the friction by changing the parameters such as the pitch and height of the textured glass surfaces.
“…Under lubricated conditions, textured surfaces generally enhance hydrodynamic lubrication 15 , 16 . In contrast, under unlubricated conditions, textured surfaces contribute to apparent contact areas, which also significantly affects the adhesive friction and abrasive friction at the asperity level of counterface 17 – 20 . Moreover, deformation friction of an elastic material due to a textured surface can also affect friction behaviors 21 – 24 .…”
To investigate the friction behaviors of elastomer and polyacetal writing tips sliding on various textured glass surfaces, the influences of the pitch size and height of sub-millimeter to millimeter sized texture on friction were examined via reciprocating friction tests. The friction coefficients of each writing tip could be systematically varied by changing the pitch and height of the texture. These changes in friction were based on the relationship between the convex-concave shapes and the contact parts of the writing tip, and hence, influence the adhesive, abrasive, and deformation frictions. By inducing a surface texture with a pitch smaller than the contact area of the writing tip, the friction coefficient could be reduced effectively. By inducing a surface texture with a larger height, the friction coefficient of the elastomer could be increased due to deformation friction. These behaviors indicate the possibility of controlling the friction by changing the parameters such as the pitch and height of the textured glass surfaces.
“…Moving the MSJ nozzle during the machining process can provide continuously curved surface textures; however, the surface structures in the horizontal direction depend on the size of the nozzle, causing limitations in the machining resolution [15]. Hence, to compensate for this limitation, the combined application of a conventional photoresist masking process and the MSJ mechanical removal process was considered [16,17].…”
“…Surface microstructures created by etching or laser processing can produce surface micro-irregularities that can confer omniphobic characteristics. However, such studies are rarer; there have been sporadic reports of the use of methods like microslurry-jet [11] and anisotropic etching [12] to confer fingerprint resistance to glass (Figure 5). Figure 5 Schematic of contact area of finger and processed glass.…”
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