In situ tribometry with real-time imaging for assessing durability and wear mechanisms of easy-to-clean coatings on glass for touchscreen substrates

Qian, Jincheng; Schmitt, Thomas; Baloukas, Bill; Kosik-Williams, Carlo; Price, James J.; Null, Eric L.; Paulson, C. A.; Klemberg-Sapieha, Jolanta E.; Martinů, L.

doi:10.1016/j.displa.2019.04.001

Cited by 1 publication

(2 citation statements)

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“…Due to their high adhesion to underlying substrates, thermal stability, and good lubricity, PFPE films function as lubricants in computer hard drives to reduce the friction and wear of the head–disk interface . In recent years, PFPE–silane films have been adopted by the smartphone industry as an antifingerprint coating due to their oleophobic, hydrophobic, and excellent wear resistance properties . When functioning as a glass antifingerprint coating, PFPE–silane films are normally deposited on a SiO 2 layer on top of the glass layer, as shown in an idealized visualization in Figure a.…”

Section: Introductionmentioning

confidence: 99%

“…1 In recent years, PFPE−silane films have been adopted by the smartphone industry as an antifingerprint coating due to their oleophobic, hydrophobic, and excellent wear resistance properties. 2 When functioning as a glass antifingerprint coating, PFPE−silane films are normally deposited on a SiO 2 layer on top of the glass layer, as shown in an idealized visualization in Figure 1a. In reality, the conformation of the PFPE−silane chains may be oriented in any direction including that parallel to the sample surface.…”

Section: ■ Introductionmentioning

confidence: 99%

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Insights into the Mechanical Properties of Ultrathin Perfluoropolyether–Silane Coatings

et al. 2022

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Ultrathin perfluoropolyether–silane (PFPE–silane) films offer excellent functionality as antifingerprint coatings for display touchscreens due to their oleophobic, hydrophobic, and good adhesion properties. During smartphone use, PFPE–silane coatings undergo many abrasion cycles which limit the coating lifetime, so a better understanding of how to optimize the film structure for improved mechanical durability is desired. However, the hydrophobic and ultrathin (1–10 nm) nature of PFPE–silane films renders them very difficult to experimentally characterize. In this study, the cohesive fracture energy and elastic modulus, which are directly correlated with hardness and better wear resistance of 3.5 nm-thick PFPE–silane films were, respectively, measured by double cantilever beam testing and atomic force microscopy indentation. Both the cohesive fracture energy and modulus are shown to be highly dependent on the underlying film structure. Both values increase with optimal substrate conditions and a higher number of silane groups in the PFPE–silane precursor. The higher cohesive fracture energy and modulus values are suggested to be the result of the changes in the film chemistry and structure, leading to higher cross-linking density. Therefore, future work on optimizing PFPE–silane film wear resistance should focus on pathways to improve the cross-linking density. Subcritical fracture testing in humid environments reveals that humidity negatively affects the fracture properties of PFPE–silane films.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%