A Skin-Like Self-Healing and Stretchable Substrate for Wearable Electronics

Seo, Hyungtak; Yeasmin, Rubaya; Duy, Le Thai; Ahn, Byungmin

doi:10.2139/ssrn.4194507

Cited by 1 publication

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“…In recent studies, there has been a notable advancement in the development of conductive strain sensors based on collagen and hydrogel materials, showcasing self-healing characteristics. These sensors have found application in detecting human movements and signals, demonstrating their utility in various academic domains, including self-healing sensors, electronic skins, and wearable electronics [ 15 , 16 , 17 , 18 ]. Especially, they are applied as a surface coating material for micro/nano systems, and a self-healing effect that restores damaged areas can be expected.…”

Section: Introductionmentioning

confidence: 99%

Impact of Tribological Conditions on Collagen Coating Self-Healing

Lee,

Kim

2024

Materials

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The study examined the correlation between collagen coating damage and self-healing under various tribological conditions. It confirmed that the friction coefficient and degree of damage on the collagen coating varied based on contact and sliding conditions. The friction coefficient, measured at 0.56 for a single sliding cycle under a 350 mN normal load, demonstrated a notable decrease to 0.46 for 2295 cycles under 30 mN, further reducing to 0.15 for 90 cycles under a 20 mN normal load. As the normal load increased, the friction coefficient decreased, and with repeated sliding cycles under the same load, the coefficient also decreased. Water droplets induced a self-healing effect on collagen coating, causing wear tracks to vanish as fibers absorbed water. Severe wear tracks, with broken fibers and peeled coating, showed limited self-healing. In contrast, mild wear tracks, with compressed yet connected fibers, exhibited the self-healing phenomenon, making the wear tracks disappear. Real-time observations during 90 cycles under a 20 mN normal load highlighted the formation of mild wear tracks with intact collagen fibers, providing quantitative insights into self-healing characteristics. To preserve the self-healing effect of the collagen coating, it is essential to ensure tribological conditions during contact and sliding that prevent the disconnection of collagen fibers.

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