title: Self-healing Characteristics of Collagen Coatings with Respect to Surface Abrasion.
abstract: A coating based on collagen with self-healing properties was developed for applications in mechanical components that are prone to abrasion due to contact with a counter surface. The inherent swelling behavior of collagen in water was exploited as the fundamental mechanism behind self-healing of a wear scar formed on the surface. The effects of freeze-drying process and water treatment of the collagen coatings on their mechanical and self-healing properties were analyzed. Water was also used as the medium to trigger the self-healing effect of the collagen coatings after the wear test. It was found that collagen coatings without freeze-drying did not demonstrate any self-healing effect whereas the coatings treated by freeze-drying process showed remarkable self-healing effect. Overall, collagen coatings that were freeze-dried and water treated showed the best friction and self-healing properties. Repeated self-healing ability of these coatings with respect to wear scar was also demonstrated. It was also confirmed that the self-healing property of the collagen coating was effective over a relatively wide range of temperature.
authors.affiliation: Center for Nano-Wear, School of Mechanical Engineering, Yonsei University, Seoul, 03722, Republic of Korea.
authors.forename: Chang-Lae
authors.initials: CL
authors.lastname: Kim
authors.affiliation: Center for Nano-Wear, School of Mechanical Engineering, Yonsei University, Seoul, 03722, Republic of Korea.
authors.forename: Dae-Eun
authors.initials: DE
authors.lastname: Kim
mesh_terms: D000818:Animals; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003094:Collagen / Q000737:chemistry*; D005612:Freeze Drying; D017276:Friction; D008422:Materials Testing; D018613:Microscopy, Confocal; D010316:Particle Size; D051381:Rats; D013499:Surface Properties; D013696:Temperature; D014867:Water; D014961:X-Ray Diffraction
chemical_list: D020099:Coated Materials, Biocompatible; D014867:Water; D003094:Collagen