Coupling of Metals and Biominerals: Characterizing the Interface between Ferromagnetic Shape-Memory Alloys and Hydroxyapatite

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• 作者：Uta Allenstein ; Susanne Selle ; Meike Tadsen ; Christian Patzig ; Thomas H枚che ; Mareike Zink ; Stefan G. Mayr
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：July 22, 2015
• 年：2015
• 卷：7
• 期：28
• 页码：15331-15338
• 全文大小：512K
• ISSN：1944-8252

文摘

Durable, mechanically robust osseointegration of metal implants poses one of the largest challenges in contemporary orthopedics. The application of biomimetic hydroxyapatite (HAp) coatings as mediators for enhanced mechanical coupling to natural bone constitutes a promising approach. Motivated by recent advances in the field of smart metals that might open the venue for alternate therapeutic concepts, we explore their mechanical coupling to sputter-deposited HAp layers in a combined experimental鈥搕heoretical study. While experimental delamination tests and comprehensive structural characterization, including high-resolution transmission electron microscopy, are utilized to establish structure鈥損roperty relationships, density functional theory based total energy calculations unravel the underlying physics and chemistry of bonding and confirm the experimental findings. Experiments and modeling indicate that sputter-deposited HAp coatings are strongly adherent to the exemplary ferromagnetic shape-memory alloys, Ni鈥揗n鈥揋a and Fe鈥揚d, with delamination stresses and interface bonding strength exceeding the physiological scales by orders of magnitude.