Relationships between surface energy and charge of surface-modified titanium and HAp formation

• Published in: Applied surface science 2019-01, Vol.465, p.509-516
• Main Authors: Hieda, Junko, Sakaguchi, Akira, Nakano, Masayuki, Akasaka, Hiroki, Ohtake, Naoto
• Format: Article
• Language: English
• Subjects: Functional group; Hard-tissue compatibility; Surface energy; Titanium; Zeta potential
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2018.09.162

[Display omitted] •Relationship between surface property and initial Ca2+ and PO43− adsorption amounts.•High surface energy and highly negative zeta potential led to high Ca/Ti ratio.•Surface property and ideal Ca/P ratio are important on precipitation of HAp.•HAp formed by homogeneous nucleation adsorbed on CH3 and CH2CH-modified Ti surfaces. Surface properties such as surface energy and surface charge are important for bone formation on a Ti surface. We investigated the relationship between surface properties (surface energy and surface charge) and initial Ca2+ and PO43− adsorption amounts on titanium surfaces modified with various functional groups (OH, NH2, SH, CH3, CH2CH, COOH). Surfaces with high surface energy and highly negative zeta potential, such as COOH and OH-modified Ti surfaces, exhibited high Ca2+ adsorption amounts. High surface energy, highly negative zeta potential, and an ideal stoichiometric Ca/P ratio during the initial adsorption of Ca2+ and PO43− led to the precipitation of HAp on COOH-modified Ti surfaces. On the other hand, the adsorption of HAp formed by homogeneous nucleation in the SBF solution occurs on the CH3 and CH2CH-modified Ti surfaces with low surface energy.