Calcium phosphate (CaP) ceramics are used in orthopedics and dentistry due to their excellent biocompatibility and osseointegration. Here, the electro-assisted deposition of CaP on two different self-assembled monolayers (SAMs), 2-mercaptoacetic acid (MAA) and 2-mercaptoethanol (ME), was studied both at short (up to 3 min) and long (2 hours) deposition periods on well-defined evaporated gold surfaces. It was found that the end group of the monolayer has a major effect on the growth of the CaP coating. The deposition was slower and less electrically efficient on MAA SAM, but surface cracking was essentially eliminated due to reduction of the crystallographic mismatch. The carboxylic acid may facilitate CaP growth by attracting Ca2+ ions to the surface, which could explain the higher amount of side reactions occurring at the beginning of the deposition.
Bibliographical noteFunding Information:
This study was financially supported by a Kamin grant 52694-5 from the Israel Ministry of Economy. N. M. thanks the Binational Science Foundation (BSF) and Tel-Aviv University Center for Nanoscience and Nanotechnology for awarding her with Prof. R. Rahamimoff and with TAU-NU travel grants, respectively. The partial support by the Focal Technology Area through the Israel National Nanotechnology Initiative (INNI) is acknowledged, as a support from the U.S. National Science Foundation (DMR-10968). The authors thank Dr. Larisa Burstein from the Wolfson Applied Materials Research Centre at Tel-Aviv University for the XPS characterization service. The Harvey M. Krueger Family Centre for Nanoscience and Nanotechnology of the Hebrew University is acknowledged.
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- Calcium phosphate (CaP)
- hydroxyapatite (HAp)
- self- assembled monolayers (SAMs)