Nucleation and growth of hydroxyapatite on arc-deposited TiO2surfaces studied by quartz crystal microbalance with dissipation
2013 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 284, 1-6 p.Article in journal (Refereed) Published
Understanding of nucleation and growth kinetics of biomimetically deposited hydroxyapatite (HA) oncrystalline TiO2surfaces is important with respect to the application and performance of HA as functionalimplant coatings. Arc-evaporation was used to deposit TiO2coatings dominated by anatase phase, rutilephase or their mixtures. Subsequent formation of HA from phosphate buffered saline solution (PBS) wasinvestigated in real-time using in situ quartz crystal microbalance with dissipation technique (QCM-D). Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were employed to characterize thepresence, morphology and crystal structure of TiO2coatings and the formed HA. Increasing temperature ofthe PBS, increasing flow rate and applying a higher ion concentration in solution were found to accelerateHA nucleation process and hence affect growth kinetics. Lower PBS temperature resulted in the formationof HA coatings with flake-like morphology and increasing HA porosity. All TiO2coatings under studyenabled HA formation at body temperature, while in contrast Ti reference surfaces only supported HAnucleation and growth at elevated temperatures. QCM-D technique is a powerful tool for studying theimpact of process parameters during biomimetic coating deposition on coating structure evolution in realtime and provides valuable information for understanding, optimizing as well as tailoring the biomimeticHA growth processes.
Place, publisher, year, edition, pages
2013. Vol. 284, 1-6 p.
Research subject Engineering Science with specialization in Nanotechnology and Functional Materials
IdentifiersURN: urn:nbn:se:uu:diva-208512DOI: 10.1016/j.apsusc.2013.06.062ISI: 000324248600001OAI: oai:DiVA.org:uu-208512DiVA: diva2:652872