Korean J Dent Mater.  2019 Mar;46(1):33-42. 10.14815/kjdm.2019.46.1.33.

Surface characterization of calcium phosphate coating formed on chitosan and alkali-treaDted titanium metal

• Park KH
• Lee WY
• Song HJ
• Park YJ

• KMID: 2448022
• DOI: http://doi.org/10.14815/kjdm.2019.46.1.33

Abstract

The calcium phosphate coating on various pretreated metals was prepared by soaking in modified simulated body fluid (m-SBF) solution. The coating structure and its surface morphologies were determined by x-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. The results revealed significant differences in morphology and composition of the calcium phosphate coatings with and without chitosan and NaOH-pretreated commercially pure titanium (cp-Ti) substrate. The calcium phosphates formed on chitosan coated-Ti pretreated with NaOH were ~ 350 nm-sized resulting in strong bonding of the apatite layer with the substrates and a uniform gradient of stress transfer from coating materials to the Ti-substrate. After NaOH pretreatment, the hydroxyl groups bind to Ca²âº to attract POâ‚„³â» anions, eventually resulting in a continuous layer of calcium phosphate on chitosan coated-Ti substrate during immersion in m-SBF solution. The chitosan coated-Ti showed hydrophobic surface while NaOH pretreatment resulted in maximum hydrophilicity to the Ti substrate. Due to improved wettability of Ti by NaOH pretreatment before chitosan coating, aggregation of calcium phosphate was prevented and size-controlled composite materials were obtained.

Keyword

Calcium phosphate; Chitosan; Sodium hydroxide pretreatment; Modified simulated body fluid (m-SBF); Mineralization

MeSH Terms

Anions
Body Fluids
Calcium Phosphates
Calcium*
Chitosan*
Clothing
Hydrophobic and Hydrophilic Interactions
Immersion
Metals
Microscopy, Electron, Scanning
Spectroscopy, Fourier Transform Infrared
Titanium*
Wettability
X-Ray Diffraction
Anions
Calcium
Calcium Phosphates
Chitosan
Metals
Titanium