Surface characterization of calcium phosphate coating formed on chitosan and alkali-treated titanium metal
박경희, 이운영, 송호준, 박영준,
소속 상세정보
박경희 ( Park Kyung-Hee ) - Chonnam National University School of Dentistry Department of Dental Materials
이운영 ( Lee Woon-Young ) - Chonnam National University School of Dentistry Department of Dental Materials
송호준 ( Song Ho-Jun ) - Chonnam National University School of Dentistry Department of Dental Materials
박영준 ( Park Yeong-Joon ) - Chonnam National University School of Dentistry Department of Dental Materials
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 Ca2+ to attract PO4 3- 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.
키워드
Calcium phosphate; Chitosan; Sodium hydroxide pretreatment; Modified simulated body fluid (m-SBF); Mineralization
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