| Summary: | 碩士 === 大同大學 === 材料工程學系(所) === 97 === Hydroxyapatite (HAp) is becoming increasingly popular as a passive material on grafts such as surgical implants in the orthopedic and dental fields. Hydroxyapatite (HAp) has been extensively applied because of its superior biocompatibility and bioactivity. This study investigate into the coating of the biomedical calcium phosphate on the bamboo charcoal and stainless steel substrate in a 0.042 M (Ca(NO3)2) and 0.025 M (NH4H2PO4) solution under 4 ~ 36 V, 37 ~ 80 ℃ for 30 min to 1 hr. Homogeneous coatings were attained by electrochemical method. This coating technique could be a good control method for the thickness, morphology, crystallinity, and stoichiometry of the deposits. Hydroxide groups on the substrate surface favor the chemical bonding with calcium and phosphate ions to produce HAp coating on the cathode surface.
X-ray diffraction (XRD), Fourier transform infrared spectrometer (FT-IR), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) were used to observe the surface morphology and identify phase of the coating layer. As a result, the increasing deposition rate of HAp followed increasing temperature, time and voltage. HAp layer becomes smoother at high temperature and high voltage. The deposition rate of HAp on stainless steel is between 13.8 mg/hr．cm2 to 36.0 mg/hr．cm2. On the other hand, on bamboo charcoal the deposition rate of HAp is 27.0 mg/hr．cm2 to 47.0 mg/hr．cm2. The rate of bamboo charcoal is better than stainless steel, the reason could be that bamboo is a porous material, and the surface area is bigger. Finally in this study Fibroblast (CCD-966SK) cell line was employed for cell attachment test. After incubating for 3 days the cells are observed great attachment and growth on high temperature and voltage coated HAp layer. This process may be application in medical implant device.
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