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Extra resources for Bioceramics: Materials and Applications IV, Volume 147
Calcium phosphate coating with different patterns were made on the metallic substrates by combining photolithography technique with ECD. The patterned bio-ceramic coatings are expected to regulate cell attachment and activity and have potential applications in biomedical implants and biosensors. INTRODUCTION Calcium phosphate (CaP) bio-ceramics have been known to be biocompatible and widely used as coatings on metallic prostheses '. Although plasma spray technique 2 has been popular for making CaP coating in the past decade, the coatings usually exhibit substantial cracking due to the high temperature nature of the technique, which seriously affects the reliability and lifetime of the implants.
Bioceramics: Materials and Applications IV 39 Fig. 5. 5 (right). 4. 4. 4. As indicated earlier, it has been suggested that a negative surface charge is favorable for the deposition of hydroxyapatite coatings . 4 indicates that other parameters can also control the process. 8, presumably because of the higher OH concentration, so heterogeneous precipitation on the substrate was limited, leading to a sparse coating. 8 (Fig. 9 μπι, respectively. XRD revealed the phase composition of the coatings to be hydroxyapatite and indicated preferred orientation of the hydroxyapatite crystals (hexagonal structure) with their c-axis nearly perpendicular to the substrate surface.
The plates were then washed with developer AZ400, rinsed with distilled water, and dried with nitrogen stream. Plates with photoresist patterns on the surface were used as cathodes in the ECD process. In some experiments, smooth silicon wafers, instead of titanium, were used for patterned deposition. After electrolysis, plates were removed and rinsed repeatedly with distilled water and followed by rinsing with absolute ethanol and dried in air. For the patterned deposition, plates were first rinsed with acetone to remove the photoresist coating, which was followed by rinsing repeatedly in distilled water and drying in air.
Bioceramics: Materials and Applications IV, Volume 147