울라스토나이트 생체소재의 졸겔 합성 및 스핀코팅법을 이용한 티타늄계 기판의 표면 개질
Sol synthesis of wollastonite bioceramics and surface modification of titanium-based substrate by sol-gel/spin coating
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Wollastonite sol for surface coating was synthesized using a sol-gel method, and then the surface of Ti-6Al-4V alloy was modified by spin coating to improve the bone forming ability and bone bonding characteristics. Wollastonite sol was synthesized from TEOS (Tetraethyl Orthosilicate) and calcium nitrate hydrate and modified the substrate surface by sol-gel/spin method after PEO (Plasma Electrolitic Oxidation) treatment. Porous TiO2 and wollastonite thin film were observed on the surface of commercial titanium-based substrate by the PEO treatment and sol-gel/spin coating. We confirmed that substrate surfaces were modified with a homogeneous wollastonite coating layer, improving the hydroxyapatite precipitation ability on the specimen surface compared to the commercial titanium substrate. Surface properties of coating layer, for examples, microstructure, roughness, and wetting angle depended on the coating thickness varied with repeated cycles. From in vitro test, the dissolution and precipitation of hydroxyapatite particles into SBF solution, also depended on the coating materials and coating thickness.
Abstract
Wollastonite sol for surface coating was synthesized using a sol-gel method, and then the surface of Ti-6Al-4V alloy was modified by spin coating to improve the bone forming ability and bone bonding characteristics. Wollastonite sol was synthesized from TEOS (Tetraethyl Orthosilicate) and calcium nitrate hydrate and modified the substrate surface by sol-gel/spin method after PEO (Plasma Electrolitic Oxidation) treatment. Porous TiO2 and wollastonite thin film were observed on the surface of commercial titanium-based substrate by the PEO treatment and sol-gel/spin coating. We confirmed that substrate surfaces were modified with a homogeneous wollastonite coating layer, improving the hydroxyapatite precipitation ability on the specimen surface compared to the commercial titanium substrate. Surface properties of coating layer, for examples, microstructure, roughness, and wetting angle depended on the coating thickness varied with repeated cycles. From in vitro test, the dissolution and precipitation of hydroxyapatite particles into SBF solution, also depended on the coating materials and coating thickness.
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