Abstract
Continuous layers of hydroxyapatite were deposited on silk cloth from aqueous solutions by using urease as the precipitant supplier. Silk cloth was surface-modified with urease and was immersed in an aqueous solution containing Ca2+, PO4(3-) , and urea. As urea was hydrolyzed to form ammonia with the aid of the immobilized urease, hydroxyapatite precipitated predominantly on the surface of the silk cloth. It took only a few hours to form continuous layers of hydroxyapatite on the silk cloth. The resultant hydroxyapatite was found to be bone-like apatite because it had low crystallinity, contained carbonate ion in the lattice, and had a calcium-deficient composition.
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