Abstract
CaO‐SiO2 glass‐ceramic spheres were prepared by an electrospray method using hydrolyzed silicon alkoxide containing calcium nitrate. Crystalline calcium silicates, such as Ca2SiO4 and β‐CaSiO3, formed around the surface of the spheres after heat treatment. The dissolution of the crystal phase of the spheres caused the release of Ca2+ and Si4+ ions during the initial stage of soaking in Tris‐buffer solution, leading to the formation of nanosized pores at the sphere surface. The incorporation of Ca2+ ions into the glassy phase of the spheres suppressed the rapid pH increase during the initial stage of soaking in Tris‐buffer solution.
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