| 摘要 |
<p>Hollow nanoparticles which can be produced at a lower cost and a higher efficiency and which aggregate little into secondary particles and have high dispersibility. Hollow nanoparticles (1) each comprising a silica shell are hollow nanoparticles produced by: coating the surface of calcium carbonate particles (2) in a dry powder state which have a given outer diameter with an organic acid (3) to obtain organic-acid-coated calcium carbonate particles (4) in a dry powder state; dispersing the dry-powder-state particles (4) in diglyme (5) as an organic solvent in which some of the organic acid (3) in the organic-acid-coated calcium carbonate particles (4) can dissolve; mixing the dispersion with a silicon alkoxide (6), ammonia water (8) as a base catalyst, and water (7) to form a silica shell (1b) on the surface of each of the calcium carbonate particles (2) and thereby form silica-coated particles (9); and thereafter dissolving away the calcium carbonate (2), which serves as the cores of the silica-coated particles (9), by means of hydrochloric acid (10) in an acid treatment.</p> |
