A Novel Two-Step Silica-Coating Process for Engineering Magnetic Nanocomposites
Chemistry of Materials1998Vol. 10(12), pp. 3936–3940
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Abstract
A novel two-step silica-coating process, sol−gel followed by dense liquid coatings, is described. The maghemite surfaces coated with silica, using the two-step process, are characterized by X-ray photoelectron spectroscopy, electrokinetics, leaching test, and magnetization measurement. Compared with the single-step sol−gel or dense-liquid-coating process, the two-step process produces magnetic nanocomposites of the highest protection against acid attack at the lowest level of silica coatings with maximized magnetization.
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