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US 2013/0157846 A1Published application
Carbon coated silica particles and methods of making same
AssigneeRegents of the University of Minnesota
InventorsPeter W. Carr, Alon V. McCormick, Changyub Paek
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Abstract
Methods using homogeneous precipitation of a metal on a surface of a particle to prepare silica particles having the metal adsorbed thereon are disclosed herein. In certain embodiments, the silica particles having the metal adsorbed thereon can be used to prepare carbon coated silica particles. The carbon coated silica particles can be useful in a wide variety of applications including, for example, for use as sorbents in chromatography.
Claims31
A method of preparing silica particles having a metal adsorbed thereon, the method comprising:
- dispersing silica particles in an aqueous liquid having a pH of less than or equal to 7;
- adding a soluble source for one or more metal cations to the aqueous liquid having the silica particles dispersed therein;
- and
- increasing the pH of the aqueous liquid with the metal cations and the silica particles dispersed therein sufficiently slowly to provide homogeneous precipitation of the metal on a surface of the silica particles and form the silica particles having the metal adsorbed thereon.
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A carbon coated silica particle comprising:
- a silica particle;
- two monolayers or less of aluminum (III) cations on the surface of the silica particle;
- and
- a layer of carbon deposited over the aluminum (III) cations on the surface of the silica particle,
- wherein the carbon coated silica particle comprises 15 to 50 wt. % carbon.
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Dependencies are inferred from the claim text.