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US 5,254,262 AGranted
Carbon-clad zirconium oxide particles
AssigneeRegents of the University of Minnesota
InventorsEric F. Funkenbusch, Peter W. Carr, Douglas A. Hanggi, Thomas P. Weber
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Abstract
Carbon-clad zirconium oxide particles are disclosed which are useful in sorbent applications, particularly as packing materials for High Performance Liquid Chromatography (HPLC). A method for the preparation of chromatographic support material is also disclosed which utilizes low pressure.
Claims11
A method for forming a chromatographic support material utilizing chemical vapor deposition, comprising the steps of:
- (a) placing a plurality of porous inorganic oxide particles having a diameter of about 1-500 microns, a surface area of about 5/14 300 m.sup.2 /g, and a pore diameter of about 20-5000 .ANG. within a reaction chamber;
- (b) elevating the temperature within the reaction chamber and reducing the pressure within the reaction chamber;
- and
- (c) introducing a vapor comprising carbon into the reaction chamber so as to thermally decompose the vapor and deposit a cladding of said carbon onto the particles under conditions so as to yield porous inorganic oxide particles having the exterior surfaces and the surfaces of the pores substantially covered with said carbon cladding and allowing subsequent pore access, thereby enhancing chromatographic utility.
1 more element
Dependencies are inferred from the claim text.