Patent ID: 7498178

Claim:
A method of preparing a fine, diamond particle for immobilizing virus, prepared by the steps comprising: preparing an initial mixture including a crude material including a diamond particle and water by means of explosion of a detonating agent; subjecting the initial mixture to an oxidation treatment by using nitric acid to obtain a suspension liquid including a first aggregation of the diamond particle; adding a basic material into the suspension liquid to neutralize the suspension liquid to generate a gas, in which the first aggregation is divided into a second aggregation of the diamond particle, the second aggregation being smaller than the first aggregation; and purifying the neutralized suspension liquid to obtain a diamond particle made of diamond having a crystalline structure, wherein the diamond particle has a functional group including amino group directly combined on carbon of the diamond particle on a surface thereof, wherein the diamond particle has a specific density in the range of 3.20×10 3 kg/m 3 to 3.40×10 3 kg/m 3 .