METHOD FOR MANUFACTURING CARBON NANO COLLOIDIAL SOLUTION USING SONO-CHEMISTRY AND ELECTRO-CHEMISTRY, AND CARBON NANO COLLOIDIAL SOLUTION

摘要

A carbon nano colloidal solution is disclosed, which is useful for a black coating to be applied on a surface a cathode-ray tube to improve a contrast of an image display device. The method of preparing the carbon nano colloidal solution includesdisposing a carbon electrode and an opposite electrode in a pure water, and applying electricity to the electrodes and applying supersonic waves to the pure water to synthesize carbon nano particles. The carbon nano particles are hydrophilic and are homogenously dispersed in the pure water, and aldehyde radical and/or carboxyl radial are formed on a surface of the carbon nano particle.