Patent ID: 9533354
Date: 2017-01-03
CPC Classifications: B22F,Y10T

Claim:
1. A method of detecting a strong acid comprising: preparing mono-dispersed hydrophobic gold nanoparticles with 11 to 54 nm of average radius; preparing dispersed solution by dispersing the hydrophobic gold nanoparticles in chloroform; adding aqueous solution of 0.05 to 0.5M cetyltrimethyl ammonium bromide to the dispersed solution and magnetic-stirring it; yielding hydrophilic gold nanoparticles by separating centrifugally the mixture in which a reaction is completed and removing remaining surfactant; and adding an aqueous solution containing hydrochloric acid to a test tube where the hydrophilic gold nanoparticles are immersed, heating the test tube at 500° C.˜1000° C. for 5 to 10 minutes and then observing color changes within the test tube, wherein the step of heating the test tube uses an oven, heater or a heating wire detachable and attachable to the test tube as a heat source.