Method for Forming Nano-bubble

A method for forming a nano-bubble, the method comprising:

• taking an inorganic particle as a nucleus and performing a polymer coating process to coat at least one first polymer on the surface of the nucleus to form an organic/inorganic composite particle;
• having the organic/inorganic composite particle contact with a first solvent and removing the nucleus of the organic/inorganic composite particle by way of the dissolution of the first solvent to form an impregnated nano-particle wherein the inside of the impregnated nano-particle comprises the first solvent;
• performing a freeze-drying process to remove the first solvent to have the impregnated nano-particle form a hollow nano-particle;
• and
• performing a dissolution process to dissolve the hollow nano-particle in a second solvent to form the nano-bubble.