Pickering emulsion and method of preparing the same

A pickering emulsion comprising:

• 0.01-20 wt % of metal or non-metal particles having an average particle diameter of 10 nm-100 μm and being not surface-treated, and 0.01-20 wt % of a non-ionic water-soluble polymer, based on a total weight of the emulsion, wherein the particles are positioned on an oil droplet surface,
• wherein the emulsion does not comprise a surfactant,
• wherein an oil phase of the pickering emulsion is a dispersed phase, a water phase of the pickering emulsion is a continuous phase and comprises the non-ionic water-soluble polymer and water, and the oil phase accounts for 74 vol % or more, based on a total volume of the emulsion,
• wherein the non-ionic water-soluble polymer has a weight average molecular weight of 100-30,000 g/mol and is any one or two or more selected from the group consisting of polyethylene glycol, polyethylene propylene glycol, polyoxypropylene glycol, polyethylene glycol diacrylate, polyethylene glycol dimethyl ether, polyvinyl alcohol and polyacrylamide, and
• wherein the metal particles are any one or two or more selected from the group consisting of Groups 3 to 12 transition metal particles, Groups 13 to 16 post-transition metal particles and oxides thereof, and the non-metal particles are any one or two or more selected from the group consisting of polystyrene particles, polycarbonate particles, polyamide particles, polyimide particles, polyurethane particles, silica particles, solid glass particles, and ceramic particles.