The Application of Nanotechnology to food, medical and pharmaceutical industries has received great attention from the scientific community. Nano emulsions are kinetically stable liquid-in-liquid dispersions with droplet sizes on the order of 100 nm. Their small size leads to useful properties such as high surface area per unit volume, robust stability, optically transparent appearance, and tunable rheology. Nano-emulsions are finding application in diverse areas such as drug delivery, food, cosmetics, pharmaceuticals, and material synthesis. High and low energy methods are used to prepare Nano-emulsions. Two important application of Nano-emulsion in food industry include used to encapsulate various lipophilic functional ingredients such as vitamins, flavors, colors, antioxidants, preservatives, and nutraceuticals and advantages in application as delivery systems for bioactive compounds. Antimicrobial activity of Nano-emulsion has been widely reported in the food field to prevent equipment, packaging, or products from contamination for their nonthermal preservation methods, which could reserve the textural properties and nutritional values in the maximum level. It has been confirmed that Nano-emulsions possess a wide antimicrobial activity against various food pathogens.in addition NE has an important role in delivery many kind of drug the formulations were developed to enhance oral bioavailability of hydrophobic drugs. NEs have recently become increasingly important as potential vehicles for the controlled delivery of cosmetics and for the optimized dispersion of active ingredients in particular skin layers.in addition NEs as a prophylactic medication, a human protective treatment, to protect people exposed to bioattack pathogens such as anthrax and Ebola and NEs are being used to deliver either recombinant proteins or inactivated organisms to a mucosal surface to produce an immune response. A breakthrough nontoxic disinfectant cleaner for use in commercial markets that include healthcare, hospitality, travel, food processing, and military applications has been developed by enviro Systems, Inc. that kills tuberculosis and a wide spectrum of viruses, bacteria and fungi in 5-10 min without any of the hazards posed by other categories of disinfectants. In another hand NEs are a new method for the delivery of oil-soluble substances to mammalian cell cultures. The development of NE will be improved increasingly in coming years.

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