Nanoemulsion Contains Ultrasmall Droplets (IMAGE) Michigan Medicine - University of Michigan Caption High energy oil-in-water emulsions used in the U-M vaccines are made up of droplets 200 nanometers in size. Credit Michigan Nanotechnology Institute Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.