Determination of the mean surface droplet diameter D[3,2]and droplet size distribution with the use of a Mastersizer 2000 with a HYDRO 2000MU unit (Malvern Instruments Ltd., UK). D[3,2]is the so called Sauter mean diameter and it is defined as the diameter of a sphere that has the same volume-to-surface area ratio as a particle or droplet of interest.