A novel method for producing unequal sized droplets in micro- and nanofluidic channels Ahmad Bedram, Ali Moosavi and Siamak Kazemzadeh Hannani Eur. Phys. J. E, 38 9 (2015) 96 Published online: 11 September 2015 DOI: 10.1140/epje/i2015-15096-1