Analysis of purification of charged giant vesicles in a buffer using their size distribution Marzuk Ahmed, Mohammad Abu Sayem Karal, Md. Kabir Ahamed and Muhammad Samir Ullah Eur. Phys. J. E, 44 4 (2021) 62 Published online: 28 April 2021 DOI: 10.1140/epje/s10189-021-00071-4