Comparison of atomic force microscopy and zeta potential derived surface charge density M. Herzberg, S. Dobberschütz, D. Okhrimenko, N. E. Bovet, M. P. Andersson, S. L. S. Stipp and T. Hassenkam EPL, 130 3 (2020) 36001 Published online: 01 June 2020 DOI: 10.1209/0295-5075/130/36001