Electrokinetic effects in catalytic platinum-insulator Janus swimmers S. Ebbens, D. A. Gregory, G. Dunderdale, J. R. Howse, Y. Ibrahim, T. B. Liverpool and R. Golestanian EPL, 106 5 (2014) 58003 Published online: 09 June 2014 DOI: 10.1209/0295-5075/106/58003