The effect of heat treatment on superhydrophilicity of TiO2 nano thin films A. A. Ashkarran and M. R. Mohammadizadeh Eur. Phys. J. Appl. Phys., 40 2 (2007) 155-162 Published online: 31 October 2007 DOI: 10.1051/epjap:2007149