TiO 2 nanoparticles obtained by laser ablation in water: Influence of pulse energy and duration on the crystalline phase

•Laser ablation of Ti in water at 1064nm and comparison of ns and ps temporal regimes.•Structural and spectroscopic characterization of the colloids: TiO2 is the predominant phase.•Determination of an energy window where ps ablation produces more anatase than rutile.•Modelling of the experimental dependence of anatase/rutile yield on pulse length and energy.