Stable Dispersions of Aromatic Hydrocarbon Colloidal Particles by Laser Ablation
Dispersions of colloidal particles of polycyclic aromatic hydrocarbons were obtained by nanosecond laser ablation. Aqueous suspensions of micron-sized crystals were irradiated with the second harmonic output of a Nd:YAG laser and converted into colloidal particles. Ionic and nonionic surfactants were used in the ablation process to stabilise the particles. Dispersions with good long term stability were obtained. A strong dependence of particle formation rate on laser fluence was found and the particle formation process is discussed on the basis of UV-Vis spectra and microscopic examination of the crystals.
Paula Maria Vilarinho
S. Köstler et al., "Stable Dispersions of Aromatic Hydrocarbon Colloidal Particles by Laser Ablation", Materials Science Forum, Vols. 514-516, pp. 1235-1240, 2006