Stable Dispersions of Aromatic Hydrocarbon Colloidal Particles by Laser Ablation

Abstract:

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.

• Periodical: Materials Science Forum (Volumes 514-516)
• Pages: 1235-1240
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.514-516.1235
• Online since: May 2006
• Authors: Stefan Köstler, Andreas Rudorfer, Roswitha Berghauser, Volker Ribitsch, Georg Jakopic
• Keywords: Dispersion, Laser Ablation, Nanoparticle, Polycyclic Aromatic Hydrocarbons (PAHs), Surfactant

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