Health

Stable Dispersions of Aromatic Hydrocarbon Colloidal Par ticles by Laser Ablation

Publikation aus Health

Köstler S., Rudorfer A., Berghauser R., Jakopic G., Ribitsch V.

Mater. Sci. Forum, 2005

Abstract:

Polycyclic aromatic hydrocarbons are a very interesting class of materials. They show a very broad range of very interesting properties like intensive colour, fluorescence, photoconductivity, semiconducting properties and a very special chemical and photochemical behaviour. Therefore these materials are often used for pigments and dyes, fluorescent probes, etc. and they are promising materials for sensors, bioprobes, devices, and so on. In the last few years research on different kinds of organic nanoparticles is steadily increasing. Even so, preparation methods for these particles are not very well established yet. Two different methods have been usually employed to prepare such particles. These are reprecipitation by adding a solution of the substance to a non-solvent and evaporation-condensation processes in vacuo. Only recently, laser ablation, has been used to prepare organic microcrystals in aqueous media. The use of surfactants was found to greatly enhance the performance of particle formation and the stability of the dispersions. In this work we investigated the influence of different ionic and non-ionic surfactants and of laser fluence on the rate of particle formation.

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