an invisible (infrared) pulsed laser beam transmits a liquid (water) and is ablating a solid (gold) releasing stable nanoparticles (positively charged gold nanoparticle with negative solvatisation zeta potential) .

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Comment by Dr. Stephan Barcikowski on May 18, 2009 at 4:02pm
Hello,
the size is tunable by the laser fluence and, if desired, addition of quenching molecules.
Laser wavelength is infrared (800 nm) and average power a few watt with peakpower in the Tera-watt region.
Details on size tuning and experimentals may be fount in:
S. Petersen, S. Barcikowski In-situ Bioconjugation - Single Step Approach to Tailored Nanoparticle-Bioconjugates by Ultrashort Pulsed Laser Ablation. Adv. Funct. Mater. 2009, 19, 1–6

Regards, Stephan

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Comment by Paolo Nenzi on May 18, 2009 at 9:14am
Hello,

Really insteresting application. Can you tell us more (e.g. obtainable particle dimensions) and LASER power/wavelength ?

Thanks,
Paolo Nenzi

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