Picture of an optical laser setup illuminated in green laser light.
56 mg gold platelet next to a 1 cent coin and a colloid with 58mg of gold inside.
56 mg gold platelet next to a 1 cent coin and a colloid with 58mg of gold inside.

How much Gold is in this bottle? Guessing-Contest

We finished drawing the winners! 
The three closed guesses were given by the following IDs:


If you are one of lucky ones, please mail us under with the subject WissensnachtRuhr and tell us the name with which you participated.

For everyone else: The bottle contained 58.35 mg (0,05835 g) Gold, which, only counting the material costs, is worth about 1,92€. ​We made some tangible comparison photos, you'll find here.

Can you calculate back to this mass (roughly) with this hints given?

Volume: 1 litre
Number of Particles: 721.
Size of nanoparticles (Diameter) d=20 nanometres)

From left: Andrea Pfister, Dr. Harald Weiß, Altana-laureate: Dr. Sven Reichenberger, Dennis Oprych

[07.06.2018] Congratulations to our vice group leader Dr. Sven Reichenberger! He won the ALTANA young chemist prize (Jungchemikerpreis) for his doctoral thesis. The ALTANA young chemist prize is awarded to the best sicentific work in the chemical department of the HS Niederrhein under the patronage of the society of german chemists (GDCh) and comes with 1000 € prize money. In his thesis Dr. Reichenberger combined producing nanoparticles by laser ablation with supercritical CO2 to support them on porous materials which is considered very innovative.

mehr zuDr. Sven Reichenberger wins ALTANA...

Picture of Sebastian Kohsakowski showing him smiling and holding up a glass of wine next to his price he won for the best poster in the german catalyst meeting in weimar.

Sebastian Kohsakowski receives best poster award

[15.03.2018] At the 51st annual meeting of german catalyst researchers 2018 (51. Jahrestreffen Deutscher Katalytiker 2018) Sebastian Kohsakowski received an award for the best poster from the german society for catalysis (Deutsche Gesellschaft für Katalyse GeCatS). He presented results from his current research topic where he established a continuous and contamination-free process chain to a laser-synthesized heterogeneous catalyst.

The german society for catalysis is the central interest group of the german community of catalyst researchers counting 1100 members. It is part of the society of german chemists (Gesellschaft Deutscher Chemiker (GDCh).

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