A simple demonstration of the importance of purity in nanotechnology with the example of rapid syntheses of gold nanoparticles in water
Year: 2026
Type: preprint
Abstract: A simple and visual demonstration of the importance of purity and the impact of impurities in nanotechnology is described. Stable colloidal gold nanoparticles are simply obtained at room temperature in seconds, adding NaBH4 to HAuCl4 in water without the need for other chemicals. By adjusting the conductivity of the water used, for example by using high purity water, tap water or mixtures of the two in different ratios, the size and stability of the nanoparticles is easily tuned. Size control is easily assessed by the color of the colloids obtained and/or by UV-vis spectroscopy. This undergraduate level demonstration suitable for a wide audience requires only very simple equipment and can be broadly implemented to illustrate the importance of controlled conditions in nanotechnology, raise awareness on the impact of impurities, but also show how to leverage on negative results to turn a drawback into a benefit. Additionally, the concept and the experimental approach proposed integrate well in other pedagogical activities and are a solid foundation to link nanotechnology to other important topics in the education of the chemical sciences.
Source: ChemRxiv
Authors: Javier Eiroa Soto, Jonathan Quinson
Institution: Universidade da Coruña
Language: English
Subfield: Education
Field: Social Sciences
Domain: Social Sciences
Open Access status: green
OpenAlex ID: W7211934873