The researchers created these size-tailored nanoclusters by making use of the Leidenfrost effect, an event often observed in the kitchen while cooking. If you drop some water on a hot plate, droplets hover over the surface instead of making physical contact with it. In the Leidenfrost effect, a liquid close to an object much hotter than the liquid's boiling point produces an insulating vapour layer, preventing the liquid from boiling rapidly.
“The dynamic underwater chemistry seen in nature is inspiring for the next generation of eco-friendly nanochemistry. In this context, green synthesis of size-tailored nanoparticles in a facile and scalable manner via a dynamic process has not been introduced so far,” said Mady Elbahri, professor of nanochemistry and nanoengineering at Aalto University.
“We demonstrate the Leidenfrost dynamic chemistry occurring in an underwater overheated confined zone as a new tool for customised creation of nanoclusters of zinc peroxide. The hydrodynamic nature of the phenomenon ensures eruption of the nanoclusters towards a much colder region, giving rise to growth of monodisperse, size-tailored nanoclusters,” Elbahri continued.
“Our study can pave the way for sustainable synthesis of monodispersed particles,” explained Ramzy Abdelaziz, a postdoctoral researcher in Elbahri's group and coauthor of the study.
From a biomedical perspective, peroxides act as an oxygen supplier and thus can be exploited in treatment of a wide variety of diseases induced by anaerobic and even cancerous cells.
Having synthesised the monodispersed ZnO2 particles, the researchers performed a series of initial experiments to determine the impact of these nanoparticles on cancerous and normal, healthy cells. According to their study, ZnO2 nanoparticles have the potential to kill tumor cells by apoptotic and non-apoptotic mechanisms.
The study was published today in Nature Communications.
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