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SPACE MEDICINE
Researchers create anticancer nanomaterials by simulating underwater volcanic conditions
by Staff Writers
Helsinki, Finland (SPX) May 16, 2017


Leidenfrost effect makes water droplets on a hot plate hover over the surface instead of making physical contact with it. Credit Aalto University / Mikko Raskinen

Researchers at Aalto University, Finland, have developed anticancer nanomaterials by simulating the volcano-induced dynamic chemistry of the deep ocean. The novel method enables making nanoclusters of zinc peroxide in an environmentally friendly manner, without the use of additional chemicals. The as-synthesised zinc peroxide nanoparticles can be used as a tool for cancer therapy and against other complicated diseases.

The researchers have created these size-tailored nanoclusters by making use of the Leidenfrost effect. It is an event commonly 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. Near volcano gates deep in the ocean or under special conditions in the lab, the vapour layer can cover a large area without rising away from the surface, while making the molecules in the liquid above behave in an exceptional way.

'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', tells Professor Mady Elbahri 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', continues Elbahri.

'Our study can pave the way for sustainable synthesis of monodispersed particles', explains Ramzy Abdelaziz, a postdoctoral researcher at 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.

'Our nanoparticles have been investigated in terms of cytotoxic effect on suspension and adherent cells to prove their applicability as cancer nanotherapeutics', says Duygu Disci-Zayed, a former research group member.

Having synthesised the monodispersed ZnO2 particles, the researchers performed a series of initial experiments to determine the impact of these nanoparticles on the cancer, and normal, healthy cells. According to their study, ZnO2 nanoparticles have the potential to kill tumor cells by apoptotic and non-apoptotic mechanisms.

Research paper

SPACE MEDICINE
Astronauts experience decrease in blood vessel function during spaceflight
Manhattan KS (SPX) May 10, 2017
Astronauts aboard the International Space Station have decreased physical fitness because of a decrease in the way oxygen moves through the body, according to a Kansas State University kinesiology study. Carl Ade, assistant professor of exercise physiology, and collaborators partnered with the Johnson Space Center to find that astronauts' exercise capacity decreases between 30 and 50 perce ... read more

Related Links
Aalto University
Space Medicine Technology and Systems

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