Nav: Home

Nanoparticles can grow in cubic shape

April 04, 2016

The efficiency of many applications deriving from natural sciences depends dramatically on a finite-size property of nanoparticles, so-called surface-to-volume ratio. The larger the surface of nanoparticles for the same volume is achieved, the more efficiently nanoparticles can interact with the surrounding substance. However, thermodynamic equilibrium forces nanostructures to minimize open surface driven by energy minimization principle. This basic principle predicts that the only shape of nanoparticles can be spherical or close-to-spherical ones.

Nature, however, does not always follow the simple principles. An intensive collaboration between University of Helsinki, Finland, and Okinawa Institute of Science and Technology, Japan, showed that in some condition iron nanoparticles can grow in cubic shape. The scientists also succeeded in disclosing the mechanisms behind this.

"Now we have a recipe how to synthesize cubic shapes with high surface-to-volume ratio which opens the door for practical applications", says Dr. Flyura Djurabekova from the University of Helsinki.

In the researcher's work, experiment and theory were brought together via a new mathematical model, which gives a recipe on how to select macroscopic experimental conditions to achieve the formation of nanoparticles of desired shape.

The computational work carried out in the group of Djurabekova showed the importance of kinetical processes in this surprising phenomenon, namely the competition between surface diffusion and deposition rate of atoms. The simulations showed how an originally spherical nucleus transforms into a perfect cube.

The results were recently published in the high-impact factor journal ACS Nano.
-end-
Junlei Zhao, Ekaterina Baibuz, Jerome Vernieres, Panagiotis Grammatikopoulos, Ville Jansson, Morten Nagel, Stephan Steinhauer, Mukhles Sowwan, Antti Kuronen, Kai Nordlund, and Flyura Djurabekova, Formation Mechanism of Fe Nanocubes by Magnetron Sputtering Inert Gas Condensation, ACS Nano, Article ASAP, DOI: 10.1021/acsnano.6b01024, Publication Date (Web): March 10, 2016, Copyright © 2016 American Chemical Society

http://pubs.acs.org/doi/suppl/10.1021/acsnano.6b01024

Image text: Originally close-to-spherical iron nanoparticle nuclei grow in magnetron sputter chambers either cubic or spheres. The research revealed a specific regime of temperature and deposition rates leading to thermodynamically unexpected cubic shapes of final nanoparticles.

Image: Panagiotis Grammatikopoulos, Okinawa Institute for Science and Technology

For more information:

Dr. Flyura Djurabekova, Department of Physics, University of Helsinki, +358-(0)2941-50084, flyura. djurabekova@helsinki.fi

With kind regards,
Minna Meriläinen-Tenhu, Press Officer, University of Helsinki, @MinnaMeriTenhu, +358 50 415 0316, minna.merilainen@helsinki.fi

University of Helsinki

Related Nanoparticles Articles:

Chemists perform surgery on nanoparticles
A team of chemists led by Carnegie Mellon's Rongchao Jin has for the first time conducted site-specific surgery on a nanoparticle.
Nanoparticles remain unpredictable
The way that nanoparticles behave in the environment is extremely complex.
Gold standards for nanoparticles
KAUST researchers reveal how small organic 'citrate' ions can stabilize gold nanoparticles, assisting research on the structures' potential.
Lipid nanoparticles for gene therapy
Twenty-five years have passed since the publication of the first work on solid lipid nanoparticles (SLNs) and nanostructured lipid carriers (NLCs) as a system for delivering drugs.
Nanoparticles hitchhiking their way along strands of hair
In shampoo ads, hair always looks like a shiny, smooth surface.
Better contrast agents based on nanoparticles
Scientists at the University of Basel have developed nanoparticles which can serve as efficient contrast agents for magnetic resonance imaging.
Gentle cancer treatment using nanoparticles works
Cancer treatments based on laser irridation of tiny nanoparticles that are injected directly into the cancer tumor are working and can destroy the cancer from within.
Radiation-guided nanoparticles zero in on metastatic cancer
Zap a tumor with radiation to trigger expression of a molecule, then attack that molecule with a drug-loaded nanoparticle.
Nanoparticles can grow in cubic shape
Use of nanoparticles in many applications, e.g. for catalysis, relies on the surface area of the particles.
Nanoparticles deliver anticancer cluster bombs
Scientists have devised a triple-stage 'cluster bomb' system for delivering the chemotherapy drug cisplatin, via tiny nanoparticles designed to break up when they reach a tumor.

Related Nanoparticles Reading:

Nanoparticles: From Theory to Application
by Günter Schmid (Editor)

Nanoparticles - Nanocomposites – Nanomaterials: An Introduction for Beginners
by Dieter Vollath (Author)

Nanoparticle Superheroes Defeat Evil Microbes
by Anna Rutkowski (Author)

Nanoparticle Heat Transfer and Fluid Flow
by W. J. Minkowycz (Editor), E M Sparrow (Editor), J. P. Abraham (Editor)

Gold Nanoparticles for Physics, Chemistry and Biology
by Catherine Louis (Author), Catherine Louis (Editor), Olivier Pluchery (Editor)

Nanoparticles (de Gruyter Textbook)
by Raz Jelinek (Author)

Self -Assembly: From Surfactants to Nanoparticles (Wiley Series on Surface and Interfacial Chemistry)
by Ramanathan Nagarajan (Author)

Nanoparticle Technology Handbook
by Makio Naito (Editor), Toyokazu Yokoyama (Editor), Kouhei Hosokawa (Editor), Kiyoshi Nogi (Editor)

SIlver Nanoparticles: Properties, Synthesis Techniques, Characterizations, Antibacterial and Anticancer Studies (Biomedical & Nanomedical Technologies Concise Monograph)
by Rajawat Shweta (Author), Malik M.M. (Author)

Bio-Nanoparticles: Biosynthesis and Sustainable Biotechnological Implications
by Om V. Singh (Editor)

Best Science Podcasts 2018

We have hand picked the best science podcasts for 2018. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

Hacking The Law
We have a vision of justice as blind, impartial, and fair — but in reality, the law often fails those who need it most. This hour, TED speakers explore radical ways to change the legal system. Guests include lawyer and social justice advocate Robin Steinberg, animal rights lawyer Steven Wise, political activist Brett Hennig, and lawyer and social entrepreneur Vivek Maru.
Now Playing: Science for the People

#495 Earth Science in Space
Some worlds are made of sand. Some are made of water. Some are even made of salt. In science fiction and fantasy, planet can be made of whatever you want. But what does that mean for how the planets themselves work? When in doubt, throw an asteroid at it. This is a live show recorded at the 2018 Dragon Con in Atlanta Georgia. Featuring Travor Valle, Mika McKinnon, David Moscato, Scott Harris, and moderated by our own Bethany Brookshire. Note: The sound isn't as good as we'd hoped but we love the guests and the conversation and we wanted to...