Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Gold and silica nanostars imitate the two faces of the god Janus

Two examples of nanostars with one silicon oxide face (bluish) and another with golden branches (yellow).Credit: Liz-Marzán et al.
Two examples of nanostars with one silicon oxide face (bluish) and another with golden branches (yellow).

Credit: Liz-Marzán et al.

Abstract:
Researchers from the Basque centre CIC biomaGUNE and the University of Antwerp (Belgium) have designed nanoparticles with one half formed of gold branches and the other of silicon oxide. They are a kind of Janus particle, so-called in honour of the Roman god with two faces, which could be used in phototherapy in the future to treat tumours.

Gold and silica nanostars imitate the two faces of the god Janus

Madrid, Spain | Posted on February 12th, 2014

In Roman mythology, Janus was the god of gates, doors, beginnings and transitions between the past and the future. In fact, the first month of the year, January (from the Latin, ianuarĭus), bears his name. This deity was characterised by his profile of two faces, something which has inspired scientists, when naming their chemical designs with two clearly distinct components.

Now, a team of researchers from CIC biomaGUNE in San Sebastian, together with colleagues from the Belgian University of Antwerp, have created Janus particles of nanometric size. They are constituted by silicon oxide on one side and gold points on the other.

As Luis Liz-Marzán, the main author of this study published in the journal ‘Chemical Communications', explains to SINC: "These nanostars have optical and electronic properties determined largely by their small dimensions and their morphology."

The researchers have come up with techniques to mould the sharp gold points from nanoparticles of this metal, such that very intense electric fields can be generated on the gold points using light.

"Our research is basic science, but these fields are used in processes of ultrasensitive detection to identify negligible quantities of molecules that can be absorbed on the gold face as contaminants or biomarkers that indicate the presence of a disease," says Liz-Marzán.

Another possible application is phototherapy, the object of which is to kill malignant cells using heat, in this case induced by lighting the gold points. The oxide face would be used to join the nanostars to specific biological receptors that would take them to the damaged cells and only to these, so that the metal part can exercise its therapeutic or diagnostic function.

These nanoparticles are produced in various stages. First, golden nanospheres are produced by the chemical reduction of a salt from the precious metal. Then, two different organic compounds are added on opposite sides of the particle in order to give them distinct affinity due to the silicon oxide. In this way, the oxide covers only one part and the other remains uncovered in order to let the golden points grow.

Full bibliographic information

Denis Rodríguez-Fernández, Thomas Altantzis, Hamed Heidari, Sara Bals, Luis M. Liz-Marzán. "A protecting group approach toward synthesis of Au-silica Janus nanostars". Chemical Communications 50: 79-81, 2014. DOI: 10.1039/C3CC47531J.

####

About Plataforma SINC
The Scientific Information and News Service (Servicio de Información y Noticias Científicas - SINC), is a new public and nationwide multimedia scientific news platform supported by an open source software tool based in Spain. The primary objective behind the creation of SINC is to increase the number of high quality scientific news items in the media, as a means of bringing the public closer to science.

For more information, please click here

Contacts:
Para contactar con el investigador:
Luis M. Liz-Marzán
CIC biomaGUNE
Telf.: +34 943 005 300


Enrique Sacristan

Copyright © AlphaGalileo

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

New nano approach could cut dose of leading HIV treatment in half February 24th, 2017

Atom-scale oxidation mechanism of nanoparticles helps develop anti-corrosion materials February 24th, 2017

Atomic force imaging used to study nematodes: KFU bionanotechnology lab (head - Dr. Rawil Fakhrullin) has obtained 3-D images of nematodes' cuticles February 23rd, 2017

Particle Works creates range of high performance quantum dots February 23rd, 2017

Nanomedicine

New nano approach could cut dose of leading HIV treatment in half February 24th, 2017

Atomic force imaging used to study nematodes: KFU bionanotechnology lab (head - Dr. Rawil Fakhrullin) has obtained 3-D images of nematodes' cuticles February 23rd, 2017

Nominations Invited for $250,000 Kabiller Prize in Nanoscience: Major international prize recognizes a visionary nanotechnology researcher February 20th, 2017

Good vibrations help reveal molecular details: Rice University scientists combine disciplines to pinpoint small structures in unlabeled molecules February 15th, 2017

Discoveries

New nano approach could cut dose of leading HIV treatment in half February 24th, 2017

Atom-scale oxidation mechanism of nanoparticles helps develop anti-corrosion materials February 24th, 2017

Atomic force imaging used to study nematodes: KFU bionanotechnology lab (head - Dr. Rawil Fakhrullin) has obtained 3-D images of nematodes' cuticles February 23rd, 2017

Molecular phenomenon discovered by advanced NMR facility: Cutting edge technology has shown a molecule self-assembling into different forms when passing between solution state to solid state, and back again - a curious phenomenon in science - says research by the University of Wa February 22nd, 2017

Announcements

New nano approach could cut dose of leading HIV treatment in half February 24th, 2017

Atom-scale oxidation mechanism of nanoparticles helps develop anti-corrosion materials February 24th, 2017

Atomic force imaging used to study nematodes: KFU bionanotechnology lab (head - Dr. Rawil Fakhrullin) has obtained 3-D images of nematodes' cuticles February 23rd, 2017

Particle Works creates range of high performance quantum dots February 23rd, 2017

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

New nano approach could cut dose of leading HIV treatment in half February 24th, 2017

Atom-scale oxidation mechanism of nanoparticles helps develop anti-corrosion materials February 24th, 2017

Molecular phenomenon discovered by advanced NMR facility: Cutting edge technology has shown a molecule self-assembling into different forms when passing between solution state to solid state, and back again - a curious phenomenon in science - says research by the University of Wa February 22nd, 2017

Tiny nanoclusters could solve big problems for lithium-ion batteries February 21st, 2017

Research partnerships

Molecular phenomenon discovered by advanced NMR facility: Cutting edge technology has shown a molecule self-assembling into different forms when passing between solution state to solid state, and back again - a curious phenomenon in science - says research by the University of Wa February 22nd, 2017

Graphene foam gets big and tough: Rice University's nanotube-reinforced material can be shaped, is highly conductive February 13th, 2017

Cedars-Sinai, UCLA Scientists Use New ‘Blood Biopsies’ With Experimental Device to Speed Cancer Diagnosis and Predict Disease Spread: Leading-Edge Research Is Part of National Cancer Moonshot Initiative February 13th, 2017

Highly sensitive gas sensors for volatile organic compound detection February 6th, 2017

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project