Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Nanomaterial for medicine and energy

A new type of nanoparticle resembling the six-pointed Star of David (Magen David) that is the symbol on the flag of Israel has been discovered by researchers at the Hebrew University of Jerusalem.
A new type of nanoparticle resembling the six-pointed Star of David (Magen David) that is the symbol on the flag of Israel has been discovered by researchers at the Hebrew University of Jerusalem.

Abstract:
New nanomaterial, shaped like Stars of David, discovered at Hebrew University, could open way for medical, clean energy applications

Nanomaterial for medicine and energy

Israel | Posted on November 14th, 2010

A new type of nanoparticle resembling the six-pointed Star of David (Magen David) that is the symbol on the flag of Israel has been discovered by researchers at the Hebrew University of Jerusalem. The discovery, the researchers say, may lead to new ways for sensing of glucose in diagnosing diabetes or provide a catalyst to capture the sun's energy and turn it into clean fuel.

Their work, they further believe, greatly contributes to understanding how hybrid nanoparticles form. Hybrid nanoparticles are systems which combine two or more different materials on the same particle in which the combination provides multi-functionality to the particle. The discovery of the Hebrew University scientists is described in an article published now online and in the October 2010 issue of the journal Nature Materials.

The new Star of David shaped particles, with sizes 10,000 times smaller than the width of a human hair, were discovered by the research group of Uri Banin, the Alfred and Erica Larisch Memorial Professor and the director of the Harvey M. Kruger Family Center for Nanoscience and Nanotechnology at the Hebrew University.

The researchers have been working to try and develop new nanoparticles made of two kinds of materials joined together. So far, scientists have only been aware of nanoparticles in which one material encapsulates the other (resembling an egg and a yolk), or where an island of one material forms on the other (much like the head of the match on a match-stick). This was not the case with the Star of David shapes.

Dr. Janet Macdonald, a postdoctoral fellow in Banin's group, worked on synthesizing nanoparticles combining copper sulfide, a common mineral with semiconducting properties, and ruthenium, a metal with exceptional chemical-catalytic properties. Instead of the expected ruthenium islands on the seed particles, what she saw in the pictures from the electron microscope were particles with surprising striped patterns and Star of David shapes.

What followed was the difficult task of figuring out the three-dimensional shape of the particles that could give such images. The mystery took months to solve and confirm by careful analysis and with the aid of Dr. Maya Bar Sadan and Dr. Lothar Houben of the Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons in Juelich, Germany.

The researchers generated a three-dimensional image of the tiny nanoparticles using a powerful electron microscope and found that the Stars of David are, remarkably, "nano-cages." The particles are nano-sized, hexagonal crystals, each with a tiny metal frame wrapping around and encasing them just like a bird's cage, but 100 million times smaller. Because the nano-cage is hexagonal, when looking at pictures of them from above, they appear as Stars of David. No one had ever seen hybrid nanoparticles form with such a cage structure before.

Exploration into the possible applications for the nano Stars of David has just begun, and already they have shown that they are not just beautiful; the composition and the unique cage shape makes them useful. The first application demonstrated was in the use of the nano-cages as sensors. The researchers coated an electrode with the Star of David nano-cages and proved that it is possible to detect with the new device minute quantities of hydrogen peroxide. Uncaged copper sulfide particles alone were not sensitive, and remarkably, the addition of the metal frame boosted the electrical signal of detection 200 fold. Sensing peroxide is a first step towards new and better sensors for glucose, which has important medical implications, including for diabetes diagnostics.

But Banin and his researchers have wider aspirations for the nano Stars of David: testing these materials as sensors for other medical and environmental applications, and exploring if they can be used as photocatalysts for using sunlight to make "green fuel."

####

For more information, please click here

Copyright © Hebrew University of Jerusalem

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 Links

Harvey M. Kruger Family Center for Nanoscience and Nanotechnology

Related News Press

News and information

Bringing the atomic world into full color: Researchers turn atomic force microscope measurements into color images October 19th, 2017

'Find the Lady' in the quantum world: International team of researchers presents method for quantum-mechanical swapping of positions October 18th, 2017

Long nanotubes make strong fibers: Rice University researchers advance characterization, purification of nanotube wires and films October 17th, 2017

Spinning strands hint at folding dynamics: Rice University lab uses magnetic beads to model microscopic proteins, polymers October 17th, 2017

Possible Futures

Bringing the atomic world into full color: Researchers turn atomic force microscope measurements into color images October 19th, 2017

'Find the Lady' in the quantum world: International team of researchers presents method for quantum-mechanical swapping of positions October 18th, 2017

Long nanotubes make strong fibers: Rice University researchers advance characterization, purification of nanotube wires and films October 17th, 2017

Spinning strands hint at folding dynamics: Rice University lab uses magnetic beads to model microscopic proteins, polymers October 17th, 2017

Academic/Education

Two Scientists Receive Grants to Develop New Materials: Chad Mirkin and Monica Olvera de la Cruz recognized by Sherman Fairchild Foundation August 16th, 2017

Moving at the Speed of Light: University of Arizona selected for high-impact, industrial demonstration of new integrated photonic cryogenic datalink for focal plane arrays: Program is major milestone for AIM Photonics August 10th, 2017

Graduate Students from Across the Country Attend Hands-on NanoCamp: Prominent scientists Warren Oliver, Ph.D., and George Pharr, Ph.D., presented a weeklong NanoCamp for hand-picked graduate students across the United States July 26th, 2017

The Physics Department of Imperial College, London, uses the Quorum Q150T to deposit metals and ITO to make plasmonic sensors and electric contact pads July 13th, 2017

Nanomedicine

Spinning strands hint at folding dynamics: Rice University lab uses magnetic beads to model microscopic proteins, polymers October 17th, 2017

Arrowhead Pharmaceuticals to Present Preclinical Data on ARO-AAT at The Liver Meeting(R) October 10th, 2017

Arrowhead to Present at Chardan Gene Therapy Conference October 3rd, 2017

'CRISPR-Gold' fixes Duchenne muscular dystrophy mutation in mice October 3rd, 2017

Sensors

Rice U. study: Vibrating nanoparticles interact: Placing nanodisks in groups can change their vibrational frequencies October 16th, 2017

Single ‘solitons’ promising for optical technologies October 9th, 2017

Two dimensional materials: Advanced molybdenum selenide near infrared phototransistors September 27th, 2017

Enhancing the sensing capabilities of diamonds with quantum properties: A simple method can give diamonds the special properties needed for quantum applications such as sensing magnetic fields September 24th, 2017

Discoveries

Bringing the atomic world into full color: Researchers turn atomic force microscope measurements into color images October 19th, 2017

'Find the Lady' in the quantum world: International team of researchers presents method for quantum-mechanical swapping of positions October 18th, 2017

Long nanotubes make strong fibers: Rice University researchers advance characterization, purification of nanotube wires and films October 17th, 2017

Spinning strands hint at folding dynamics: Rice University lab uses magnetic beads to model microscopic proteins, polymers October 17th, 2017

Announcements

Bringing the atomic world into full color: Researchers turn atomic force microscope measurements into color images October 19th, 2017

Long nanotubes make strong fibers: Rice University researchers advance characterization, purification of nanotube wires and films October 17th, 2017

Spinning strands hint at folding dynamics: Rice University lab uses magnetic beads to model microscopic proteins, polymers October 17th, 2017

Rice U. study: Vibrating nanoparticles interact: Placing nanodisks in groups can change their vibrational frequencies October 16th, 2017

Energy

New nanomaterial can extract hydrogen fuel from seawater: Hybrid material converts more sunlight and can weather seawater's harsh conditions October 4th, 2017

Researchers set time limit for ultrafast perovskite solar cells September 22nd, 2017

Copper catalyst yields high efficiency CO2-to-fuels conversion: Berkeley Lab scientists discover critical role of nanoparticle transformation September 20th, 2017

Solar-to-fuel system recycles CO2 to make ethanol and ethylene: Berkeley Lab advance is first demonstration of efficient, light-powered production of fuel via artificial photosynthesis September 19th, 2017

Nanobiotechnology

Spinning strands hint at folding dynamics: Rice University lab uses magnetic beads to model microscopic proteins, polymers October 17th, 2017

Arrowhead Pharmaceuticals to Present Preclinical Data on ARO-AAT at The Liver Meeting(R) October 10th, 2017

Arrowhead to Present at Chardan Gene Therapy Conference October 3rd, 2017

'CRISPR-Gold' fixes Duchenne muscular dystrophy mutation in mice October 3rd, 2017

Solar/Photovoltaic

New nanomaterial can extract hydrogen fuel from seawater: Hybrid material converts more sunlight and can weather seawater's harsh conditions October 4th, 2017

Researchers set time limit for ultrafast perovskite solar cells September 22nd, 2017

Copper catalyst yields high efficiency CO2-to-fuels conversion: Berkeley Lab scientists discover critical role of nanoparticle transformation September 20th, 2017

Solar-to-fuel system recycles CO2 to make ethanol and ethylene: Berkeley Lab advance is first demonstration of efficient, light-powered production of fuel via artificial photosynthesis September 19th, 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