RMIT University, Australia:The Formation of Nanofins from Magnetic Nanoparticles: Video


Printing Graphene ChipsPublished on Oct  2, 2013

Heat has become one of the most critical issues in computer and semiconductor design: The ever increasing number of transistors in computer chips requires more efficient cooling approaches for the hot spots which are generated as a result of the operation of the transistors. Researchers at RMIT University in Australia have demonstrated a microfluidic technique of using thermally conductive and magnetic chromium oxide nanoparticles that can form low-dimensional fins in the vicinity of hot spots.

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nanoparticle discovery could hail revolution in nanotube manufacturing


NANOSPHERES(Nanowerk News) A nanoparticle shaped like a spiky  ball, with magnetic properties, has been uncovered in a new method of  synthesising carbon nanotubes by physicists at Queen Mary University of London  and the University of Kent (“Boundary layer chemical vapor synthesis of  self-organized radial filled-carbon-nanotube structures”).

Sea Urchin nanoparticle

Sea Urchin Nanoparticle

Carbon nanotubes are  hollow, cylindrical molecules that can be manipulated to give them useful  properties. The nanoparticles were discovered accidentally on the rough surfaces  of a reactor designed to grow carbon nanotubes.

Described  as sea urchins because of their characteristic spiny appearance, the particles  consist of nanotubes filled with iron, with equal lengths pointing outwards in  all directions from a central particle.

The  presence of iron and the unusual nanoparticle shape could have potential for a  number of applications, such as batteries that can be charged from waste heat,  mixing with polymers to make permanent magnets, or as particles for cancer  therapies that use heat to kill cancerous cells.

The researchers  found that the rough surfaces of the reactor were covered in a thick powder of  the new nanoparticles and that intentional roughening of the surfaces produced  large quantities of the sea urchin nanoparticles.

“The surprising conclusion is that the sea urchin nanoparticles  grow in vapour by a mechanism that’s similar to snowflake formation. Just as  moist air flowing over a mountain range produces turbulence which results in a  snowfall, the rough surface disrupts a flow to produce a symmetrical and ordered  nanoparticle out of chaotic conditions,” said Dr Mark Baxendale from Queen  Mary’s School of Physics and Astronomy.
On analysis, the researchers found that a small fraction of the  iron inside the carbon nanotubes was a particular type usually only found in  high temperature and pressure conditions.
Dr Baxendale added: “We were surprised to see this rare kind of  iron inside the nanotubes. While we don’t know much about its behaviour, we can  see that the presence of this small fraction of iron greatly influences the  magnetic properties of the nanoparticle.”
Source: Queen Mary University of London

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Faster Computing, Smaller Memory Devices and Lower Power Consumption: Memory Breakthrough


Memory breakthrough could bring faster computing, smaller memory devices and  lower power consumption

how-nanotechnology-could-change-solar-panels-photovoltaic_66790_600x450(Nanowerk News) Memory devices like disk drives, flash  drives and RAM play an important role in our lives. They are an essential  component of our computers, phones, electronic appliances and cars. Yet current  memory devices have significant drawbacks: dynamic RAM memory has to be  refreshed periodically, static RAM data is lost when the power is off, flash  memory lacks speed, and all existing memory technologies are challenged when it  comes to miniaturization.
Increasingly, memory devices are a bottleneck limiting  performance. In order to achieve a substantial improvement in computation speed,  scientists are racing to develop smaller and denser memory devices that operate  with high speed and low power consumption.
Prof. Yossi Paltiel and research student Oren Ben-Dor at the  Hebrew University of Jerusalem’s Harvey M. Krueger Family Center for Nanoscience and  Nanotechnology, together with researchers from the Weizmann Institute of  Science, have developed a simple magnetization progress that, by eliminating the  need for permanent magnets in memory devices, opens the door to many  technological applications.
Published in Nature Communications, the research paper,  A chiral-based magnetic memory device without a  permanent magnet, was written by Prof. Yossi Paltiel, Oren Ben Dor and Shira  Yochelis at the Department of Applied Physics, Harvey M. Krueger Family Center  for Nanoscience and Nanotechnology, Hebrew University of Jerusalem; and Shinto  P. Mathew and Ron Naaman at the Department of Chemical Physics, Weizmann  Institute of Science.
The research deals with the flow properties of electron charge  carriers in memory devices. According to quantum mechanics, in addition to their  electrical charge, electrons also have a degree of internal freedom called spin,  which gives them their magnetic properties. The new technique, called magnetless  spin memory (MSM), drives a current through chiral material (a kind of  abundantly available organic molecule) and selectively transfers electrons to  magnetize nano magnetic layers or nano particles. With this technique, the  researchers showed it is possible to create a magnetic-based memory device that  does not require a permanent magnet, and which could allow for the  miniaturization of memory bits down to a single nanoparticle.
The potential benefits of magnetless spin memory are many. The  technology has the potential to overcome the limitations of other magnetic-based  memory technologies, and could make it possible to create inexpensive,  high-density universal memory-on-chip devices that require much less power than  existing technologies. Compatible with integrated circuit manufacturing  techniques, it could allow for inexpensive, high density universal  memory-on-chip production.
According to the Hebrew University’s Prof. Paltiel, “Now that  proof-of-concept devices have been designed and tested, magnetless spin memory  has the potential to become the basis of a whole new generation of faster,  smaller and less expensive memory technologies.”
The technology transfer companies of the Hebrew University  (Yissum) and the Weizmann Institute of Science (Yeda) are working to promote the  realization of this technology, by licensing its use and raising funds for  further development and commercialization. With many possible applications, it  has already attracted the attention of start-up funds.
The Hebrew University’s Center of Nanoscience and Nanotechnology  helped with device fabrication and advice. Prof. Paltiel acknowledges the  Yessumit internal grant from the Hebrew University, and Ron Naaman and Shinto P.  Mathew acknowledge the support of the Minerva Foundation.
Source: Hebrew University of Jerusalem

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