Navigation Links
Shape matters in the case of cobalt nanoparticles
Date:6/17/2009

Shape is turning out to be a particularly important feature of some commercially important nanoparticlesbut in subtle ways. New studies* by scientists at the National Institute for Standards and Technology (NIST) show that changing the shape of cobalt nanoparticles from spherical to cubic can fundamentally change their behavior.

Building on a previous paper** that examined the properties of cobalt formed into spheres just a few nanometers in diameter, the new work explores what happens when the cobalt is synthesized instead as nanocubes. Nanoparticles of cobalt possess large magnetic momentsa measure of magnetic strengthand unique catalytic properties, and have potential applications in information storage, energy and medicine.

One striking difference is the behavior of the two different particle types when external magnetic fields are applied and then removed. In the absence of a magnetic field, both the spherical and cubic nanoparticles spontaneously form chainslining up as a string of microscopic magnets. Then, when placed in an external magnetic field, the individual chains bundle together in parallel lines to form thick columns aligned with the field. These induced columns, says NIST physicist Angela Hight Walker, imply that the external magnetic fields have a strong impact on the magnetic behavior of both nanoparticle shapes.

But their group interactions are somewhat different. As the strength of the external field is gradually reduced to zero, the magnetization of the spherical nanoparticles in the columns also decreases gradually. On the other hand, the magnetization of the cubic particles in the columns decreases in a much slower fashion until the particles rearrange their magnetic moments from linear chains into small circular groups, resulting in a sudden drop in their magnetization.

The team also showed that the cubes can be altered merely by observing with one of nanotechnologys microscopes of choice. After a
'/>"/>

Contact: Chad Boutin
boutin@nist.gov
301-975-4261
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

Page: 1 2

Related biology news :

1. Facial attraction -- choice of sexual partner shaped the human face
2. Shape encoding may start in the retina
3. Grant supports study of abnormal ring-shaped chromosomes
4. Secure Services Corp. Achieves Milestone in United States Identity Protection with the Launch of the SSC SHAPE Card Management Solution
5. How cells keep in shape
6. New process makes nanofibers in complex shapes and unlimited lengths
7. Particle accelerator may reveal shape of alternate dimensions
8. Crop scientists discover gene that controls fruit shape
9. Ozone hole recovery may reshape southern hemisphere climate change
10. Study links low-frequency hearing to shape of the cochlea
11. Courtship pattern shaped by emergence of a new gene in fruit flies
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Shape matters in the case of cobalt nanoparticles
(Date:7/24/2014)... brewery has its own microbial terroir, meaning the microbial ... found in the product, creating the final flavor according ... Applied and Environmental Microbiology . This is the ... a sake brewery. , Many sake makers inoculate ... A. Mills of the University of California, Davis, but ...
(Date:7/24/2014)... Einstein College of Medicine of Yeshiva University have ... for Parkinson,s Research to translate a basic science finding ... project will test chemical compounds on a newly identified ... acts on an underlying cause of the disease. ... manage their symptoms, we are eager to stop or ...
(Date:7/24/2014)... affect the connections between nerve cells and influence the ... of the brain that plays a significant role in ... of the study have been published in the journal ... active communication between nerve cells, known as neurons. For ... network where they constantly relay signals to one another. ...
Breaking Biology News(10 mins):The microbes make the sake brewery 2Albert Einstein College of Medicine receives grant from the Michael J. Fox Foundation to fund drug discovery project targeting Parkinson's 2Albert Einstein College of Medicine receives grant from the Michael J. Fox Foundation to fund drug discovery project targeting Parkinson's 3A protein couple controls flow of information into the brain's memory center 2A protein couple controls flow of information into the brain's memory center 3A protein couple controls flow of information into the brain's memory center 4
... scientists from the University of Leicester has published research which ... babies are being exposed to. Research published today ... Edition of Archives of Disease in Childhood documents ... premature infants as part of their medical care. The ...
... technological centre specialising in marine and food research, ... Third country eXpertise) project. The fundamental aim of ... possible on scientific fishery research programs from the ... to achieve effective coordination and cooperation between countries, ...
... suggests that human male fertility is impacted by long-term ... present in the male reproductive tract, further suggesting a ... genetic test to clarify mechanisms. Now, in a paper ... characterize the phenotype of mice genetically lacking FAAH, fatty ...
Cached Biology News:Research exposes the risk to infants from the chemicals used in liquid medicines 2Research exposes the risk to infants from the chemicals used in liquid medicines 3TXOTX, coordinated international project to contribute to sustainability of the marine resources 2February 2009 highlights from Biology of Reproduction 2
(Date:7/24/2014)... 24, 2014 1000 balances – 4 ... on customers’ weighing needs and expertly narrows down the ... balances, scales or even terminals. , First, select ... weight (or select readability instead) and define the accuracy ... selection criteria narrows down the list to models that ...
(Date:7/24/2014)... Draper University, a top program ... announce that for 6 weeks this summer, 39 ... on the Draper University campus in the heart ... focused on entrepreneurship, building real-world skills, and “learning ... its sixth cohort, continues to refresh its curriculum ...
(Date:7/24/2014)... July 24, 2014   Cypher Genomics, Inc., ... appointment of Adam Simpson as president ... rapid and comprehensive annotation and interpretation of individual ... "Cypher,s technology has the potential to ... enhancing diagnostic accuracy, optimizing therapeutic approaches and reducing ...
(Date:7/24/2014)... San Diego, CA (PRWEB) July 24, 2014 ... in the reporting of molecular diagnostic test results. ... tracking capabilities necessary for the validation and reporting ... in oncology. Molecular diagnostics is a rapidly growing ... for infectious disease, genetic predisposition, cancer, and companion ...
Breaking Biology Technology:Summer Entrepreneurship Program Kicked Off by Draper University in Silicon Valley 2Summer Entrepreneurship Program Kicked Off by Draper University in Silicon Valley 3Cypher Genomics Announces the Appointment of Adam Simpson as President and COO to Advance Transformative Genome Interpretation Technology 2Cypher Genomics Announces the Appointment of Adam Simpson as President and COO to Advance Transformative Genome Interpretation Technology 3New DNA-barcode Patent Virtually Eliminates False Test Results and Sample Mix-up 2
... - Non-GAAP and GAAP Operating Earnings ... Diluted EPS Up 15%, GAAP Diluted EPS Up 16%, PALO ALTO, ... revenues of $237.4,million, representing an increase of 8.9% over revenues of $217.9 ... growth in sales of products for both life science and industrial,(which includes ...
... Jan. 23 PPD, Inc. (Nasdaq:,PPDI) today announced ... services,into China through an exclusive agreement with Peking ... PPD to begin,immediately providing biopharmaceutical clients with its ... China., "Chinese law makes it extremely difficult ...
... - Increases medical waste disposal capacity and capabilities to facilitate ... growth plans - New state-of-the-art autoclave technology provides environmentally ... operation, - With the addition of the autoclave, one of approximately ten permitted,commercial disposal facilities in the country ... of medical waste ...
Cached Biology Technology:Varian, Inc. Reports First Quarter 2008 Results 2Varian, Inc. Reports First Quarter 2008 Results 3Varian, Inc. Reports First Quarter 2008 Results 4Varian, Inc. Reports First Quarter 2008 Results 5Varian, Inc. Reports First Quarter 2008 Results 6Varian, Inc. Reports First Quarter 2008 Results 7Varian, Inc. Reports First Quarter 2008 Results 8Varian, Inc. Reports First Quarter 2008 Results 9Varian, Inc. Reports First Quarter 2008 Results 10Varian, Inc. Reports First Quarter 2008 Results 11Varian, Inc. Reports First Quarter 2008 Results 12Varian, Inc. Reports First Quarter 2008 Results 13Varian, Inc. Reports First Quarter 2008 Results 14Varian, Inc. Reports First Quarter 2008 Results 15Varian, Inc. Reports First Quarter 2008 Results 16Varian, Inc. Reports First Quarter 2008 Results 17Varian, Inc. Reports First Quarter 2008 Results 18PPD Expands Global Central Lab Services into China 2PPD Expands Global Central Lab Services into China 3Sharps Compliance Corp. Announces Purchase of Medical Waste Disposal Facility and Addition of Autoclave Technology 2Sharps Compliance Corp. Announces Purchase of Medical Waste Disposal Facility and Addition of Autoclave Technology 3Sharps Compliance Corp. Announces Purchase of Medical Waste Disposal Facility and Addition of Autoclave Technology 4
Curcumin is an extract of turmeric root with antioxidant, anti-tumor promoter, and anti-inflammatory properties. Curcumin inhibits the induction of NOS in macrophages....
UGT1A6 (D-20)...
... smallest electronic pressure controller available measuring 26 ... this unit specifically for the analytical instrumentation ... carrier gas flow control, microfluidic flow control, ... focusing, the OEM-EPC offers external pressure sensor ...
... The P5T Series Short Stroke Thrust ... stroke applications where mounting envelopes are limited ... wear bands and internal bumpers provide millions ... applications., Choice of composite bushings or ...
Biology Products: