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:7/31/2015)... , July 31, 2015 The 10 th ... be held by BGI from October 22-25, 2015, in ... The conference is celebrating its 10 th anniversary this ... of the world,s most influential annual meetings in the ,omics, ... enjoyable scientific gatherings. ICG-10 focuses on recent ...
(Date:7/23/2015)... Research and Markets ( http://www.researchandmarkets.com/research/rzzp3v/global_outlook_of ) ... Outlook of the Biometrics Industry 2015 " ... global biometrics market is likely to witness significant ... to the uptake of multiple technologies available. The ... the growth of biometrics in existing applications as ...
(Date:7/13/2015)... , July 13, 2015 Synaptics ... of human interface solutions, today announced sampling of ... and display driver integration (TDDI) product targeting smartphones ... first to combine Synaptics , best-in-class touch ... display driver technology developed in the company,s Japan ...
Breaking Biology News(10 mins):The 10th International Conference on Genomics (ICG-10) to Open in October 2Global Outlook of the Biometrics Industry 2015 2Global Outlook of the Biometrics Industry 2015 3Synaptics Announces Sampling of Second Generation TDDI Solutions 2Synaptics Announces Sampling of Second Generation TDDI Solutions 3
... volume of online scientific data, a new style of ... have a direct impact on scientists and clinicians. ... Biology and Faculty of 1000 Medicine, are each launching ... journals, called F1000 Reports, are unlike existing scientific journals ...
... wide-open spaces of the Flint Hills may no longer ... familiar grassland birds, according to research by a Kansas ... found that three bird species common to the Flint ... population decline in the face of extensive land-management practices ...
... epidemiological study of men and post-menopausal women primarily over ... associated with greater bone mineral density (BMD). Researchers at ... Aging (USDA HNRCA) at Tufts University found associations were ... significantly lower in men drinking more than two servings ...
Cached Biology News:World's experts identify the hottest trends in biology and medicine 2Birds in Flint Hills of Kansas, Oklahoma face population decline despite large habitat 2Birds in Flint Hills of Kansas, Oklahoma face population decline despite large habitat 3Moderate alcohol intake associated with bone protection 2Moderate alcohol intake associated with bone protection 3
(Date:8/3/2015)...  Halozyme Therapeutics, Inc. (NASDAQ: HALO ) will ... quarter 2015 on Monday, August 10, 2015 at 4:30 ... president and chief executive officer, will lead the call. ... results for the second quarter 2015. The ... of Halozyme,s corporate website and a recording will be ...
(Date:8/3/2015)... 2015  ArroGen Group, an integrated advanced forensic ... Identification™ (FMID) technology Aug. 2-8 at the International ... Sacramento, Calif. FMID, a ... enforcement agents, district attorneys and government agencies to ... By analyzing chemical residues on fingerprints taken ...
(Date:8/3/2015)... At the 11th hour, London,s ... of Jude Liversage,s campaign so the seven-year-old ...      (Photo: http://photos.prnewswire.com/prnh/20150803/254228 ) ... The Selective Dorsal Rhizotomy (SDR) procedure reduced the spasticity ... wish to kick a ball around like his schoolmates. ...
(Date:8/3/2015)... Ga. , Aug. 3, 2015  MiMedx Group, ... company utilizing human amniotic tissue and patent-protected processes to ... Wound Care, Surgical, Orthopedic, Spine, Sports Medicine, Ophthalmic and ... present at the 35 th Annual Canaccord|Genuity Growth ... H. "Pete" Petit, Chairman and CEO, William C. ...
Breaking Biology Technology:Halozyme to Host Second Quarter 2015 Financial Results Conference Call 2ArroGen Previews New Fingerprint Molecular Identification Technology 2Cerebral Palsy Operation by The Portland Hospital Allows a Boy to Stand Properly for the First Time 2Cerebral Palsy Operation by The Portland Hospital Allows a Boy to Stand Properly for the First Time 3MiMedx To Present At 35th Annual Canaccord|Genuity Growth Conference 2
... /PRNewswire-FirstCall/ - YM BioSciences Inc. (NYSE Amex: YMI, ... York), a licensee of several small molecule compounds ... of Health (NIH) Small Business Innovation Research (SBIR) ... Phase I awards to develop novel treatments for ...
... a bad rap for contributing to hypertension and cardiovascular disease. ... Sciences have discovered that sodium also plays a key role ... Tufts scientists have found a way to regenerate injured spinal ... an influx of sodium ions into injured cells. ...
... and global contributions to clean water and environmental causes, ... to invention and the pursuit of discovery, Professor Xiaoguang ... Stevens Institute of Technology at the university,s annual Convocation ... professor in the Charles V. Schaefer, Jr. School of ...
Cached Biology Technology:YM BioSciences licensee Pulmokine awarded NIH funding to develop small molecule drugs for pulmonary hypertension 2YM BioSciences licensee Pulmokine awarded NIH funding to develop small molecule drugs for pulmonary hypertension 3Sodium plays key role in tissue regeneration 2Sodium plays key role in tissue regeneration 3Xiaoguang Meng receives honorary master of engineering from Stevens 2Xiaoguang Meng receives honorary master of engineering from Stevens 3
... polymerase from Thermus aquaticus expressed in E. ... tube of 250 units enzyme/tube and Buffer ... is the same enzyme as AmpliTaq DNA ... proprietary separation process to ensure that contaminating ...
Our original highly-purified, robust Taq Polymerase which delivers consistently high yields and minimal background...
Taq DNA polymerase, 10,000U...
... AmpliTaq DNA Polymerase is the ... PCR process, a testimony to its overall ... profile makes it ideal for PCR applications. ... guarantee reproducible results. ,, AmpliTaq DNA ...
Biology Products: