Navigation Links
No small measure: Origins of nanorod diameter discovered
Date:3/19/2009

Troy, N.Y. A new study answers a key question at the very heart of nanotechnology: Why are nanorods so small?

Researchers at Rensselaer Polytechnic Institute have discovered the origins of nanorod diameter, demonstrating that the competition and collaboration among various mechanisms of atomic transport hold the key to nanorod size. The researchers say it is the first study to identify the fundamental reasons why nearly all nanorods have a diameter on the order of 100 nanometers.

"Scientists have been fabricating nanorods for decades, but no one has ever answered the question, 'Why is that possible?'" said Hanchen Huang, professor in Rensselaer's Department of Mechanical, Aerospace, and Nuclear Engineering, who led the study. "We have used computer modeling to identify, for the first time, the fundamental reasons behind nanorod diameter. With this new understanding, we should be able to better control nanorods, and therefore design better devices."

Results of the study, titled "A characteristic length scale of nanorods diameter during growth," were recently published in the journal Physical Review Letters.

When fabricating nanorods, atoms are released at an oblique angle onto a surface, and the atoms accumulate and grow into nanorods about 100 nanometers in diameter. A nanometer is one billionth of a meter in length.

The accumulating atoms form small layers. After being deposited onto a layer, it takes varying amounts of energy for atoms to travel or "step" downward to a lower layer, depending on the step height. In a previous study, Huang and colleagues calculated and identified these precise energy requirements. As a result, the researchers discovered the fundamental reason nanorods grow tall: as atoms are unable to step down to the next lowest layer, they begin to stack up and grow higher.

It is the cooperation and competition of atoms in this process of multi-layer diffusion that accounts for the fundamental diameter of nanorods, Huang shows in the new study. The rate at which atoms are being deposited onto the surface, as well as the temperature of the surface, also factor into the equation.

"Surface steps are effective in slowing down the mass transport of surface atoms, and aggregated surface steps are even more effective," Huang said. "This extra effectiveness makes the diameter of nanorods around 100 nanometers; without it the diameter would go up to 10 microns."

Beyond advancing scientific theory, Huang said the discovery could have implications for developing photonic materials and fuel cell catalysts.


'/>"/>

Contact: Michael Mullaney
mullam@rpi.edu
518-276-6161
Rensselaer Polytechnic Institute
Source:Eurekalert

Related biology technology :

1. Imagenetix Inc. to Present at Noble Small Cap Financial Conference on August 21, 2007
2. FDA Approves ACAM2000(TM) Vaccine for Protection Against Smallpox
3. Exelixis Reports Encouraging Interim Data From a Phase 2 Trial of XL647 as First-Line Therapy for Non-Small Cell Lung Cancer
4. Stimuvax(R) Phase II data highlight three-year survival results for patients with non-small cell lung cancer
5. New technique producing small things in large quantities
6. Small Bone Innovations Introduces the Artelon(R) STT Spacer to Increase Treatment Options for Thumb Arthritis
7. Cell Therapeutics, Inc. (CTI) Receives SPA Approval from FDA and Launches Gender-Specific Phase III Trial for Advanced Non-Small Cell Lung Cancer
8. Small Bone Innovations Introduces New Distal Radius Plating System to Repair Complex Fractures
9. Cepheid to Present at William Blair Small-Cap Growth Stock Conference
10. Government Expands Trial With IMVAMUNE(R) Smallpox Vaccine in Persons With Atopic Dermatitis/Eczema
11. Poniard Pharmaceuticals Announces European Commission Grants Orphan Medicinal Product Designation to Picoplatin for Treatment of Small Cell Lung Cancer
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/22/2017)... ... August 22, 2017 , ... Cutting Edge ... of highly differentiated spinal implant technologies, announced today the appointment of Luke Maher ... spinal device industry experience to directing Cutting Edge Spine’s national sales force, including ...
(Date:8/22/2017)... ... 2017 , ... KBioBox is pleased to announce the creation ... ananlysis. KBioBox has adapted their core technology and direct alignment algorithms to extend ... understand reports, extended indel analysis, and translocation analysis. , “The extended GUIDE-Seq analysis ...
(Date:8/21/2017)... ... 2017 , ... MacArthur Sotheby’s International Realty, a luxury real ... the first Delos Wellness Signature™ residence in Hawaii is on the market for ... listing agent Kelly Allen, R(S) of Carvill Sotheby’s International Realty located on Oahu, ...
(Date:8/21/2017)... ... August 21, 2017 , ... Baltimore ... bio security firm, to bring its proprietary CANARY pathogen detection technology and high ... the Chinese firm has purchased an undisclosed number of PathSensors’ Zephyr pathogen detection ...
Breaking Biology Technology:
(Date:5/23/2017)... the first robotic gym for the rehabilitation and functional motor sense evaluation ... Genoa, Italy . The first 30 robots will be available from ... . The technology was developed and patented at the IIT laboratories ... Technology thanks to a 10 million euro investment from entrepreneur Sergio Dompè. ... ...
(Date:5/16/2017)... 16, 2017   Bridge Patient Portal , ... MD EMR Systems , an electronic medical ... GE, have established a partnership to build an ... the GE Centricity™ products, including Centricity Practice Solution ... These new integrations will allow healthcare delivery ...
(Date:4/24/2017)... 24, 2017 Janice Kephart , ... Identity Strategy Partners, LLP (IdSP) , today issues ... President Trump,s March 6, 2017 Executive Order: ... vetting can be instilled with greater confidence, enabling ... all refugee applications are suspended by until at ...
Breaking Biology News(10 mins):