Navigation Links
Carbon nanotube measurements: latest in NIST 'how-to' series
Date:4/15/2008

The National Institute of Standards and Technology (NIST), in collaboration with the National Aeronautics and Space Administration (NASA), has published detailed guidelines* for making essential measurements on samples of single-walled carbon nanotubes (SWCNTs). The new guide constitutes the current best practices for characterizing one of the most promising and heavily studied of the new generation of nanoscale materials.

The nanotubes are essentially cylinders of carbon atoms with a wall only one atom thick and a diameter of a couple of nanometersbut lengths up to several million times their diameter. (Think of a soup can about 100 kilometers tall.) Because of their unique electronic, thermal, optical and mechanical properties they are being studied for a wideand expandingrange of applications, including ultrastrong fibers for nanocomposite materials, circuit elements in molecular electronics, hydrogen storage components for fuel cells and light sources for compact, efficient flat-panel displays. One basic problem is assuring the quality and purity of SWCNT materials. All known techniques for producing these tiny tubes also produce large quantities of nanojunk: simple graphite and carbon soot often encapsulating small metal particles used to catalyze the nanotube synthesis process. (See, for example, NIST Laser-Based Method Cleans Up Grubby Nanotubes, Tech Beat Dec. 1, 2006.)

Accurate, reliable and preferably rapid measurement techniques are needed to optimize production processes to create more product and less impurities. These will help to control cleaning and purifying processes and ultimately to improve the confidence of buyers and sellers of SWCNT materials. Beginning in 2003, NIST and NASA researchers started addressing the problem by sponsoring a series of workshops devoted to nanotube measurements. The NIST Recommended Practice Guide on Measurement Issues in Single Wall Carbon Nanotubes grew out of second workshop in 2005, and represents what industry, government and academic researchers regard as the most useful and accurate measurement techniques for characterizing the purity of SWCNT samples. The techniques discussed include thermogravimetric analysis; near-infrared spectroscopy; Raman spectroscopy and optical, electron and scanned probe microscopy. Researchers from the NASA Johnson Space Center, the University of California at Riverside, Boston University and the NASA Langley Research Center contributed to the guide.

The techniques described in the guide were proposed as the basis for international standards for nanotube characterization. A collaborative effort that includes the US, China, Japan, and Korea is now underway under the International Organization for Standardization (ISO) to develop these techniques into standards that will help ensure uniform characterization metrics used when buying and selling nanotubes. The editors caution that in the fast-moving field of carbon nanotubes, characterization methods will need to be updated periodically.

The NIST Recommend Practice Guides are a set of publications devoted to specific, challenging measurement issues faced in industry and research. Online copies of Measurement Issues in Single Wall Carbon Nanotubes and other guides in the series are available at The How To Measure Book Series.


'/>"/>

Contact: Michael Baum
michael.baum@nist.gov
301-975-2763
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

Related biology technology :

1. Carbon nanotubes made into conductive, flexible stained glass
2. The future of computing -- carbon nanotubes and superconductors to replace the silicon chip
3. Carbon nanotubes outperform copper nanowires as interconnects
4. Mission critical for carbon management
5. National Association of Emergency Medical Technicians (NAEMT) Supports Prehospital Screening for Carbon Monoxide in the Blood
6. Carbon offset warning from international team of scientists
7. International Association of Fire Fighters (IAFF) Advocates Screening Fire Fighters for Carbon Monoxide Poisoning Using Pulse CO-Oximetry
8. ADM, MGSC and ISGS Announce Carbon Sequestration Project
9. Move over, silicon: Advances pave way for powerful carbon-based electronics
10. Clemson researcher studies carbon fibers for nuclear reactor safety
11. FED-TVs with carbon nanotube technology could supersede plasma and LCD flat screens
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Carbon nanotube measurements: latest in NIST 'how-to' series
(Date:2/11/2016)... ... February 11, 2016 , ... Reichert Technologies, which has ... to pursue the highest level of accuracy and quality with the addition of ... the AR5 Refractometer. Accurate, reliable and tough enough for the most demanding ...
(Date:2/11/2016)... ... , ... Global Stem Cells Group, has announced ... new facility will provide advanced protocols and state-of-the-art techniques in cellular medicine, focusing ... The new GSCG clinic is headed by four prominent Ecuadorian physicians, including Pablo ...
(Date:2/10/2016)... -- Early-career researchers from Indonesia ... Uganda and Yemen ...   Indonesia , Nepal , ... Yemen are being honored for their accomplishments in nutrition, ... for mentoring young women scientists who are pursuing careers in agriculture, biology ...
(Date:2/10/2016)... , Feb. 10, 2016 NX Prenatal ... its proprietary NeXosome® technology for early warning of ... its most recent study by Dr. Thomas ... the Society for Maternal Fetal Medicine,s (SMFM) annual meeting ... 1-6 th , 2016.  The presentation reported initial ...
Breaking Biology Technology:
(Date:2/1/2016)... Feb. 1, 2016  Today, the first day of ... plans to develop a first of its kind workplace ... IBM Watson. In the first application of ... IBM ), and Welltok will create a new ... with cognitive analytics, delivered on Welltok,s health optimization platform. ...
(Date:1/27/2016)... 2016  Rite Track, Inc. a leading semiconductor equipment ... Chester, Ohio announced today the acquisition of PLUS ... in Austin, Texas , will significantly ... modifications, installations and technical support offerings for TEL Track ... commented, "PLUS has provided world class service including refurbishment, ...
(Date:1/22/2016)... 22, 2016 ... of the  "Global Behavioral Biometric Market ... --> http://www.researchandmarkets.com/research/4lmf2s/global_behavioral ) has announced ... Biometric Market 2016-2020"  report to their ... Markets ( http://www.researchandmarkets.com/research/4lmf2s/global_behavioral ) has announced the ...
Breaking Biology News(10 mins):