Navigation Links
Method sorts out double-walled carbon nanotube problem

ce and engineering in Northwestern's McCormick School of Engineering and Applied Science, professor of chemistry in the Weinberg College of Arts and Sciences and the paper's senior author.

"This size dependence implies, however, that the physical dimensions must be exquisitely controlled in order to realize uniform and reproducible performance in devices. Our study directly addresses this issue for double-walled carbon nanotubes, an emerging nanomaterial with applications in information technology, biotechnology and alternative energy," said Hersam.

He collaborated with Alexander A. Green, a graduate student in materials science and engineering at Northwestern and lead author of the paper, titled "Processing and Properties of Highly Enriched Double-Walled Carbon Nanotubes."

Using the Northwestern method, carbon nanotubes first are encapsulated in water by soap-like molecules called surfactants. The surfactant-coated nanotubes then are sorted in density gradients that are spun at tens of thousands of rotations per minute in an ultracentrifuge. Each nanotube's diameter and electronic structure help determine the nanotube's buoyant density, which enables the method to separate DWNTs from the SWNTs and MWNTs.

The double-walled nanotubes, the researchers discovered, were approximately 44 percent longer than the single-walled nanotubes. This longer length of the DWNTs results in a factor of 2.4 improvement in the electrical conductivity of transparent conductors.

Double-walled nanotubes also enable improved spatial resolution and longer scanning lifetimes as tips for atomic force microscopes and are useful in field-effect transistors, biosensing and drug delivery.


Contact: Megan Fellman
Northwestern University

Page: 1 2

Related biology technology :

1. Stem Cell Sciences Signs Service Agreement With Pfizer to Provide Access to Proprietary Technologies and Methods
2. Researchers discover method for mass production of nanomaterial graphene
3. Stretching silicon: A new method to measure how strain affects semiconductors
4. Waters Publishes Rapid and Specific Method of Detection for Melamine in Infant Formula and Liquid Milk, in Support of Chinas Ministry of Science and Technology
5. SpectraScience Awarded Patent for Its Optical Biopsy System and Methods for Tissue Diagnosis
6. UC Riverside researcher develops novel method to grow human embryonic stem cells
7. PerkinElmer Expertise and Solutions Integral to Food Safety Monitoring for the Beijing Games : Methods, Applications Expertise and Instrumentation Deployed in Mobile Laboratory
8. Lumidigm Signs Strategic Agreement with Methode Electronics : Automotive Supplier Invests in Biometric Component Development
9. Enhanced Protein Tomography(TM) Method for Rapid Epitope Determination
10. Bionovo Develops a High Throughput LC-MS/MS Method for Simultaneous Quantification of Multiple Bioactive Compounds
11. febit Receives U.S. Patent for Microfluidic Extraction Method
Post Your Comments:
(Date:12/15/2014)... , Dec. 15, 2014  Origin Agritech Limited (NASDAQ ... a technology-focused supplier of crop seeds in China ... for its fiscal year 2014 ended September 30, 2014, before ... The Company will host a teleconference on January 8, 2015, ... time to discuss the results. To participate in ...
(Date:12/13/2014)... Clarassance, a privately held clinical-stage biotechnology company based ... Therapeutics , Inc. The new name is derived from ... in the lungs similar to branches on a tree), ... therapeutics for the treatment of respiratory diseases. , ... to mark the company's escalation into the clinical phase ...
(Date:12/13/2014)... 13, 2014 According to population studies: ... between now and 2030." If a population explosion like ... most populous state in the country. , To that ... the Future of North Carolina Forum on December 16th ... have the necessary infrastructure in place? Enough clean water? ...
(Date:12/13/2014)... , Dec. 12, 2014  Vaccinex ... the discovery and development of therapeutic monoclonal ... today announced publication of a manuscript entitled ... inhibits remyelination in neurodegenerative disease" in the ... of Disease*.  The publication highlights an important ...
Breaking Biology Technology:Origin Agritech Limited to Announce Fiscal 2014 Annual Financial Results on January 8th, 2015 2Origin Agritech Limited to Announce Fiscal 2014 Annual Financial Results on January 8th, 2015 3Maryland-based Biotech Company's Path Forward in Treating Respiratory Diseases Sparks Name Change 2North Carolina Chamber of Commerce: Asking Questions & Gathering Answers with a Futurist 2Vaccinex announces publication of preclinical studies with an anti-SEMA4D antibody in animal models of neuroinflammatory and demyelinating disease 2
... ... NEW YORK, Nov. 16 Sharon L. Allen, Chairman of the,Board, ... of,the American Friends of the Phelophepa Train (AFPT). "It,s an honor, ... Archbishop Desmond Tutu and Ms. Leah Tutu in bringing,awareness to the healthcare ...
... led in the discovery of genes that confer risk of, ... ... AM EST, REYKJAVIK, Iceland, Nov. 16 deCODE genetics,(Nasdaq: DCGN ... to get a detailed look at their own,genome. Through your subscription ...
... This release is available in German . ... but simple methods for the production of tiny particles ... special regular patterns in two or three dimensions and ... objects have countless applications in modern technology, from diagnostic ...
Cached Biology Technology:Deloitte Chairman of the Board Sharon L. Allen Named Chairman of the American Friends of the Phelophepa Train 2deCODE Launches deCODEme(TM) 2deCODE Launches deCODEme(TM) 3deCODE Launches deCODEme(TM) 4Two-faced miniatures 2
(Date:12/5/2014)... 4, 2014  Tute Genomics, a leader in cloud-based ... Series A1 funding led by UK-based Eurovestech. Peak Ventures ... the investment round. "We are at a ... next-generation sequencing and seeks new approaches for the diagnosis, ... , MD MBA, and CEO of Tute Genomics. "One ...
(Date:11/21/2014)... According to a new market research report ... Control, Intrusion Detection, Parking Management, Under Vehicle Inspection), End ... - Global Forecasts to 2020", published by MarketsandMarkets, The ... $25 Billion in 2014 and is expected to reach ... 8.69%. Browse 116 market data Tables and ...
(Date:11/21/2014)... , Nov. 20, 2014   Atmel® Corporation ... in microcontroller (MCU) and touch technology solutions, today launched ... sensors with the widest V cc range ... temperature accuracy and faster I 2 C bus communication ... serial EEPROM memory making them ideal for consumer, industrial, ...
Breaking Biology News(10 mins):Tute Genomics Raises $2.3 Million to Scale Up Cloud-Based Genome Analytics and Accelerate Personalized Medicine 2Tute Genomics Raises $2.3 Million to Scale Up Cloud-Based Genome Analytics and Accelerate Personalized Medicine 3Industrial Security Systems Market Worth $38 Billion by 2020 2Industrial Security Systems Market Worth $38 Billion by 2020 3Atmel Launches Industry's First Wide-V(cc) Low-Power Temperature Sensor Family 2Atmel Launches Industry's First Wide-V(cc) Low-Power Temperature Sensor Family 3Atmel Launches Industry's First Wide-V(cc) Low-Power Temperature Sensor Family 4
... . . People with tomorrow,s prosthetic ... cold and touch through a series of developments by ... different ORNL research groups, Ilia Ivanov and Dave Geohegan ... John Simpson of the superhydrophobic materials group, are combining ...
... -- If projected increases in the use of corn ... could be considerable, and water supply problems at the ... new report from the National Research Council. The ... identified opportunities for new agricultural techniques and technologies to ...
... found in the environment may be interacting with the ... easier because of a new field of science called ... National Academies of Sciences (NAS) recognizes the importance of ... the integration of toxicogenomics into regulatory decision making. ...
Cached Biology News:Story tips from the Department of Energy's Oak Ridge National Laboratory, October 2007 2Increase in ethanol production from corn could significantly impact 2Increase in ethanol production from corn could significantly impact 3NAS report offers new tools to assess health risks from chemicals 2