Navigation Links
Ions control shape of nanofibers grown on clear substrate
Date:8/16/2011

field in the chamber that excites the atoms in the acetylene and ammonia gas. Some of the electrons in these atoms break away, creating free electrons and positively charged atoms called ions. The free electrons accelerate around the chamber, knocking loose even more electrons. The positively charged ions are drawn to the negatively charged grid on the floor of the chamber.

Meanwhile, the nickel nanoparticles are serving as catalysts, reacting with the carbon in the acetylene gas (C2H2) to create graphitic carbon nanofibers. The catalyst rides on the tip of the nanofiber that forms beneath it, like a rapidly growing pillar. The term graphitic means that the nanofibers have carbon atoms arranged in a hexagonal structure like graphite.

One problem with growing carbon nanofibers is that the surface of the catalyst can become obstructed by a carbon film that blocks catalytic action, preventing further nanofibers growth. Here's where those ions come in.

The ions being drawn to the chromium grid are moving very quickly, and they choose the shortest possible route to reach the negatively-charged metal. In their rush to reach the grid, the ions often collide with the nickel catalysts, knocking off the excess carbon and allowing further nanofibers growth.

Because the ions are being drawn to the chromium grid, the angle at which they strike the catalysts depends on where the catalyst is located relative to the grid. For example, if you are looking down at the grid, a catalyst just to the right of the grid will appear to be leaning right because ions would have been striking the right side of the catalyst in an attempt to reach the grid. These nanofibers are still straight they don't curl up they simply lean in one direction. The bulk of the nanofibers, however, are both straight and vertically aligned.

"This finding gives us an opportunity to create new reactors for creating nanofibers, building in the chromium grid," Me
'/>"/>

Contact: Matt Shipman
matt_shipman@ncsu.edu
919-515-6386
North Carolina State University
Source:Eurekalert  

Page: 1 2 3

Related biology technology :

1. Light propagation controlled in photonic chips -- major breakthrough in telecommunications field
2. Researchers engineer the environment for stem cell development to control differentiation
3. Life Technologies Signs Exclusive License Agreement for TAL Effector Technology That Enables Synthetic Biologists to Precisely Control Gene Expression in Engineered Organisms
4. David H. Murdock Research Institute Assumes Control of the Immune Tolerance Institute and Establishes a State of the Art Human Immune Monitoring Laboratory for Biomarker Discovery and Development
5. UCLA researchers now 1 step closer to controlled engineering of nanocatalysts
6. Finesse Launches the VirtualTransmitter Module and TruFluor Transmitter Blades for Seamless Integration of Single-Use Sensors Into Bioreactor Control
7. Disease Control App for Doctors Wins Health 2.0 Data Challenge, Analyze This!
8. Berkeley Lab scientists control light scattering in graphene
9. Structured Diabetes Management can Significantly Improve Overall Glycemic Control and Reduce HbA1c Values in Non-insulin Treated Type 2 Diabetes
10. New research shows how light can control electrical properties of graphene
11. TU scientists in Nature: Better control of building blocks for quantum computer
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Ions control shape of nanofibers grown on clear substrate
(Date:7/24/2014)... MESA, Calif. , July 24, 2014  Now ... close to home. Rehealth Regenerative Therapies , located ... athletes and other physically active people a new health ... Regardless of age, countless patients suffer from ... sport activities, such as muscle tears, torn rotator cuff, ...
(Date:7/24/2014)... by group leader Yung-Eun Sung has announced that ... and nitrogen-doped graphenes which can be applied as ... cells. Yung-Eun Sung is both a group leader ... for Basic Science* (IBS) and a professor at ... great significance with regards to the development of ...
(Date:7/24/2014)... 24, 2014 Research and Markets ... Culture Market 2014-2018" report to their offering.  ... culture is the in vitro growth of plant or ... studies, and biopharmaceutical production. Cell culture is a crucial ... instruments and cell culture consumables are necessary for the ...
(Date:7/24/2014)... , July 24, 2014  CorMedix Inc. (NYSE ... and commercializing therapeutic products for the prevention and ... receipt of notice on July 18, 2014 from ... has accepted the CorMedix plan to regain compliance ... a result, the NYSE-MKT is continuing the Company,s ...
Breaking Biology Technology:Stem Cells In Sports Injuries, Joints And Muscular Pain 2Stem Cells In Sports Injuries, Joints And Muscular Pain 3Global Cell Culture Market 2014-2018: Key Vendors are Becton, Dickinson and Co, EMD, GE Healthcare, Lonza Group, Sigma Aldrich and Thermo Fisher Scientific 2CorMedix, Inc. Granted Extension of NYSE-MKT Listing 2CorMedix, Inc. Granted Extension of NYSE-MKT Listing 3
... , SOUTHAMPTON, Pa., Jan. 11 Argyce LLC, the trustee ... will divest the remaining drug development program assets of Genaera ... bids to be received no later than February 12, 2010 ... combination. Any person interested in purchasing the assets or learning ...
... PAREXEL International Corporation (Nasdaq: PRXL ) today raised its ... 2010 ended December 31, 2009, and for the full Fiscal ... financial guidance takes into account the projected impact from second ... amount and timing of a previously announced restructuring charge, and ...
... 7 ... , ... -- Genedata, a leading provider of advanced software solutions for drug discovery and life science ... experienced unprecedented industry adoption with 7 out of the 25 leading pharmaceutical companies using Screener ...
Cached Biology Technology:Genaera Liquidating Trust To Sell Remaining Proprietary Assets 2PAREXEL Issues Updated Financial And Operational Information 2PAREXEL Issues Updated Financial And Operational Information 3PAREXEL Issues Updated Financial And Operational Information 4PAREXEL Issues Updated Financial And Operational Information 5Genedata at HCA Announces Banner Year for Genedata Screener at Leading Pharmaceutical Companies 2Genedata at HCA Announces Banner Year for Genedata Screener at Leading Pharmaceutical Companies 3
(Date:7/24/2014)... where electric cars ply silent freeways, solar panels blanket ... the earth, from howling winds and from the blazing ... it is technically and economically feasible to convert California,s ... energy. Published in Energy , the plan shows ... supply in California that could create tens of thousands ...
(Date:7/24/2014)... of researchers has developed a new nanoscale agent for ... for assessing the function and properties of the GI ... and treatment of gut diseases. , Illnesses ... and inflammatory bowel disease all occur in the intestine ... with diseases such as diabetes and Parkinson,s. , ...
(Date:7/24/2014)... this week for an all-day public forum on a ... (EPA) to dredge toxic sediment from an eight-mile stretch ... called the plan, which proposes removing 4.3 million cubic ... riverbed, one of the largest cleanups in the agency,s ... off-site. , "We need to ensure the future well-being ...
Breaking Biology News(10 mins):Stanford study shows how to power California with wind, water and sun 2Stanford study shows how to power California with wind, water and sun 3Stanford study shows how to power California with wind, water and sun 4New imaging agent provides better picture of the gut 2Experts Weigh the Pros and Cons of a $1.7 Billion EPA Cleanup Plan for the Passaic River at an NJIT 2
... genomic DNA around nucleosomes in the cell nucleus makes ... (LMU) in Munich now describes a mechanism that allows ... transcription. In higher organisms the genomic DNA is ... called nucleosomes, each consisting of two pairs of four ...
... new report from the Institute of Medicine says schools should ... minutes of vigorous or moderate intensity activity during each school ... current evidence-based guidelines of at least an hour of vigorous ... which was released today. "Because children are in ...
... world,s largest and fastest growing open-access publishers, announces the ... and Biotechnology . A broad scope journal ... will provide a single open-access platform for diverse ... and discussed. Frontiers in Bioengineering and ...
Cached Biology News:Biochemistry: Unspooling DNA from nucleosomal disks 2Schools should provide students with daily physical activity, IOM recommends 2Frontiers launches new open-access journal in Bioengineering and Biotechnology 2
Agarase cleaves agarose to neoagaro-oligosaccharides, and is used for,quantitative, gentle recovery of DNA from low melting point agarose....
Request Info...
Recombinant Mouse Serpin A1/alpha-1-Antitrypsin, CF Protein Family: Coagulation, Serine Protease Regulators...
X-prolyl aminopeptidase (aminopeptidase P) 1, soluble...
Biology Products: