Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


DHgate

Home > News > Porphyrin and carbon nanotube assemblies in polar solvents

January 2nd, 2008

Porphyrin and carbon nanotube assemblies in polar solvents

Abstract:
One of the chief obstacles to exploiting the useful electronic and materials properties of single-wall carbon nanotubes (SWCNTs) is their inclination to form ropes and bundles. Understanding the reaction paths involved in the transition from isolated SWCNTs to bundles in the presence of solvent is basic to controlling the process. Single- and multiple-wall carbon nanotubes (CNTs) in polar, or charged, solvents can also form aggregate assemblies and macromolecular complexes with porphyrin derivatives. This potential is of great interest, as the structural and optical properties of porphyrin derivatives and complexes can be easily engineered, a reality evident not just in the laboratory but also in nature. Indeed, in photosynthesis and other processes, the quantum mechanisms governing charge and energy transfer processes are fundamental to life.

Recent experiments investigating CNTs in amide solvents have led to the debatable conclusion that dispersion and partial debundling can be achieved at low nanotube concentrations with a variety of highly polar solvents possessing high surface tension.1 Among these, N-methylpyrrolidone (NMP) is considered to be the most effective. In particular, it has been postulated that at very low concentrations, the equilibrium (stable) state is a debundled one. Moreover, whether dispersion occurs appears to depend strongly on the method of sample preparation. Taken together, these results suggest that the debundled state is, in fact, not in equilibrium but is metastable (transient though relatively long-lived).

Source:
spie.org

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

Chemistry

March 2016; 6th Int'l Conference on Nanostructures in Iran July 29th, 2015

Meet the high-performance single-molecule diode: Major milestone in molecular electronics scored by Berkeley Lab and Columbia University team July 29th, 2015

'Seeing' molecular interactions could give boost to organic electronics July 28th, 2015

Quantum networks: Back and forth are not equal distances! July 28th, 2015

Nanotubes/Buckyballs/Fullerenes

Self-assembling, biomimetic membranes may aid water filtration August 1st, 2015

Controlling Dynamic Behavior of Carbon Nanosheets in Structures Made Possible July 30th, 2015

March 2016; 6th Int'l Conference on Nanostructures in Iran July 29th, 2015

Short wavelength plasmons observed in nanotubes: Berkeley Lab researchers create Ludinger liquid plasmons in metallic SWNTs July 28th, 2015

Discoveries

Gold-diamond nanodevice for hyperlocalised cancer therapy: Gold nanorods can be used as remote controlled nanoheaters delivering the right amount of thermal treatment to cancer cells, thanks to diamond nanocrystals used as temperature sensors August 1st, 2015

Shaping the hilly landscapes of a semi-conductor nanoworld August 1st, 2015

Solid state physics: Quantum matter stuck in unrest August 1st, 2015

Self-assembling, biomimetic membranes may aid water filtration August 1st, 2015

Announcements

Self-assembling, biomimetic membranes may aid water filtration August 1st, 2015

Transparent, electrically conductive network of encapsulated silver nanowires: A novel electrode for optoelectronics August 1st, 2015

Harris & Harris Group Portfolio Company, HZO, Announces Partnerships with Dell and Motorola August 1st, 2015

Advances and Applications in Biosensing, Sensor Power, and Sensor R&D to be Covered at Sensors Global Summit August 1st, 2015

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project