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

Chemical cages: New technique advances synthetic biology February 10th, 2016

Graphene decharging and molecular shielding February 8th, 2016

Scientists take key step toward custom-made nanoscale chemical factories: Berkeley Lab researchers part of team that creates new function in tiny protein shell structures February 6th, 2016

Discovery of the specific properties of graphite-based carbon materials February 6th, 2016

Nanotubes/Buckyballs/Fullerenes

Superconductivity: Footballs with no resistance - Indications of light-induced lossless electricity transmission in fullerenes contribute to the search for superconducting materials for practical applications February 9th, 2016

The iron stepping stones to better wearable tech without semiconductors February 8th, 2016

Nano-coating makes coaxial cables lighter: Rice University scientists replace metal with carbon nanotubes for aerospace use January 28th, 2016

Scientists provide new guideline for synthesis of fullerene electron acceptors January 28th, 2016

Discoveries

Nanoparticle reduces targeted cancer drug's toxicity February 11th, 2016

Scientists take nanoparticle snapshots February 10th, 2016

Chemical cages: New technique advances synthetic biology February 10th, 2016

New thin film transistor may lead to flexible devices: Researchers engineer an electronics first, opening door to flexible electronics February 10th, 2016

Announcements

Nanoparticle reduces targeted cancer drug's toxicity February 11th, 2016

Cima NanoTech Debuts Large Interactive Touch Screens with European Customers at ISE 2016: For the first time in Europe, Cima NanoTech’s wide range of high performance, projected capacitive touch modules are showcased February 11th, 2016

Composite Pipe Long Term Testing Facility February 10th, 2016

Scientists take nanoparticle snapshots February 10th, 2016

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







Car Brands
Buy website traffic