Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Painkiller by Photosynthesis

Selective and effective: silicon nanowires as photoelectrodes for carbon dioxide fixation
Selective and effective: silicon nanowires as photoelectrodes for carbon dioxide fixation

Abstract:
During photosynthesis, plants capture solar energy and use it to drive chemical reactions. Their carbon source is the CO2 in air. Now, in new work, American scientists have proposed a new reaction mechanism that binds CO2 and strongly resembles photosynthesis. In this process, light energy is captured by silicon nanowires. It was successfully used to synthesize two precursors of the anti-inflammatory, pain reducing drugs ibuprofen and naproxen.

Painkiller by Photosynthesis

Germany | Posted on June 14th, 2012

Natural photosynthesis involves two processes, the light and dark reactions. In the light reactions, photons are captured and their energy stored in the form of chemical compounds like NADPH (nicotinamide adenine dinucleotide phosphate) and ATP (adenosine triphosphate), which subsequently are used to bind CO2 for the synthesis of complex sugar molecules. At the heart of the dark reactions, on the other hand, is the binding of CO2 to a sugar phosphate (ribulose-1,5-bisphosphate). This results in formation of a β-keto acid, which gets converted to a central building block for sugar synthesis.

A team led by Kian L. Tan and Dunwei Wang at Boston College (Chestnut Hill, USA) has been inspired by the mechanisms of the dark reactions. To capture sunlight, the scientists used p-doped silicon nanowires as a photocathode. These very effectively convert solar energy to electrical energy, are easy to produce, and are amazingly stable under the reaction conditions needed. Captured photons release electrons from the atoms in the nanowires. These electrons can easily be transferred to organic molecules to trigger chemical reactions.

The researchers chose aromatic ketones as their starting materials. Transfer of electrons from the photocathode "activates" these molecules so that they can attack and bind CO2. Over several steps, the reaction produces an α-hydroxy acid. This allowed the team to produce precursors of ibuprofen and naproxen with high selectivity and in high yield.

This reaction sequence closely resembles natural photosynthesis and is completely different from previous approaches to binding CO2 with the aid of sunlight. This finally solves a problem: The very poor selectivity that automatically accompanies all traditional attempts at the direct photoreduction of CO2 has limited previous methods to the production of fuels. This new strategy delivers the selectivity required for the production of complex organic intermediates for the production of pharmaceuticals and high-value fine chemicals.

####

For more information, please click here

Copyright © Wiley-VCH Materials Science Journals

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

Link to the original paper on Wiley Online Library:

Related News Press

Chemistry

Iranian Scientists Separate Zinc Ion at Low Concentrations September 20th, 2014

News and information

Iranian Researchers Synthesize Stable Ceramic Nanopowders at Room Temperature September 20th, 2014

Arrowhead to Present at BioCentury's NewsMakers in the Biotech Industry Conference September 19th, 2014

SouthWest NanoTechnologies (SWeNT) Receives NIST Small Business Innovation Research (SBIR) Phase 1 Award to Produce Greater than 99% Semiconducting Single-Wall Carbon Nanotubes September 19th, 2014

Toward optical chips: A promising light source for optoelectronic chips can be tuned to different frequencies September 19th, 2014

Nanomedicine

Arrowhead to Present at BioCentury's NewsMakers in the Biotech Industry Conference September 19th, 2014

The Pocket Project will develop a low-cost and accurate point-of-care test to diagnose Tuberculosis: ICN2 holds a follow-up meeting of the Project on September 18th - 19th September 18th, 2014

New non-invasive technique could revolutionize the imaging of metastatic cancer September 17th, 2014

Recruiting bacteria to be technology innovation partners: September 17th, 2014

Discoveries

Iranian Scientists Separate Zinc Ion at Low Concentrations September 20th, 2014

Iranian Researchers Synthesize Stable Ceramic Nanopowders at Room Temperature September 20th, 2014

Toward optical chips: A promising light source for optoelectronic chips can be tuned to different frequencies September 19th, 2014

New research points to graphene as a flexible, low-cost touchscreen solution September 19th, 2014

Announcements

Iranian Scientists Separate Zinc Ion at Low Concentrations September 20th, 2014

Arrowhead to Present at BioCentury's NewsMakers in the Biotech Industry Conference September 19th, 2014

SouthWest NanoTechnologies (SWeNT) Receives NIST Small Business Innovation Research (SBIR) Phase 1 Award to Produce Greater than 99% Semiconducting Single-Wall Carbon Nanotubes September 19th, 2014

Toward optical chips: A promising light source for optoelectronic chips can be tuned to different frequencies September 19th, 2014

Energy

Iranian Researchers Synthesize Stable Ceramic Nanopowders at Room Temperature September 20th, 2014

IEEE International Electron Devices Meeting To Celebrate 60th Anniversary as The Leading Technical Conference for Advanced Semiconductor Devices September 18th, 2014

Rice rolls 'neat' nanotube fibers: Rice University researchers' acid-free approach leads to strong conductive carbon threads September 15th, 2014

Simple, Cost-Effective Method Proposed for Synthesizing Zinc Oxide Nanopigments September 15th, 2014

Solar/Photovoltaic

Simple, Cost-Effective Method Proposed for Synthesizing Zinc Oxide Nanopigments September 15th, 2014

Indium/Copper Sulfide Compound Semi-Conductor Synthesized through New Method September 8th, 2014

Material development on the nanoscale: Doped graphene nanoribbons with potential September 8th, 2014

Layered graphene sandwich for next generation electronics September 8th, 2014

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







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE