Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Producing "synthetic metals" with radiation

07.04.2008
This week, UPM unveiled their latest research at the World's Largest Market-Place for Inventions in Geneva. This research is on a technique to transform non-conducting organic polymers into electricity conducting "synthetic metals" using radiation, which can be used for artificial muscles, antistatic clothing, rechargeable batteries and more

This week, University Putra Malaysia's team unveiled their latest inventions and products at the 34th International Exhibition of Inventions, New Techniques and Products in Geneva (April 2-6, 2008), also known as the World's Largest Market-Place for Inventions.

This research is on a technique to transform non-conducting organic polymers into electricity conducting "synthetic metals" using radiation. These "synthetic metals" can be used for electromagnetic shielding, artificial muscles, active electronic devices, antistatic clothing, rechargeable batteries, ion exchange membranes, electrical display, chemical and biochemical sensors, electrochemical actuators, switches, and molecular electronics.

TITLE: Polymerization of PVA/PANI Conducting Polymer Blends by Radiation Technique

RESEARCHERS: Elias Saion, Muhammed Ahmed Ali Omar, Azian Osman, Khrulzaman Mohd Dahlan, Taiman Kadni, Shahril Hashim.

Department of Physics
Faculty of Science
Universiti Putra Malaysia, 43400 UPM,
Serdang, Selangor, Malaysia.
Tel: +603-89466654
Email: elias@
Most of organic polymers are insulators. However, those with conjugated ƒà-electron backbones could be transformed into conducting polymers when they are treated with strong oxidizing or reducing agents. The pi-bonds are localized structural defects in the polymer chain known as polorons that allow conducting electricity. These ¡¥synthetic metals¡¦ have been attracted much attention from both fundamental scientific concepts and potential for new technology due to their excellent optical, electronic, and electrochemical properties. They offer a wide variety of new application including electromagnetic shielding, artificial muscles, active electronic devices, antistatic clothing, rechargeable batteries, ion exchange membranes, electrical display, chemical and biochemical sensors, electrochemical actuators, switches, and molecular electronics. Among these polymers, polyaniline (PANI) generates a special interest owing to its relative high conductivity and low cost, exhibit excellent environmental stability, and its polymerization is straightforward and proceeds with high yield. Polymerization of PANI is normally achieved by chemical doping process involving charge transfer through oxidation (p-type doping) or reduction (n-type doping) and by electrochemical doping process in which electrode supplies the redox charge to the conducting polymer, while ions diffuse into the conducting polymer from the electrolyte to compensate the electronic charge. We offer a new route for synthesizing PANI by radiation method through bond scission of Cl- ions and aniline radical from aniline hydrochloride (AniHCl) blended in polyvinyl alcohol (PVA). The PVA/AniHCl blend films were prepared by solvent casting in air. The influence of the 1.25-MeV gamma-ray dose and the polymerization kinetics were investigated by means of visible absorption spectroscopy, XRD, and conductivity measurements. The polymerization of PANI was evident as the blends change colour from white to dark green, peaking at the absorption band of 780 nm, which is the colour of PANI. There is a significant reduction in the peak intensity at the diffraction angle of 19.5o, as the dose increases to 50 kGy, indicating the crystalline phase of the blends has been transformed into the amorphous phase due to the polymerization of PANI. This allows an easy passage of electrical current through the blends as the conductivity increases rapidly from 1.0 x 10-6 S/cm at 0 Gy to 3.0 x 10-1 S/cm at 50 kGy due to increase number of polarons formed in PANI. This study reveals the possibility to develop PVA/PANI conducting polymer blends from PVA/AniHCl blends by using radiation technique.

Dr Nayan KANWAL | ResearchSEA
Further information:
http://www.inventions-geneva.ch/
http://www.putra.upm.edu.my
http://www.researchsea.com

More articles from Physics and Astronomy:

nachricht Transportable laser
23.01.2018 | Physikalisch-Technische Bundesanstalt (PTB)

nachricht New for three types of extreme-energy space particles: Theory shows unified origin
23.01.2018 | Penn State

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Optical Nanoscope Allows Imaging of Quantum Dots

Physicists have developed a technique based on optical microscopy that can be used to create images of atoms on the nanoscale. In particular, the new method allows the imaging of quantum dots in a semiconductor chip. Together with colleagues from the University of Bochum, scientists from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute reported the findings in the journal Nature Photonics.

Microscopes allow us to see structures that are otherwise invisible to the human eye. However, conventional optical microscopes cannot be used to image...

Im Focus: Artificial agent designs quantum experiments

On the way to an intelligent laboratory, physicists from Innsbruck and Vienna present an artificial agent that autonomously designs quantum experiments. In initial experiments, the system has independently (re)discovered experimental techniques that are nowadays standard in modern quantum optical laboratories. This shows how machines could play a more creative role in research in the future.

We carry smartphones in our pockets, the streets are dotted with semi-autonomous cars, but in the research laboratory experiments are still being designed by...

Im Focus: Scientists decipher key principle behind reaction of metalloenzymes

So-called pre-distorted states accelerate photochemical reactions too

What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...

Im Focus: The first precise measurement of a single molecule's effective charge

For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.

Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...

Im Focus: Paradigm shift in Paris: Encouraging an holistic view of laser machining

At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.

No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

10th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Münster, 10-11 April 2018

08.01.2018 | Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

 
Latest News

Rutgers scientists discover 'Legos of life'

23.01.2018 | Life Sciences

Seabed mining could destroy ecosystems

23.01.2018 | Earth Sciences

Transportable laser

23.01.2018 | Physics and Astronomy

VideoLinks Science & Research
Overview of more VideoLinks >>>