The invention, which opens new avenues for controlling chemical signals, is being published in the coming issue of the highly ranked scientific journal PNAS. The authors are Klas Tybrandt and Magnus Berggren of Linköping University, who developed the invention, and Karin Larsson and Agneta Richter-Dahlfors at the Karolinska Institute, who have used it in experiments with cultivated nerve cells.
The four scientists work at the OBOE Research Center, which is dedicated to the study and regulation of processes in living cells and tissue through the use of organic electronics.
Previously use has been made of nano-canals and nano-pores to actively control the concentration and transport of ions. But such components are difficult to produce and moreover function poorly when the salt content is high, which is a precondition in interaction with biological systems.
"To get around these problems, we exploited the similarity between ion-selective membranes - plastics that only conduct ions of one charge - and doped semiconductors, such as silicon. It was previously known that it is possible to produce diodes from such membranes. We took it a step further by joining two ion diodes into a transistor," says Klas Tybrandt, a doctoral candidate in organic electronics.
When an ion transistor was connected to cultivated nerve cells, it could be used to control the supply of the signal substance acetylcholin locally to the cells. The successful result demonstrates both that the component functions together with biological systems and that even tiny charged biomolecules can be transported without difficulty.
"Since the ion transistor is made of plastic, it can be integrated with other components we are developing. This means we can make use of inexpensive printing processes on flexible materials. We believe ion transistors will play a major role in various applications, such as the controlled delivery of drugs, lab-on-a-chip and sensors," says Magnus Berggren, Önnesjö professor of organic electronics.
Article: Ion bipolar junction transistors by Klas Tybrandt, Karin C. Larsson, Agneta Richter-Dahlfors, and Magnus Berggren, PNAS Ahead of print May 17 2010.
Contact: Klas Tybrandt phone: +46 (0)11-363334, mobile: +46 (0)70-4997772, email@example.com and Magnus Berggren phone: +46 (0)11-363637, mobile: +46 (0)709-783430, firstname.lastname@example.org
Pressofficer Åke Hjelm; åka.email@example.com; +46-13281 395
LZH optimizes laser-based CFRP reworking for the aircraft industry
24.11.2016 | Laser Zentrum Hannover e.V.
eldec generators CUSTOM LINE: Customized energy source for perfect induction heating
23.11.2016 | EMAG eldec Induction GmbH
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
Broadband rotational spectroscopy unravels structural reshaping of isolated molecules in the gas phase to accommodate water
In two recent publications in the Journal of Chemical Physics and in the Journal of Physical Chemistry Letters, researchers around Melanie Schnell from the Max...
The efficiency of power electronic systems is not solely dependent on electrical efficiency but also on weight, for example, in mobile systems. When the weight of relevant components and devices in airplanes, for instance, is reduced, fuel savings can be achieved and correspondingly greenhouse gas emissions decreased. New materials and components based on gallium nitride (GaN) can help to reduce weight and increase the efficiency. With these new materials, power electronic switches can be operated at higher switching frequency, resulting in higher power density and lower material costs.
Researchers at the Fraunhofer Institute for Solar Energy Systems ISE together with partners have investigated how these materials can be used to make power...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
02.12.2016 | Medical Engineering
02.12.2016 | Agricultural and Forestry Science
02.12.2016 | Physics and Astronomy