Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

UB Engineer Develops Novel Method for Assembly of Nanoparticles

03.12.2002


Process may lead to manufacture of nanoscale devices



A University at Buffalo engineer has developed a novel method for assembling nanoparticles into three-dimensional structures that one day may be used to produce new nanoscale tools and machines.

The work could be an important step in fulfilling the immense potential of nanotechnology because it gives scientists and engineers improved control and flexibility in the creation of materials for the manufacture of many nanoscale devices, according to Paschalis Alexandridis, associate professor of chemical engineering in UB’s School of Engineering and Applied Sciences.


Alexandridis and postdoctoral research associate Aristides Docoslis used non-uniform AC electric fields generated by microfabricated electrodes -- which create a motion known as dielectrophoresis -- to stack latex, silica or graphite microparticles into two- and three-dimensional structures of prescribed lengths and composition, held together by the electrical field.

The same process can be applied to nanoparticles, says Alexandridis, whose research is funded by a $100,000 Nanoscale Exploratory Research (NER) grant from the National Science Foundation, Division of Design, Manufacture and Industrial Innovation.

"This process enables you to guide particles to where you want them to go and then scale them up into ordered structures with desired electrical, optical or mechanical properties," explains Alexandridis.

"You can use this process to create a well-defined object and assemble it on demand, which means these materials can actually be used to manufacture nanoscale tools or devices," he adds. "This may be particularly applicable for the manufacture of sensors and photonic devices."

Adaptability is an attractive feature of the process, Alexandridis says. The process can be used to direct and manipulate almost any particle, he explains, whether the particle has a net charge or not, or is suspended in an aqueous or non-aqueous medium.

"Because of this flexibility, there’s no limit to the applications of this process," Alexandridis says. "That’s another advantage for the manufacturability of this method."

Focusing on the dielectrophoresis process, Alexandridis is developing models to predict how various particles, and combination of particles, will behave under the influence of different electrical fields, as a function of particle size and properties, electrode dimensions and pattern, and applied voltage and frequency. This information will help guide future nanomanufacturing applications, he says.

Alexandridis also is developing ways to glue particles together after the electrical field has assembled them.

"The goal is to link the particles in a way that doesn’t change the properties of the structure, but which makes the structure permanent and resilient," he says. "After you glue the particles together you can switch off the electrical field and have a free-standing, ordered structure."

"Or you can change the field frequency so that you can remove selectively the unglued particles," he adds.

Results from Alexandridis’ and Docoslis’ research were published recently in Electrophoresis (2002, 23, 2174-2183).

Nanotechnology is a potentially revolutionary and lucrative scientific industry, with experts predicting manufacture and commercialization of microscopic products benefiting the fields of electronics, medicine, supercomputing, energy and environmental cleanup.

John Della Contrada | EurekAlert!

More articles from Process Engineering:

nachricht Fraunhofer researchers develop measuring system for ZF factory in Saarbrücken
21.11.2017 | Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP

nachricht New manufacturing process for SiC power devices opens market to more competition
14.09.2017 | North Carolina State University

All articles from Process Engineering >>>

The most recent press releases about innovation >>>

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

Im Focus: Nanoparticles help with malaria diagnosis – new rapid test in development

The WHO reports an estimated 429,000 malaria deaths each year. The disease mostly affects tropical and subtropical regions and in particular the African continent. The Fraunhofer Institute for Silicate Research ISC teamed up with the Fraunhofer Institute for Molecular Biology and Applied Ecology IME and the Institute of Tropical Medicine at the University of Tübingen for a new test method to detect malaria parasites in blood. The idea of the research project “NanoFRET” is to develop a highly sensitive and reliable rapid diagnostic test so that patient treatment can begin as early as possible.

Malaria is caused by parasites transmitted by mosquito bite. The most dangerous form of malaria is malaria tropica. Left untreated, it is fatal in most cases....

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

Previous evidence of water on mars now identified as grainflows

21.11.2017 | Physics and Astronomy

NASA's James Webb Space Telescope completes final cryogenic testing

21.11.2017 | Physics and Astronomy

New catalyst controls activation of a carbon-hydrogen bond

21.11.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>