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 Decontaminating pesticide-polluted water using engineered nanomaterial and sunlight
16.01.2020 | Institut national de la recherche scientifique - INRS

nachricht TUM Agenda 2030: Combining forces for additive manufacturing
09.10.2019 | Technische Universität München

All articles from Process Engineering >>>

The most recent press releases about innovation >>>

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

Im Focus: A step towards controlling spin-dependent petahertz electronics by material defects

The operational speed of semiconductors in various electronic and optoelectronic devices is limited to several gigahertz (a billion oscillations per second). This constrains the upper limit of the operational speed of computing. Now researchers from the Max Planck Institute for the Structure and Dynamics of Matter in Hamburg, Germany, and the Indian Institute of Technology in Bombay have explained how these processes can be sped up through the use of light waves and defected solid materials.

Light waves perform several hundred trillion oscillations per second. Hence, it is natural to envision employing light oscillations to drive the electronic...

Im Focus: Freiburg researcher investigate the origins of surface texture

Most natural and artificial surfaces are rough: metals and even glasses that appear smooth to the naked eye can look like jagged mountain ranges under the microscope. There is currently no uniform theory about the origin of this roughness despite it being observed on all scales, from the atomic to the tectonic. Scientists suspect that the rough surface is formed by irreversible plastic deformation that occurs in many processes of mechanical machining of components such as milling.

Prof. Dr. Lars Pastewka from the Simulation group at the Department of Microsystems Engineering at the University of Freiburg and his team have simulated such...

Im Focus: Skyrmions like it hot: Spin structures are controllable even at high temperatures

Investigation of the temperature dependence of the skyrmion Hall effect reveals further insights into possible new data storage devices

The joint research project of Johannes Gutenberg University Mainz (JGU) and the Massachusetts Institute of Technology (MIT) that had previously demonstrated...

Im Focus: Making the internet more energy efficient through systemic optimization

Researchers at Chalmers University of Technology, Sweden, recently completed a 5-year research project looking at how to make fibre optic communications systems more energy efficient. Among their proposals are smart, error-correcting data chip circuits, which they refined to be 10 times less energy consumptive. The project has yielded several scientific articles, in publications including Nature Communications.

Streaming films and music, scrolling through social media, and using cloud-based storage services are everyday activities now.

Im Focus: New synthesis methods enhance 3D chemical space for drug discovery

After helping develop a new approach for organic synthesis -- carbon-hydrogen functionalization -- scientists at Emory University are now showing how this approach may apply to drug discovery. Nature Catalysis published their most recent work -- a streamlined process for making a three-dimensional scaffold of keen interest to the pharmaceutical industry.

"Our tools open up whole new chemical space for potential drug targets," says Huw Davies, Emory professor of organic chemistry and senior author of the paper.

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

70th Lindau Nobel Laureate Meeting: Around 70 Laureates set to meet with young scientists from approx. 100 countries

12.02.2020 | Event News

11th Advanced Battery Power Conference, March 24-25, 2020 in Münster/Germany

16.01.2020 | Event News

Laser Colloquium Hydrogen LKH2: fast and reliable fuel cell manufacturing

15.01.2020 | Event News

 
Latest News

NUI Galway highlights reproductive flexibility in hydractinia, a Galway bay jellyfish

24.02.2020 | Life Sciences

KIST researchers develop high-capacity EV battery materials that double driving range

24.02.2020 | Materials Sciences

How earthquakes deform gravity

24.02.2020 | Earth Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>