Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Ames Laboratory scientist using low-gravity space station lab to study crystal growth

23.09.2009
Real time space experiments controlled by Earth-bound researcher

A research project 10 years in the making is now orbiting the Earth, much to the delight of its creator Rohit Trivedi, a senior metallurgist at the U.S. Department of Energy’s Ames Laboratory. Equipment recently delivered to the International Space Station by the Space Shuttle Discovery will allow the Earth-bound Trivedi to conduct crystal growth experiments he first conceived more than a decade ago.

The equipment is actually a mini laboratory, known as DECLIC – DEvice for the study of Critical LIquids and Crystallization – will allow Trivedi to study and even control crystal growth pattern experiments, in real time, from his laboratory in Wilhelm Hall on the Iowa State University campus in Ames. The goal is to use the microgravity environment on board the Space Station to determine how materials form crystals as they move from liquid to solid and what effect variations in growth conditions have on crystallization patterns.

“When materials ‘freeze’ there are specific crystalline growth patterns that appear,” Trivedi said, “and there are fundamental physics that govern these patterns. However, small effects can have significant influence on the patterns that form. Snow flakes, for example, form the same basic six-sided pattern, but because of minute variations, no two are exactly alike. These crystallization patterns play a critical role in governing the properties of a solidified material”

Trivedi hopes the experiments will help explain how certain materials, under certain conditions produce particular crystal growth patterns, such as these nickel-based superconductors.

The equipment is actually a mini laboratory, known as DECLIC – DEvice for the study of Critical LIquids and Crystallization – will allow Trivedi to study and even control crystal growth pattern experiments, in real time, from his laboratory in Wilhelm Hall on the Iowa State University campus in Ames. The goal is to use the microgravity environment on board the Space Station to determine how materials form crystals as they move from liquid to solid and what effect variations in growth conditions have on crystallization patterns.

“When materials ‘freeze’ there are specific crystalline growth patterns that appear,” Trivedi said, “and there are fundamental physics that govern these patterns. However, small effects can have significant influence on the patterns that form. Snow flakes, for example, form the same basic six-sided pattern, but because of minute variations, no two are exactly alike. These crystallization patterns play a critical role in governing the properties of a solidified material”

While Trivedi, who is also an ISU distinguished professor of materials science and engineering, studies primarily metals, the material to be used in the DECLIC experiments is a transparent, wax-like substance called succinonitrile. With a relatively low melting point, 57 degrees Celsius, the material lends itself to study in the controlled confines of the Space Station, and its transparency will make it possible for researchers to view the crystal growth process as the material solidifies. However, the basic principles governing crystal growth will be the same.

So why conduct the experiment in low gravity? Trivedi hopes that the low gravity will “erase” the effects of convection, the natural circulation of fluid.

“On Earth, the small effects are masked by convection,” he said. “We hope that in a low-gravity environment, convection will be minimized so that we can more clearly see the importance of the small effects and see how the experimental data match our theoretical modeling.”

Much of that modeling has been done by collaboration with Trivedi’s colleague, Alain Karma, a theoretical physicist at Northeastern University in Boston. The pair has also collaborated closely with the Centre National d'Etudes Spatiales (CNES), the French government space agency that along with NASA, helped fund the work.

After preliminary testing in September, DECLIC is scheduled to be online in October and the first set of experiments will run through February 2010 according to Trivedi. Through a connection with the computation center in Toulouse, France, Trivedi’s research group will be able to view video of the material as it solidifies. To pick up the necessary detail, Trivedi’s lab is outfitted with a big-screen, high definition monitor. But they won’t be just passive spectators.

“If we see something unusual, we can repeat the experiment, all in real time,” Trivedi said. “Likewise, if we don’t see much happening, we can alter the conditions and move on.”

All the video from the DECLIC experiments will be captured and stored for future reference by CNES in Toulouse, France. Trivedi’s research proposal was originally selected by NASA for funding back in 1998, receiving approximately $2 million in total through ISU’s Institute for Physical Research and Technology, and was later selected as one of only six projects in materials science selected for actual flight. To now be this close to seeing the project in operation is exciting for Trivedi.

“It’s been a long time since we started,” Trivedi said, “but it’s also given us time to finalize the experiments and work on the theoretical side. Now we’re just anxious to get experimental results to see if things behave as we expect.”

Trivedi’s research isn’t the only Ames Laboratory science in outer space. Materials developed at the Lab’s Materials Preparation Center are on board the Planck satellite as part of the instrument cooling system.

Ames Laboratory is a U.S. Department of Energy Office of Science laboratory operated for the DOE by Iowa State University. Ames Laboratory creates innovative materials, technologies and energy solutions. We use our expertise, unique capabilities and interdisciplinary collaborations to solve global challenges.

Kerry Gibson | EurekAlert!
Further information:
http://www.ameslab.gov

More articles from Materials Sciences:

nachricht A new tool for discovering nanoporous materials
23.05.2017 | Ecole Polytechnique Fédérale de Lausanne

nachricht Did you know that packaging is becoming intelligent through flash systems?
23.05.2017 | Heraeus Noblelight GmbH

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: A quantum walk of photons

Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.

The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....

Im Focus: Turmoil in sluggish electrons’ existence

An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.

We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...

Im Focus: Wafer-thin Magnetic Materials Developed for Future Quantum Technologies

Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.

Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...

Im Focus: World's thinnest hologram paves path to new 3-D world

Nano-hologram paves way for integration of 3-D holography into everyday electronics

An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...

Im Focus: Using graphene to create quantum bits

In the race to produce a quantum computer, a number of projects are seeking a way to create quantum bits -- or qubits -- that are stable, meaning they are not much affected by changes in their environment. This normally needs highly nonlinear non-dissipative elements capable of functioning at very low temperatures.

In pursuit of this goal, researchers at EPFL's Laboratory of Photonics and Quantum Measurements LPQM (STI/SB), have investigated a nonlinear graphene-based...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Marine Conservation: IASS Contributes to UN Ocean Conference in New York on 5-9 June

24.05.2017 | Event News

AWK Aachen Machine Tool Colloquium 2017: Internet of Production for Agile Enterprises

23.05.2017 | Event News

Dortmund MST Conference presents Individualized Healthcare Solutions with micro and nanotechnology

22.05.2017 | Event News

 
Latest News

Physicists discover mechanism behind granular capillary effect

24.05.2017 | Physics and Astronomy

Measured for the first time: Direction of light waves changed by quantum effect

24.05.2017 | Physics and Astronomy

Marine Conservation: IASS Contributes to UN Ocean Conference in New York on 5-9 June

24.05.2017 | Event News

VideoLinks
B2B-VideoLinks
More VideoLinks >>>