Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

On the way to perfect glass

30.05.2005

Researchers from the United Kingdom, France and the DUBBLE beamline at the European Synchrotron Radiation Facility (ESRF) have made a step forward in research on glass. They have monitored the change in the structure of zeolites, crystalline solids, into an almost perfect glass when heated. They have done this by recording vibrations involving groups of atoms in zeolites that subsequently characterise the glass. Their results are published in the last issue of Science.

Zeolites are porous crystalline aluminosilicates, presenting a regular arrangement of cages. In their natural state, they are components of soils and can be barriers against the migration of radioactive elements. In their synthetic form, zeolites are industrially applied as components of washing powders and in the cracking of petroleum to make gasoline. Due to their cage structure, zeolites have a low-density structure. They melt at around 900°C, lower temperatures than most similar materials, such as silica (sand), which melts at twice this temperature. If the heating is carried out at a slow rate, low-frequency vibrational modes are responsible for destabilizing the microporous crystalline structure. When the cages collapse, zeolites contract, becoming 60% more denseheavier than in their original form, and they adopt the structure of a glass. “We have discovered the triggering mechanism”, says Neville Greaves, first author of the paper.

The result is a mechanically and chemically stronger glass than the glass used nowadays. “We believe this is the key to the synthesis of perfect glasses”, asserts Neville Greaves. Would this mean no more broken wine glasses? “This research could lead to that, but it is still far away. This would also mean making glass invulnerable to water, for instance”, he explains. The final aim is to find out the conditions in which the perfect glass forms.

Scientists from the University of Wales, Aberystwyth, the DUBBLE beamline at the ESRF, the Ecole Nationale Supérieure de Chimie of Paris (ENSCP) and ISIS have characterized the low-frequency vibrations that appear in zeolites during heating. The team has carried out their research in neutron as well as X-ray facilities. ISIS is a neutron and muon source located in the UK and a large part of the research presented was done there. The researchers also used a unique X-ray diffraction technique on the Dutch-Belgian beamline (DUBBLE) at the ESRF to determine the degree of crystallinity from zeolites to glass, critical to evaluate the neutron scattering results. “It is really great to combine synchrotron and neutron techniques in the same observation”, explains Greaves.

Montserrat Capellas | alfa
Further information:
http://www.esrf.fr/NewsAndEvents/PressReleases/prefect_glass/
http://www.esrf.fr

More articles from Physics and Astronomy:

nachricht UNH scientists help provide first-ever views of elusive energy explosion
16.11.2018 | University of New Hampshire

nachricht NASA keeps watch over space explosions
16.11.2018 | NASA/Goddard Space Flight Center

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: UNH scientists help provide first-ever views of elusive energy explosion

Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.

Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...

Im Focus: A Chip with Blood Vessels

Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.

Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...

Im Focus: A Leap Into Quantum Technology

Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.

In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...

Im Focus: Research icebreaker Polarstern begins the Antarctic season

What does it look like below the ice shelf of the calved massive iceberg A68?

On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.

Im Focus: Penn engineers develop ultrathin, ultralight 'nanocardboard'

When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure

Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

“3rd Conference on Laser Polishing – LaP 2018” Attracts International Experts and Users

09.11.2018 | Event News

On the brain’s ability to find the right direction

06.11.2018 | Event News

European Space Talks: Weltraumschrott – eine Gefahr für die Gesellschaft?

23.10.2018 | Event News

 
Latest News

Purdue cancer identity technology makes it easier to find a tumor's 'address'

16.11.2018 | Health and Medicine

Good preparation is half the digestion

16.11.2018 | Life Sciences

Microscope measures muscle weakness

16.11.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>