 |
|
The gigantic respiration of crystalline solids
April 02, 2007Previously, only amorphous polymer materials approached such levels of performance. On the other hand, these "gigantic respiration" and their respiration, which takes place at constant overall shape, is reversible. This discovery, of interest for numerous industrial applications, is published in the journal Science on March 30, 2007.
The phenomenon of respiration is normally associated with life. It is characterized by a reversible variation in the volume of a species under the effect of a stimulus (gas, pressure, temperature, irradiation, etc.). The volume of the lungs, for example, expands by 40 percent when breathing in. Organic matter, known for its flexibility, is well suited to this phenomenon. On the other hand, inorganic matter is very often associated with the idea of rigidity and non-deformability. Researchers from the Institut Lavoisier (CNRS/Université de Versailles Saint-Quentin-en-Yvelines) have recently demonstrated that the hybrid material (which combines both inorganic and organic entities) can be deformed in a reversible manner.
Within the framework of their studies on porous systems, GĂ©rard FĂ©rey and his team at the Institut Lavoisier have discovered a new family of trivalent metal dicarboxylates, which possess unprecedented respiration properties. Depending on the nature of the organic entity, the variation in volume when these solids are immersed in a solvent (water, methanol, etc.) can exceed 300 percent. Only some amorphous polymers approach this level of performance. However, unlike such polymers, the new solids are crystalline. The researchers determined their crystallographic structure in each state (solvated or not) and provided an explanation for the respiration mechanism, which takes place at constant overall shape, without any apparent rupture of bonds at the atomic level. The reversibility of the phenomenon is therefore facilitated.
A laboratory curiosity? Certainly not: given the selectivity of its adsorption of solvents, this new family of solids has already been used in separation applications. Another flexible solid stemming from the laboratory has also been produced on an industrial scale for its hydrogen storage properties. And that is only a start!
CNRS
A laboratory curiosity? Certainly not: given the selectivity of its adsorption of solvents, this new family of solids has already been used in separation applications. Another flexible solid stemming from the laboratory has also been produced on an industrial scale for its hydrogen storage properties. And that is only a start!
CNRS
Unravelling the 'inconvenient truth' of glacier movement
Predicting climate change depends on many factors not properly included in current forecasting models, such as how the major polar ice caps will move in the event of melting around their edges.
Novel organic metal hybrids that will revolutionize materials science and chemical engineering
A novel class of hybrid materials made from metals and organic compounds is changing the face of solid state chemistry and materials science just 10 years after its discovery, with applications already in safe storage of highly inflammable gases such as hydrogen and methane.
More Crystalline Solids Current Events and Crystalline Solids News Articles
 |
Tunneling Systems in Amorphous and Crystalline Solids by Pablo Esquinazi (Editor) The book contains the contributions from research scientists (experimentalists and theoreticians) who have recently made outstanding systematic investigations with low-temperature properties of solids that are sensitive to quantum tunneling processes. Low-temperature thermodynamic and acoustic properties, optical hole burning, and dielectric properties of different solids, such as amorphous dielectrics (including polymers, superconductors, polycrystalline metals, and metallic and semiconducting crystals) with light impurities (H and D) are reviewed and discussed in terms of interactions with and between tunneling systems. The newest experiments on long-time spectral diffusion and heat release, electric field and strain effects, and non-equilibrium phenomena are also discussed. |
 |
Solid 14KT White Gold Crystalline CZ Heart Gem SOLITAIRE Belly Ring by Body Candy Solid 14KT Yellow Gold Genuine Diamond HEART Spiral Toe Ring Solid 14kt gold toe ring. This spiral design adjustable solid gold toe ring features genuine diamonds. This beautiful solid gold heart design toe ring is encrusted with genuine diamonds for a most spectacular look. Add Bodycandy body jewelry at wholesale prices to your collection today! Specifications: Adjustable SOLID 14kt Gold Toe Ring, with genuine diamonds. One Size Fits Most. Solid 14kt Gold Toe ring body jewelry ... |
|
Mechanical Behavior of Crystalline Solid by Proceedings (Author) | |
|
Mechanical Behavior of Crystalline Solids. by National Bureau of Standards (ed) (Author), Diagrams and photos (Illustrator) | |
|
Mechanical Behavior of Crystalline Solid by n_aProceedings (Author) | |
 |
Solid 14KT White GOLD Crystalline Gem CZ SOLITAIRE Barbell Tongue Ring by Body Candy 14 Gauge (1.6mm), 5/8 Inches Length (16 mm), Solid 14kt Gold, 5mm balls 14 Gauge (1.6mm), 5/8 Inches Length (16 mm), Solid 14kt Gold, 5mm balls |
 |
Physical Chemistry of Solid: Basic Principles of Symmetry and Steability of Crystalline Solids (Advanced Series in Physical Chemistry, Vol 1) by H. Franzen (Author) This text covers the underlying principles of symmetry, thermodynamics and electronic structure that pertain to crystalline solids. These major notions of group theory should be useful for a clear understanding of fundamental concepts like x-ray diffraction and simple band theory. |
|
Internal Friction of Structural Defects in Crystalline Solids by R De Batist (Author) | |
 |
Solid 14KT White Gold Crystalline Gem STAR Nose Stud by Body Candy Genuine Cubic Zirconia SOLITAIRE Nose Ring Prong Set in 14KT Gold. A solid gold nose ring is always the perfect finishing touch; and this 3mm Cubic Zirconia nose ring will definitely catch an eye or two. 20 Gauge (.8 mm), 1/4 Inches (6mm), Solid 14KT Gold, 3mm Genuine Cubic Zirconia Solitaire (prong set) |
|
Crystalline and Non-Crystalline Solids (His Treatise on Solid State Chemistry; V. 3) by N. Hannay (Editor) |
| © 2009 BrightSurf.com |