Latest chemical bond Stories
As electronic circuits shrink from finely etched lines in silicon wafers to nearly elusive proportions, researchers at the U.S. Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab) and Columbia University are studying how electrons flow through a molecular junction-a nanometer scale circuit element that contacts gold atoms with a single molecule. Their findings reveal the electrical resistance through this junction can be turned "˜on' and "˜off' simply by pushing and...
New phase of elemental boron discoveredZurich/New York, January 29, 2009. An ETH Zurich researcher has developed a computational method for predicting the structure of materials. He used it to solve the structure of a newly synthesized form of pure boron that displays some unusual physical properties and brings a surprise: it is partially ionic.The new structure can be viewed as a NaCl-type structure, with anionic and cationic positions occupied by two different clusters of boron atoms (B12...
Common sense tells us that when you heat something up it gets softer, but a team of researchers, led by University of Toronto chemistry and physics professor R.J. Dwayne Miller, has demonstrated the exact opposite. Their findings will be published online in the prestigious international journal Science on January 22."It is counter-intuitive but the gold got harder instead of softer," says Miller. Can you imagine a blacksmith heating up gold to pound it thinner, only to find it...
Researcher Kristina Djanashvili has developed a substance that enables doctors to get better MRI scans of tumours. On Tuesday 13 January, Djanashvili will be awarded a doctorate by TU Delft for her work in this field.The medical profession's ability to trace and visualise tumours is increasing all the time. Detection and imaging techniques have improved enormously in recent years. One of the techniques that have come on by leaps and bounds is MRI. Patients who are going to have MRI scans are...
By Castelvecchi, Davide Bond lengths are different in heavy, light water molecules Heavy water is not just heavier. Swapping each H in H2O with a D- hydrogen's isotope deuterium - changes water's properties. The deuterium version is mildly poisonous, and its freezing point is 4[degrees] Celsius, instead of 0[degrees]C Such differences reveal that quantum effects, which aren't usually manifest to the naked eye, rule in ordinary water, researchers suggest. Alan Soper of the Rutherford...
Researchers have discovered an unusual molecule that is essential to the atmosphere's ability to break down pollutants, especially the compounds that cause acid rain.It's the unusual chemistry facilitated by this molecule, however, that will attract the most attention from scientists.Marsha Lester, the University of Pennsylvania's Edmund J. Kahn Distinguished Professor, and Joseph Francisco, William E. Moore Distinguished Professor of Chemistry at Purdue University, found the molecule, which...
By Peng, J Z Yang, X Z; Zhou, F C; Gray, M F According to the average lattice and atom model of the empirical electron theory (EET) of solids and molecules, effects of interstitial impurities on valence electron structures (VESs) and phase transformation of Ti-Al alloys are analysed. In particular, melting points or allotropic transformation in Ti-Al phase diagram affected by interstitial impurities are calculated using the bond energy formula of the EET. It is demonstrated that because of...
A new rubber-like material created with the ability to "heal" itself is paving the way for the development of a wide variety of new products.Polymer chemist Ludwik Leibler developed the "supramolecular rubber" with his colleagues at the Industrial Physics and Chemistry Higher Educational Institution (ESPCI) in Paris, France.When light pressure is applied to the fractured pieces of rubber at room temperature, they form a hydrogen bond and about 15 minutes later become one piece that is just as...
Research and Markets (http://www.researchandmarkets.com/reports/c81890) has announced the addition of "The Chemical Bond in Inorganic Chemistry: The Bond Valence Model" to their offering. The bond valence model is a recently developed model of the chemical bond in inorganic chemistry that complements the bond model widely used in organic chemistry. It is simple, quantitative, intuitive, and predictive - no more than a pocket calculator is needed to calculate it. This book focuses on...
