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Latest Grain boundary Stories

New research Shows 'Perfect Twin Boundaries' Are Not So Perfect
2013-05-20 10:55:02

University of Vermont One of the basic principles of nanotechnology is that when you make things extremely small–one nanometer is about five atoms wide, 100,000 times smaller than the diameter of a human hair–they are going to become more perfect. "Perfect in the sense that their arrangement of atoms in the real world will become more like an idealized model," says University of Vermont engineer Frederic Sansoz, "with smaller crystals–in for example, gold or...

2012-12-17 14:24:54

Rice University theory predicts formation of conductive sub-nano ℠wires´ in two-dimensional materials A new material structure predicted at Rice University offers the tantalizing possibility of a signal path smaller than the nanowires for advanced electronics now under development at Rice and elsewhere. Theoretical physicist Boris Yakobson and postdoctoral fellow Xiaolong Zou were investigating the atomic-scale properties of two-dimensional materials when they found to their...

2010-11-12 01:42:59

The website of the Nobel Prize shows a cat resting in a graphene hammock. Although fictitious, the image captures the excitement around graphene, which, at one atom thick, is the among the thinnest and strongest materials ever produced. A significant obstacle to realizing graphene's potential lies in creating a surface large enough to support a theoretical sleeping cat. For now, material scientists stitch individual graphene sheets together to create sheets that are large enough to...

2010-03-26 09:04:15

"ËœLoading-unloading' effect of grain boundaries key to repair of irradiated metal Self-repairing materials within nuclear reactors may one day become a reality as a result of research by Los Alamos National Laboratory scientists. In a paper appearing yesterday in the journal Science, Los Alamos researchers report a surprising mechanism that allows nanocrystalline materials to heal themselves after suffering radiation-induced damage. Nanocrystalline materials are those created from...

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2010-02-23 16:00:00

Johns Hopkins researchers have discovered that, under the right conditions, newly developed nanocrystalline materials exhibit surprising activity in the tiny spaces between the geometric clusters of atoms called nanocrystals from which they are made. This finding, detailed recently in the journal Science, is important because these nanomaterials are becoming more ubiquitous in the fabrication of microdevices and integrated circuits. Movement in the atomic realm can affect the mechanical...

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2009-06-17 14:40:00

Researchers at the National Institute of Standards and Technology (NIST) have discovered that a reduction in mechanical strain at the boundaries of crystal grains can significantly improve the performance of high-temperature superconductors (HTS). Their results* could lead to lower cost and significantly improved performance of superconductors in a wide variety of applications, such as power transmission, power grid reliability and advanced physics research.One of the main challenges in...

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2009-06-17 13:15:00

Better predictions of how many valuable materials behave under stress could be on the way from the National Institute of Standards and Technology (NIST), where scientists have recently found evidence* of an important similarity between the behavior of polycrystalline materials"”such as metals and ceramics"”and glasses.Most metals and ceramics used in manufacturing are polycrystals. The steel in a bridge girder is formed from innumerable tiny metal crystals that grew together in a...

2008-10-07 03:00:18

By Zhang, X Anderoglu, O; Hoagland, R G; Misra, A This article reviews recent studies on the mechanical properties of sputtered copper and 330 stainless-steel films with {111} nanoscale growth twins preferentially oriented perpendicular to growth direction. The mechanisms of formation of growth twins during sputtering, unusually high strengths, and excellent thermal stability of nanotwinned structures are highlighted. INTRODUCTION Twin interfaces, which are low-energy planar defects, can...


Word of the Day
cruet
  • A vial or small glass bottle, especially one for holding vinegar, oil, etc.; a caster for liquids.
This word is Middle English in origin, and ultimately comes from the Old French, diminutive of 'crue,' flask.
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