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Engineers show how 'perfect' materials begin to fail at the nanoscale

Crystalline materials have atoms that are neatly lined up in a repeating pattern. When they break, that failure tends to start at a defect, or a place where the pattern is disrupted. But how do defect-free materials break? Until recently, the question was purely theoretical; making a defect-free material was impossible. Now that nanotechnological advances have made such materials a reality, however, researchers have shown how these defects first form on the road to failure.

Posted: Jun 4th, 2015

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Cost-effective risk assessment of nanomaterials may be feasible

The Dutch National Institute for Public Health and the Environment has commissioned the development of a strategy to evaluate the potential for read-across in cases of missing data for nanomaterials, with a focus on fulfilling data requirements in regulatory frameworks.

Posted: Jun 4th, 2015

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How to cut a vortex into slices

A group of physicists came up with a way to stir up a liquid in the microchannel. Physicists managed to find a sophisticated solution to the problem based on the use of superhydrophobic surfaces.

Posted: Jun 3rd, 2015

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Nano-spirals could guard against identity theft

Take gold spirals about the size of a dime and shrink them down about six million times. The result is the world's smallest continuous spirals: 'nano-spirals' with unique optical properties that would be almost impossible to counterfeit if they were added to identity cards, currency and other important objects.

Posted: Jun 3rd, 2015

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Surface-modified nanoparticles endow coatings with combined properties

Depending on which property is desired, the nanoparticles used can be surface modified with organic moieties. Small Molecule Surface Modification (SMSM) bestows specific combinations of desired properties, for example hydrophilic, hydrophobic, adhesive, anti-adhesive, acidic, basic, inert or polymerizable.

Posted: Jun 3rd, 2015

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Transient melting of a nanocrystal: seeing is believing

Scientists have discovered a spectacular transient melting phenomenon in nanocrystals. Coherent X-ray diffraction experiments have allowed snapshot imaging of a single 300 nm gold nanocrystal in the picosecond time interval after the particle was excited with a laser. The crystal was found to expand uniformly following the excitation and to reach the melting point about 50 ps later.

Posted: Jun 3rd, 2015

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New composite protects from corrosion at high mechanical stress

Material researchers will be presenting a composite material which prevents metal corrosion in an environmentally friendly way, even under extreme conditions. It can be used wherever metals are exposed to severe weather conditions, aggressive gases, media containing salt, heavy wear or high pressures.

Posted: Jun 3rd, 2015

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