Saturday, July 22, 2017

Name that scotch: Colorimetric recognition of aldehydes and ketones

Vodka tastes different from brandy, and connoisseurs can distinguish among different brands of whiskeys. The flavors of spirits result from a complex bouquet of volatile compounds. New colorimetric sensor arrays on disposable test-strips read by hand-held devices allow for their rapid, inexpensive, and sensitive identification by their chemical 'fingerprints'. They are based on novel sensor arrays that detect and differentiate among a diverse range of aldehydes and ketones.

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Friday, July 21, 2017

High-tech sensing illuminates concrete stress testing

Using the principles of light, scientists have discovered a new way to measure the strength of modern forms of concrete -- giving industry a better way to understand when it could fracture.

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Kaleidoscope of colors reveals complex biological processes

Researchers have developed a technique that uses the vibration of chemical bonds to produce specific colors that allow them to simultaneously observe, in cells and tissues, as many as 24 interacting molecules -- each with a distinct color.

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Sparkling springs aid quest for underground heat energy sources

Studies of naturally carbonated mineral water have given scientists insight on how to locate hot water springs -- potential sources of sustainable geothermal energy.

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Holographic imaging could be used to detect signs of life in space

Engineers say a method called digital holographic microscopy could be used to detect living microbes in space.

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Thursday, July 20, 2017

3-D imaging of surface chemistry in confinement

An optical imaging tool has been developed to visualize surface chemistry in real time. Researchers imaged the interfacial chemistry in the microscopically confined geometry of a simple glass micro-capillary. The glass is covered with hydroxyl (-OH) groups that can lose a proton -- a much-studied chemical reaction that is important in geology, chemistry and technology. A 100-micron long capillary displayed a remarkable spread in surface OH bond dissociation constant of a factor of a billion.

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Molecular 'pulleys' improve battery performance

Scientists have reported a molecular pulley binder for high-capacity silicon anodes of lithium ion batteries.

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