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FY22 Budget Request: Department of Defense

Within a historically high budget request for the Department of Defense’s R&D programs, the Biden administration is proposing to pare back support for early-stage research. ....

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Why silver dissipates from gold-silver nanoparticles

The discovery could help fine-tune nanoparticle alloys for specific uses.
Gold-silver alloys are useful catalysts that degrade environmental pollutants, facilitate the production of plastics and chemicals, and kill bacteria on surfaces, among other applications. In nanoparticle form, these alloys could be useful as optical sensors or to catalyze hydrogen evolution reactions.
The team, from Rice University and the University of Duisburg-Essen in Germany, employed sophisticated microscopy to show how gold might retain enough silver to stabilize the nanoparticle. Their study appears in the journal
The researchers used a hyperspectral dark-field imaging microscope to study gold-silver alloy nanoparticles containing an excess of silver in an acidic solution. The technique allowed them to trigger plasmons, ripples of energy that flow across the surface of particles when lit. These plasmons scatter light that changes with the alloy’s composition. ....

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Silver Ions' Dispersion from Alloys Benefits Optical Sensors, Other Applications | Research & Technology | Apr 2021

Silver Ions' Dispersion from Alloys Benefits Optical Sensors, Other Applications | Research & Technology | Apr 2021
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New Discovery Could Help Fine-Tune Nanoparticle Alloys for Specific Uses

New Discovery Could Help Fine-Tune Nanoparticle Alloys for Specific Uses
Written by AZoNanoApr 23 2021
There s gold in them thar nanoparticles, and there used to be a lot of silver, too. But much of the silver has leached away, and researchers want to know how.
Gold-silver alloys are useful catalysts that degrade environmental pollutants, facilitate the production of plastics and chemicals and kill bacteria on surfaces, among other applications. In nanoparticle form, these alloys could be useful as optical sensors or to catalyze hydrogen evolution reactions.
But there s an issue: Silver doesn t always stay put.
A new study by scientists at Rice University and the University of Duisburg-Essen, Germany, reveals a two-step mechanism behind silver s dissipation, a discovery that could help industry fine-tune nanoparticle alloys for specific uses. ....

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Nanotechnology Now - Press Release: Silver ions hurry up, then wait as they disperse: Rice chemists show ions' staged release from gold-silver nanoparticles could be useful property

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Home > Press > Silver ions hurry up, then wait as they disperse: Rice chemists show ions staged release from gold-silver nanoparticles could be useful property
Chemists at Rice University and the University of Duisburg-Essen, Germany quantified the release of silver ions from gold-silver nanoparticle alloys. At top, transmission electron microscope images show the change in color as silver (in blue) leaches out of a nanoparticle over several hours, leaving gold atoms behind. The bottom hyperspectral images show how much a nanoparticle of silver and gold shrank over four hours as the silver leached away. (Credit: Rice University) ....

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