Navigation Links
Gold and silver nano baubles
Date:12/3/2010

They might just be the smallest Christmas tree decorations ever. Tiny spherical particles of gold and silver that are more than 100 million times smaller than the gold and silver baubles used to decorate seasonal fir trees have been synthesized by researchers in Mexico and the US.

Writing in the December issue of the International Journal of Nanoparticles, materials engineer Xavier E. Guerrero-Dib, of the Universidad Autnoma de Nuevo Len and colleagues there and at The University of Texas at Austin, describe the formation of gold, silver and alloyed, bimetallic nanoparticles just 25 nanometers in diameter. They used vitamin C, ascorbic acid, commonly found in tangerines, a favorite stocking filler in many parts of the world, and a soap-like, surfactant molecule known as cetyltrimethylammonium bromide, an antiseptic occasionally used in expensive cosmetics.

Reaction of silver nitrate and the gold compound chloroauric acid under these conditions led to successive reduction of the metals and the formation of different silver, gold and bimetallic nanoparticles. The precise structures of the nanoparticles were revealed using a high-resolution elemental mapping technique. The analysis shows the nanoparticles to have multiple layers, shells of gold within silver within gold, in the case of the bimetallic particles and some blending, or alloying, of the metals occurred.

Nanoparticles are of great interest to chemists and materials scientists for their potential as catalysts for speeding up chemical reactions, as novel drug-delivery agents, and as quantum dots for analytical applications. They may also be used in the fabrication of the components of future electronics devices beyond the silicon chip. Metal nanoparticles containing two or more different metals might have even more intriguing chemical, electronic and optical properties than single-metal nanoparticles because of the combination of the different chemistries of each metal as well as the size effects of the particles simply being, very, very small.

The researchers point out that the optical properties of nanoparticles depend very much on size and shape as well as the constituent metals. Gold and silver nanoparticles are particularly useful as their optical effects occur at visible wavelengths of light. The team adds that if it were possible to fine-tune the combination of gold and silver in the same nanoparticles then it might also be possible to tune the optical properties of such particles.


'/>"/>

Contact: Xavier E. Guerrero-Dib
xavier.guerrerod@uvmnet.edu
52-818-121-4800
Inderscience Publishers
Source:Eurekalert

Related biology technology :

1. Nanoscale silver: No silver lining?
2. Massachusetts Company May Have Silver Bullet In Vitamin D Fight Against Disease
3. ULURU Inc. Announces the Filing of a 510k Submission With the FDA for Altrazeal(TM) Silver
4. Microban Signs Exclusive Agreement with Sharp Electronics to Launch Calculators with New Microban(R) 3G Silver(TM) Antimicrobial Technology
5. The toxicity of antimicrobial silver in products can be reduced
6. Haydon Kerk Motion Solutions Inspires Next Generation of Innovators as Silver Supplier of the FIRST Robotics Competition
7. Vital Therapies Expands SILVER Trial to Saudi Arabia
8. Sigma® Life Science Awarded Silver in Top Ten Innovations 2010
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/24/2017)... ... January 24, 2017 , ... Nanomedical Diagnostics ... for fragment-based screening, will showcase its proprietary Field Effect Biosensing (FEB) ... Screening (SLAS) conference in Washington, D.C. from Feb. 6 to Feb. 8. , ...
(Date:1/24/2017)... ... January 23, 2017 , ... Edward ... first-ever recipient of the National Academy of Sciences Prize in Food and Agriculture ... nutrition. , The annual National Academy of Sciences (NAS) Prize in Food and ...
(Date:1/24/2017)... , Jan. 23, 2017  Today, the Fisher Center ... have funded an important study that could lead to ... onset of Alzheimer,s disease. This groundbreaking research was conducted ... led by Nobel Laureate Dr. Paul Greengard , ... disease. Fisher Center scientists have linked a ...
(Date:1/23/2017)... - Resverlogix Corp. ("Resverlogix" or the "Company") (TSX: RVX) ... Zealand based Phase 1 trial with severe ... in reducing inflamed protein biomarkers in patients with severe ... that this is the first time in medical history ... made between epigenetic regulation and its potential for positive ...
Breaking Biology Technology:
(Date:1/4/2017)... VEGAS , Jan. 4, 2017  CES ... performance biometric sensor technology, today announced the launch ... sensor systems, the highly-accurate biometric sensor modules ... biometric technology, experience and expertise. The two ... Benchmark designed specifically for hearables, and Benchmark BW2.0, ...
(Date:12/20/2016)... N.C. and GENEVA, Dec, 20, 2016 /PRNewswire/ ... biometric data sensor technology, and STMicroelectronics ... the spectrum of electronics applications, announced today the ... development kit for biometric wearables that includes ST,s ... with Valencell,s Benchmark™ biometric sensor system. ...
(Date:12/15/2016)... , December 15, 2016 Arvato ... an agreement with NuData Security, an award-winning international ... will enable clients to focus on good customer experience, balancing ... regulation. ... In order to provide a one-stop fraud prevention suite, Arvato ...
Breaking Biology News(10 mins):