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:2/5/2016)... , Feb. 5, 2016 Australian-US drug discovery ... announced today the appointment of a new Chairman, Mr ... Carmine , effective immediately. James Garner , ... Executive Director and former Acting CEO, Mr Iain Ross ... Non-Executive Director. --> James Garner , has also ...
(Date:2/4/2016)... Falls Church, VA (PRWEB) , ... ... ... a first-year cybersecurity conference presented by Bloomsburg University’s Digital Forensics Club, takes ... Bloomsburg, PA. The two-day event features 20+ speakers and activities such as ...
(Date:2/4/2016)... ContraVir Pharmaceuticals, Inc. (NASDAQ: CTRV ), ... of targeted antiviral therapies, announced today that it will ... be held February 8-9, 2016, at the Waldorf Astoria ... & Healthcare Conference, taking place in New ... James Sapirstein , Chief Executive Officer of ContraVir, will ...
(Date:2/4/2016)... ... , ... Many of the engineers at FireflySci, Inc. have been manufacturing quartz ... from other cuvette manufacturers is their supercharged customer service and their extensive database of ... steady flow of inside information, they have recently revamped their manufacturing techniques to reduce ...
Breaking Biology Technology:
(Date:2/3/2016)... , Feb. 3, 2016 ... the addition of the "Emotion Detection ... Machine Learning, and Others), Software Tools (Facial ... Areas, End Users,and Regions - Global forecast ... --> http://www.researchandmarkets.com/research/d8zjcd/emotion_detection ) has ...
(Date:2/2/2016)... 2, 2016   Parabon NanoLabs (Parabon) ... Army Research Office and the Defense Forensics and ... of the company,s Snapshot Kinship Inference ... more generally, defense-related DNA forensics.  Although Snapshot is ... appearance and ancestry from DNA evidence), it also ...
(Date:1/28/2016)... Jan. 28, 2016 Synaptics (NASDAQ: SYNA ), a ... its second quarter ended December 31, 2015. ... of fiscal 2016 increased 2 percent compared to the comparable quarter ... of fiscal 2016 was $35.0 million, or $0.93 per diluted share. ... income for the first quarter of fiscal 2016 grew 9 percent ...
Breaking Biology News(10 mins):