Featured Research

from universities, journals, and other organizations

Nano Wagon Wheels

Date:
July 8, 2007
Source:
John Wiley & Sons, Inc.
Summary:
Sigurd Hoeger and team have synthesized molecules that look like tiny wagon wheels for use in nanocomposite materials such as food packaging.

They looks like a tiny wagon wheels: Scanning tunneling microscope images depict giant molecules with a diameter of 7 nm, whose "hub", "spokes", and "rim" are clearly recognizable.
Credit: Copyright Angewandte Chemie, Wiley-VCH

Sigurd Hoeger and his team have synthesized molecules that look like tiny wagon wheels for use in nanocomposite materials such as food packaging.

Related Articles


It looks like a tiny wagon wheel: Scanning tunneling microscope images published in the journal Angewandte Chemie depict giant molecules with a diameter of 7 nm, whose “hub”, “spokes”, and “rim” are clearly recognizable. This unusual, highly symmetric structure was made by a team led by Sigurd Hφger (University of Bonn).

Two-dimensional particles, such as inorganic alumina platelets, are used as fillers for plastics because they impart excellent mechanical properties to these materials. Nanocomposites made of alumina platelets and polymers are thus extraordinarily rigid, strong, and thermally stable materials. The barrier properties of plastics with respect to liquids and gasses, such as oxygen, could be improved by the addition of nanoscopic platelets. This would be useful for applications such as food packaging, and makes less expensive, more environmentally friendly plastics accessible.

To better understand the way in which the platelets work, several researchers have been working with synthetic alumina platelets. One area of interest is the use of large organic molecules in the form of rigid disks. Their advantage: They can be produced with uniform shapes and sizes. Also, their chemical properties can be adjusted as needed by the attachment of additional functional groups. Until now, organic molecular disks could not be made as large as the inorganic originals they are intended to imitate. The team from the Universities of Bonn and Leuven has now jumped this hurdle: They have successfully synthesized very large wheel-shaped molecules.

Starting from a rigid, star-shaped “hub”, the researchers added additional rigid molecular building blocks to form six “spokes”. Finally, the parts of the molecule were connected to form a continuous “rim”. The rigid linear molecules used contain aromatic six-membered rings as well as carbon–carbon triple bonds. Additional groups attached to the spokes provide the solubility required for the experiments to be carried out on these molecules.

In the next step, the researchers will attempt to grow these little wheels bit by bit by adding more building blocks onto the rim. This should result in structures resembling a spider web.


Story Source:

The above story is based on materials provided by John Wiley & Sons, Inc.. Note: Materials may be edited for content and length.


Cite This Page:

John Wiley & Sons, Inc.. "Nano Wagon Wheels." ScienceDaily. ScienceDaily, 8 July 2007. <www.sciencedaily.com/releases/2007/07/070706115115.htm>.
John Wiley & Sons, Inc.. (2007, July 8). Nano Wagon Wheels. ScienceDaily. Retrieved November 23, 2014 from www.sciencedaily.com/releases/2007/07/070706115115.htm
John Wiley & Sons, Inc.. "Nano Wagon Wheels." ScienceDaily. www.sciencedaily.com/releases/2007/07/070706115115.htm (accessed November 23, 2014).

Share This


More From ScienceDaily



More Matter & Energy News

Sunday, November 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Toyota's Hydrogen Fuel-Cell Green Car Soon Available in the US

Toyota's Hydrogen Fuel-Cell Green Car Soon Available in the US

AFP (Nov. 21, 2014) — Toyota presented its hydrogen fuel-cell compact car called "Mirai" to US consumers at the Los Angeles auto show. The car should go on sale in 2015 for around $60.000. It combines stored hydrogen with oxygen to generate its own power. Duration: 01:18 Video provided by AFP
Powered by NewsLook.com
Google Announces Improvements To Balloon-Borne Wi-Fi Project

Google Announces Improvements To Balloon-Borne Wi-Fi Project

Newsy (Nov. 21, 2014) — In a blog post, Google said its balloons have traveled 3 million kilometers since the start of Project Loon. Video provided by Newsy
Powered by NewsLook.com
Raw: Paralyzed Marine Walks With Robotic Braces

Raw: Paralyzed Marine Walks With Robotic Braces

AP (Nov. 21, 2014) — Marine Corps officials say a special operations officer left paralyzed by a sniper's bullet in Afghanistan walked using robotic leg braces in a ceremony to award him a Bronze Star. (Nov. 21) Video provided by AP
Powered by NewsLook.com
British 'Bio-Bus' Is Powered By Human Waste

British 'Bio-Bus' Is Powered By Human Waste

Buzz60 (Nov. 21, 2014) — British company GENeco debuted what its calling the Bio-Bus, a bus fueled entirely by biomethane gas produced from food scraps and sewage. Jen Markham explains. Video provided by Buzz60
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins