Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Another nanobrick in the wall

17.12.2001


Nanocubes could make polymer chemistry child’s play
© PhotoDisc


Chemists make the world’s smallest building blocks.

US researchers have made the world’s smallest building blocks. The nanocubes are just a millionth of a millimetre (a nanometre) across1. Stacked like bricks, they could make up a range of materials with useful properties such as light emission or electrical conduction.

Many chemists are currently trying to develop molecular-scale construction kits in which the individual components are single molecules to provide the polymers of the future. Conventional polymers are chainlike molecules. These entangle to form plastics ranging from soft polyethylene to hard polystyrene.



Chemists can exert some influence over the properties of the bulk plastic by altering the shape and composition of the molecular chains. But they have little control over how the chains weave together.

Richard Laine and colleagues at the University of Michigan in Ann Arbor want to replace chains with bricks. Their molecular units are silicon and oxygen atoms linked into a cube-shaped framework with a silicon at each corner.

The researchers connect the cubes by their corners - each corner silicon has a ’spare’ bond to which other chemical groups can be attached.

Similar materials have been prepared previously using corner linkers made from chainlike hydrocarbons. Like cubic octupi with eight arms, these are of limited practical value because they decompose quite easily when heated, and form messy glass-like solids instead of well-ordered crystals with the cubes stacked precisely.

Laine’s team address this problem by replacing the loose, chain-like linker arms with stiff, stubby arms: compact aromatic molecules derived from benzene. These should make the resulting materials more stable and rigid.

For example, the nanocubes make a curable resin that can withstand heating above 500 oC in air. And by appending different molecular groups to the short benzene-like arms, the researchers have made a material that conducts electricity, which might be used in polymer-based light-emitting diodes for display devices. A third kind of cubic molecule emits green light and could be useful in sensors and displays.

References

  1. Tamaki, R., Tamaki, Y., Asuncion, M. Z., Choi, J. & Laine, R. M. Octa(aminophenyl)silsesquioxane as a nanoconstruction site. Journal of the American Chemical Society, 123, 12416 - 12417, (2001).

PHILIP BALL | © Nature News Service
Further information:
http://www.nature.com/nsu/011220/011220-6.html

More articles from Life Sciences:

nachricht Flow of cerebrospinal fluid regulates neural stem cell division
22.05.2018 | Helmholtz Zentrum München - Deutsches Forschungszentrum für Gesundheit und Umwelt

nachricht Chemists at FAU successfully demonstrate imine hydrogenation with inexpensive main group metal
22.05.2018 | Friedrich-Alexander-Universität Erlangen-Nürnberg

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

Im Focus: Dozens of binaries from Milky Way's globular clusters could be detectable by LISA

Next-generation gravitational wave detector in space will complement LIGO on Earth

The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...

Im Focus: Entangled atoms shine in unison

A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.

The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...

Im Focus: Computer-Designed Customized Regenerative Heart Valves

Cardiovascular tissue engineering aims to treat heart disease with prostheses that grow and regenerate. Now, researchers from the University of Zurich, the Technical University Eindhoven and the Charité Berlin have successfully implanted regenerative heart valves, designed with the aid of computer simulations, into sheep for the first time.

Producing living tissue or organs based on human cells is one of the main research fields in regenerative medicine. Tissue engineering, which involves growing...

Im Focus: Light-induced superconductivity under high pressure

A team of scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg investigated optically-induced superconductivity in the alkali-doped fulleride K3C60under high external pressures. This study allowed, on one hand, to uniquely assess the nature of the transient state as a superconducting phase. In addition, it unveiled the possibility to induce superconductivity in K3C60 at temperatures far above the -170 degrees Celsius hypothesized previously, and rather all the way to room temperature. The paper by Cantaluppi et al has been published in Nature Physics.

Unlike ordinary metals, superconductors have the unique capability of transporting electrical currents without any loss. Nowadays, their technological...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

 
Latest News

Supersonic waves may help electronics beat the heat

18.05.2018 | Power and Electrical Engineering

Keeping a Close Eye on Ice Loss

18.05.2018 | Information Technology

CrowdWater: An App for Flood Research

18.05.2018 | Information Technology

VideoLinks
Science & Research
Overview of more VideoLinks >>>