Top Page | English | 简体中文 | 繁體中文 | 한국어
Thursday, 7 February 2013, 19:30 HKT

Source: National Institute for Materials Science
Gold squeezed into micro-Velcro

Gold Squeezed into Micro-Velcro
Tsukuba, Japan (2/7) - SEM micrographs showing a variety of Au microwire morphologies depending on the overall Au content: a) Short and straight wires appear at 42 at.% Au. b) With increasing Au content to 44 at.% the wires become longer and start bending. c) They achieve a maximum length and a hook-like shape at 48 at.% Au. d) False-color picture generated from elemental composition maps for 46 at.% Au (Au: yellow, W: blue).

Tsukuba, Japan, Feb 7, 2013 - (ACN Newswire) - Velcro consists of one surface with loops, and another with hooks that latch onto the loops, joining opposing surfaces strongly. A miniaturised version of Velcro could be used in micro- and nanotechnology, but to form the surfaces, microwires are needed with properties that provide strength and durability.

Several different approaches have been used to construct 'micro-Velcro', but the most promising are those that use self-assembling or self-organising techniques, where microwires are 'squeezed' from a composite material by compression. Researchers at Ruhr University Bochum, Germany, have used this technique to produce gold microwires that have suitable properties for micro-Velcro.

The scientists created thin films of composite materials containing gold and tungsten metal. These were then heated to very high temperatures, causing the tungsten to react with oxygen and form tungsten oxide. This increased the volume of the tungsten and caused compression within the composite, 'squeezing' the softer gold out as 'whiskers'.

Different ratios of gold to tungsten were tried in the original composite, and these were heated to different temperatures and for different times to find the optimal conditions. The best result produced gold microwires approximately 35 micrometres long - similar to the width of a human hair - and 2 micrometres in diameter.

The resulting gold microwires have larger diameters than indium metal microwires that had previously been made using a similar technique, making them more suitable for micro Velcro. The results demonstrate that this new approach is a feasible one for producing the microwires that could be used to make micro-Velcro.

This research was published in the journal, Science and Technology of Advanced Materials.

Related information
[1] Synthesis of Au microwires by selective oxidation of Au-W thin-film composition spreads.
S. Hamann et al. Sci Technol. Adv. Mater. Vol. 14 (2013) p. 015003.

Media contacts:
Mikiko Tanifuji
National Institute for Materials Science, Tsukuba, Japan
Tel. +81-29-859-2494

Press release distributed by ResearchSEA for National Institute for Materials Science.

Feb 7, 2013
Topic: Research and development
Sectors: Science & Research
From the Asia Corporate News Network

Copyright © 2015 ACN Newswire. All rights reserved. A division of Asia Corporate News Network.

 ACN Search:
National Institute for Materials Science
Feb 19, 2015
Controlling Car Pollution at the Quantum Level
Jan 30, 2015
Understanding the reinforcing ability of carbon nanotubes
Jan 23, 2015
Improvements in Transistors Will Make Flexible Plastic Computers a Reality
Aug 15, 2014
Carbon Nanotubes and Near-infrared Lasers Promise a Cost Effective Solution for Cell Membrane Manipulation
Mar 6, 2014
Recent advances in the controlled synthesis and functional applications of luminescent metal nanoclusters
Jan 8, 2014
Magneto-optical Nonreciprocal Devices in Silicon Photonics
Oct 3, 2013
A Rapid, Paper-based Diagnostic Test for Tuberculosis
Oct 3, 2013
Improving the Performance of Titanium Implants by Bioactive Composite Coatings
June 27, 2013
Can Silver Promote the Colonization of Bacteria on Medical Devices?
Feb 7, 2013
Fluorescent label sheds light on radioactive contamination
More news >>
 News Alerts
Copyright © 2015 ACN Newswire - Asia Corporate News Network
Home | About us | Services | Partners | Events | Login | Contact us | Privacy Policy | Terms of Use | RSS
US: +1 800 291 0906 | Beijing: +86 10 8405 3688 | Hong Kong: +852 2217 2912 | Singapore: +65 6304 8926 | Tokyo: +81 3 5791 1818

Connect With us: