Subscribe to our free daily newsletters
. 24/7 Space News .




Subscribe to our free daily newsletters



TECH SPACE
When gold turns invisible
by Staff Writers
Sapporo, Japan (SPX) Jun 01, 2017


9-anthryl gold(I) isocyanide (3a) turns invisible and emits infrared after it's ground whereas phenyl gold(I) isocyanide (1) turns yellow. Credit Seki T. et al., Journal of the American Chemical Society, May 2, 2017

A gold compound shifts from a visible fluorescence to emitting infrared when ground - a big shift with potential applications in bioimaging and security inks.

Some materials luminesce, changing their color and intensity when under mechanical forces such as grinding or rubbing. These luminescent "mechanochromic" materials can produce various emission colors in the visible light spectrum, from blue to red. Their color-shifts under force are well documented, and are caused by changes to the molecules' crystal structures.

Recently, a big shift from the visible spectrum to the infrared has been identified and described in the Journal of the American Chemical Society. Such a large change is unprecedented and is exciting because of its potential applications for bioimaging and invisible inks.

In an attempt to develop new mechanochromic compounds, a research group at Hokkaido University in Japan found a gold compound called 9-anthryl gold(I) isocyanide complex has a unique feature.

In its original form, the substance produced a visible blue fluorescence with a wavelength of 448 nanometres (nm). After being ground up into a fine powder, the substance produced infrared emissions (phospholescence) with a wavelength of 900 nm. The infrared emissions are invisible to the naked eye.

"This is the first time a material has been reported to make such a dramatic shift - a change of 452 nm - that also reaches into the infrared part of the light spectrum," says Tomohiro Seki, the lead and corresponding author of the paper.

The research group's X-ray crystallographic analyses revealed that the large shift is based on a crystalline-to-amorphous phase transition which should create strong intermolecular interactions between the gold ions.

"The development of infrared emissive materials is generally difficult, and appropriate design strategies remain limited. However, in this case, simple grinding can afford an infrared emissive material," says Hajime Ito, the corresponding author.

"Infrared is invisible to the naked eye but detectable using a spectrometer. So, our material has a great potential for bioimaging and security inks."

Research paper

TECH SPACE
High pressure key to lighter, stronger metal alloys, Stanford scientists find
Stanford CA (SPX) May 31, 2017
High pressure could be the key to making advanced metal mixtures that are lighter, stronger and more heat-resistant than conventional alloys, a new study by Stanford researchers suggests. Humans have been blending metals together to create alloys with unique properties for thousands of years. But traditional alloys typically consist of one or two dominant metals with a pinch of other metal ... read more

Related Links
Hokkaido University
Space Technology News - Applications and Research


Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only

Comment using your Disqus, Facebook, Google or Twitter login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

TECH SPACE
Astronauts return after marathon ISS mission

From 2D to 3D, Space Station Microscope Gets an Upgrade

Studying Flame Behavior in Microgravity with a Solid "High-Five"

NASA honors Kennedy's space vision on 100th birthday

TECH SPACE
SpaceX blasts off cargo using recycled spaceship

Ariane 5 launches its heaviest telecom payload

Eutelsat signs new launch contract with Arianespace

Ariane 5 launches its first all-electric satellite

TECH SPACE
Halos discovered on Mars widen time frame for potential life

Curiosity Peels Back Layers on Ancient Martian Lake

Student-Made Mars Rover Concepts Lift Off

Illinois Company Among Hundreds Supporting NASA Mission to Mars

TECH SPACE
California Woman Charged for Trying to Hand Over Sensitive Space Tech to China

A cabin on the moon? China hones the lunar lifestyle

China tests 'Lunar Palace' as it eyes moon mission

China to conduct several manned space flights around 2020

TECH SPACE
Thomas Pesquet returns to Earth

Propose a course idea for the CU space minor

Leading Global Air And Space Law Group Joins Reed Smith

New Horizons for Alexander Gerst

TECH SPACE
When gold turns invisible

Mitsubishi Electric Completes New Satellite Component Production Facility

High pressure key to lighter, stronger metal alloys, Stanford scientists find

Northrop Grumman receives AESA radar contract

TECH SPACE
Giant Ringed Planet Likely Cause of Mysterious Eclipses

New Collaboration with Jodrell Bank Observatory for SETI

Viable Spores, DNA Fragments Discovery at ISS Justifies Biosphere's Expansion

Russia thinks microorganisms may be living outside the space station

TECH SPACE
A whole new Jupiter with first science results from Juno

First results from Juno show cyclones and massive magnetism

Jupiters complex transient auroras

NASA's Juno probe forces 'rethink' on Jupiter




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News






The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement