Navigation Links
Rainbows without pigments offer new defense against fraud
Date:5/18/2011

Scientists from the University of Sheffield have developed pigment-free, intensely coloured polymer materials, which could provide new, anti-counterfeit devices on passports or banknotes due to their difficulty to copy.

The polymers do not use pigments but instead exhibit intense colour due to their structure, similar to the way nature creates colour for beetle shells and butterfly wings.

These colours were created by highly ordered polymer layers, which the researchers produced using block copoylmers (an alloy of two different polymers). By mixing block copolymers together, the researchers were able to create any colour in the rainbow from two non-coloured solutions.

This type of polymer then automatically organises itself into a layered structure, causing optical effects similar to opals. The colour also changes depending on the viewing angle. This system has huge advantage in terms of cost, processing and colour selection compared to existing systems.

The complexity of the chemistry involved in making the polymer means they are very difficult for fraudsters to copy, making them ideally suited for use on passports or banknotes.

The academics used Diamond Light Source, the UK's national synchrotron science facility in Oxfordshire, to probe the ordered, layered structures using high power X-rays. This helped them understand how the colours were formed, and how to improve the appearance.

Dr Andrew Parnell, from the University of Sheffield's Department of Physics and Astronomy, said: "Our aim was to mimic the wonderful and funky coloured patterns found in nature, such as Peacock feathers. We now have a painter's palette of colours that we can choose from using just two polymers to do this. We think that these materials have huge potential to be used commercially."

Professor Nick Terrill, Principal Beamline Scientist for I22, the Diamond laboratory used for the experiment, explained: "Small Angle X-ray Scattering is a simple technique that in this case has provided valuable confirmatory information. By using Diamond's X-rays to confirm the structure of the polymer, the group was able to identify the appropriate blends for the colours required, meaning they can now tailor the polymer composition accordingly."


'/>"/>

Contact: Shemina Davis
shemina.davis@sheffield.ac.uk
44-114-222-5339
University of Sheffield
Source:Eurekalert  

Related biology news :

1. Fructose sets table for weight gain without warning
2. Disabling enzyme allows mice to gorge without becoming obese, new study finds
3. Crib-side studies help struggling newborns go home without feeding tubes
4. Sudden cardiac death without recognizable cause
5. New simulation shows consequences of a world without Earths natural sunscreen
6. Montana State grads work helps diagnose skin cancer without a biopsy
7. Nanofarming technology harvest biofuel oils without harming algae
8. Researchers create freestanding nanoparticle films without fillers
9. Molecular typesetting -- proofreading without a proofreader
10. Study finds DNA barcoding requires caution without closer examination
11. Reading the brain without poking it
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Rainbows without pigments offer new defense against fraud
(Date:6/9/2016)... TURKU, Finland , June 9, 2016 ... French National Police deploy Teleste,s video security solution to ensure ... France during the major tournament ... and data communications systems and services, announced today that its ... Police Prefecture to back up public safety across ...
(Date:6/2/2016)... , June 2, 2016 The ... has awarded the 44 million US Dollar project, for ... Embossed Vehicle Plates including Personalization, Enrolment, and IT Infrastructure ... leader in the production and implementation of Identity Management Solutions. ... January, however Decatur was selected for ...
(Date:6/1/2016)... Favorable Government Initiatives Coupled With ... Identification to Boost Global Biometrics System Market Through 2021  ... report, " Global Biometrics Market By Type, By ... 2011 - 2021", the global biometrics market is projected ... of growing security concerns across various end use sectors ...
Breaking Biology News(10 mins):
(Date:12/5/2016)... YORK , December 5, 2016 ... player worldwide, with almost $108 billion of revenue and ... $170 billion were spent on global biopharmaceuticals, and this ... This morning, Stock-Callers.com has lined up these four equities ... ), ACADIA Pharmaceuticals Inc. (NASDAQ: ACAD ), ...
(Date:12/4/2016)... ... December 03, 2016 , ... Microbial genomics ... impact grant award has been made to Dr. Renato Polimanti of Yale University ... on the oral microbiome. Grant proposals have been vetted by the company’s scientific ...
(Date:12/4/2016)... Mass. and CAMBRIDGE, Mass. ... Africa , Dec. 4, 2016 ... providing connected diagnostics software platforms for the developing ... making "Anywhere. Care.™" a reality with its portable ... have entered into a development and license agreement ...
(Date:12/2/2016)... 2, 2016 More than $4.3 million was raised ... ( DHMD ). The gala was held at the American ... City and honored Alan Alda and ... health and medicine and the public understanding of science. Since ... the event has raised $40 million for the Laboratory,s research ...
Breaking Biology Technology: