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:3/24/2017)... 2017 The Controller General of Immigration from Maldives ... Algeen have received the prestigious international IAIR Award for the most ... Reading ... Maldives ... Abdulla Algeen (small picture on the right) have received the IAIR award ...
(Date:3/23/2017)... The report "Gesture Recognition and Touchless Sensing Market by Technology (Touch-based and ... 2022", published by MarketsandMarkets, the market is expected to be worth USD 18.98 ... Continue Reading ... ...      ...
(Date:3/22/2017)... VILNIUS, Lithuania , March 21, 2017 /PRNewswire/ ... identification and object recognition technologies, today announced the ... development kit (SDK), which provides improved facial recognition ... safety cameras on a single computer. The new ... algorithms to improve accuracy, and it utilizes a ...
Breaking Biology News(10 mins):
(Date:9/21/2017)... ... September 21, 2017 , ... ... sector professionals, has announced the addition of 5 new courses to its prospectus. ... Compliance with Regulation 21 CFR Part 11 on Electronic Records and Electronic Signatures ...
(Date:9/21/2017)... ... September 21, 2017 , ... Lajollacooks4u welcomed the San Diego chapter of ... worldwide society of professional women with high achievement in the fields of food, fine ... , Twelve members began with an olive oil tasting to whet their palettes ...
(Date:9/20/2017)... ... September 20, 2017 , ... ... with Koch Agronomic Services (Koch) to feature new innovations aimed at helping farmers ... first quarter 2018. American Farmer airs Tuesdays at 8:30aET on RFD-TV. Check your ...
(Date:9/20/2017)... ... September 20, 2017 , ... Diversity focused business accelerator, ... the Growth pitch competition to uncover the top technology-driven, women-led startups in Boston, MA, ... part of each city’s entrepreneurial events going on that week – in Boston, it ...
Breaking Biology Technology: