Decision time? Check out our latest product comparisons

Nanoscale anti-counterfeiting tech reveals hidden image when breathed upon

By

August 7, 2014

Breathing on a nanoscale-printed material reveals a hidden image of Marilyn Monroe

Breathing on a nanoscale-printed material reveals a hidden image of Marilyn Monroe

Image Gallery (6 images)

Allowing consumers to identify counterfeit goods is a tricky and expensive problem, as many security measures such as holograms might be easily mimicked by counterfeiters. A new nanoscale printing technique, however, allows researchers to create labels that reveal a "watermarked" image when breathed upon by the consumer. The labels are scalable and durable, and can be applied to many surfaces, yet are beyond the hands of those who might try to mimic them to fool consumers.

The research, from the University of Michigan and from South Korea, addresses some prior problems of creating polymer-based nanopillar arrays, or sheets of a material doped with nanometer-scaled towers. Though these materials could be useful in a variety of fields such as wearable electronics or solar cells, their construction has previously been undoable with cheap molding processes, because the material tends to stick to the template of tiny, nanometer-sized holes, rather than sticking to the intended substrate.

However, a new polymer blend of adhesive and a polyurethane not only allows the material to shrink and pull slightly away from the mold, but produces a stronger result that can stick to more types of materials (plastics, fabric, paper, and metal were tested). It also resists being rubbed away, as might happen during shipping. This was also a weakness with previous polymers.

A close-up of the polymer nanomaterial after the molding and printing processes
A close-up of the polymer nanomaterial after the molding and printing processes

To create the secret hidden image useful for counterfeit prevention, these sheets, currently moldable up to 8 in (20 cm) in diameter, are fed into something similar to an inkjet printer with smaller drops. Wherever the nanopillars are covered or the spaces between pillars are filled in, a hidden image is created. When the material is breathed on, the image appears like magic – in reality, the moisture in the breath condenses in the filled design.

The production method is so cost-effective that the researchers anticipate the molded labels could be produced at about US$1 per square inch, with manufacturers then using the deposition printers, already in use in some industries, to apply their own watermarked logo.

The research was funded by DARPA and the National Science Foundation, among others, and was originally published in the journal Advanced Materials.

In the video below, researchers Nicholas Kotov and Terry Shyu explain the technology and demonstrate the printing process.

Source: University of Michigan

About the Author
Heidi Hoopes Heidi measures her life with the motley things she's done in the name of scientific exploration. While formally educated in biology and chemistry, informally she learns from adventures and hobbies with her family. Her simple pleasures in life are finding turtles while jogging and obsessively winnowing through her genetic data.   All articles by Heidi Hoopes
4 Comments

Another new counterfeiting technique. Let's hope this one can last more than the traditional few weeks when implemented.

Lbrewer42
8th August, 2014 @ 09:10 am PDT

Mass produce for businesses alone IE fashion, tech, etc.

Stephen N Russell
8th August, 2014 @ 09:28 am PDT

.....when breathed on.........

Great, money is going to become an even dirtier medium for the spread of disease now.

flylowguy
8th August, 2014 @ 12:51 pm PDT

I agree FLYLOWGUY - Just what every teller/cashier/money changer with an infectious stage of a nasty virus needs, another way to inadvertantly or deliberately spread it to hundreds of unsuspecting victims.

The Skud
17th August, 2014 @ 06:38 pm PDT
Post a Comment

Login with your gizmag account:

Or Login with Facebook:


Related Articles
Looking for something? Search our 29,039 articles