An Acid-Spewing ATM That Protects Itself From Thieves

How scientists turned a beetle's unusual defense mechanism into technology. 
More
A cash machine in downtown Rome. (Reuters)

Defense can be a messy business in the natural world. There are suicidal blast ants that explode, horror frogs that create makeshift claws out of their own broken bones, and bombardier beetles that spray near-boiling gas that's noxious enough to burn human skin. 

The elegance of the bombardier beetle's defense mechanism caught the attention of scientists in Switzerland, who designed anti-theft technology that works like the beetle's anatomy.

The beetle does its thing by storing two chemicals—hydrogen peroxide and hydroquinone—in separate abdominal chambers. When the chemicals mix, they create a reaction that heats and partially vaporizes the liquids. The resulting gas is what the beetle then sprays. It looks like this: 

Reuters

Skip ahead to the one-minute mark and check it out: 

Chemists at ETH Zurich University found a way to replicate this effect using two chemical-filled honeycomb structures. They filled the hollow spaces of one structure with hydrogen peroxide, and filled the hollow spaces of the other with manganese dioxide. Then, they separated the two structures with a thin lacquer that breaks pretty easily on impact. If the two chemicals mix, a reaction occurs. 

The scientists say their technology could be built into cash machines that would ooze hot foam when someone tampers with them, according to the university.

"Since the responsive materials presented here do not depend on electricity, they may provide a cost effective alternative to currently used safety systems in the public domain, automatic teller machines and protection of money transport systems," ETH researchers wrote in a Journal of Materials Chemistry paper.

But instead of burning potential thieves the way a beetle would spray a predator, scientists say their device would emit dye and DNA nanoparticles that would render stolen banknotes useless and mark them for tracking. 

 

Jump to comments
Presented by

Adrienne LaFrance

Adrienne LaFrance is a senior associate editor at The Atlantic, where she oversees the Technology Channel. Previously she worked as an investigative reporter for Honolulu Civil Beat, Nieman Journalism Lab, and WBURMore

Her writing has appeared in The New York Times, The Washington Post, Gawker, The Awl, and several other publications. 
Get Today's Top Stories in Your Inbox (preview)

CrossFit Versus Yoga: Choose a Side

How a workout becomes a social identity


Join the Discussion

After you comment, click Post. If you’re not already logged in you will be asked to log in or register. blog comments powered by Disqus

Video

CrossFit Versus Yoga: Choose a Side

How a workout becomes a social identity

Video

Is Technology Making Us Better Storytellers?

The minds behind House of Cards and The Moth weigh in.

Video

A Short Film That Skewers Hollywood

A studio executive concocts an animated blockbuster. Who cares about the story?

Video

In Online Dating, Everyone's a Little Bit Racist

The co-founder of OKCupid shares findings from his analysis of millions of users' data.

Video

What Is a Sandwich?

We're overthinking sandwiches, so you don't have to.

Video

Let's Talk About Not Smoking

Why does smoking maintain its allure? James Hamblin seeks the wisdom of a cool person.

Writers

Up
Down

More in Technology

Just In