New Nanostructured Snack Packaging Is Most Airtight Ever

A new coating material for food packaging could keep sodas fizzy, chips crispy and military rations more edible, scientists say. It's made of a thin film of nanoscale bits of clay, the same kind used to make bricks, mixed with polymers. When viewed under an electron microscope, the film looks like bricks and mortar, according to its creator.

The nanobrick film was unveiled over the weekend at the National Meeting and Exposition of the American Chemical Society in Anaheim, Calif. According to Jaime Grunlan, who developed the material, it is "truly the most oxygen-impermeable film in existence," as impervious to air as glass is.

Snack makers have experimented with a wide range of futuristic packaging materials, all meant to keep food fresh even as it languishes on store shelves. Most of the packaging processes are meant to keep out oxygen; current examples include soda bottles coated with silicon oxide and chip bags lined with foil. But metal - also used in the military's meals ready to eat - can't be microwaved, and consumers can't see inside to glimpse the tasty treats.

The new material would be layered onto an existing plastic package, improving its strength and blocking oxygen, according to a news release from the ACS. It's made from montmorillonite clay, a soil component that is also used to make bricks, but it looks transparent.

Beyond keeping Twinkies fresh for millennia, the nanobricks could also be used to make flexible electronics, tires and even sporting goods, according to ACS. "It could potentially help basketballs and footballs stay inflated longer than existing balls," ACS says.

Popular Science is your wormhole to the future. Reporting on what's new and what's next in science and technology, we deliver the future now. [American Chemical Society, Photo credit: lyzadanger Flickr]

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    You and the National Meeting and Exposition of the American Chemical Society have been taken for a ride. This technology has been around for years now. US Patent # 5,021,515, issued June 4, 1991 and US Patent # 6,232,388, issued May 1, 2001. I have been using this in my product packaging for almost a year and researched it at least a year prior to that. The technology was introduced as early as 2005 at the Pira International Conference in Brussels, Belgium, December 5-6, 2005. It was presented by Peter Maul, President of Nanocor, Incorporated in a paper titled, "BARRIER ENHANCEMENT USING ADDITIVES." One of the nanoclay composites is MXD6 Nanocomposites ImpermĀ®. Imperm is based on a unique polyamide called metaxylylene adipamide (tradename MXD6), which is itself a high barrier plastic. With the addition of nanoclay, it exhibits exceptional barrier. Oxygen barrier improves by a factor of 5 times and exceeds ethylene vinyl alcohol (EVOH), particularly at high relative humidities and especially at high ambient temperatures. Water vapor transmission is cut in half. Aroma permeation is very low. CO2 barrier exceeds any and all commercially available resins.
    With all of this information I can not see how the person, Jaime Grunlan, who claims he developed the material can get away with the claim.

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