Buzz
In the realm of scientific research, foam is far more than the bubbles in your beer. It takes form as gels, solids, and even at the quantum scale, holding promise to enhance human life in extraordinary ways.
This adaptable material drives innovation in areas like warfare, surgical procedures, and robotics. It also contributes to creating safer environments for the public. In its most intriguing manifestation, foam lies at the core of a puzzle that challenges our understanding of reality itself.
10. Advanced Submarine Exploration
Most vehicles, ships, and aircraft are equipped with a material known as syntactic foam. This substance is celebrated for being light, strong, and buoyant. These qualities make syntactic components ideal for submarines, with one exception: they emerge from injection molds as smaller sections that need to be joined together, and any seams are prone to failure.
In 2018, researchers realized that 3-D printing could overcome this challenge by creating the entire part as one piece instead of separate sections. The process wasn’t simple. Syntactic foam consists of millions of hollow microspheres, made of glass or ceramic, suspended in plastic resin.
Initially, the microspheres either got crushed when mixed with the resin or clogged the printer’s nozzle. The breakthrough came when the team switched to a different plastic resin and replaced the spheres with fly ash balls. Controlling the blending process was tricky because the balls still had the potential to flatten, but eventually, it worked.
Using commercially available printers, the first fully-formed syntactic foam components were produced. This innovation holds particular significance for deep-sea submarines, as manufacturers can now consider printing large parts as a single unit, allowing submarines to withstand the immense pressure of deeper dives than ever before.
9. Foam That Eats Asbestos
Asbestos was once the go-to material for fireproofing buildings. Composed of magnesium and silicon oxides, it was both fire-resistant and helped prevent plaster from falling off the walls.
It wasn’t until later that the truth about asbestos being a dangerous carcinogen came to light. By that time, it had been used for decades in homes, offices, and schools. Removing the material proved costly and time-consuming, and worse, when asbestos is disturbed, its fibers can become airborne and be inhaled.
Recently, a Florida-based fireproofing company came up with an innovative solution. They developed a special foam made from fluoride ions and acids. When injected into a wall, this chemical foam breaks down asbestos fibers into a harmless silicate. Not only does this process save homeowners the expense of replacing the wall and the risk of illness, but the material left behind remains fire-resistant.
8. The First Soundproof Nanofoam
When Russians and Koreans collaborate, the results are often intriguing. In this case, the researchers created the world’s first sound-absorbing nanofoam. While it may seem modest, this revolutionary material has the potential to save lives.
Using foam as a noise blocker is not a new concept. However, previous efforts only blocked higher frequencies, whereas the lower range is far more harmful to human health. Low-frequency sounds, such as infrasound, can cause serious health issues.
The new nanofoam is the closest scientists have come to neutralizing low-frequency sounds. It absorbed frequencies as low as 0.5–1.6 kHz. The process involved taking regular sound-absorbing foam sheets and injecting them with tiny silica and magnetite granules. The final steps included soaking the sheets in liquid nanopowder, followed by ultrasonic treatment and drying.
The resulting material resembled the well-known aerogels but was cheaper and easier to handle. The future of nanofoam looks promising, with the potential to absorb significant amounts of noise in various environments—from inside vehicles to across entire neighborhoods.
7. Gold That Floats
In 2015, Swiss scientists took precious metals to an entirely new level—they transformed gold into foam. They harvested tiny fibers called amyloid fibrils from milk proteins and mixed them with a gold saline solution. The result was a substance that resembled a blend of strings and gel.
Air drying initially damaged the delicate structure, but success came when the researchers discovered how to dry the mass with a carbon dioxide bath. The resulting gold foam was made up of 98 percent air, allowing it to float on water.
Indistinguishable from regular gold, this new form could revolutionize the jewelry industry. Since the foam is a thousand times lighter than traditional gold alloys, jewelers can now shape pieces by hand.
The color of gold also influences its desirability. The foam’s production process can be adjusted to change the appearance of the metal. Specifically, altering the reaction conditions can turn the gold into a deep red hue.
6. Transforming Cars Into Foam
When people think about how cars contribute to pollution, they typically focus on exhaust emissions. However, the cars that are taken out of service every year add millions of tons of waste to the environment.
In particular, two types of plastic are especially difficult to recycle: polycarbonate (PC) and polyurethane (PUR). These materials require a complex chemical process that is often not economically viable.
In 2017, researchers discovered an innovative method to recycle these plastic components from old cars—including PC and PUR. By using coconut oil and microwaves, the scientists were able to transform these parts into a versatile foam.
Initially, the plastic was recovered from waste and reformed into a usable material before being combined with existing foam. Previous attempts at this process resulted in brittle foam, but the coconut-treated plastics didn’t have that issue. The resulting foam was stable and had increased fire resistance.
This recycling method transformed two major plastic waste sources into a versatile material with numerous applications. From simple to complex uses, the foam can be used in cushions or serve as insulation in the construction and automotive sectors.
5. Bulletproof Foam
Afsaneh Rabiei, a professor of mechanical and aerospace engineering, developed a strong interest in composite metal foams (CMFs). After years of working on this unique foam type, Rabiei shared some of its most impressive features in 2015.
One of the standout qualities is its resistance to armor-piercing bullets. During testing, multiple bullets shattered on impact with the foam. Lighter than metal plating, it provides soldiers and combat vehicles with greater mobility and enhanced protection.
One of the standout qualities of CMFs is their resistance to intense heat, making them a go-to for those concerned about fire hazards. Moreover, CMFs are incredibly effective at blocking harmful radiation, including neutron radiation, gamma rays, and X-rays. This makes metallic foam ideal for space missions or safely transporting nuclear waste across distances.
4. Internal Bandage
DARPA, known for its groundbreaking technologies, created an unusual invention: injecting large amounts of foam into the stomach of an injured soldier—well, not exactly into a soldier.
Instead of using actual soldiers, scientists tested the foam on pigs to evaluate its potential as a life-saving tool for medics on the battlefield. Internal bleeding is a major threat that requires rapid attention, but combat soldiers often don't have immediate access to an operating room.
DARPA's innovative foam is created by injecting two separate liquids that combine to form a hybrid polymer, expanding 30 times its original size. As it swells, the foam tightly conforms to organs and tissues, hardening and effectively slowing abdominal bleeding. Remarkably, excess blood does not impact how the foam operates.
The foam can be removed with a simple incision, and within a minute, the pig is free of foam. This technique significantly improved the animals’ chances of survival, raising hopes that the foam could keep human patients alive long enough to receive medical treatment at the hospital.
3. Fabric Of Space Mystery
There are hints that the true nature of space may be a chaotic froth, with particles referred to as 'space foam.' While no one has directly observed space foam due to its minuscule size, these particles are currently understood only in theoretical terms.
In 1947, Dutch physicists predicted the existence of space foam, suggesting it could be observed through its effect on two metal plates. The idea was that particles create waves, and if space foam were real, only short waves would form between the plates, eventually being overpowered by longer, stronger waves pushing the plates together. This phenomenon, called the 'Casimir Effect,' was first observed in 1997.
However, the quantum realm rarely follows simple rules. In another experiment, two photons emitted from a stellar explosion were timed. If space foam existed, its density would cause one photon to slow down, preventing both from reaching the same point at the same time.
Multiple studies of such explosions yielded mixed results. Sometimes the photons arrived together, while other times, one photon reached the destination first. It seemed as if space foam appeared in some experiments but vanished in others. If this froth is confirmed, it would not only revolutionize our understanding of space itself but could alter our entire perception of reality.
2. A Working Heart
In 2015, an incredible creation emerged from a 3-D printer at Cornell University: an artificial human heart made from memory foam, also known as poroelastic or elastomeric foam. What makes this synthetic organ extraordinary is its ability to pump just like a real human heart.
This cardiovascular device operates with remarkable sensitivity to biological pressures and fluid movements, all thanks to the flexible foam outer layer. But the heart’s benefits go beyond circulation; it was designed using both a 3-D printer and a reusable mold, providing an economic advantage.
If this foam heart ever receives a patent and is introduced into the operating room, it could make heart transplants a more affordable option for many patients.
1. Robots With Melting Muscles
There’s a reason why surgeons, engineers, and DARPA envision squishy robots. Shape-shifting machines can wriggle into narrow spaces, making them perfect for reaching deep into disaster zones or even inside the human body, such as behind the liver.
In 2014, MIT researchers achieved a groundbreaking feat by creating a 'muscle.' This innovation marks the beginning of a future where artificial dexterity could someday mimic the extraordinary flexibility of an octopus.
What’s truly remarkable is that this major breakthrough was accomplished using materials easily found in any craft store—polyurethane foam and wax. The engineers placed a foam lattice in melted wax, running an electrical current through it. This process melted the wax, causing the robotic muscle to soften.
To solidify the muscle, the current was simply switched off, and the wax cooled. Future iterations of the invention could replace the wax with robotic fluids, which could shift between solid and liquid states when influenced by magnetic fields or electrical currents.
