«Honestly, I spent a lot of time thinking about how to explain a material that's 99% nothing, yet does the impossible. Every time you try to describe aerogel to someone new, you get that skeptical look: 'Solid air? Yeah, right.' And then you show them a video with a blowtorch, and that skepticism turns into awe. I hope I managed to convey that sense of wonder from science that makes reality stranger than fiction.» – Lucas Vander
Imagine a material that weighs less than a feather, looks like frozen fog, and can support thousands of times its own weight. Sound like something out of a sci-fi novel about the distant future? But aerogel has been around for almost a hundred years, and if you haven't heard of it, it's only because it's too busy saving Mars rovers from the cold and turning ordinary windows into energy-efficient marvels.
Что такое аэрогель и как выглядит "призрачный" материал
What Is Aerogel and Why Does It Look Like a Ghost?
Aerogel is a solid material that's 90-99% air. Yes, you read that right: air. The rest is an incredibly fine, three-dimensional network of silicon dioxide, metal oxides, or organic polymers. If ghosts existed and decided to materialize, they'd probably look a lot like aerogel: translucent, almost weightless, yet solid.
It was invented in 1931 by American chemist Samuel Kistler, who made a bet with a colleague about whether the liquid in a gel could be replaced with gas while preserving its structure. Kistler won the bet, creating a material he called 'aerogel,' and scientists have been marveling at its properties ever since.
Classic aerogel is made from silica – the same stuff ordinary glass is made of. But while glass is dense and heavy, aerogel is like its skeleton, stretched out in space. Imagine a building where only the framework of the thinnest beams remains, and everything else is empty space. That's pretty much what aerogel's structure looks like at the micro-level.
Как производят "замороженный дым"
How 'Frozen Smoke' Is Made
The process of creating aerogel is like a recipe from a mad scientist. First, you take a liquid gel – for instance, by mixing silicon compounds with water or alcohol. You get something like Jell-O, only runnier. Then the magic begins: you have to remove all the liquid from the gel without causing the delicate solid structure to collapse.
Simple drying won't work. As the liquid evaporates from the surface, it creates surface tension that literally shatters the fragile framework from the inside. It's like trying to air-dry soap bubbles: they'd pop long before they could harden.
That's why one of two methods is used. The first is supercritical drying. The gel is placed in a special chamber where temperature and pressure are raised to a point where the liquid enters a supercritical state – something between a liquid and a gas. In this state, surface tension doesn't exist, and the fluid can be safely removed without destroying the structure. The second method is freeze-drying, where the liquid is frozen and then evaporated directly from a solid to a gaseous state, bypassing the liquid phase.
The result? A material that looks like a piece of bluish fog, frozen in space. This appearance earned aerogel its nickname, 'frozen smoke.'
Удивительные свойства и возможности аэрогеля
The Superpowers of a Weightless Giant
Now for the fun part: what can this stuff, which weighs less than the air in your room, actually do?
God-Tier Thermal Insulation
Aerogel is one of the best thermal insulators on the planet. Its thermal conductivity can be 39 times lower than fiberglass and 100 times lower than regular glass. Why? Because heat is transferred in three ways: conduction (through the material), convection (through air movement), and radiation (through electromagnetic waves).
In aerogel, the solid structure is so fine and winding that heat simply can't pass through it effectively. The air in its pores is trapped in tiny, nanometer-sized cells – too small for convection to occur. And special additives can block infrared radiation. The result is a material that insulates better than a meter-thick brick wall, with a thickness of just a couple of centimeters.
Here's the classic experiment: place a thin layer of aerogel on your hand and aim a blowtorch at it, with a temperature of around 1000 degrees Celsius. Your hand won't even feel the warmth. It's like having a sci-fi shield, except it's completely real.
The Strength of a Castle in the Air
Even though aerogel is mostly empty space, it's surprisingly strong. Some types can withstand a load 2,000 times their own weight. A one-kilogram sample of aerogel can support two tons. The secret is that the load is distributed across billions of thin partitions, each contributing its share.
It works a bit like a honeycomb: a single wax wall might seem fragile, but the entire structure is incredibly effective. However, aerogel has a weakness – it's brittle when bent and can shatter from an impact. But as of early 2026, scientists are already creating composite versions with added polymer fibers that give the material flexibility.
Absorbency Like a Sponge on Steroids
Thanks to its enormous internal surface area (up to 1,000 square meters per gram – that's like two tennis courts in a piece the size of a sugar cube), aerogel is excellent at absorbing various substances. Special hydrophobic versions can absorb oil and petroleum products while repelling water. One kilogram of this aerogel can soak up to 900 liters of oil.
Imagine a sponge that weighs as much as a feather but can soak up a bathtub full of liquid. This is what makes aerogel a promising candidate for cleaning up oil spills – though for now, its high price limits widespread use.
Где аэрогель уже применяется сегодня
Where Aerogel Is at Work Right Now
Space: Its Favorite Playground
NASA loves aerogel, and for good reason. In 2004, the Stardust spacecraft used aerogel to collect comet dust particles traveling at 6 kilometers per second – six times faster than a bullet. The aerogel slowed the particles so gently that they remained intact for study, leaving behind distinctive carrot-shaped tracks in the translucent material.
Mars rovers use aerogel to insulate their electronics. At night on Mars, temperatures plummet to minus 100 degrees Celsius, and conventional materials simply can't handle such a temperature swing. And in the future, when we get around to building bases on the Moon or Mars, aerogel will be a key material for protecting habitats from cosmic cold and radiation.
Energy Efficiency in Buildings
In Europe, where energy prices in early 2026 are still high following the energy crisis a few years back, aerogel is gradually making its way into construction. It's added to window panes – a layer of aerogel between the glass makes a window several times more efficient than a standard one, while remaining translucent.
Manufacturers also produce aerogel panels and blankets for insulating walls, pipes, and roofs. This is especially valuable in historic buildings where you can't significantly increase wall thickness – two centimeters of aerogel works like 20 centimeters of traditional insulation.
Yes, it's expensive. A square meter of aerogel insulation can cost 5-10 times more than conventional insulation. But if you calculate the heating savings over 20 years, especially in Northern Europe, the numbers start to look more appealing. In Amsterdam, for example, where winter temperatures regularly drop below freezing and houses are often old and poorly insulated, such solutions can pay for themselves in 7-10 years.
Industry and the Oil & Gas Sector
Pipes carrying liquefied natural gas at minus 162 degrees Celsius require exceptional insulation. Aerogel is indispensable here – it not only insulates perfectly but also takes up minimal space, which is critical on offshore platforms and tankers where every cubic meter counts.
In the chemical industry, aerogel coatings protect workers from equipment with extreme temperatures. You can wrap a pipe carrying superheated steam with a finger-thick layer of aerogel, and it will be safe to touch.
Unusual Applications
Some companies have started adding aerogel to sportswear and footwear for mountaineers and polar explorers. A jacket with an aerogel layer keeps you as warm as a down jacket but weighs half as much and doesn't lose its properties when wet.
In medicine, experiments are being conducted with aerogel as a drug delivery vehicle – its porous structure allows for loading drugs and releasing them gradually. And in electronics, aerogel is being considered as a promising material for next-generation batteries – its vast surface area could significantly increase battery capacity.
Почему аэрогель ещё не стал повсеместным
Why Isn't Aerogel Everywhere Yet?
If aerogel is so great, why don't we see it everywhere? The answer is simple and unpleasant: money.
Aerogel production is an energy-intensive and slow process. Supercritical drying requires expensive equipment, high pressure, and precise temperature control. The result is a material that can cost anywhere from €20 to €200 per kilogram, depending on the type and quality. For comparison, standard mineral wool costs less than a euro per kilogram.
The second issue is fragility. Classic silica aerogel can be accidentally crumbled just by handling it carelessly. This complicates transportation, installation, and use. True, modern composite versions with added polymers or fibers solve this problem, but they are even more expensive.
The third factor is the lack of mass production. As long as demand is limited to niche applications, manufacturers can't scale up to volumes that would reduce costs. It's a classic catch-22: it's expensive because it's not mass-produced, and it's not mass-produced because it's expensive.
But the situation is changing. With the development of new production methods, including ambient pressure sol-gel processes and the use of biomaterials, prices are gradually coming down. In 2025-2026, some companies have announced plans to launch large-scale production lines that could make aerogel 3-5 times cheaper by the end of the decade.
Различные типы аэрогелей: не только кремниевый
Types of Aerogel: Not Just Silica
Although silica aerogel is the most famous and common type, it's far from the only one. Scientists have learned to make aerogels out of almost anything.
Carbon Aerogels
If you pyrolyze a silica aerogel (heat it without oxygen), it turns into a carbon aerogel – black, electrically conductive, and even lighter. These materials are used in electrodes for supercapacitors and fuel cells. Carbon aerogel can withstand extremely high temperatures without oxidizing.
Metallic Aerogels
Aerogels made from oxides of aluminum, titanium, or other metals have unique catalytic properties. They are used for gas purification, accelerating chemical reactions, and even in photocatalysis – processes where light triggers chemical transformations.
Biological Aerogels
From cellulose, pectin, chitin, and other natural polymers, you can make biodegradable aerogels. This opens the door to eco-friendly packaging materials, medical implants, and carriers for agrochemicals. Imagine a fertilizer that's slowly released into the soil from an aerogel capsule that biodegrades over a few months.
Graphene Aerogels
One of the lightest materials on the planet, graphene aerogel, weighs just 0.16 milligrams per cubic centimeter. That's six times lighter than air. Such a material can balance on a blade of grass or a flower petal. At the same time, it has high electrical conductivity and mechanical strength, making it a candidate for flexible electronics and sensors.
Будущее "замороженного дыма"
The Future of 'Frozen Smoke'
What can we expect from aerogel in the coming years? If research and forecasts are to be believed, the aerogel market could grow three to four times by 2030 compared to early 2026. The drivers will be energy efficiency in buildings, space programs, and the growth of electric transport, where lightweight and effective insulation is critical for extending range.
An interesting direction is aerogel for capturing carbon dioxide from the atmosphere. Modified aerogels with a chemically active surface can capture CO₂ hundreds of times more effectively than traditional methods. This could become part of the technology for combating climate change.
In architecture, experiments with transparent aerogel panels could lead to buildings with natural lighting that are also fantastically energy-efficient. Imagine a house with transparent walls that is warm in winter and cool in summer, without air conditioners or powerful heating.
Perhaps in a few years, aerogel will become as commonplace as plastic or fiberglass. But for now, it remains in the 'expensive, but cool' category – a material for those willing to pay for cutting-edge technology and maximum efficiency.
Почему вам стоит узнать об аэрогеле
Why You Should Care
It might seem that aerogel is just a toy for scientists and space agencies, with no relevance to everyday life. But think about this: every material we use universally today – from plastic to concrete – was once an exotic laboratory curiosity.
Aerogel solves one of the key problems of our time: how to do more with fewer resources. Less material, less energy for heating and cooling, fewer emissions. In a world where every degree of warming matters and energy is expensive, materials like aerogel are not just an engineering novelty, but a necessity.
Besides, it's just beautiful. Holding a piece of bluish fog that weighs almost nothing, yet is stronger than it looks and protects from extreme temperatures – it's like touching the future. And the future, it turns out, is mostly made of air.
So, the next time you're dreaming of a warm house in winter or watching news about Mars rovers, remember aerogel. This weightless material, which looks like a ghost and works like a super-insulator, is gradually changing how we build, travel, and save energy. And that, perhaps, is worth three espressos and Mary the cat's approval.
