To demonstrate that fine aerogel structures can be produced in 3D printing, the researchers printed a lotus flower made of aerogel. Image: Empa
Aerogel is an excellent thermal insulator. So far, however, it has mainly been used on a large scale, for example in environmental technology, in physical experiments or in industrial catalysis. Empa researchers have now succeeded in making aerogels accessible to microelectronics and precision engineering: An article in the latest issue of the scientific journal “Nature” shows how 3D-printed parts made of silica aerogels and silica composite materials can be manufactured with high precision. This opens up numerous new application possibilities in the high-tech industry, for example in microelectronics, robotics, biotechnology and sensor technology.
Behind the simple headline “Additive manufacturing of silica aerogels” – the article was published on July 20th in the renowned scientific journal “Nature” – a groundbreaking development is hidden. Silica aerogels are light, porous foams that provide excellent thermal insulation. In practice, they are also known for their brittle behaviour, which is why they are usually reinforced with fibres or with organic or biopolymers for large-scale applications. Due to their brittle fracture behaviour, it is also not possible to saw or mill small pieces out of a larger aerogel block. Directly solidifying the gel in miniaturised moulds is also not reliably – which results in high scrap rates. This is why aerogels have hardly been usable for small-scale applications.
The Empa team led by Shanyu Zhao, Gilberto Siqueira, Wim Malfait and Matthias Koebel have now succeeded in producing stable, well-shaped microstructures from silica aerogel by using a 3D printer. The printed structures can be as thin as a tenth of a millimeter. The thermal conductivity of the silica aerogel is just under 16 mW/(m*K) – only half that of polystyrene and even significantly less than that of a non-moving layer of air, 26 mW/(m*K). At the same time, the novel printed silica aerogel has even better mechanical properties and can even be drilled and milled. This opens up completely new possibilities for the post-processing of 3D printed aerogel mouldings.
With the method, for which a patent application has now been filed, it is possible to precisely adjust the flow and solidification properties of the silica ink from which the aerogel is later produced, so that both self-supporting structures and wafer-thin membranes can be printed. As an example of overhanging structures, the researchers printed leaves and blossoms of a lotus flower. The test object floats on the water surface due to the hydrophobic properties and low density of the silica aerogel – just like its natural model. The new technology also makes it possible for the first time to print complex 3D multi-material microstructures
Insulation materials for microtechnology and medicine
With such structures it is now comparatively trivial to thermally insulate even the smallest electronic components from each other. The researchers were able to demonstrate the thermal shielding of a temperature-sensitive component and the thermal management of a local “hot spot” in an impressive way. Another possible application is the shielding of heat sources inside medical implants, which should not exceed a surface temperature of 37 degrees in order to protect body tissue.
A tiny, custom-made shield made of aerogel can effectively shield heat from electronic components. These thermal images show how the heat of a voltage controller on a motherboard is shielded (left without insulation, in the middle with an aluminum strip, right with a 3D-printed, custom-made aerogel block (far left); red/violet: high temperatures; green/blue: low temperatures). Image: Empa
A functional aerogel membrane
3D printing allows multilayer/multi-material combinations to be produced much more reliably and reproducibly. Novel aerogel fine structures become feasible and open up new technical solutions, as a second application example shows: Using a printed aerogel membrane, the researchers constructed a “thermos-molecular” gas pump. This permeation pump manages without any moving parts at all and is also known to the technical community as a Knudsen pump, named after the Danish physicist Martin Knudsen. The principle of operation is based on the restricted gas transport in a network of nanoscale pores or one-dimensional channels of which the walls are hot at one end and cold at the other. The team built such a pump from aerogel, which was doped on one side with black manganese oxide nanoparticles. When this pump is placed under a light source, it becomes warm on the dark side and starts to pump gases or solvent vapours.
These applications show the possibilities of 3D printing in an impressive way: 3D printing turns the high-performance material aerogel into a construction material for functional membranes that can be quickly modified to suit a wide range of applications. The Knudsen pump, which is driven solely by sunlight, can do more than just pump: If the air is contaminated with a pollutant or an environmental toxin such as the solvent toluene, the air can circulate through the membrane several times and the pollutant is chemically broken down by a reaction catalyzed by the manganese oxide nanoparticles. Such sun-powered, autocatalytic solutions are particularly appealing in the field of air analysis and purification on a very small scale because of their simplicity and durability.
The Empa researchers are now looking for industrial partners who want to integrate 3D-printed aerogel structures into new high-tech applications.
The Latest Updates from Bing News & Google News
Go deeper with Bing News on:
Aerogel
- Insole Innovation: Catching Up With OrthoLite VP Rob Falken On Its Groundbreaking O-Therm Technologyon April 2, 2021 at 7:14 am
SGB Executive caught up with VP of Innovation Rob Falken to dive into its latest foot-betterment technology. What’s unique about O-Therm, and how groundbreaking is it? It’s the world’s first open-cell ...
- Ceramic Aerogel Meets Stretch Goalson April 1, 2021 at 5:00 pm
However there’s always a downside, traditional aerogel material is brittle. Any attempt to compress it beyond 20% of its original size will change the material. Researchers at UCLA and eight ...
- The Global Market for Aerogels to 2031: Drivers & Challenges, Impact of COVID-19, Patent Analysis, Key Industry Players - ResearchAndMarkets.comon April 1, 2021 at 2:00 am
ResearchAndMarkets.com The Global Market for Aerogels to 2031: Drivers & Challenges, Impact of COVID-19, Patent Analysis, Key Industry Players - ResearchAndMarkets.com The “The Global Market for ...
- Flexible Ceramic Aerogel Eyed for High-Temperature Applicationson March 30, 2021 at 5:00 pm
Now a research team led by engineers at UCLA has come up with a new solution for this task in an extremely light, very durable ceramic aerogel that can withstand even extreme temperature spikes.
- Making Aerogel, It’s Not For The Faint-Heartedon March 30, 2021 at 5:00 pm
Aerogel — that mixture of air and silica — is one of those materials that seems like a miracle. It is almost not there since the material is 99% air. [NileRed] wanted to make his own and he ...
Go deeper with Google Headlines on:
Aerogel
Go deeper with Bing News on:
3D-printed aerogel micro-structures
- 3D Printed Aerogels Proven for Small-Scale Use in Microelectronicson March 22, 2021 at 5:00 pm
Researchers plan to continue their work on the materials and are currently seeking industrial partners to integrate 3D printed aerogel structures into high-tech applications, they said. Elizabeth ...
- Nanosilica Global Market Report 2021: COVID-19 Growth And Changeon March 8, 2021 at 3:37 am
New York, March 08, 2021 (GLOBE NEWSWIRE) -- Reportlinker.com announces the release of the report "Nanosilica Global Market Report 2021: COVID-19 Growth And Change" - https://www.reportlinker.com ...
- Nanosilica Global Market Report 2021: COVID-19 Growth And Changeon March 8, 2021 at 3:27 am
The launch of 3D printing aerogel microstructures has created immense demand in the nano-silica market.The 3D-printed aerogel micro-structures provide thermal insulation for miniature components. For ...
- 3D-Printed Aerogels Improve Energy Storageon April 23, 2015 at 7:21 am
Lawrence Livermore National Laboratory researchers have made graphene aerogel microlattices with an engineered architecture via a 3D printing technique known as direct ink writing. The 3D ...