CAU research team develops new composite material made of carbon nanotubes
Extremely lightweight, electrically highly conductive, and more stable than steel: due to their unique properties, carbon nanotubes would be ideal for numerous applications, from ultra-lightweight batteries to high-performance plastics, right through to medical implants. However, to date it has been difficult for science and industry to transfer the extraordinary characteristics at the nano-scale into a functional industrial application. The carbon nanotubes either cannot be combined adequately with other materials, or if they can be combined, they then lose their beneficial properties. Scientists from the Functional Nanomaterials working group at Kiel University (CAU) and the University of Trento have now developed an alternative method, with which the tiny tubes can be combined with other materials, so that they retain their characteristic properties. As such, they “felt” the thread-like tubes into a stable 3D network that is able to withstand extreme forces. The research results have now been published in the renowned journal Nature Communications.
A difficult candidate
Industry and science have been intensively researching the significantly less than one hundred nanometre wide carbon tubes (carbon nanotubes, CNTs), in order to make use of the extraordinary properties of rolled graphene. Yet much still remains just theory. “Although carbon nanotubes are flexible like fibre strands, they are also very sensitive to changes,” explained Professor Rainer Adelung, head of the Functional Nanomaterials working group at the CAU. “With previous attempts to chemically connect them with other materials, their molecular structure also changed. This, however, made their properties deteriorate – mostly drastically.”
In contrast, the approach of the research team from Kiel and Trento is based on a simple wet chemical infiltration process. The CNTs are mixed with water and dripped into an extremely porous ceramic material made of zinc oxide, which absorbs the liquid like a sponge. The dripped thread-like CNTs attach themselves to the ceramic scaffolding, and automatically form a stable layer together, similar to a felt. The ceramic scaffolding is coated with nanotubes, so to speak. This has fascinating effects, both for the scaffolding as well as for the coating of nanotubes.
The 360° video illustrates how CNT networks are created:
Porous ceramics are produced at high temperatures, as shown here by the coalescence of the four-pronged particles, which join together like fine snowflakes that form a closed, but light blanket of snow. The interconnected particles are coated with a network of carbon tubes (represented as a transparent shell) and then etched out.
This multimedia simulation about the scientific work from the group pf Professor Rainer Adelung, “Functional Nanomaterials” at Kiel University, was developed as part of a cooperation project between the Kiel Science Outreach Campus and the Mediadome at the Zentrum für Kultur- und Wissenschaftskommunikation (Centre for Culture and Science Communication, ZKW) of Kiel University of Applied Sciences.
via Eduard Thomas, Kiel University of Applied Sciences.
Following the principle of bamboo buildings
On the one hand, the stability of the ceramic scaffold increases so massively that it can bear 100,000 times its own weight. “With the CNT coating, the ceramic material can hold around 7.5kg, and without it just 50g – as if we had fitted it with a close-fitting pullover made of carbon nanotubes, which provide mechanical support,” summarised first author Fabian Schütt. “The pressure on the material is absorbed by the tensile strength of the CNT felt. Compressive forces are transformed into tensile forces.”
The principle behind this is comparable with bamboo buildings, such as those widespread in Asia. Here, bamboo stems are bound so tightly with a simple rope that the lightweight material can form extremely stable scaffolding, and even entire buildings. “We do the same at the nano-scale with the CNT threads, which wrap themselves around the ceramic material – only much, much smaller,” said Helge Krüger, co-author of the publication.
Using tiny carbon tubes to create high-performance plastics
The materials scientists were able to demonstrate another major advantage of their process. In a second step, they dissolved the ceramic scaffolding by using a chemical etching process. All that remains is a fine 3D network of tubes, each of which consists of a layer of tiny CNT tubes. In this way, the researchers were able to greatly increase the felt surface, and thus create more opportunities for reactions. “We basically pack the surface of an entire beach volleyball field into a one centimetre cube,” explained Schütt. The huge hollow spaces inside the three-dimensional structure can then be filled with a polymer. As such, CNTs can be connected mechanically with plastics, without their molecular structure – and thus their properties – being modified. “We can specifically arrange the CNTs and manufacture an electrically conductive composite material. To do so only requires a fraction of the usual quantity of CNTs, in order to achieve the same conductivity,” said Schütt.
Simple procedure for numerous applications
Applications for use range from battery and filter technology as a filling material for conductive plastics, implants for regenerative medicine, right through to sensors and electronic components at the nano-scale. The good electrical conductivity of the tear-resistant material could in future also be interesting for flexible electronics applications, in functional clothing or in the field of medical technology, for example. “Creating a plastic which, for example, stimulates bone or heart cells to grow is conceivable,” said Adelung. Due to its simplicity, the scientists agree that the process could also be transferred to network structures made of other nanomaterials – which will further expand the range of possible applications.
Learn more: Fine felted nanotubes
The Latest on: Carbon nanotube networks
- Global Carbon Nanotube X-Ray Tube (CNT X-Ray Tube) Market Growth 2021-2026on June 29, 2021 at 9:44 pm
Pages Report] Check for Discount on Global Carbon Nanotube X-Ray Tube (CNT X-Ray Tube) Market Growth 2021-2026 report by LP Information INC. According to this latest study, the 2021 growth of ...
- Power/Performance Bits: June 29on June 29, 2021 at 12:03 am
In fact, the team was looking into a combination of perovskite nanocrystals with a network of single-walled carbon nanotubes they thought could have interesting properties for photovoltaics or ...
- Carbon Nanotube Transistors Are On The Passing Laneon June 27, 2021 at 5:00 pm
In particular, the team managed to assemble arrays of carbon nanotube transistors that outperform their silicon-based predecessors. One obstacle the researchers had to overcome were metallic ...
- carbon nanotubeon June 22, 2021 at 5:00 pm
Scientists have developed a flexible conductive material made up of carbon nanotubes, cross-linked polymers, and enzymes connected to each and printed through screen-printing. This type of ...
- Carbon Nanotube (CNT) Market Technological Growth 2021-2026 with Types, Applications and Top Companieson June 17, 2021 at 11:55 pm
The market study on the global Carbon Nanotube (CNT) market will encompass the entire ecosystem of the industry, covering major regions namely North America, Europe, Asia Pacific, South America, ...
- New composite revs up electric vehicle researchon June 17, 2021 at 5:00 am
In the pursuit of electric cars with better range and lower cost, researchers have sought improvements to every inch of the vehicle, from a lighter-weight chassis to more energy-dense batteries. ORNL ...
- Teeny Tiny Tuneson June 15, 2021 at 5:00 pm
The carbon nanotube radio consists of an individual carbon fiber glued ... Chan and his colleagues have been working with a network of allies, in government and the private sector, to ensure that this ...
- Insights on the Carbon Nanotube Global Market to 2026 - Key Motivators, Restraints and Opportunitieson June 11, 2021 at 8:31 am
DUBLIN, June 11, 2021 /PRNewswire/ -- The "Global Carbon Nanotube Market 2020-2026" report has been added to ResearchAndMarkets.com's offering. The global carbon nanotube market is growing at a ...
- The Worldwide Carbon Nanotube Industry is Expected to Grow at a CAGR of 13.8% Between 2020 and 2027 - ResearchAndMarkets.comon June 10, 2021 at 9:36 am
The "Global Carbon Nanotube Market 2020-2026" report has been added to ResearchAndMarkets.com's offering. The global carbon nanotube market is growing at a considerable CAGR of 13.8% during the ...
- Carbon Nanotube-Based Material Can Power Chemical Reactions by Scavenging Energyon June 8, 2021 at 12:22 pm
In 2010, Strano demonstrated, for the first time, that carbon nanotubes can generate “thermopower waves.” When a carbon nanotube is coated with layer of fuel, moving pulses of heat, or thermopower ...
via Google News and Bing News