Technology

GRAPHENE

Graphene is a material consisting of only a single atom thick layer of carbon arranged in a hexagonal lattice. It is a unique material with extraordinary properties, such as incredible strength, great electrical and thermal conductivity and high flexibility to mention a few. Adding graphene to composites can transfer these properties into new and improved materials with increased mechanical strength, better abrasion resistance and antistatic properties.

Informational video about graphene starring one of the fathers of graphene Sir Konstantin Novoselov. The video is narrated in Danish and produced by DR.

Mechanical performance

Graphene is 200 times stronger than steel with a Young’s modulus and fracture strength of 1.0 TPa and 130 GPa, respectively, compared to steels Young’s modulus of 200 GPa and fracture strength of 585 MPa. These mechanical properties can be transferred to composites such as polymers or concrete. Pristine graphene is non-reactive and will agglomerate if it is not handled properly which will give no improvement to a composite.

Danish Graphene materials are functionalized to be compatible with bulk materials meaning the transfer of the graphene properties to another material is much better. The functional graphene is much easier to handle and does not agglomerate making it easier to disperse in a composite, which is essential for the best performance. With our products you get the most effect from adding graphene to increase mechanical performance and abrasion resistance of your materials.

Electrical conductance

Graphene conducts electricity 200 times better than silicon. Due to the shared electrons in the graphene the in-plane transport of electrons is extremely good. This conductivity of graphene makes it very interesting for electronic components, electrodes or conductive/antistatic composites.

Thermal properties

The thermal conductance of graphene is more than 10 times higher than that of copper. Graphene can be used to transport heat in for example electronic components where heat cannot be removed in other ways. Graphene even increases the thermal stability of the composites it is combined with.

Optical properties

A single layer of graphene only absorbs 2.3% of light making it almost completely transparent. This means that a thin layer on for example glass can produce transparent conductive glass surfaces which can give new opportunities in construction and architecture. With just a few layers of graphene it even gives UV protection to protect either the polymer material it is combined with from UV degradation or protect light sensitive components.

Non-permeable

Graphene is impermeable to gases, even oxygen cannot penetrate the material. This makes graphene very suited as a barrier material in applications where gas transport is not wanted. A layer of graphene in food packaging could help increase the shelf-life of certain foods decreasing food waste caused by oxygen contamination.

Our production

At Danish Graphene we produce functionalised graphene that is easily customised for your specific application and product. Our materials are produced with a unique method that allows us to incorporate various chemical handles on the graphene. This surface modification makes it easier to interact with the graphene and create a strong bond between a polymer and the graphene material. With a stronger interaction between the graphene and the surrounding material the properties of graphene are more effectively transferred and better composites are born.

The final graphene product is produced as a dry material that is easy to mix with other materials. The added functionalisation assists in dispersing the graphene as it increases the spacing between the flakes so they do not reform into graphite. Increased solubility and dispersion are key to achieving the best performance of your products.

We have access to equipment to mix the desired graphene material with your polymer materials and will prepare the solution with the exact properties you are looking for. This includes custom functionalisation and analysis of the composite material which gives you a guarantee for the product.

Choosing your graphene

There is a difference whether you are working with epoxies, polyurethanes or something completely different. Whichever material you are working with we can create the graphene best suited for it.

When developing your new products and optimizing properties you might want to see if the properties of graphene could give your product an extra boost. But how do you choose the right graphene material? The graphene market can be difficult to navigate if you do not have pre-existing knowledge about the different types of graphene materials available to you.

You will need to look at your product and the application it is used for, are you interested in increased mechanical performance, increased electrical conductance or something else? How can the properties of graphene help improve your product? For increased mechanical performance you will require a good interaction between the graphene and the surrounding material of your product. To achieve this a graphene material with a high degree of functionalisation is well suited as it gives a high degree of dispersion of the graphene in your product and facilitates strong interactions. To increase this interaction to the fullest you need to have the right surface modification of the graphene that matches the chemical composition of your product. 

If instead you are more interested in increasing electrical conductivity a low functionalisation is best as this keeps more of the graphene network intact for electron transport. For these applications a higher concentration of graphene is necessary, than for mechanical performance, as you will need to have contact between the graphene flakes for electron transport, but with the functionalised material you get a better dispersion which decreases the likelihood of agglomeration, which would make it impossible to conduct electricity through anything.

No matter the application or the material you are working with we have the expertise to guide you through choosing the right type of graphene.

Applications of graphene in composites

If you want to hear more or you are interested in trying out our graphene for your application feel free to browse the webshop or get in touch with us directly!
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