Network NanoCarbon

The international network
for innovative nanocarbon products

Dispersion methods

Due to the production process, the nanocarbons are mainly present as agglomerates or aggregates. To allow their outstanding properties to fully develop, it is necessary to disperse them homogeneously and as gently as possible in the medium or in one of its components. Different technologies are used depending on the viscosity and nature of the medium.

Three-roll mill

The three-roll mill has proven to be effective in the dispersion of nanocarbons, especially MWCNTs, in low- to medium-viscosity media and also in high-viscosity pastes. Since the final particle size can be predefined via the roller spacing, it is possible to configure especially narrow particle-size distributions without residual agglomerates, which are often bothersome. In practice, this device is primarily used to disperse nanocarbons in reaction resin components.

High-pressure shear dispersion

In high-pressure shear dispersion, which is especially suited to aqueous and low-viscosity media, the mixture is pumped under high pressure through a narrow nozzle. The resulting shear forces pull in principle the agglomerates apart. Hence this method is often used for MWCNT agglomerates.

Ultrasound dispersion

Ultrasound dispersion is also well suited to aqueous and low-viscosity media, and especially for aggregated nanoparticles. Here, the forces break the aggregates apart during cavitation of the gas bubbles. With strongly entangled agglomerates, e.g. MWCNTs, the method is often insufficient on its own.

Ball Mill

The ball mill is also well-suited to low-viscosity media, provided correspondingly small balls are used. Since the viscosity rises strongly as dispersion increases, certain limits are set here with regard to concentration. Since it is possible to apply relatively large amounts of energy using ball mills, care must be taken to ensure that the possible material damage is not too great.

Twin-screw extruders

Twin-screw extruders have proven to be especially well-suited to dispersing nanocarbons in molten thermoplastics. In order to ensure the highest possible shear-energy input, as is necessary for dispersing MWCNT agglomerates, it is recommended to feed the nanoparticles in directly together with the granulate at the start of the screw.

Twin-screw kneader

The twin-screw kneader has proven to be effective for the production and analysis of mixtures primarily consisting of elastomers, but also of thermoplastics, thermosets or ceramic moulding compounds with fillers, pigments and many other plastic and plasticisable substances in realistic conditions. A homogeneous mass is achieved through optimum mixing using tangentially interlocking rotors.


The Nanoaugmented Materials Industry Summit ´19

|   NanoCarbon News

The way forward to mass- and energy-efficient EVs: rapid progress with graphene nanotubes reviewed at NAUM’19


Read more

Konferenz „Hybride Materialen – Nano goes Macro“ am 6. und 7. November 2019 in Nürnberg

|   Cluster News

Unter der Schirmherrschaft von Staatsminister Hubert Aiwanger lädt der Cluster Nanotechnologie herzlich zur Fachkonferenz ein.

Read more

Do you Kyoto?

|   NanoCarbon News

World-leading companies share their approaches to environmentally friendly business at NAUM’19

Read more

Langen Nacht der Wissenschaften

|   Cluster News

19. Oktober 2019, Erlangen

Read more

NanoCarbon Annual Conference 2020

|   Cluster Veranstaltungen

03.-04.03.2020 in Würzburg

Read more