Carbon nanotubes (CNTs) have to be dispersed for many applications wherefore the CNT-interaction behavior plays a crucial role. In order to describe CNT-fluid interactions the wetting behavior was characterized with the capillary liquid penetration method. The free surface energy regarding Owens and Wendt could be derived from wetting angles. The determined surface energies were used for the description of the CNT dispersibility. Successful dispersions could be achieved if the fluid and the particles possessed similar dispersive and polar fractions.