The effect of field application on the morphology of the carbon nanotubes network is illustrated in Fig. 5. The surfaces shown were produced by notching the material in the through the thickness direction on both sides and fracturing after immersion in liquid nitrogen to generate a fracture parallel to the central 0° layers of the composite. The micrographs are indicative a preferential orientation of the nanotubes following the direction of the field in the case of the high current application (45 A/m2). This is a consequence of the anisotropic polarisability of carbon nanotubes leading to a rotation of individualised nanoparticles. It should be noted that the micrographs shown in Fig. 5(e) and (f) are typical of certain areas of the fracture surfaces of the material produced under a 45 A/m2 current density but do not represent a uniform phenomenon observed across the whole surface. However, areas of this type cannot be found on cryo-fracture surfaces of specimens produced without the application of the electric field (Fig. 5(a) and (b)) and are a rare occurrence in the material produced under the low electric field (Fig. 5(c) and (d)).