Influence of filler alignment in the mechanical and electrical properties of carbon nanotubes/epoxy nanocomposites

Thermosetting hierarchical composites with high carbon nanotube loadings: En route to high performance

“…The electrical properties and behaviour of NCs have been extensively studied and reviewed [22,23]; both electrical percolation and the maximum DC conductivity have been shown to be strongly affected by CNT purity [24], aspect ratio [25], processing parameters [26,27] and orientation [28][29][30]. The relationship between a perfect dispersion of fillers in a matrix and the percolation threshold has been formalised using the excluded volume concept [31,32], and provides a means to qualify the CNT dispersion state, by comparing the calculated percolation threshold using the CNT aspect ratio to that measured.…”

Ecofriendly E-Nose Based in PLA and Only 0.3 wt% of CNTs

“…Several authors have studied polymer-CNTs nanocomposites [4,7,11,12,13]. In order to improve the filler's dispersion, different physical and chemical modifications were performed; from the realization of covalent and non-covalent functionalizations through electrostatic interactions, to modifications in the applied shear stress during the dispersion processes, or the inclusion of different additives [14,15,16,17].…”

Filler orientation effect on relative permittivity of dielectric elastomer nanocomposites filled with carbon nanotubes

“…Many theories have been developed to predict the effective dielectric constant of composite materials such as Maxwell-Garnett (MG) rule of mixture [23,24], and finite-element-based approaches [10,25]. Some works have also focused on the filler orientation effects on both electrical and mechanical properties in extreme cases [18,[26][27][28]. The experimental efforts have been done on the alignment of MWNTs [27,29], and characterization of the electromagnetic properties of aligned ceramic based nanowires [28] and polymer based composites with aligned MWNTs [26,[30][31][32].…”

“…Some works have also focused on the filler orientation effects on both electrical and mechanical properties in extreme cases [18,[26][27][28]. The experimental efforts have been done on the alignment of MWNTs [27,29], and characterization of the electromagnetic properties of aligned ceramic based nanowires [28] and polymer based composites with aligned MWNTs [26,[30][31][32]. However, detailed specific relationship between the filler orientation parameter and the associated effective dielectric constant value, especially for composite materials with fillers of high aspect ratio and rod-like shape, has not been revealed yet.…”