Dielectric, electric and thermal properties of carboxylic functionalized multiwalled carbon nanotubes impregnated polydimethylsiloxane nanocomposite

New Strategy for Chemically Attachment of Imine Group on Multi-Walled Carbon Nanotubes Surfaces: Synthesis, Characterization and Study of DC Electrical Conductivity

“…The diffraction patterns, having large diffraction peaks resulting from the nanoscale, suggest enhanced crystallinity. The sharp and strong diffraction peak of MWCNT-NH 2 at 2θ = 26.6˚ correspond to the hexagonal graphite structure support [23] in Figure 6(a). In Figure 6(b), it appears that the intensity of the diffraction peak of Poly (Imine)/MWCNT is sharper than that of the MWCNT-NH 2 .…”

Nanocomposite-Based Microstructured Piezoresistive Pressure Sensors for Low-Pressure Measurement Range

“…MWCNTs, with a 98% relative purity of carbon, 2.1 mL/g density, average length 3–6 μm and with outer and inner dimensions of 10 ± 1 nm and 4.5 ± 0.5 nm respectively (Sigma-Aldrich, St. Louis, MO, USA), were chosen as the filler constituent of the MWCNT-PDMS nanocomposite. Due to the high aspect ratio of the filler particles, such composites are used in this article as they have been found to exhibit a percolation threshold of 0.3% to 2.5% [ 26 , 29 , 30 , 31 ], which is significantly lower compared to that of spheroidal particles such as carbon black or metal particles where a concentration of as high as 26% w / w has been reported [ 32 ]. PDMS (Sylgard 184, Dow Corning, Midland, MI, USA) was chosen as the elastomeric matrix of the composite over other elastomers such as PMMA, PLLA or polycarbonate [ 33 , 34 , 35 ], due to its low Young’s modulus of 1.7 MPa, low cost, chemical inertness and biocompatibility [ 36 , 37 ].…”

“…Due to the strong inter-tube Van der Waals attractive forces, CNTs form together highly aggregated agglomerates in their natural state and hence external mechanical energy is required to separate these aggregates [ 44 , 45 , 46 , 47 ]. A 20 kHz frequency, 500 W programmable ultrasonic probe (Fisher Scientific) directly immersed in the solution was employed, as it could generate the required dispersion in minutes [ 29 , 43 ], in contrast to sonication baths that typically require hours to achieve the desired dispersion [ 14 , 30 , 48 ]. Furthermore, due to the highly viscous nature of PDMS, the organic solvent toluene (Sigma-Aldrich) was also required to assist the dispersion of the CNTs as it exhibits good solubility with this polymer [ 43 , 47 , 49 , 50 ] and can be easily extracted prior to crosslinking the composite.…”

Tailoring in thermomechanical properties of ethylene propylene diene monomer elastomer with silane functionalized multiwalled carbon nanotubes

“…T m1 and T m2 respectively, are enhanced up to 58.28 and 11.21°C, respectively because nanotubes have offered much resistance to the matrix molecular chain mobility by entrapping phonons within the filler's network. Another major reason of the melting temperature enhancement is the higher thermal stability of incorporated S‐MWCNTs compared to carbon black …”