Mechanical and physical properties on carbon nanotube

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

“…A lower bound for the critical length (1130±120 nm) was estimated by doubling the average of the ten longest CNTs protruding from fracture surfaces. From the slope of the linear fit of the NC fracture strengths with Equation 6, a CNT strength of 2.9±0.6 GPa was calculated, which agrees well with experimental results (3.6 GPa) for CVD grown CNTs [49]. The CNT-matrix interfacial shear strength (IFSS) was estimated from Equation 7, where r is the CNT radius and lc the critical…”

Polysiloxane Surfactants for the Dispersion of Carbon Nanotubes in Nonpolar Organic Solvents

“…3(C) showing the dispersion assisted by mPSi 70 indicates that most tubes were isolated and This is a side effect of sonication which has been quantified in [21]. With 1 hr sonication, most tubes were getting close to the theoretical limiting length L lim ; this limiting length was calculated to be ∼2-5 µm using the formula L lim = d 2 σ * /2η(Ṙ i /R i ) [21], given that the nanotube diameter d ∼50-100 nm, the breaking strength σ * ∼ 4 GPa for CVD MWNTs [24], η ∼ 0.01 Pa.s for typical low-viscosity solvents andṘ i /R i ∼ 10 8 s −1 for a cavitation bubble implosion event during sonication (with R i andṘ i being the bubble radius and the bubble wall velocity respectively). Well-defined nanotube lengths could only be determined in the surfactant-assisted dispersion in Fig.…”

Microstructural and Electrical Properties of Copper–Titanium Alloy Dispersed with Carbon Nanotubes via Powder Metallurgy Process

“…Carbon nanotubes (CNTs) exhibit excellent properties such as high Young's modulus and electrical conductivity. 4,5) They are expected to improve both mechanical and electrical properties by their dispersion in the materials. However, it is difficult to uniformly distribute CNTs in the metal matrix because CNTs are easily bundled by van der Waals interaction force between carbon atoms of their outermost walls.…”