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(Color online) Thermal conductivity enhancement, , of SWNT/epoxy composites as a function of AP- and P-SWNT loading. The inset shows diameter disk samples of neat epoxy and SWNT/epoxy composites.
(Color online) [(a)–(d)] Characterization of the purity of four SWNT fractions utilized for SWNT/epoxy composites by NIR spectroscopy. The SWNT relative purity (RP) is proportional to the ratio of the area of the spectral feature corresponding to the second interband transition of semiconducting SWNTs, after a base line correction [(a)–(d), top panels], to the total area under the spectral curve (bottom panels); [(e)–(h)] AFM images of the same four SWNT fractions; [(i)–(l)] SEM images of SWNT/epoxy composites prepared using the same four SWNT fractions; and (m) thermal conductivity enhancement for the SWNT/epoxy composites prepared using the same four SWNT fractions and carbon material loading.
(Color online) (a) Thermal conductivity of SWNT/epoxy composites as a function of SWNT volume fraction of AP- and P-SWNTs. Theoretical values are shown as dashed straight lines: 1 (Ref. 11 ) and 2 (Ref. 2 ). (b) Electrical conductivities of SWNT/epoxy composites as a function of for AP- and P-SWNTs. The curves correspond to fits obtained using the percolating network model with best fitting parameters: threshold volume fraction (1.0%) and critical exponent (2.4) for AP-SWNTs (P-SWNTs). The inset shows the same fit in vs plots; AFM images of (c) AP-SWNTs; and (d) P-SWNTs at similar SWNT concentrations showing the tendency of AP-SWNTs to form extended clusters more readily connected in the percolating network than the well-dispersed P-SWNTs.
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