Unique Identification of Single-Walled Carbon Nanotubes in Electrospun Fibers

Deng, Libo; Young, Robert J.; Sun, Rong; Zhang, Guoping; Lu, Daoqiang; Li, Hui; Eichhorn, Stephen J.

doi:10.1021/jp504176b

Cited by 4 publications

(3 citation statements)

References 38 publications

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“…This has been true for both PS/ CNC and PVA/CNC fibres regardless of the differences in electrospinning conditions and fibre diameters. Previous work has shown that single-walled carbon nanotubes (SWNTs) can be oriented in electrospun PVA fibres [23][24][25]. Given that the lateral sizes of CNCs and SWNTS are similar, it is surprising that orientation is not achieved with the present system.…”

Section: Raman Spectroscopic Characterization Of Cnc Orientationmentioning

confidence: 76%

Orientation of cellulose nanocrystals in electrospun polymer fibres

et al. 2015

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Polystyrene and poly(vinyl alcohol) nanofibres containing cellulose nanocrystals (CNCs) were successfully produced by electrospinning. Knowledge of the local orientation of CNCs in electrospun fibres is critical to understand and exploit their mechanical properties. The orientation of CNCs in these electrospun fibres was investigated using transmission electron microscopy (TEM) and Raman spectroscopy. A Raman band located at *1095 cm -1 , associated with the C-O ring stretching of the cellulose backbone, was used to quantify the orientation of the CNCs within the fibres. Raman spectra were fitted using a theoretical model to characterize the extent of orientation. From these data, it is observed that the CNCs have little orientation along the direction parallel to the axis of the fibres. Evidences for both oriented and nonoriented regions of CNCs in the fibres are presented from TEM images of nanofibres. These results contradict previously published work in this area and micromechanical modelling calculations suggest a uniform orientation of CNCs in electrospun polymer fibres. It is demonstrated that this explains why the mechanical properties of electrospun fibre mats containing CNCs are not always the same as that would be expected for a fully oriented system.

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Section: Raman Spectroscopic Characterization Of Cnc Orientationmentioning

confidence: 76%

Orientation of cellulose nanocrystals in electrospun polymer fibres

et al. 2015

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“…When the angle between the polarization direction of the laser and the axis of CNT changes, the intensity of the polarized Raman spectrum for CNTs that have a certain degree of orientation will be varied; 28,29 however, that for CNTs with random distribution almost does not change. 30 Figure 5 gives polarized Raman spectra of m-CNT0.3/EP and t-CNT0.3/EP composites, in which 0°, 30°, 60°, and 90°are polarization angles. The Gband 31 of CNTs appears at 1610 cm −1 in each spectrum, however, the intensity of the G-band is increased and then decreased as the polarization angle increases in the spectra of m-CNT0.3/EP composites.…”

Section: Resultsmentioning

confidence: 99%

“…Polarized Raman spectra can be used to characterize the orientation of CNTs in composites. When the angle between the polarization direction of the laser and the axis of CNT changes, the intensity of the polarized Raman spectrum for CNTs that have a certain degree of orientation will be varied; , however, that for CNTs with random distribution almost does not change Figure gives polarized Raman spectra of m-CNT0.3/EP and t-CNT0.3/EP composites, in which 0°, 30°, 60°, and 90° are polarization angles.…”

Section: Results and Discussionmentioning

confidence: 99%

Origin of Increasing Dielectric Constant at Lower Percolation Threshold through Controlling Spatial Distribution of Carbon Nanotubes in Epoxy Resin with Microwave-Assisted Thermal Curing Technique

Liu¹,

Zheng²,

Yuan³

et al. 2016

J. Phys. Chem. C

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How to fabricate polymer composites with higher dielectric constant at lower content of conductors based on commercial compositions is still an interesting topic with great challenge. Herein, based on multiwalled carbon nanotubes (CNTs) and epoxy resin (EP), new high dielectric constant (high-k) composite (m-CNT/EP) with much higher permittivity and lower percolation threshold (f c) was prepared by a microwave-assisted thermal curing technology. Results show that the spatial structure and performances of CNT/EP composites are dependent on the curing process used. CNTs are orientated along the Z direction in m-CNT/EP composites, while they are randomly permutated in the composite (t-CNT/EP) produced with a traditional thermal curing procedure. Accordingly, t-CNT/EP composites have isotropic dielectric properties, and m-CNT/EP composites exhibit anisotropic dielectric properties. f c values of m-CNT/EP composites in the X, Y, and Z directions are 0.29, 0.29, and 0.24 wt %, respectively, while those of t-CNT/EP composites are equal to 0.39 wt %. When the loading of CNTs is 0.25 wt %, the dielectric constant in the Z direction of m-CNT0.25/EP is as high as 673, about 20.7 times of that of t-CNT0.25/EP. The origin behind these interesting results is discussed from building the relationship between CNT distribution and dielectric properties using finite elements and simulating equal circuits.

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Formation of Poly(vinyl alcohol)/SWNTs Fibers with Hierarchical Structure under High-Speed Shear Flow

Wang

Sun

et al. 2020

Fibers Polym

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Unique Identification of Single-Walled Carbon Nanotubes in Electrospun Fibers

Cited by 4 publications

References 38 publications

Orientation of cellulose nanocrystals in electrospun polymer fibres

Orientation of cellulose nanocrystals in electrospun polymer fibres

Origin of Increasing Dielectric Constant at Lower Percolation Threshold through Controlling Spatial Distribution of Carbon Nanotubes in Epoxy Resin with Microwave-Assisted Thermal Curing Technique

Formation of Poly(vinyl alcohol)/SWNTs Fibers with Hierarchical Structure under High-Speed Shear Flow

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