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The influence of the dispersion method on the electrical properties of vapor-grown carbon nanofiber/epoxy composites.

Cardoso P, Silva J, Klosterman D, Covas JA, van Hattum FW, Simoes R, Lanceros-Mendez S - Nanoscale Res Lett (2011)

Bottom Line: The influence of the dispersion of vapor-grown carbon nanofibers (VGCNF) on the electrical properties of VGCNF/Epoxy composites has been studied.A homogenous dispersion of the VGCNF does not imply better electrical properties.In fact, it is demonstrated that the most simple of the tested dispersion methods results in higher conductivity, since the presence of well-distributed nanofiber clusters appears to be a key factor for increasing composite conductivity.PACS: 72.80.Tm; 73.63.Fg; 81.05.Qk.

View Article: PubMed Central - HTML - PubMed

Affiliation: IPC/I3N--Institute for Polymers and Composites, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal. rsimoes@dep.uminho.pt.

ABSTRACT
The influence of the dispersion of vapor-grown carbon nanofibers (VGCNF) on the electrical properties of VGCNF/Epoxy composites has been studied. A homogenous dispersion of the VGCNF does not imply better electrical properties. In fact, it is demonstrated that the most simple of the tested dispersion methods results in higher conductivity, since the presence of well-distributed nanofiber clusters appears to be a key factor for increasing composite conductivity.PACS: 72.80.Tm; 73.63.Fg; 81.05.Qk.

No MeSH data available.


Related in: MedlinePlus

Cross section SEM images for the 0.006 volume fraction samples.
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Figure 1: Cross section SEM images for the 0.006 volume fraction samples.

Mentions: The level of VGCNF distribution and dispersion in the matrix achieved by the four preparation methods was estimated from SEM images; see Figure 1. Methods 1 and 2 seem to have produced composites with some agglomeration of the nanofibers, but with a relative good distribution of the clusters (Figure 1, top left and top right). Method 3 yields a homogeneous mix (Figure 1, bottom left). Conversely, Method 4 generates poor dispersion and the worst distribution as compared with the other methods (Figure 1, bottom right). The large clusters are hollow, with the matrix clearly visible in their interior. The concept of dispersion is related to the formation of filler agglomerates/clusters in the domain; a good dispersion implies the fillers are well separated in the domain. In this study, we also consider the distribution of agglomerates/clusters in the domain; a uniform distribution of the agglomerates/clusters throughout the matrix is said to be a good cluster distribution. A sketch of distribution and dispersion concepts can be found in [3].


The influence of the dispersion method on the electrical properties of vapor-grown carbon nanofiber/epoxy composites.

Cardoso P, Silva J, Klosterman D, Covas JA, van Hattum FW, Simoes R, Lanceros-Mendez S - Nanoscale Res Lett (2011)

Cross section SEM images for the 0.006 volume fraction samples.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211461&req=5

Figure 1: Cross section SEM images for the 0.006 volume fraction samples.
Mentions: The level of VGCNF distribution and dispersion in the matrix achieved by the four preparation methods was estimated from SEM images; see Figure 1. Methods 1 and 2 seem to have produced composites with some agglomeration of the nanofibers, but with a relative good distribution of the clusters (Figure 1, top left and top right). Method 3 yields a homogeneous mix (Figure 1, bottom left). Conversely, Method 4 generates poor dispersion and the worst distribution as compared with the other methods (Figure 1, bottom right). The large clusters are hollow, with the matrix clearly visible in their interior. The concept of dispersion is related to the formation of filler agglomerates/clusters in the domain; a good dispersion implies the fillers are well separated in the domain. In this study, we also consider the distribution of agglomerates/clusters in the domain; a uniform distribution of the agglomerates/clusters throughout the matrix is said to be a good cluster distribution. A sketch of distribution and dispersion concepts can be found in [3].

Bottom Line: The influence of the dispersion of vapor-grown carbon nanofibers (VGCNF) on the electrical properties of VGCNF/Epoxy composites has been studied.A homogenous dispersion of the VGCNF does not imply better electrical properties.In fact, it is demonstrated that the most simple of the tested dispersion methods results in higher conductivity, since the presence of well-distributed nanofiber clusters appears to be a key factor for increasing composite conductivity.PACS: 72.80.Tm; 73.63.Fg; 81.05.Qk.

View Article: PubMed Central - HTML - PubMed

Affiliation: IPC/I3N--Institute for Polymers and Composites, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal. rsimoes@dep.uminho.pt.

ABSTRACT
The influence of the dispersion of vapor-grown carbon nanofibers (VGCNF) on the electrical properties of VGCNF/Epoxy composites has been studied. A homogenous dispersion of the VGCNF does not imply better electrical properties. In fact, it is demonstrated that the most simple of the tested dispersion methods results in higher conductivity, since the presence of well-distributed nanofiber clusters appears to be a key factor for increasing composite conductivity.PACS: 72.80.Tm; 73.63.Fg; 81.05.Qk.

No MeSH data available.


Related in: MedlinePlus