Electrical properties of single-wall carbon nanotube and epoxy composites

Kim, Bum Suk; Lee, Dong Kun; Yu, In Kyu

doi:10.1063/1.1622772

Cited by 164 publications

(84 citation statements)

References 15 publications

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“…Therefore, the critical exponent values are believed to be within the range of 0.2 to 0.4, with the uncertainty attributed to the difference in geometry between the bond, site, and continuum percolation problems that may result in different properties of the clusters. For CNT composites, the critical exponent of 0.34, consistent with percolation theory, is obtained (Kim, et al, 2003). In all cases, x is less than 1.…”

Section: Theorysupporting

confidence: 58%

Microwave Dielectric Properties of Carbon Nanotube Composites

Liu¹,

Kong²,

Wang³

et al. 2010

Carbon Nanotubes

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Section: Theorysupporting

confidence: 58%

Microwave Dielectric Properties of Carbon Nanotube Composites

Liu¹,

Kong²,

Wang³

et al. 2010

Carbon Nanotubes

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“…Once percolation is achieved, however, we find enormous increases in the low frequency permittivities, as expected for materials exhibiting conductive behavior. Interfacial polarization at the surface of the SWCNTs is responsible for this increase at low frequencies and a similar observation has been reported elsewhere 21,22 . An order of magnitude increase in the permittivity is observed between the pure polymer (2.95) and the 0.75 wt% sample (35.48) at 1 kHz.…”

supporting

confidence: 67%

Thermodynamic approach to enhanced dispersion and physical properties in a carbon nanotube/polypeptide nanocomposite

Lovell

Wise

Kim

et al. 2009

Polymer

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A high molecular weight synthetic polypeptide has been designed which exhibits favorable interactions with single wall carbon nanotubes (SWCNTs). The enthalpic and entropic penalties of mixing between these two molecules are reduced due to the polypeptide's aromatic sidechains and helical secondary structure, respectively. These enhanced interactions result in a well dispersed SWCNT/Poly ( L -Leucine-ran-L -Phenylalanine) nanocomposite with enhanced mechanical and electrical properties using only shear mixing and sonication. At 0.5 wt% loading of SWCNT filler, the nanocomposite exhibits simultaneous increases in the Young's modulus, failure strain, and toughness of 8%, 120%, and 144%, respectively. At one kHz, the same nanotube loading level also enhances the dielectric constant from 2.95 to 22.81, while increasing the conductivity by four orders of magnitude.Keywords: copolypeptide, single wall carbon nanotube (SWCNT), nanotube/polymer interactions, nanotube/polymer nanocomposite Next generation aerospace applications will demand strong and lightweight materials that offer additional intrinsic functionalities such as electrical conductivity, sensing, or actuation. Incorporation of single wall carbon nanotubes (SWCNTs) into certain high performance polymers yields a lightweight material with dramatically improved mechanical and electrical properties that also exhibits sensing and actuating behavior 1,2 . Achieving these improved properties depends on the SWCNTs being 1 https://ntrs.nasa.gov/search.jsp?R=20090017801 2018-05-09T15:57:46+00:00Z

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“…Recent successes include preparing fibers and ribbons of SWNTs; [2] films of pure SWNTs, [3,4] polymers doped with SWNTs, [5,6] and growth in situ of SWNT arrays. [7] Evaporation of drops on substrates has been used for patterned deposition of solutes onto non-porous substrates, such as in DNA microarrays, [8] nanolithography, [9] protein crystallization, [10] and stretching DNA for hybridization studies.…”

mentioning

confidence: 99%

Self‐Assembly of Single‐Walled Carbon Nanotubes into a Sheet by Drop Drying

2005

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Single-walled carbon nanotubes (SWNTs) are currently the focus of extensive interdisciplinary studies because of their unique physical and chemical properties and potential electronic applications, for example, in making sensors and fieldemission devices.[1] Processing of SWNT-based materials into engineered macroscopic materials is still in its infancy; the most successful methods so far have been based on adapting techniques that had been developed in other areas of material science such as colloids and polymers. Recent successes include preparing fibers and ribbons of SWNTs; [2] films of pure SWNTs, [3,4] polymers doped with SWNTs, [5,6] and growth in situ of SWNT arrays. [7] Evaporation of drops on substrates has been used for patterned deposition of solutes onto non-porous substrates, such as in DNA microarrays, [8] nanolithography, [9] protein crystallization, [10] and stretching DNA for hybridization studies. [11,12] Shimoda et al. [13] prepared continuous selfassembled films of SWNT bundles on glass near a receding contact line by solvent evaporation. The moving contact line of a drying drop could be similarly used to form aligned patterns of SWNTs on substrates for making films or for nanofabrication. Drops of a solution on a substrate follow one of two drying mechanisms: either the drop maintains a constant contact angle by de-pinning the contact line (e.g., water on non-wetting substrates [14] ), or the contact line gets pinned and the drop maintains a fixed contact area (e.g., colloidal dispersions [15] ).Deegan and co-workers [15][16][17] have studied the drying of drops of colloidal dispersions and found that the particles deposit in a ring at the periphery of the drop due to capillary flow in which the pinned contact line causes the solvent to flow towards the edge. Recent investigations have also shown the formation of a skin or crust at the free surface of drops of polymers and colloidal suspensions. [18,19] Pauchard and Allain [19] found that the crust may collapse and evolve into different shapes as the surface area remains constant while the drop volume decreases due to solvent evaporation. "Crusting" on the surface of spin-cast films [20,21] is a well-known phenomenon.De Gennes [22] suggested a transport model for crust formation in spin-cast films. Because the glass-transition or gelation temperature of a pure polymer/colloid is higher than that in solution, [19] at any temperature below the glass transition there is a critical particle concentration at which the system transitions from fluid to glassy or gel-like. Evaporation of solvent from the free surface leads to a local increase in concentration of the polymer/suspension at the free surface, and a very thin glassy or gelled crust is formed at the free surface. Here, we investigated drying of a sessile drop of individually suspended SWNTs in an aqueous solution of F68 Pluronic. We found that, instead of assembling on the substrate, the SWNTs selfassemble into a crust at the free surface. This entangled meshlike crust was characterized b...

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Electrical properties of single-wall carbon nanotube and epoxy composites

Cited by 164 publications

References 15 publications

Microwave Dielectric Properties of Carbon Nanotube Composites

Microwave Dielectric Properties of Carbon Nanotube Composites

Thermodynamic approach to enhanced dispersion and physical properties in a carbon nanotube/polypeptide nanocomposite

Self‐Assembly of Single‐Walled Carbon Nanotubes into a Sheet by Drop Drying

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