Multi-scaled carbon reinforcements in ternary epoxy composite materials: Dispersion and electrical impedance study

Baltzis, D.; Bekas, D.G.; Tzachristas, G.; Parlamas, A.; Karabela, Maria M.; Zafeiropoulos, Nikolaos E.; Paipetis, Alkiviadis S.

doi:10.1016/j.compscitech.2017.09.035

Cited by 29 publications

(27 citation statements)

References 41 publications

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“…% did not alter the electrical behavior of the system. Additionally, as previous studies have indicated [14,30], electrical percolation is reached at ca. 0.5 wt.…”

Section: Dispersion Protocolssupporting

confidence: 60%

“…The authors in this study used a two-part epoxy resin system, namely the LY5052 resin and the Aradur 5052 hardener, with Multi Walled Carbon Nano Tubes (MWCNTs) and milled CB. This composite system exhibited improved electrical and mechanical properties due to the exploitation of the synergistic effects of the different scale fillers in comparison to the composites reinforced by a single filler [14]. Furthermore, according to some studies, the enhanced properties of the nanocomposites with the same loading of nano-and micro-materials differs if the host type of the matrix is dissimilar [36,37].…”

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confidence: 99%

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The Role of Synergies of MWCNTs and Carbon Black in the Enhancement of the Electrical and Mechanical Response of Modified Epoxy Resins

et al. 2019

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Nano-reinforced composites are widely studied by the scientific community. The main factors affecting the final nanocomposite performance are the filler type and content, as well as the duration of the dispersion. In this work, we report the effects of Multi-Walled Carbon Nano Tubes (MWCNTs) and milled Carbon Black (CB) dispersion in epoxy resin on the electrical and mechanical properties of the resulting composites. Impedance Spectroscopy (IS) was utilized to assess the dielectric properties of the specimens. The mechanical properties were evaluated by fracture toughness tests, while Scanning Electron Microscopy (SEM) was performed to study the influence of the reinforcement on the failure mechanisms acting on the fracture surfaces of the specimens. IS results for epoxy/CNT systems revealed the creation of a 3D conductive network for concentrations above 0.3 wt. %, while CB did not result in the formation of such a network for filler contents up to 2 wt. %. However, the synergistic effect of CNTs/CB was successfully manifested by both the optimal electrical properties and the 81% enhanced fracture toughness in comparison to the neat resin. Fractography confirmed the aforementioned results and revealed the fracture mechanisms of all systems, such as crack pinning and deflection, and particle pull-out phenomena.

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“…% did not alter the electrical behavior of the system. Additionally, as previous studies have indicated [14,30], electrical percolation is reached at ca. 0.5 wt.…”

Section: Dispersion Protocolssupporting

confidence: 60%

mentioning

confidence: 99%

The Role of Synergies of MWCNTs and Carbon Black in the Enhancement of the Electrical and Mechanical Response of Modified Epoxy Resins

et al. 2019

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“…The dispersion method, duration and intensity was constant for all formulations, employing high speed shear mixing at 3000rpm for 3h.The dispersion parameters were selected on the basis of the maximum fracture toughness observed for the binary CNT composites in a previous study. Further details on the dispersion procedure can be found in [9]. After the dispersion, all epoxies were mixed with the respective quantity (100/30 by weight ratio), applied with a thin brush on anodised aluminum substrates, cured at 250C for 24h and post cured at 1000C for 4h.…”

Section: Methodsmentioning

confidence: 99%

“…In order to further enhance adhesion and alleviate the mismatches, several studies have been conducted on nano-modified epoxies employing mainly graphitic structures like carbon nano tubes (CNTs) [4][5][6][7][8]. Apart from the improved adhesion, CNTs can also reduce the ingress of water in the epoxy due to their hydrophobic nature and the water affected specific area resulting in more tortuous paths for the absorption and diffusion of water, thus, further enhancing the performance of the joint structure [9][10][11]. In addition, the CNTs can significantly enhance the electrical conductivity of the insulating epoxy, thus abating the conductivity mismatch between aluminum substrate and coating.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission Feasibility Study for Carbon Epoxy Coated Aluminum Corrosion Monitoring

Baltzis¹,

Evaggelou²,

Lekatou³

et al. 2018

Int J Metall Mater Eng

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In the presented research effort, cyclic polarization tests were conducted coupled with acoustic emission measurements, in order to monitor the corrosion phenomena. Previous studies have shown that epoxy composite coatings offer satisfactory corrosion protection to aluminum substrates minimizing and even eliminating some degradation phenomena. In the present effort, acoustic emission was applied during potentiodynamic cyclic polarization testing on as received, anodized and carbon epoxy coated aluminum substrates in order to correlate corrosion phenomena, like oxide layer development and localized corrosion, with characteristic acoustic emission signal descriptors. The epoxy coating was used both as received and as reinforced with various carbon fillers i.e. carbon nano-tubes, amorphous graphite or a combination of them. Acoustic emission detected signals due to hydrogen bubble related processes during cathodic polarization and signals due to deposition of thick soluble films during the final stage of anodic polarization. The acoustic profile between coated and uncoated aluminum substrates, exhibited substantial changes dependent both on the surface preparation and the employed reinforcing filler. The overall outcome of the experimental results, indicate that with further research, acoustic emission can be employed as an Aluminum Corrosion Monitoring tool.

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“…This would be reflected by an increase in the impedance. The optimum dispersion conditions that exhibited high conductivity, medium viscosity and could enable the SHM mapping, were selected based on previous research [32,36]. Consequently, 0.5% w/w MWCNTs and 2% w/w CB were dispersed in the epoxy resin (part A) at 3000 revolutions per minute (rpm) at 25 °C.…”

Section: Composites Manufacturingmentioning

confidence: 99%

A Novel Composite with Structural Health Monitoring Functionality via 2D and 3D Impedance Mapping Topography

Foteinidis

Paipetis

2021

Applied Sciences

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We report the transformation of a conventional composite material into a multifunctional structure able to provide information about its structural integrity. A purposely positioned grid of carbon fabric strips located within a glass fibre laminate in alternating 0/90 configuration combined with a ternary nanomodified epoxy matrix imparted structural health monitoring (SHM) topographic capabilities to the composite using the impedance spectroscopy (IS) technique. The matrix was reinforced with homogenously dispersed multi-walled carbon nanotubes (MWCNTs) and carbon black (CB). A sinusoidal electric field was applied locally over a frequency range from 1 Hz to 100 kHz between the junction points of the grid of carbon fabric strips. The proposed design enabled topographic damage assessment after a high-velocity impact via the local monitoring of the impedance. The data obtained from the IS measurements were depicted by magnitude and phase delay Bode plots and Nyquist plots. The impedance values were used to create a 2D and a multi-layer (3D) contour topographical image of the damaged area, which revealed crucial information about the structural integrity of the composite.

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Multi-scaled carbon reinforcements in ternary epoxy composite materials: Dispersion and electrical impedance study

Cited by 29 publications

References 41 publications

The Role of Synergies of MWCNTs and Carbon Black in the Enhancement of the Electrical and Mechanical Response of Modified Epoxy Resins

The Role of Synergies of MWCNTs and Carbon Black in the Enhancement of the Electrical and Mechanical Response of Modified Epoxy Resins

Acoustic Emission Feasibility Study for Carbon Epoxy Coated Aluminum Corrosion Monitoring

A Novel Composite with Structural Health Monitoring Functionality via 2D and 3D Impedance Mapping Topography

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