Investigation of Electrically Conductive Structural Adhesives using Nickel Nanostrands

Hansen, Nathan; Adams, Daniel O.; DeVries, K. Lawrence; Goff, Adam; Hansen, George

doi:10.1163/016942411x556033

Cited by 12 publications

(8 citation statements)

References 7 publications

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“…The polymers studied are widely available commercial products described in Table . These polymers have the advantage of being easy to use, relevant to commercial applications, and previously studied in Ni‐Ns nanocomposite systems . The dielectric measurements required polymers which contained dispersed Ni‐Ns, forming a percolating conductive nanocomposite.…”

Section: Experimentationmentioning

confidence: 99%

Characterization of nickel nanostrand nanocomposites through dielectric spectroscopy and nanoindentation

Koecher

Yeager

Park

et al. 2013

Polymer Engineering & Sci

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One particularly promising model of electrical properties of conductive nanocomposites involves a combined quantum tunneling/percolation approach. However, two key inputs to the model-the polymer matrix barrier height and the average gap between conductive filler particles-are difficult to determine experimentally. This article demonstrates improved methods for determining barrier height in polymer materials via conductive nanoindentation, with barrier heights measured between 0.4 and 1.7 eV for five different polymers. By using dielectric spectroscopy techniques, combined with the barrier height measurements, the average junction gap was determined for the first time for nickel-nanostrand nanocomposites with six different polymer matrices; the values range from 1.31 to 3.28 nm. Using those measured values for barrier height and junction gap distances in a simple model, we have tested predictions for bulk resistivity of six polymers. The model worked well for four of the six, which suggests that for a given volume fraction of filler, knowledge of the barrier height and the junction distance may in many cases be sufficient to provide an estimate of the bulk resistivity of the polymer-nanostrand blend, an important parameter in nanocomposite engineering.

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Section: Experimentationmentioning

confidence: 99%

Characterization of nickel nanostrand nanocomposites through dielectric spectroscopy and nanoindentation

Koecher

Yeager

Park

et al. 2013

Polymer Engineering & Sci

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“…Nickel nanostrands (NiNs) display a high strand aspect ratio and a bifurcated structure that allows conductivity of a nanocomposite to be obtained at small volume fractions of nanostrands [21]. When combined with a polymer matrix they form a piezo-resistive material that has been used as the basis for strain sensors [22].…”

Section: Methodsmentioning

confidence: 99%

Piezoresistive in-situ strain sensing of composite laminate structures

Koecher

Pande

Merkley

et al. 2015

Composites Part B: Engineering

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“…The polymers chosen for this study are widely available commercial systems, as detailed in Table . These systems were chosen for ease of use, relevance to commercial applications, and correlation to previous data . All polymers were used in their as‐received state and prepared according to the manufacturer recommendations.…”

Section: Methodsmentioning

confidence: 99%

Evaluation and development of electrical conductivity models for nickel nanostrand polymer composites

2014

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The electrical conductivity of composites and polymeric‐based systems is frequently improved by the addition of conductive additives to form a conductor–insulator binary system. This study considers nickel nanostrands as a conductive element in polymer systems. Materials characteristics are considered in order to form a basis for understanding and predicting the electrical percolation behaviors of nanostrand composites, specifically seeking models that can distinguish between different polymer systems. Empirical percolation data for nickel nanostrands in four different polymeric systems is presented and used to evaluate candidate electrical conductivity models. Classical percolation approaches are found to not show good fit, but more advanced models are able to provide good correlation to tested results. Specifically, Tunneling Percolation (TPM) models and the Two Exponent Phenomenological Percolation Equation (TEPPE) model based on the Generalized Effective Media (GEM) theory show good fit. A combined TEPPE‐TPM approach is developed that applies tunneling percolation to the GEM theory. This combined model includes tunneling considerations in equations that accurately represent behaviors in all regions of percolation behavior. POLYM. ENG. SCI., 55:549–557, 2015. © 2014 Society of Plastics Engineers

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Investigation of Electrically Conductive Structural Adhesives using Nickel Nanostrands

Cited by 12 publications

References 7 publications

Characterization of nickel nanostrand nanocomposites through dielectric spectroscopy and nanoindentation

Characterization of nickel nanostrand nanocomposites through dielectric spectroscopy and nanoindentation

Piezoresistive in-situ strain sensing of composite laminate structures

Evaluation and development of electrical conductivity models for nickel nanostrand polymer composites

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