Evaluation of Mechanical Properties in Nanocomposites Containing Carbon Nanotubes Below and Above Percolation Threshold

Zare, Yasser; Rhee, Kyong Yop

doi:10.1007/s11837-017-2294-x

Cited by 6 publications

(2 citation statements)

References 30 publications

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“…In these cases, the percolation threshold may lead to less energy dissipation during crack growth, since these interphases may act as a region of weakness for mechanical properties 49 . As the percolation threshold in nanocomposites indicates the minimum concentration of a nanomaterial necessary to form a kind of continuous path network 50 , this amount may not be enough to guarantee that reinforcement occurs. Instead, stress and strain have this weak region be distributed, as yield strength presents a drop in value, due to a reduction of constraints on the polymer network 51 .…”

Section: Mechanical Properties and Digital Image Correlationmentioning

confidence: 99%

Percolation Threshold and Depression in Properties of Polymer Nanocomposites

et al. 2022

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Percolation threshold is an important phenomenon to be addressed when producing nanocomposites, especially because the literature suggests a depression of properties near this region. In this study, epoxy matrix nanocomposites were produced with different volume fractions of multi-walled carbon nanotubes and were characterized according to their electrical, thermal, and mechanical properties. In addition, digital image correlation (DIC) was used to measure the strain of nanocomposites and to show how it behaves in different percolation states. Electrical conductivity indicated a percolation threshold near 0.22% v/v of nanoparticles. Differential scanning calorimetry analysis showed a depression followed by an increase in glass transition temperature near the percolation threshold. Tensile strength tests presented a depression followed by an increasing near percolation threshold. DIC images showed that nanocomposites present a different behavior when near the percolation threshold, with a more distributed strain over the surface of the sample under stress and fracture toughness decreased near the percolation threshold.

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Section: Mechanical Properties and Digital Image Correlationmentioning

confidence: 99%

Percolation Threshold and Depression in Properties of Polymer Nanocomposites

et al. 2022

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“…Similarly, in the present work, a threshold of the SSAMs for forming an aerohydrogel also exists, which could be well evaluated from the change of the physical properties, such as storage modulus and Young's modulus. 30,31 As shown in Figure S5, the storage modulus (G′) of the as-synthesized gels increases with the increase in the weight content of SSAMs. Interestingly, the relationship between G′ of the as-synthesized gels and SSAMs loading at the frequency of 1 Hz shown in Figure 1b exhibits that G′ increases steadily as the SSAM content increases.…”

Section: ■ Results and Discussionmentioning

confidence: 93%

Solid–Liquid–Vapor Triphase Gel

Wang

Sheng

et al. 2021

Langmuir

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Gels are soft functional materials with solid networks and open pores filled with solvents (for wet gels) or air (for aerogels), displaying broad applications in tissue engineering, catalysis, environmental remediation, energy storage, etc. However, currently known gels feature only a single (either solid–liquid or solid–vapor) interface, largely limiting their application territories. Therefore, it is both fundamentally intriguing and practically significant to develop conceptually new gel materials that possess solid–liquid–vapor multiple interfaces. Herein, we demonstrate a unique solid–liquid–vapor triphase gel, named as aerohydrogel, by gelling of a poly(vinyl alcohol) aqueous solution with glutaraldehyde in the presence of superhydrophobic silica aerogel microparticles. Owing to its continuous solid, liquid, and vapor phases, the resultant aerohydrogel simultaneously displays solid–liquid, solid–vapor, and liquid–vapor interfaces, leading to excellent properties including tunable density (down to 0.43 g·cm–3), considerable hydrophobicity, and excellent elasticity (compressive ratio of up to 80%). As a proof-of-concept application, the aerohydrogel exhibits a higher evaporative cooling efficiency than its hydrogel counterpart and a better cooling capability than the commercial phase change cooling film, respectively, showing promising performance in cooling various devices. Moreover, the resulting aerohydrogel could be facilely tailored with specific (e.g., magnetic) properties for emerging applications such as solar steam generation. This work extends biphase gel (hydrogel or aerogel) to solid–liquid–vapor triphase gel, as well as provides a promising strategy for designing more aerohydrogels serving as soft functional materials for applications in various emerging fields.

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Evaluation of the Tensile Strength in Carbon Nanotube-Reinforced Nanocomposites Using the Expanded Takayanagi Model

Zare

Rhee

2019

JOM

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Evaluation of Mechanical Properties in Nanocomposites Containing Carbon Nanotubes Below and Above Percolation Threshold

Cited by 6 publications

References 30 publications

Percolation Threshold and Depression in Properties of Polymer Nanocomposites

Percolation Threshold and Depression in Properties of Polymer Nanocomposites

Solid–Liquid–Vapor Triphase Gel

Evaluation of the Tensile Strength in Carbon Nanotube-Reinforced Nanocomposites Using the Expanded Takayanagi Model

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