Anisotropic elasticity and abnormal Poisson’s ratios in super-hard materials

Huang, Chuanwei; Li, Rongpeng; Chen, Lang

doi:10.1063/1.4904100

Cited by 4 publications

(5 citation statements)

References 37 publications

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“…Indeed, several pioneering reports showed that the magnitude of the Poisson's ratio changes with crystal direction, and negative values can arise among certain orientations even in simple cubic metallic materials. Particularly, it is predicted that negative Poisson's ratios occur along the

[110, 1 \bar{1} 0]

direction in most of cubic metals ( Figure a), which has been experimentally demonstrated in cubic iron‐based alloys . Meanwhile, a rigid octahedral mode (Figure b) is proposed to explain the orientation‐dependent negative Poisson's ratios (minima ν along

[110, 1 \bar{1} 0]

) in cubic materials.…”

Section: Negative Poisson's Ratios In Functional Materialsmentioning

confidence: 92%

“…Meanwhile, a rigid octahedral mode (Figure b) is proposed to explain the orientation‐dependent negative Poisson's ratios (minima ν along

[110, 1 \bar{1} 0]

) in cubic materials. Furthermore, other reports have focused on the orientation‐dependent negative Poisson's ratios in a variety of functional materials, no matter what the crystal symmetry of the materials is . Nevertheless, these negative Poisson's ratios only occur along non‐principal directions for all of these bulk materials, which largely hinders their experimental observations and potential applications.…”

Section: Negative Poisson's Ratios In Functional Materialsmentioning

confidence: 99%

“…However, negative mechanical properties are often not found along the principal crystallographic axes in anisotropic materials . To obtain orientation‐dependent elastic compliances and Poisson's ratio, one must perform an angular transformation of axes for s ijkl .…”

Section: Introductionmentioning

confidence: 99%

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Negative Poisson's Ratio in Modern Functional Materials

2016

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Materials with negative Poisson's ratio attract considerable attention due to their underlying intriguing physical properties and numerous promising applications, particularly in stringent environments such as aerospace and defense areas, because of their unconventional mechanical enhancements. Recent progress in materials with a negative Poisson's ratio are reviewed here, with the current state of research regarding both theory and experiment. The inter-relationship between the underlying structure and a negative Poisson's ratio is discussed in functional materials, including macroscopic bulk, low-dimensional nanoscale particles, films, sheets, or tubes. The coexistence and correlations with other negative indexes (such as negative compressibility and negative thermal expansion) are also addressed. Finally, open questions and future research opportunities are proposed for functional materials with negative Poisson's ratios.

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[110, 1 \bar{1} 0]

[110, 1 \bar{1} 0]

) in cubic materials.…”

Section: Negative Poisson's Ratios In Functional Materialsmentioning

confidence: 92%

“…Meanwhile, a rigid octahedral mode (Figure b) is proposed to explain the orientation‐dependent negative Poisson's ratios (minima ν along

[110, 1 \bar{1} 0]

Section: Negative Poisson's Ratios In Functional Materialsmentioning

confidence: 99%

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Negative Poisson's Ratio in Modern Functional Materials

2016

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“…Interestingly, the maximum value of PR in InTeI is 0.55, which is slightly greater than the upper limit of 0.5 in an isotropic material but nevertheless allowed for anisotropic systems. 53,54 The significant difference between the minimum and maximum values of PR in both the monolayers can lead them to potential applications in elastic-related sensing devices.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Unconventional Anisotropy in Excitonic Properties and Carrier Mobility in Iodine-Based XTeI (X = Ga, In) Monolayers for Visible-Light Photocatalytic Water Splitting

Kishore¹,

Tripathy²,

Sarkar³

2023

J. Phys. Chem. C

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Two-dimensional materials for efficient visible-light-driven photocatalytic water splitting after the era of TiO2 and other metal oxides are scarce. Recent years have witnessed an upsurge in the research of nonoxide semiconductors for overall photocatalytic water splitting. Herein, XTeI (X = Ga, In) monolayers are demonstrated to be stable water-splitting photocatalysts. Merely 0.1 (0.03) V of additional voltage is required to drive the oxidation evolution reaction by the GaTeI (InTeI) monolayer. As these monolayers exhibit a higher valence band position than traditional metal oxides, implying a narrower band gap, they are suitable as efficient visible-light-driven photocatalysts with an absorption coefficient of ∼10–5 cm–1 in the visible range of the solar spectrum. Anisotropic carrier mobilities favor charge separation and reduce their recombination. Exciton properties have been analyzed in-depth via GW approximation. Exciton spatial extension and exciton binding energy are found to exhibit a highly anisotropic nature. The exciton binding energies of GaTeI and InTeI on different substrates, like SiO2 and h-BN, range from ∼14 meV to ∼0.2 eV, which are even smaller than those in TMDs. These facilitate easier charge separation, making them favorable photocatalysts.

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“…Previous studies have also shown that the PR is highly sensitive to anisotropy index, 42,43 and the PR higher than 0.5 in some materials could be attributed to the anisotropic behavior. 44 Picu et al 45 have shown that changes in the PR are associated with the fiber orientation in soft collagenous tissues.…”

Section: Discussionmentioning

confidence: 88%

The effect of large deformation on Poisson’s ratio of brain white matter: An experimental study

Eskandari

Rahmani

Shafieian

2020

Proc Inst Mech Eng H

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A more Accurate description of the mechanical behavior of brain tissue could improve the results of computational models. While most studies have assumed brain tissue as an incompressible material with constant Poisson’s ratio of almost 0.5 and constructed their modeling approach according to this assumption, the relationship between this ratio and levels of applied strains has not yet been studied. Since the mechanical response of the tissue is highly sensitive to the value of Poisson’s ratio, this study was designed to investigate the characteristics of the Poisson’s ratio of brain tissue at different levels of applied strains. Samples were extracted from bovine brain tissue and tested under unconfined compression at strain values of 5%, 10%, and 30%. Using an image processing method, the axial and transverse strains were measured over a 60-s period to calculate the Poisson’s ratio for each sample. The results of this study showed that the Poisson’s ratio of brain tissue at strain levels of 5% and 10% was close to 0.5, and assuming brain tissue as an incompressible material is a valid assumption at these levels of strain. For samples under 30% compression, this ratio was higher than 0.5, which could suggest that under strains higher than the brain injury threshold (approximately 18%), tissue integrity was impaired. Based on these observations, it could be concluded that for strain levels higher than the injury threshold, brain tissue could not be assumed as an incompressible material, and new material models need to be proposed to predict the material behavior of the tissue. In addition, the results showed that brain tissue under unconfined compression uniformly stretched in the transverse direction, and the bulging in the samples is negligible.

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Anisotropic elasticity and abnormal Poisson’s ratios in super-hard materials

Cited by 4 publications

References 37 publications

Negative Poisson's Ratio in Modern Functional Materials

Negative Poisson's Ratio in Modern Functional Materials

Unconventional Anisotropy in Excitonic Properties and Carrier Mobility in Iodine-Based XTeI (X = Ga, In) Monolayers for Visible-Light Photocatalytic Water Splitting

The effect of large deformation on Poisson’s ratio of brain white matter: An experimental study

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