Negative Poisson's Ratio in Modern Functional Materials

Abstract

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.

On the Structural and Mechanical Properties of Poly(Phenylacetylene) Truss‐Like Hexagonal Hierarchical Nanonetworks

“…This means that the systems might lend themselves to some potential niche applications which require sudden changes in transverse dimensions upon reaching some critical load, such as smart sensors. Auxeticity which occurs after reaching some extent of applied strain has also been demonstrated before in other materials and structures at nanoscale as well as macroscale which also exhibit negative Poisson's ratio at finite strain …”

“…Auxeticity which occurs after reaching some extent of applied strain has also been demonstrated before in other materials and structures at nanoscale as well as macroscale which also exhibit negative Poisson's ratio at finite strain. [79][80][81][82][83][84][85] All this is very significant since it has been shown that these hierarchical nanoscale honeycombs, where the lower level is provided through a truss system exhibits some very useful properties, which when combined with other properties characteristic of polyphenylactylenes (e.g., the high conductivity due to the extensive electronic delocalisation of these systems) make them ideal for potential use in a number of applications which would require such systems. These could range from nanofilters (these systems benefit from the presence of zeolitelike pores which have dimensions in the nm scale) to components in electronic devices.…”

A perspective on auxetic nanomaterials

“…Auxetic materials also may have enhanced shear resistance, indentation resistance, fracture toughness, and enhanced damping of wave propagation and vibration transmission in periodic auxetic structures [16, 17]. …”

Auxetic deformations and elliptic curves

“…In elasticity theory, Poisson's ratio for two orthogonal directions a and b is defined as the signed ratio of the lateral effect along b to the extension along a due to uniaxial tension applied in that direction. For “typical” materials the Poisson's ratio is taken with a positive sign, while materials with auxetic behavior are said to have negative Poisson's ratios [18, 19, 22, 23, 24]. The difference is often illustrated in the literature with the two-dimensional periodic bar-and-joint honeycomb examples shown in Fig.…”