Combining Pattern Instability and Shape-Memory Hysteresis for Phononic Switching

Jang, Ji‐Hyun; Koh, Cheong Yang; Bertoldi, Katia; Boyce, Mary C.; Thomas, Edwin L.

doi:10.1021/nl9006112

Cited by 103 publications

(81 citation statements)

References 24 publications

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“…Thus, this behavior provides opportunities for transformative materials with properties that can be reversibly switched. Similar instability induced pattern transformations have been observed also at the sub-micron scale [22,23] . These observations pave the way for the development of a new class of materials which take advantage of such behavior.…”

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confidence: 80%

Negative Poisson's Ratio Behavior Induced by an Elastic Instability

et al. 2010

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When materials are compressed along a particular axis they are most commonly observed to expand in directions orthogonal to the applied load. The property that characterizes this behavior is the Poisson's ratio which is defined as the ratio between the negative transverse and longitudinal strains. The majority of materials are characterized by a positive Poisson's ratio which is approximately 0.5 for rubber and 0.3 for glass and steel. Materials with a negative Poisson's ratio will contract (expand) in the transverse direction when compressed (stretched) and, although they can exist in principle, demonstration of practical examples is relatively recent. Discovery and development of materials with negative Poisson's ratio, also called auxetics, was first reported in the seminal work of Lakes in 1987. [1] There is significant interest in the development of auxetic materials because of tremendous potential in applications in areas such the design of novel fasteners [2] , prostheses [3] , piezocomposites with optimal performance [4] and foams with superior damping and acoustic properties [5] . The results of many investigations [6][7] suggest that the auxetic behavior involves an interplay between the microstructure of the material and its deformation. Examples of this are provided by the discovery that metals with a cubic lattice [8] , natural layered ceramics [9] , ferroelectric polycrystalline ceramics [10] and zeolites [11] may all exhibit negative Poisson's ratio behavior. Moreover, several geometries and mechanisms have been proposed to achieve negative values for the Poisson's ratio, including foams with reentrant structures [1] , hierarchical laminates [12] , polymeric and metallic foams [13] , microporous polymers [14] , molecular networks [15] and manybody systems with isotropic pair interactions [16] . Negative Poisson's ratio effects have also been demonstrated at the micron scale using complex materials which were fabricated using soft lithography [17] and at the nanoscale with sheets assemblies of carbon nanotubes [18] .A significant challenge in the fabrication of materials with auxetic properties is that it usually involves embedding structures with intricate geometries within a host matrix. As such, the manufacturing process has

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confidence: 80%

Negative Poisson's Ratio Behavior Induced by an Elastic Instability

et al. 2010

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“…In fact, an attempt has recently been made to synthesize materials that have submicron periodic structures with the capability of mechanical transformation [11,12]. However, the exact mechanism responsible for the change in structural colours of fish has not been fully understood, even for one of the most striking examples, the neon tetra (Paracheirodon innesi).…”

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confidence: 99%

Mechanism of variable structural colour in the neon tetra: quantitative evaluation of the Venetian blind model

Yoshioka

Matsuhana

Tanaka

et al. 2010

J. R. Soc. Interface.

116

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The structural colour of the neon tetra is distinguishable from those of, e.g., butterfly wings and bird feathers, because it can change in response to the light intensity of the surrounding environment. This fact clearly indicates the variability of the colour-producing microstructures. It has been known that an iridophore of the neon tetra contains a few stacks of periodically arranged light-reflecting platelets, which can cause multilayer optical interference phenomena. As a mechanism of the colour variability, the Venetian blind model has been proposed, in which the light-reflecting platelets are assumed to be tilted during colour change, resulting in a variation in the spacing between the platelets. In order to quantitatively evaluate the validity of this model, we have performed a detailed optical study of a single stack of platelets inside an iridophore. In particular, we have prepared a new optical system that can simultaneously measure both the spectrum and direction of the reflected light, which are expected to be closely related to each other in the Venetian blind model. The experimental results and detailed analysis are found to quantitatively verify the model.

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“…2A). This behavior has been demonstrated to provide opportunities for the design of materials with tunable negative Poisson's ratio [17], phonic switches [18] and strain-tunable optomechanical materials [19]. However, so far only the response of structures with circular and elliptical holes has been investigated and the effect of the pores shape on the structural response has not been explored yet.…”

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confidence: 99%