Auxetics exhibit the anomalous property of expanding laterally when uniaxially stretched, that is, a negative Poisson’s ratio. This property that arises from (1) the presence of specific geometric features within the nano/macrostructure of the material and (2) amenable deformations in response to the applied stimulus.
More about these materials and metamaterials, particularly my contribution to the field (which dates back to the 1990s when I was working under the supervision of University of Exeter academic Professor Kenneth E. Evans, the genius who coined the term “auxetic”, can be obtained from various scientific articles I co-authored (see Google Scholar page). Most of these publications were produced as part of my work with the University of Malta, my first alma mater.
One of the first images I produced, as a PhD student in the 1990s, to explain auxetic behaviour.
Joseph N Grima 
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