I am currently working as part of Exeter's "Auxetic
Materials Research Group". This research group's primary concern is with materials with negative Poisson's ratios, which are commonly called 'auxetic'. These materials get fatter when stretched, and thinner when compressed. This unusual property has far-reaching consequences for numerous applications in science and engineering.
I have recently submitted a doctoral thesis entitled 'New Auxetic Materials' in which I have been looking at new structures and mechanism that produce negative Poisson's ratios. I have then investigated ways of downscaling these mechanisms to the molecular level in an attempt to design tailor-made molecular auxetics.
Recent publications include:
J.N Grima and K.E. Evans, The modelling and synthesis of auxetic materials,
Proceedings of the 3rd Materials Chemistry
conference, Exeter (UK), July 1997, P125.
- C.W. Smith, J.N. Grima, B.D. Caddock, R.J. Wootton and K.E. Evans,
Microstructures producing negative Poissonís ratios: Experiment and models, Proceedings of the Spring Conference of the Society for Experimental Mechanics, Cincinnati (USA), June 1999, p.184-187
J.N Grima and K.E. Evans, Molecular auxetic materials, Proceedings of the 4th Materials Chemistry conference, Dublin (Ireland), July 1999, B2.1.
J.N Grima, A. Alderson and K.E. Evans, Zeolites with negative Poissonís
ratios, Proceedings of the 4th Materials Chemistry conference, Dublin
(Ireland), July 1999. P81.
J.N. Grima and K.E. Evans, Networked nanostructured polymers with negative
Poissonís ratios, Abstract accepted for publication at the Materials
Research Society Spring Conference, San Francisco, California (USA),
J.N. Grima and K.E. Evans, Rotating squares with negative Poissonís
ratios, Accepted for publication in J. Mat. Sci. Lett., February