Papers in Refereed Journals:

[1] J.N. Grima et al.,  “Natrolite: A Zeolite with negative Poisson's Ratio”,  J. Appl. Phys. (In Press).

[2] J.N. Grima, P.S. Farrugia, R. Gatt and V. Zammit,  “A system with adjustable positive or negative thermal expansion”, Proc. Roy. Soc. A (2007) [DOI: 10.1098/rspa.2007.1841]. See also review in New Scientist. 

[3] J.N. Grima, P.S. Farrugia, R. Gatt and V. Zammit,  “Connected triangles exhibiting negative Poisson’s ratios and negative thermal expansion”, J. Phys. Soc. Jpn., 76 (2007) 025001. 

[4] J.N. Grima, V. Zammit, R. Gatt, A. Alderson and K.E. Evans, Auxetic behaviour from rotating semi-rigid units”, Phys. Stat. Sol. (b),  244 (2007) p. 866-882.

[5] J.N. Grima, V. Zammit and R. Gatt, Negative Thermal Expansion, Article accepted for publication in Xjenza - Journal of the Malta Chamber of Scientists.

[6] J.N. Grima, R. Gatt, N. Ravirala, A. Alderson and K.E. Evans, “Negative Poisson’s ratios in cellular foam materials”, Mater. Sci & Eng. A, 423 (2006) p. 214-218.

[7] J.N. Grima, R. Gatt, A. Alderson and K.E. Evans, “An alternative explanation for the negative Poisson’s ratios in alpha-cristobalite”, Mater. Sci & Eng. A, 423 (2006) p. 219-224.

[8] J.N. Grima and K.E. Evans, “Auxetic behaviour from Rotating Triangles”, J. Mater. Sci., 41 (2006) p. 3193 - 3196.

[9] J.N. Grima, R. Gatt, V. Zammit, A. Alderson and K..E. Evans, “On the suitability of empirical models to simulate the mechanical properties of alpha-cristobalite”, Xjenza - Journal of the Malta Chamber of Scientists, 10 (2005) p. 24-31.

[10] J.N. Grima, R. Gatt, T.G. Chircop Bray, A. Alderson and K.E. Evans, “Empirical Modelling Using Dummy Atoms (EMUDA): An alternative approach for studying ‘auxetic’ structures”, Molecular Simulation, 31 (2005), p. 915-924.

[11] J.N. Grima, R. Gatt, A. Alderson and K.E. Evans, “On the potential of connected stars as auxetic systems”, Molecular Simulation, 31 (2005), p. 925-935.

[12] J.N. Grima, J.J. Williams, R. Gatt and K.E. Evans, “Modelling of auxetic networked polymers built from calix[4]arene building blocks”, Molecular Simulation, 31 (2005), p. 907-913.

[13] A. Alderson, P.J. Davies, K. E. Evans, K.L. Alderson and J.N. Grima, “Modelling of the mechanical and mass transport properties of auxetic molecular sieves: an idealised inorganic (zeolitic) host-guest system”, Molecular Simulation, 31 (2005), p.889-896.

[14] A. Alderson, P.J. Davies, M.R. Williams, K.E. Evans, K.L. Alderson and J.N. Grima, “Modelling of the mechanical and mass transport properties of auxetic molecular sieves: an idealised organic (polymeric honeycomb) host-guest system”,  Molecular Simulation, 31 (2005), p. 897-905.

[15] J.N. Grima, J.J. Williams and K.E. Evans, “Networked calix[4]arene polymers with unusual mechanical properties”, Chem. Comm., (2005) p. 4065-4067.

[16]   J.N. Grima, R. Gatt, A. Alderson and K.E. Evans, “On the origin of auxetic behaviour in the silicate alpha-cristobalite”, J. Mater. Chem., 15 (2005) p. 4003 – 4005. 

[17] J.N. Grima, R. Gatt, A. Alderson and K.E. Evans, “On the auxetic properties of ‘rotating rectangles’ with different connectivity”, J. Phys. Soc. Jpn., 74 (2005) p. 2866-2867.

[18] N. Gaspar, X.J. Ren, J.N. Grima, C.W. Smith  and K.E. Evans, “Novel  Honeycombs  with  Auxetic  Behaviour”, Acta Materiala, 53 (2005) p. 2439-2445. 

[19] J.N. Grima, A. Alderson and K.E. Evans, An alternative explanation for the negative Poisson's ratios in auxetic foams, J. Phys. Soc. Jpn., 74 (2005) p. 1341-1342. 

[20] J.N. Grima, A. Alderson and K.E. Evans, Auxetic behaviour from rotating rigid units, Phys. Stat. Sol. (b) 242 (2005) p. 561-575. 

[21] A. Alderson, K.L. Alderson, K.E. Evans, J.N. Grima, M. Williams and P.J. Davies, “Modelling the deformation mechanisms, structure-property relationships and applications of auxetic nanomaterials”, Phys. Stat. Sol. (b) 242 (2005) p. 499–508. 

[22] A. Alderson, K.L. Alderson, K.E. Evans, J.N. Grima and M. Williams, Modelling of negative Poisson’s ratio nanomaterials: deformation mechanisms, structure-property relationships and applications, Journal of Metastable & Nanocrystalline Materials, 23 (2005) p. 55-58.

[23] J.N. Grima, A. Alderson and K.E. Evans, Negative Poisson’s ratios from rotating rectangles, Computational Methods in Science & Technology, 10 (2004) p. 137-145. 

[24] A. Alderson, K.L. Alderson, K.E. Evans, J.N. Grima, M.R. Williams, and P.J. Davies, Molecular modelling of the deformation mechanism acting in auxetic silica, Computational Methods in Science & Technology, 10 (2004) p. 117-126.

[25] A. Alderson, J. Rasburn, K.E. Evans and J.N. Grima, Auxetic polymeric filters display enhanced de-fouling and pressure compensation properties, Membrane Technology, 137 (2001) p. 6-8. 

[26] J.N. Grima, R. Jackson, A. Anderson and K.E. Evans, Do zeolites have negative Poisson's ratios?, Adv. Mater., 12 (2000) p. 1912-1918.

[27] C.W. Smith, J.N. Grima and K.E. Evans, A novel mechanism for generating auxetic behaviour in reticulated foams: Missing rib foam model, Acta Materiala, 48 (2000) p. 4349-4356.

[28]   J.N. Grima and K.E. Evans, Rotating squares with negative Poisson's ratios, J. Mat. Sci. Lett., 19 (2000) p.1563-1565.

[29]   J.N. Grima and K.E. Evans, Self expanding networks, Chem. Comm., (2000) p.1531-1532.
 

 
[30] J.N. Grima, R. Gatt, P.S. Farrugia, A. Alderson and K.E. Evans, in “Auxetic cellular materials and structures”, ASME International Mechanical Engineering Congress Proceedings (2005) (In Press).

[31] J.N. Grima and K.E. Evans, Networked polymers with negative Poisson's ratios, ACS Polymeric Materials Science & Engineering Preprints, 83 (2000) p. 367-368. 

[32] C.W. Smith, J.N. Grima, B.D. Caddock, R.J. Wootton and K.E. Evans, Microstructures producing negative Poisson's ratios: Experiment and models, SEM Theoretical, Experimental and Computational Mechanics Preprints (1999) p.184-187. 
 
 

 
[33] J.N. Grima, V. Zammit, R. Gatt, M. Wood et al., Zeolites with negative Poisson’s ratios: The effect of interstitial cations and water molecules on the Poisson’s ratios of NAT, Paper accepted for presentation at the 5th International Conference on Inorganic Materials 2006, Ljubljana (Slovenia), September 2006.

[34] J.N. Grima, R. Gatt and V. Zammit, On the suitability of commonly used force-fields for simulating the Poisson's ratios and moduli of single crystalline materials, Paper presented at the 232nd National ACS meeting, San Francisco CA (USA), September 2006.

[35] J.N. Grima, R. Gatt and T.G. Chircop Bray, Modeling of mechanical structures using "dummy atoms" and "molecular modeling techniques", Paper presented at the 232nd National ACS meeting, San Francisco CA (USA), September 2006.

[36] J.N. Grima, R. Gatt, T.G. Chircop Bray, V. Zammit, A. Alderson and K.E. Evans, Auxeticity and microscopic rotations of rigid and semi-rigid units in silicates and zeolites, Paper presented at the 1st International Conference on Auxetics and Anomalous Systems (Incorporating the 3rd Int. Workshop on Auxetics and Related Systems), Exeter UK, September 2006.

[37] J.N. Grima, R. Gatt, P.S. Farrugia, N. Raviala, W. Miller, V. Zammit, T.G. Chircop Bray, F. Scarpa, A. Alderson, C.W. Smith, K.E. Evans and K. Alderson, On the auxetic potential of 2D networks constructed from chiral building-blocks, Paper presented at the 1st International Conference on Auxetics and Anomalous Systems (Incorporating the 3rd Int. Workshop on Auxetics and Related Systems), Exeter UK, September 2006.

[38] J.N. Grima, V. Zammit, P.S. Farrugia, R. Gatt, On the negative thermal properties of connected rods, Paper presented at the 1st International Conference on Auxetics and Anomalous Systems (Incorporating the 3rd Int. Workshop on Auxetics and Related Systems), Exeter UK, September 2006.

[39] R. Gatt, P.S. Farrugia and J.N. Grima, Auxetic ‘meta-chiral’ networks, Paper presented at the 1st International Conference on Auxetics and Anomalous Systems (Incorporating the 3rd Int. Workshop on Auxetics and Related Systems), Exeter UK, September 2006.

[40] J.N. Grima, R. Gatt, P.S. Farrugia and K.E. Evans, On the auxetic potential of ‘tetra-chiral’ and ‘anti-tetrachiral’ networks, Paper presented at the 1st International Conference on Auxetics and Anomalous Systems (Incorporating the 3rd Int. Workshop on Auxetics and Related Systems), Exeter UK, September 2006.

[41] J.N. Grima, R. Gatt, P.S. Farrugia, N. Raviala, A. Alderson, K. Alderson and K.E. Evans, On the relationship between auxetic ‘rotating polygons’ and ‘chiral’ systems, Paper presented at the 1st International Conference on Auxetics and Anomalous Systems (Incorporating the 3rd Int. Workshop on Auxetics and Related Systems), Exeter UK, September 2006.

[42] F. Nezare, A. Alderson, P. Bullman, P. Davies and J.N. Grima, Modelling of phase transformation behaviour in anomalous systems, Paper presented at the 1st International Conference on Auxetics and Anomalous Systems (Incorporating the 3rd Int. Workshop on Auxetics and Related Systems), Exeter UK, September 2006.

[43] N. Rarirala, K.L. Alderson, J.N. Grima and A. Alderson, Linear Elastic in-plane mechanical properties of trichiral and anti-trichiral honeycombs, Paper presented at the 1st International Conference on Auxetics and Anomalous Systems (Incorporating the 3rd Int. Workshop on Auxetics and Related Systems), Exeter UK, September 2006.

[44] R. Gatt, J.N. Grima, F. Nazarre, A. Alderson and K.E. Evans, On the properties of alpha-cristobalite, Paper presented at the 3rd National Chemistry Symposium, Msida Malta, March 2006. 

[45] J.N. Grima, V. Zammit and R. Gatt, Modelling of inorganic single crystalline auxetic materials, Paper presented at the 3rd National Chemistry Symposium, Msida Malta, March 2006. 

[46] J.N. Grima, B. Spiteri, L. Trapani, K.E. Evans, Organic networked systems with negative Poisson’s ratios, Paper presented at the 3rd National Chemistry Symposium, Msida Malta, March 2006. 

[47] J.N. Grima, V. Zammit and L. Trapani, Negative thermal expansion – materials which get smaller when heated, Paper presented at the 3rd National Chemistry Symposium, Msida Malta, March 2006.

[48] J.N. Grima, R. Gatt, V. Zammit, T.G. Chircop Bray et al., On negative thermal expansion and negative poisson’s ratios: converting ‘positive materials’ to ‘negative materials’, Paper presented at the 3rd National Chemistry Symposium, Msida Malta, March 2006.

[49] J.N. Grima, T.G. Chircop Bray and R. Gatt, Modelling of self-expanding structures using molecular modelling techniques (EMUDA) , Paper presented at the 3rd National Chemistry Symposium, Msida Malta, March 2006.

[50] J.N. Grima, R. Gatt, A.C. Bonnici and T.G. Chircop Bray, On dilating connected squares, Paper presented at the 3rd National Chemistry Symposium, Msida Malta, March 2006.

[51] J.N. Grima, T.G. Chircop Bray and R. Gatt, Rotating ‘dilating non-rigid squares’, Paper presented at the 3rd National Chemistry Symposium, Msida Malta, March 2006.

[52] J.N. Grima, B. Spiteri and R. Gatt, On the mechanical properties of chlorosodalite, Paper presented at the 3rd National Chemistry Symposium, Msida Malta, March 2006.

[53] J.N. Grima, R. Gatt, A. Alderson and K.E. Evans, “On rotating ‘rigid’ and ‘semi-rigid’ units and their potential for auxetic behaviour”, Paper Presented at the 2nd Workshop on Auxetic and Related Systems, Poznan (Poland), August 2005.

[54] F. Nezare, A. Alderson, P. Davies, P. Bullman and J.N. Grima, “Modelling the alpha-to-beta phase change in cristobalite”, Paper Presented at the 2nd Workshop on Auxetic and Related Systems, Poznan (Poland), August 2005.

[55] J.N. Grima, R. Gatt, A. Alderson, and K.E. Evans, The deformation mechanisms in the auxetic mineral alpha-cristobalite, Paper presented at the RSC MC7, Edinburgh, UK, 2005

[56] J.N. Grima, R. Gatt, A. Alderson, and K.E. Evans, On the origin of the negative Poisson’s ratios in alpha-cristobalite, Paper presented at the ICMAT, Singapore, 2005

[57] J.N. Grima, R. Gatt, N. Ravalla, A. Alderson, and K.E. Evans, Negative Poisson’s ratios in cellular materials, Paper presented at the ICMAT, Singapore,  2005

[58] J.N. Grima, Auxetic Materials: Recent Advances, Invited Keynote Contribution at AUXETNET’s Second Annual Young Researchers Forum, Cambridge (UK), March 2005.

[59] J.N. Grima, R. Gatt, A. Vella, A. Alderson, and K.E. Evans, Modelling of alpha-cristobalite using Molecular Dynamics Simulations, Paper presented at AUXETNET’s Second Annual Young Researchers Forum, Cambridge (UK), March 2005 (winner of the best poster award).

[60] J.N. Grima, T.G. Chircop-Bray, S.L. Borg-Bonnici, R. Gatt, and K.E. Evans, Modelling of Auxetic Macrostructres using ‘EMUDA Modelling’ Techniques, Paper presented at AUXETNET’s Second Annual Young Researchers Forum, Cambridge (UK), March 2005

[61] J.N. Grima, R. Gatt and K.E. Evans, “Modelling of the negative Poisson’s ratios in alpha-cristobalite”, Paper presented at the Fourth International Inorganic Materials Conference, Antwerp (Belgium), September 2004.

[62] J.N. Grima, R. Gatt, A. Alderson and K.E. Evans, “Modelling of the auxetic behaviour in alpha-cristobalite”, Paper presented at the 228th National ACS meeting, Philadelphia (USA), August 2004.

[63] J.N. Grima, “Molecular Level Auxetic Materials”, Invited Key-Note Paper presented at AUXETNET’s First Annual Young Researchers Forum, Bolton (UK), April 2004. 

[64] R. Gatt and J.N. Grima, “Negative Poisson’s Ratios in alpha-Cristobalite”, Paper presented at AUXETNET’s First Annual Young Researchers Forum, Bolton (UK), April 2004.

[65] B. Spiteri, J.J. Williams, K.E. Evans and J.N. Grima, “Auxeticity in Calix(4)Arene Systems”, Paper presented at AUXETNET’s First Annual Young Researchers Forum, Bolton (UK), April 2004.

[66] M. Wood, A. Alderson, K.E. Evans and J.N. Grima, Molecular modelling of auxetic zeolites,  Paper presented at the 2nd National Chemistry Symposium, March 2004, Malta. 

[67] J.J. Williams, K.E. Evans and J.N. Grima, Molecular modelling of calix(4)arene systems with unusual mechanical properties, Paper presented at the 2nd National Chemistry Symposium, March 2004, Malta. 

[68] B. Spiteri, R. Gatt  and J.N. Grima, “Materials with Negative Poisson's Ratios”, Paper presented at the Second National Chemistry Symposium, Msida (Malta), March 2004.

[69] R. Gatt, B. Spiteri and J.N. Grima, “Molecular Auxetic Materials”, Paper presented at the Second National Chemistry Symposium, Msida (Malta), March 2004.

[70] J.N. Grima, “Molecular Level Auxetic Materials”, Invited Key-Note Paper presented at AUXETNET’s First Annual Young Researchers Forum, Bolton (UK), April 2004. 

[71] J.N. Grima and A.J. Vella, “Adequacy of pre-university mathematics curriculum as a preparation for chemistry undergraduate studies”, Paper presented at the 226th ACS National Meeting, New York (USA.), September 2003.

[72] J.N. Grima, M. Wood, A. Alderson and K.E. Evans, Zeolites with unusual mechanical properties, Paper presented at the 226th ACS National Meeting, New York (USA.), September 2003.

[73] J.N Grima and K.E. Evans, Networked polymeric calix[4]arenas with unusual mechanical materials, Paper presented at the 5th Materials Chemistry conference, Bangor (Wales), July 2001 (P22).

[74] J.N. Grima, A. Alderson and K.E. Evans, Modelling zeolites with negative Poisson's ratios, Paper presented at 2nd Inorganic Materials Conference, Sta. Barbara, USA, September 2000.

[75] J.N. Grima and K.E. Evans, Networked polymers with negative Poisson's ratios, Paper presented at 220th ACS National Meeting (PMSE Division), Washington DC, August 2000.

[76] J.N. Grima, A. Alderson and K.E. Evans, Zeolites with negative Poisson's ratios, Paper presented at 220th ACS National Meeting (Inorganic Division), Washington DC, August 2000.

[77] J.N. Grima, A. Alderson and K.E. Evans, Zeolites with negative Poisson's ratios, Paper presented at the 4th Materials Chemistry conference, Dublin (Ireland), July 1999 (P81).

[78] J.N. Grima and K.E. Evans, Molecular auxetic materials, Paper presented at the 4th Materials Chemistry conference, Dublin (Ireland), July 1999 (B2.1).

[79] J.N. Grima and K.E. Evans, The modelling and synthesis of auxetic materials, Paper presented at the 3rd Materials Chemistry conference, Exeter (UK), July 1997 (P125).
 
 

[80] J.N. Grima, Auxetics - The more you stretch them, the fatter they become, University of Malta Annual Report, 2002, p. 35-37.

[81] J.N. Grima, Auxetics materials - The more you stretch them, the fatter they become, Seminar presented at the Melville Laboratory, Department of Chemistry, University of Cambridge, UK, June 2006.

[82] J.N. Grima, Auxetics materials, Seminar presented at the Department of Engineering, University of Exeter, UK, 1999.