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CMP
Credit: Jack Hobhouse

David Keen

Visiting Professor

Sub department

  • Condensed Matter Physics

Research groups

  • X-ray and neutron scattering
david.keen@physics.ox.ac.uk
Telephone: 01865 (2)72310
Clarendon Laboratory, room 106
  • About
  • Publications

Reversible pressure-induced amorphization of a zeolitic imidazolate framework (ZIF-4)

Chem Commun (Camb) 47 (2011) 7983-7985

Authors:

TD Bennett, P Simoncic, SA Moggach, F Gozzo, P Macchi, DA Keen, JC Tan, AK Cheetham

Abstract:

We report the reversible pressure-induced amorphization of a zeolitic imidazolate framework (ZIF-4, [Zn(Im)(2)]). This occurs irrespective of pore occupancy and takes place via a novel high pressure phase (ZIF-4-I) when solvent molecules are present in the pores. A significant reduction in bulk modulus upon framework evacuation is also observed for both ZIF-4 and ZIF-4-I.
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The first 21 years of reverse Monte Carlo modelling—a workshop held in Budapest, Hungary (1–3 October 2009)

Journal of Physics Condensed Matter IOP Publishing 22:40 (2010) 400301

Authors:

David A Keen, László Pusztai
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The hydrogen-bonding transition and isotope-dependent negative thermal expansion in H3Co(CN)6.

J Phys Condens Matter 22:40 (2010) 404202

Authors:

David A Keen, Martin T Dove, John SO Evans, Andrew L Goodwin, Lars Peters, Matthew G Tucker

Abstract:

We investigate the structures of H(3)Co(CN)(6) and D(3)Co(CN)(6) and their temperature dependence using a combination of advanced neutron and x-ray diffraction techniques. Lattice parameter refinements show marked temperature- and isotope-dependent effects in the thermal expansion behaviour. Reverse Monte Carlo modelling of neutron total scattering data characterizes the distribution of D atom positions in the deuterated compound; analysis of these distributions reveals that the two N-H/D bonds become increasingly different with increasing temperature, suggesting a mechanism for the observed thermal expansion anomalies. We discuss these results in the context of the previous crystallographic, spectroscopic and theoretical results for H(3)Co(CN)(6) and 'super-short' N···H···N systems in general.
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Risks and causes of musculoskeletal injuries among health care workers

Occupational Medicine Oxford University Press (OUP) 60:5 (2010) 389-394

Authors:

K Ngan, S Drebit, S Siow, S Yu, D Keen, H Alamgir
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Metal Ion Roles and the Movement of Hydrogen during Reaction Catalyzed by D-Xylose Isomerase: A Joint X-Ray and Neutron Diffraction Study

Structure Elsevier 18:6 (2010) 688-699

Authors:

Andrey Y Kovalevsky, Leif Hanson, S Zoe Fisher, Marat Mustyakimov, Sax A Mason, V Trevor Forsyth, Matthew P Blakeley, David A Keen, Trixie Wagner, HL Carrell, Amy K Katz, Jenny P Glusker, Paul Langan
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