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Yusuf Hamied Department of Chemistry

 

Our main interest is in the relationship between the structure and properties of solids. We study the geometric reasons for the chemical activity of solids and the relationship between local order and physical properties, using mathematical techniques and computer graphics. We use solid-state nuclear magnetic resonance spectroscopy (NMR) to examine molecular sieves, minerals, layered materials, fullerenes, ceramics and biological materials.

The G minimal surface divides space into two interpenetrating labyrinths (coloured red and green).

Specific projects:

  • Periodic minimal surfaces (surfaces with zero mean curvature), which appear in a variety of inorganic, organic and biological structures, and the associated mathematical problems.
  • Morphogenesis (the origin of shape and form).
  • Systematic enumeration of crystalline networks using mathematical tiling theory.
  • Graphite, graphite oxide and graphene.
  • Synthesis and characterization of microporous and mesoporous molecular sieves.
  • Synthesis and characterization of metal-organic frameworks (MOFs).

Selected Publications

Hypothetical zeolitic frameworks: In search of potential heterogeneous catalysts. J. Phys. Chem. 112, 1040 (2008)

Low-temperature thermal decomposition of large single crystals of ammonium perchlorate. Chem. Phys. Lett. 454, 233 (2008)

Simulating self-assembly of ZnS nanoparticles into mesoporous materials. J. Am. Chem. Soc. 128, 15283 (2006)

Cross-polarization in the solid state. A guide for chemists. Chem. Rev. 102, 613 (2002)

Synthesis and characterization of a new layered compound of trimesic acid. New Journal of Chemistry 26, 381 (2002)

Exact computation of the triply periodic G ('gyroid") minimal surface. Chem. Phys. Lett. 321, 363 (2000)

Systematic enumeration of crystalline networks. Nature 400, 644 (1999)

Structural studies of tabasheer, an opal of plant origin. Phil. Mag. A 77, 201 (1998)

Structure of graphite oxide revisited. J. Phys. Chem. B102, 4477 (1998)

Solid-state NMR studies of fullerene C60/benzene solvates. J. Phys. Chem. B101, 117 (1997)

New rapidly convergent series representations for z (2 n + 1). Proc. Am. Math. Soc. 125, 1263 (1997)

Directing the pore dimensions in the mesoporous molecular sieve MCM-41. Chem. Phys. Lett. 263, 247 (1996)

Taboo Search: an approach to the multiple-minima problem. Science, 267, 664 (1995)

Publications

The evaluation of non-equivalent tetrahedral sites from 29Si NMR chemical shifts in zeolites and related aluminosilicates
JM THOMAS, J KLINOWSKI, S RAMDAS, BK HUNTER, DTB TENNAKOON
– Chemical Physics Letters
(1983)
102,
158
New approaches to the structural characterization of zeolites. Part I. Magic-angle-spinning NMR (MAS-NMR)
JM THOMAS, J KLINOWSKY, S RAMADAS, MW ANDERSON, CA FYFE, GC GOBBI
– ACS Symposium Series
(1983)
218,
159
CHARACTERIZATION OF LOCAL ATOMIC ENVIRONMENTS AND QUANTITATIVE-DETERMINATION OF CHANGES IN SITE OCCUPANCIES DURING THE FORMATION OF ORDERED SYNTHETIC CORDIERITE BY SI-29 AND AL-27 MAGIC-ANGLE SPINNING NMR-SPECTROSCOPY
CA FYFE, GC GOBBI, J KLINOWSKI, A PUTNIS, JM THOMAS
– Chemical Communications
(1983)
556
A study of Si, AI ordering and cation positions in the zeolites sodium ZK-4 and sodium Y by neutron diffraction
AK CHEETHAM, MM EDDY, J KLINOWSKI, JM THOMAS
– Chemical Communications
(1983)
23
On the siting of aluminium in zeolite omega
J KLINOWSKI, MW ANDERSON, JM THOMAS
– Chemical Communications
(1983)
525
Dealumination of mordenite using silicon tetrachloride vapour
J KLINOWSKI, JM THOMAS, MW ANDERSON, CA FYFE, GC GOBBI
– Zeolites
(1983)
3,
5
A re-examination of Si, Al ordering in zeolites NaX and NaY
J KLINOWSKI, S RAMDAS, JM THOMAS, CA FYFE, JS HARTMAN
– Journal of the Chemical Society, Faraday Transactions 2
(1982)
78,
1025
Resolving crystallographically distinct tetrahedral sites in silicalite and ZSM-5 by solid-state NMR
CA FYFE, GC GOBBI, J KLINOWSKI, JM THOMAS, S RAMDAS
– Nature
(1982)
296,
530
Monitoring of structural changes accompanying ultrastabilization of faujasitic zeolite catalysts
J KLINOWSKI, JM THOMAS, CA FYFE, GC GOBBI
– Nature
(1982)
296,
533
PROBLEMS ASSOCIATED WITH THE MICROPOLAROGRAPHIC MEASUREMENT OF THE ARTERIAL-WALL PO2
J Klinowski, SE Korsner, CP Winlove
– Cardiovascular Research
(1982)
16,
448
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Research Group

Email address

jk18@cam.ac.uk

College

Peterhouse