B.S., Cairo University
M.S., Cairo University
Ph.D., Georgetown University
Our research interests are in the general areas of molecular clusters, gas phase and cluster polymerization, nucleation phenomena and nanostructured materials. The major goal is to gain insights as to how the properties of matter evolve as the size of a material system ranges from molecular to macroscopic dimensions. Research is under way in three areas, each involving a variety of experimental techniques (molecular beams, lasers, mass spectrometry and light scattering) with close collaboration with modern theoretical approaches.
Molecular clusters, gas phase and cluster polymerization
Molecular beam techniques are applied to synthesize different classes of weakly bound molecular clusters and metal atom-doped molecular clusters. Resonant two-photon ionization coupled with time-of-flight mass spectrometry is then applied to study the spectroscopy of size specific clusters. We are interested in measuring the size-dependent spectroscopic lineshifts and lineshapes of a particular atomic or molecular excitation in these clusters.
Vapor phase homogeneous and ion-induced nucleation
Nucleation is one of the most ubiquitous and important phenomena in science and technology. It plays a central role in materials science, crystal growth, chemical processing, atmospheric science and cosmochemistry. This research area is of increasing importance to atmospheric chemistry, polar stratospheric clouds, acid rain and air pollution.
Nanoscale particles possess several unique properties such as large surface areas, unusual adsorptive properties, surface defects and fast diffusivities. The intrinsic properties of the interior of the nanocrystals are transformed by quantum size effects. The ability to manipulate the energetics of nanocrystal surfaces at will would have many practical consequences particularly in the fields of catalysis and novel materials.
Updated October 2010
Abdelsayed, V.; Moussa, S.; Hassan, H. M.; Aluri, H. S.; Collinson, M. M.; El-Shall, M. S., Photothermal deoxygenation of graphite oxide with laser excitation in solution and graphene-aided increase in water temperature. Journal of Physical Chemistry Letters 2010, 1, 2804-2809.
Mohamed, M. B.; AbouZeid, K. M.; Abdelsayed, V.; Aljarash, A. A.; El-Shall, M. S., Growth mechanism of anisotropic gold nanocrystals via microwave synthesis: Formation of dioleamide by gold nanocatalysis. ACS Nano, 2010, 4, 2766-2772.
El-Shall, M. S.; Ibrahim, Y. M.; Alsharaeh, E. H.; Meot-Ner, M.; Watson, S. P., Reactions between aromatic hydrocarbons and heterocycles: Covalent and proton-bound dimer cations of benzene/pyridine. Journal of the American Chemical Society 2009, 131, 10066-10076.
El-Shall, M. S.; Abdelsayed, V.; Khder, A. S.; Hassan, M. H.; El-Kaderi, H. M.; Reich, T., Metallic and Bimetallic Nanocatalysts Incorporated into Highly Porous Coordination Polymer MIL-101. Journal of Materials Chemistry 2009, 19, 7625-7631.
Abdelsayed, V.; Aljarash, A.; El-Shall, M. S.; Al Othman, Z. A.; Alghamdi, A. A., Microwave Synthesis of Bimetallic Nanoalloys and CO Oxidation on Ceria-Supported Nanoalloys. Chemistry of Materials 2009, 21, 2825-2834.
Hassan M. A. H.; Abdelsayed, V.; Khder, A. S.; AbouZeid, K. M.; Terner, J.; El-Shall, M. S.; Al-Resayes, S. I.; El-Azhary, A., Microwave Synthesis of Graphene Sheets Supporting Metal Nanocrystals in Aqueous and Organic Media. Journal of Materials Chemistry 2009, 19, 3832-3837.
Momoh, P.O.; Soliman, A.R.; Meot-Ner, M.; Ricca, A.; El-Shall, M. S., Formation of complex organics from acetylene catalyzed by ionized benzene. Journal of the American Chemical Society 2008, 130, 12848-12849.
El-Shall, M. S., Polymerization in the gas phase, in clusters, and on nanoparticle surfaces. Accounts of Chemical Research 2008, 41, 783-792.
Momoh, P. O.; El-Shall, M. S., Gas phase hydration of organic ions. Physical Chemistry Chemical Physics 2008,10, 4827-4834.
Glaspell, G.; Anderson, J.; Wilkins, J.; El-Shall, M. S., Vapor Phase Synthesis of Upconverting Y2O3 Nanocrystals Doped with Yb3+, Er3+, Ho3+ and Tm3+ to Generate Red, Green, Blue and White Light. Journal of Physical Chemistry C 2008, 112, 11527-11531.
Momoh, P. O.; Xie, E.; Abrash, S. A.; Meot-Ner, M.; El-Shall, M. S., Gas phase reactions between acetylene radical cation and water energies, structures and formation mechanism of C2H3O+ and C2H4O+center dot ions. Journal of Physical Chemistry A 2008, 112 , 6066-6073.
Ibrahim, Y.; Alsharaeh, E.; Mabrouki, R.; Momoh, P. O.; Xie, E.; El-Shall, M. S., Ion mobility of ground and excited states of laser-generated transition metal cations. Journal of Physical Chemistry A 2008, 112, 1112-1124.
Glaspell, G.; Hassan, H. M. A.; Elzatahry, A.; Abdalsayed, V.; El-Shall, M. S., Nanocatalysis on supported oxides for CO oxidation. Topics in Catalysis 2008, 47, 22-31.
El-Shobaky, G. A.; Radwan, N. R. E.; El-Shall, M. S.; Turky, A. M.; H. M. A. Hassan, H. M. A. Synthesis and characterization of pure and ZrO2-doped nanocrystalline CuO-NiO system. Applied Surface Science 2008, 254, 1651-1660.
Devlin, M. T.; Aradi, A. A.; Guevremont, J. M.; Jao, T. C.; Abdelsayed, V.; El-Shall, M. S., Friction and film-formation properties of oil-soluble inorganic nanoparticles. SAE International Journal of Fuels and Lubricants 2008, 01, 1503-1510.
Moussa, S. O.; El-Shall, M. S., Fabrication of nanostructured nickel and titanium aluminides starting from elemental nanopowders. Materials Chemistry and Physics 2008, 112, 1015-1020.
Abdelsayed, V.; Glaspell, G.; Nguyen, M.; Howe, J. M.; El-Shall, M. S., Laser synthesis of bimetallic nanoalloys in the vapor and liquid phases and the magnetic properties of PdM and PtM nanoparticles (M = Fe, Co and Ni). Faraday Discussions 2008, 138, 163-180.
Fouad, O. A.; Glaspell, G.; El-Shall, M. S., Growth and characterization of ZnO, SnO2 and ZnO/SnO2 nanostructures from the vapor phase. Topics in Catalysis 2008, 47, 84-96.
Panda, A. B.; Glaspell, G.; El-Shall, M. S., Microwave synthesis and optical properties of uniform nanorods and nanoplates of rare earth oxides. Journal of Physical Chemistry C 2007, 111, 1861-1864.
Momoh, P. O.; El-Shall, M. S., Stepwise hydration of ionized acetylene trimer. Further evidence for the formation of benzene radical cation. Chemical Physics Letters 2007, 436, 25-29.
Ibrahim, Y.; Mabrouki, R.; Meot-Ner, M.; El-Shall, M. S., Hydrogen bonding interactions of Pyridine(center dot+) with water: Stepwise solvation of distonic cations. Journal of Physical Chemistry A 2007, 111, 1006-1014.
Abdelsayed, V.; El-Shall, M. S., Vapor phase nucleation on neutral and charged nanoparticles: Condensation of supersaturated trifluoroethanol on Mg nanoparticles. Journal of Chemical Physics 2007, 126, 024706 (1-6).
Moussa, S. O.; El-Shall, M. S., High-temperature characterization of reactively processed nanostructure nickel aluminide intermetallics. Journal of Alloys And Compounds 2007, 440, 178-188.
Radwan, N. R. E.; El-Shobaky, G. A.; Hassan, H. M. A.; El-Shall, M. S., Synthesis and characterization of nanoparticle Co3O4, CuO and NiO catalysts prepared by physical and chemical methods to minimize air pollution. Applied Catalysis A, 2007, 331, 8-18.
Moussa, S. O.; El-Gizawy, A. S.; El-Shall, M. S., Reactive processing of nanostructured nickel aluminide intermetallics starting from elemental nanopowders. Intermetallics 2007, 15, 1057-1065.
El-Shobaky, G. A.; Radwan, N. R. E.; El-Shall, M. S.; Turky, A. M.; Hassan, H. M. A., The role of method of preparation of CuO-NiO system on its physicochemical surface and catalytic properties. Colloids and Surfaces A-Physicochemical And Engineering Aspects 2007, 311, 161-169.
Abdelsayed, V.; Panda, A. B.; Glaspell, G. P.; El-Shall, M. S.; Synthesis, passivation and stabilization of nanoparticles, nanorods and nanowires by microwave irradiation, in “Nanoparticles: Synthesis, Stabilization, Passivation and Functionalization”, Editors: R. Nagarajan and T. A. Hatton, ACS Symposium Series Book 2008, 996, 225-247.
Nanoparticles in Astrochemistry: Synthesis and Characterization of Meteorite Dust Nanoparticles, V. Abdelsayed, G. Glaspell, K. Saoud, M. Meot-Ner and M. S. El-Shall, Astrochemistry: From Laboratory Studies to Astronomical Observations, Edited by R. I. Kaiser, P. Bermath, A. M. Mebel, Y. Osamura, and S. Petrie, AIP Conference Proceedings 855, 76-85 (2006).
Nanoparticles: Synthesis, Assembly, Properties and Applications. M. S. El-Shall, McGraw-Hill Year book of Science & Technology, 268-272 (2003).
Prospects for the Study of Gas Phase Polymerization and the Synthesis of Polymers Containing Nanoparticles in Microgravity, Y. B. Pithawalla, J. Gao and M. S. El Shall, in “Polymer Processing in Microgravity”, Editor: John A. Pojman, ACS Symposium Series, Chapter 13, pp.185-202 (2001).
Synthesis and Characterization of Metal and Semiconductor Nanoparticles, M. S. El-Shall and S. Li, in “Advances in Metal and Semiconductor Clusters”, Editor: M. A. Duncan, JAI Press Inc., Volume 4, Chapter 3, 115-177 (1998).
Gas Phase and Cluster Studies of the Early Stages of Cationic Polymerization and the Reactions with Metal Cations, Y. P. Pithawalla and M. S. El-Shall, in “Solvent-Free Polymerization and Processes”, Editors: M. O. Hunt and T. E. Long, ACS Symposium Series, Chapter 15, 232-245 (1998).
Formation of Clusters and Nanoparticles from a Supersaturated Vapor and Selected Properties, M. S. El-Shall and A. S. Edelstein in “Nanomaterials: Synthesis, Properties and Applications”, Editors: A. S. Edelstein and R. C. Cammarata, Institute of Physics Publishing, 1996, Chapter 2, 13-54.
Synthesis of Nanostructured Materials Using Laser Vaporization / Condensation Technique, M. S. El-Shall, S. Li, D. Graiver and U. Pernisz in “Nanotechnology: Molecularly Designed Materials”, Editors: G. Chow and K. E. Gonsalves, ACS Symposium Series 622, Chapter 5, 79-99, 1996.
Patents (Five U.S.)
“Silica Nanoparticles”, M. S. El-Shall, D. Graiver, U. C. Pernisz, US Patent: 5,580,655 (1996).
“Silicon Nanoparticles”, D. Graiver, U. C. Pernisz, M. S. El-Shall. US Patent: 5,695,617 (1997).
“Nanoparticles of Silicon Oxide Alloys”, M. S. El-Shall, D. Graiver, U. C. Pernisz, US Patent: 6,136,156 (2000).
“Nanocrystalline Intermetallic Powders Made by Laser Evaporation”, S. C. Deevi, Y. B. Pithawalla, M. S. El-Shall, US Patent: 6,368,406 (2002).
“Copper and/or Zinc Alloy Nanopowders Made by Laser Vaporization and Condensation”, M. S. El-Shall, S. Deevi, Y. B. Pithawalla, S. C. Deevi, A. C. Lilly, Jr., US Patent: 7,413,725 (2008).