Experimental

Department of Chemistry, Carnegie Mellon University
Ph.D. Chemistry, Northwestern University, Illinois, 2003
Summary:

Our research focuses on fundamental science and engineering questions motivated by the creation of materials on the nanometer scale (1 nm=10-9 m). Our research themes include the synthesis, characterization, and applications of nanoparticles (typically 1-100 nm in size). We are developing chemical methods for synthesizing well defined nanoparticles, including atomically precise nanoclusters, shape- and size-controlled nanocrystals, hybrid nano-architectures, and inorganic/polymer nanocomposites. In-depth characterizations of the physical and chemical properties of nanoparticles and self-assembled nanomaterials are carried out with microscopy and spectroscopy techniques, such as electron microscopy, atomic force microscopy, X-ray crystallography, steady-state and ultrafast spectroscopies, etc. We also develop applications of nanoparticles in areas of catalysis, optics, chemo- and bio-sensing, and photovoltaics, etc.

Selected Publications: 
  1. “Correlating second harmonic optical responses of single Ag nanoparticles with morphology”, Jin, R.; Jureller, J.E.; Kim, H.Y.; Scherer, N.F. J. Am. Chem. Soc.127, 12482 (2005).
  2. “Synthesis of open-ended, cylindrical Au-Ag alloy nanostructures on a Si/SiOx surface”, Zhang, H.; Jin, R.; Mirkin, C.A. Nano Lett., 4, 1493 (2004).
  3. “Thermally-induced formation of atomic Au clusters and conversion into nanocubes”, Jin, R.; Egusa, S.; Scherer, N.F. J. Am. Chem. Soc.126, 9900 (2004).
  4. “Controlling anisotropic nanoparticle growth through plasmon excitation”, Jin, R.; Cao, Y.W.;  Hao, E.; Metraux, G.S.; Schatz, G.C.; Mirkin, C.A.; Nature425, 487 (2003).
  5. “Raman dye-labeled nanoparticle probes for proteins”, Cao, Y.C.; Jin, R.; Nam, J.M.; Thaxton, C.S.; Mirkin, C.A. J. Am. Chem. Soc.125, 14676 (2003).
Most Cited Publications
  1. "Photoinduced conversion of silver nanospheres to nanoprisms", R Jin, YW Cao, CA Mirkin, KL Kelly, GC Schatz, JG Zheng, science, 294, 1901 (2001).
  2. "Nanoparticles with Raman spectroscopic fingerprints for DNA and RNA detection", YWC Cao, R Jin, CA Mirkin, Science 297, 1536 (2002).
  3. "Controlling anisotropic nanoparticle growth through plasmon excitation", R Jin, YC Cao, E Hao, GS Métraux, GC Schatz, CA Mirkin, Nature 425, 487 (2003).
  4. "Correlating the crystal structure of a thiol-protected Au25 cluster and optical properties", M Zhu, CM Aikens, FJ Hollander, GC Schatz, R Jin, Journal of the American Chemical Society 130 , 5883 (2008).
  5. "What controls the melting properties of DNA-linked gold nanoparticle assemblies?", R Jin, G Wu, Z Li, CA Mirkin, GC Schatz, Journal of the American Chemical Society 125, 1643 (2003).
Recent Publications
  1. "Influence of Atomic-Level Morphology on Catalysis: The Case of Sphere and Rod-Like Gold Nanoclusters for CO2 Electroreduction", Shuo Zhao, Natalie Austin, Mo Li, Yongbo Song, Stephen D. House, Stefan Bernhard, Judith C. Yang, Giannis Mpourmpakis, and Rongchao Jin, ACS Catal., 8, 4996 (2018).
  2. "Sharp Transition from Nonmetallic Au246 to Metallic Au279 with Nascent Surface Plasmon Resonance", T Higaki, M Zhou, K Lambright, K Kirschbaum, MY Sfeir, R Jin, Journal of the American Chemical Society (2018).
  3. "Kernel Tuning and the Resulting Influence on Optical/Electrochemical Gaps of Bimetal Nanoclusters", R JIN, Acta Physico-Chimica Sinca (2018).
  4. "Toward Atomically Precise Nanoclusters and Nanoparticles", R JIN, Acta Physico-Chimica Sinca 34, 737 (2018).
  5. "Excited-State Behaviors of M1Au24 (SR) 18 Nanoclusters: The Number of Valence Electrons Matters", M Zhou, C Yao, MY Sfeir, T Higaki, Z Wu, R Jin, The Journal of Physical Chemistry C (2018).
  6. "Chiral Ag 23 nanocluster with open shell electronic structure and helical face-centered cubic framework", C Liu, T Li, H Abroshan, Z Li, C Zhang, HJ Kim, G Li, R Jin, Nature communications 9, 744 (2018).

 

Mechanical Engineering & Materials Science
PhD, University of Kentucky
Summary:

Heng Ban's research covers topics in thermal-fluid sciences, materials properties, sensors and measurement, and energy sciences. His recent focus has been to understand the relationship between material microstructural change and its thermal performance, particularly experimental and computational material thermophysical properties and measurement technique development. The research has applications in nuclear fuels and materials, manufacturing, micro-scale measurements, and development of hot-cell and/or in-pile sensors and instrumentations.

Most Cited Publications
  1.  "Convection—diffusion controlled laminar micro flames," H. Ban,  S. Venkatesh, K. Sait, Journal of Heat Transfer, 116, 954 (1994)
  2. "Impacts of pH and ammonia on the leaching of Cu(II) and Cd(II) from coal fly ash," J. Wang, H.  Ban, X. Teng, H. Wang, K. Ladwig, Chemosphere, 64, 1892 (2006)
  3. "Characterizing the metal adsorption capability of a class F coal fly ash,"J. Wang, X.b,  Wang, H. Teng, H. Ban, Environmental Science and Technology, 38, 6710 (2004)
  4. "Dry triboelectrostatic beneficiation of fly ash," H. Ban, T.X. Li, J.C. Hower, J.L. Schaefer,  J.M. Stencel,  Fuel, 76, 801 (1997)
  5. "Adsorption of arsenic (V) onto fly ash: A speciation-based approach," Wang, Jianmin, Tian Wang, Joel G. Burken, Charles C. Chusuei, Heng Ban, Ken Ladwig, C. P. Huang. Chemosphere 72, no. 3 (2008): 381-388.

 

Recent Publications
  1. " Sensitivity analysis of VERA-CS and FRAPCON coupling in a multiphysics environment," C. Blakely,  H. Zhang, & H. Ban, Annals of Nuclear Energy, 111, 683 (2018)
  2.  "Thermal Characterization of Alkali Treated Kenaf Fibers and Kenaf-Epoxy Composites," , L. Gardner, T. Munro, E. Villarreal, K. Harris, T. Fronk, & H. Ban, Fibers and Polymers 19, 393 (2018)
  3.  "From lignocellulose to biocomposite: Multi-level modelling and experimental investigation of the thermal properties of kenaf fiber reinforced composites based on constituent materials," J. Guillou, D.N. Lavadiya, T. Munro, T. Fronk, & H. Ban, Applied Thermal Engineering, 128, 1372 (2018)
  4. "A general method to analyze the thermal performance of multi-cavity concentrating solar power receivers," A. Fleming, C. Folsom, H. Ban, & Z. Ma, Solar Energy, 150, 608 (2017) 
  5.  "A new measurement approach for interface thermal resistance using frequency-scan photothermal reflectance technique." Z. Hua, & H. BanInternational Journal of Thermal Sciences, 117, 59 (2017)
Department of Chemical and Petroleum Engineering, Swanson School of Engineering
PhD, chemistry, California Institute of Technology (Caltech)
Summary:

The McKone group combines basic and applied research in experimental electrochemistry to advance promising technologies for sustainable energy and next-generation electronics. To this end, we are pursuing research projects related to electrochemical catalysis, battery energy storage, solar photochemistry, 2-dimensional semiconductors, and interdisciplinary chemical reaction engineering & design.

Our work draws on an interdisciplinary set of tools and expertise, including:

  • electroanalytical chemistry
  • colloidal, ceramic, and metallurgical materials synthesis
  • inorganic/organometallic chemistry
  • surface science
  • optical and x-ray spectroscopies
  • nanofabrication and characterization
  • engineering analysis and design
Most Cited Publications
  1. “Solar water splitting cells,”” M. G. Walter, E. L. Warren, J. R.  McKone, S. W. Boettcher, Q Mi, E. A. Santori,and Nathan S. Lewis, Chemical reviews 110 (11), 6446 (2010)
  2. “Nanostructured nickel phosphide as an electrocatalyst for the hydrogen evolution reaction,” E. J. Popczun, J. R. McKone, C. G. Read, A. J. Biacchi, A. M. Wiltrout, N. S. Lewis and Raymond E. Schaak, Journal of the American Chemical Society 135, 9267 (2013)
  3. “Photoelectrochemical hydrogen evolution using Si microwire arrays,” S. W. Boettcher, E. L. Warren, M. C. Putnam, E. A. Santori, D. Turner-Evans, Michael D. Kelzenberg, Michael G. Walter, James R. McKone, Bruce S. Brunschwig, Harry A. Atwater, and Nathan S. Lewis, Journal of the American Chemical Society 133, 1216 (2011)
  4. “Will solar-driven water-splitting devices see the light of day?,” J. R. McKone, N . S . Lewis, H . B. Gray, Chemistry of Materials 26, 407 (2014)
  5. “Ni–Mo nanopowders for efficient electrochemical hydrogen evolution,” J. R. McKone, B. F. Sadtler, C. A. Werlang, N. S. Lewis, H. B. Gray, ACS catalysis 3, 166 (2013)
Recent Publications
  1. "A Benchmarking Approach for Routine Determination of Flow Battery Kinetics", Tejal Sawant, James McKone,ChemRxiv. (2018).
  2. “Symmetric redox flow battery containing organic redox active molecule,” R Potash, J. R. McKone, H. D. Abruna, S. Conte, US Patent App. 15/128, 550 (2017)
  3. “Solar flow battery,” J. R. McKone, H. D. Abruna, US Patent App. 15/128,321 (2017)
  4. “Electrochemical Hydrogen Evolution at Ordered Mo7Ni7,” Peter M. Csernica, James R. McKone, Catherine R. Mulzer, William R. Dichtel, Hector D. Abruna,  and Francis J. DiSalvo, ACS Catal. 7, 3375 (2017)
  5. Solar energy conversion, storage, and release using an integrated solar-driven redox flow battery," James R. McKone, Francis J. DiSalvob and Hector D. Abruna, J. Mater. Chem. A, 5, 5362 (2017)
  6. "Translational Science for Energy and Beyond," James R. McKone, Debbie C. Crans, Cheryl Martin, John Turner, Anil R. Duggal, and Harry B. Gray, Inorg. Chem., 55, 9131 (2016)
Department of chemistry, University of Pittsburgh
Ph.D. in Chemistry: Cornell University,1997
Summary:

Saxena Group is focused on developing Fourier Transform electron spin resonance and its application to otherwise inaccessible problems in biophysics. The coupling of electron spin angular momentum to its environment—as revealed by the ESR spectrum—provides rich information about the electronic, structural and dynamical properties of the molecule. Saxena group creates the methods that measure the precise distance between two units in a protein, in order to determine their folding patterns and conformational dynamics. These ESR Spectroscopic Rulers— based on multiple quantum coherences and double resonance experiments—are unique in that they resolve distances in the 1-16 nm length scale even on bulk amorphous materials. Much of this work is based on the use of first-principles theory to develop new experimental protocols and to analyze experimental results.

His group continues to develop applications of these spectroscopic rulers that range from capturing the essence of structural changes - such as misfolding - in proteins, to measuring the atomic-level details of ion-permeation in a ligand gated ion-channel. The main projects of his group include:

  • Pulsed ESR methods to measure distance constraints in systems containing paramagnetic metals
  • Measurement of structural and dynamical determinants of the protein-DNA interactions and functional dynamics in pentameric ligand gated ion-channels.
  • Application of the spectroscopic ruler to measure and predict global structures of nanostructured materials.
  • Role of metals in aggregation of Amyloid-β peptide.
Most Cited Publications
  1. "Nonlinear-least-squares analysis of slow-motion EPR spectra in one and two dimensions using a modified Levenberg–Marquardt algorithm," D. E. Budil, S. Lee, S. Saxena, J. H. Freed, Journal of Magnetic Resonance, Series A 120, 155 (1996)
  2. "Amplification of xenon NMR and MRI by remote detection," A. J. Moulé, M. M. Spence, S. I. Han, J. A. Seeley, K. L. Pierce, S Saxena, A. Pines. Proceedings of the National Academy of Sciences 100, 9122 (2003)
  3. "Double quantum two-dimensional Fourier transform electron spin resonance: distance measurements," S. Saxena, J. H. Freed, Chemical physics letters 251,102 (1996)
  4. "Direct evidence that all three histidine residues coordinate to Cu (II) in amyloid-β1− 16," B. Shin, S. Saxena, Biochemistry 47, 9117 (2008)
  5. "Theory of double quantum two-dimensional electron spin resonance with application to distance measurements," J Freed, S. Saxena, Jounal of Chemiical Physics 107, 1317-1340 (1997).
Recent Publications
  1. “ESR shows that the C-terminus of Ligand Free Human Glutathione S-Transferase A1-1 exists in two conformations,” M. J. Lawless, J. R. Pettersson, G. S. Rule, F. Lanni, S. SaxenaBiophysical Journal 114, 592 (2018)
  2. “The Cu(II)-nitrilotriacetic acid complex improves loading of a-helical double-histidine sites for precise distance measurements by pulsed ESR,” S. Ghosh, M. J. Lawless, G. S. Rule, S. SaxenaJ. Magn. Reson., 286, 163 (2018)
  3. “On the use of Cu(II)-iminodiacetic acid complex in double-Histidine based distance measurements by pulsed electron spin resonance,” M. J. Lawless, S. Ghosh, T. F. Cunningham, A. Shimshi, and S. SaxenaPhys. Chem. Chem. Phys., 19, 20959 (2017)
  4. “An analysis of nitroxide based distance measurements by pulsed ESR spectroscopy in cell-extract and in-cell,” M. J. Lawless, A. Shimshi, T. F. Cunningham, M. Kinde, P. Tang, and S. SaxenaChemPhysChem., 18, 1653 (2017)
  5. “Nucleotide-independent Cu(II)-based distance measurements in DNA by pulsed ESR,” M. J. Lawless, J. L. Sarver, S. Saxena, Angew Chem, 56, 2115 (2017)

What molecular properties give rise to a strong piezoelectric response?

  • By Burcu Ozden
  • 22 November 2017

In this study Geoffrey R. Hutchison and his colleagues tried to answer the question of " What molecular properties give rise to a strong piezoelectric response?"  To do so, they systematically probe the interplay among peptide chemical structure, folding propensity, and piezoelectric properties, uncovering in the process new insights into the origin of peptide electromechanical response. They have designed variety of peptides and peptoids and test the effect of molecular properties on piezoelectric response via serious measurements including ircular dichroism (CD), Polarization-modulated infrared reflection−absorption spectroscopy (PM-IRRAS), tomic force microscopy (AFM), piezo-force microscopy (PFM), and X-ray photoelectron spectroscopy (XPS) measurements. They showed backbone rigidity is an important determinant in peptide electromechanical responsiveness. 

New Era in Thermal Scanning Probe Lithography

  • By Burcu Ozden
  • 15 November 2017

Tevis Jacobs and his collaborators from IBM and SwissLitho were achieved sub-10 nanometer feature size in Silicon using thermal scanning probe lithography. In this work, they  the t-SPL parameters that influence high-resolution patterning on the transfer stack and demonstrate that sub-15 nm half-pitch resolution patterning and transfer by t-SPL are feasible. They found that the resolution in t-SPL is limited by the extent of the plastic zone in thermo-mechanical indentation on the pattern transfer stack because, at temperatures approaching the resist’s decomposition temperature, the line shape widens, reducing the achievable resolution. They achieved reliable transfer of patterned dense lines down to 14 nm half-pitch and in the best case 11 nm half-pitch. Furthermore, evidently they showed that an enhanced resolution below 10 nm half-pitch might be possible on a mechanically different transfer stack.

The Ability to Electrically Tune the Dimensionality of mesoscopic LAO/STO Channels

  • By Burcu Ozden
  • 27 October 2017

In this work, authors used conductive atomic force microscope (c-AFM) lithography in which the conduction is controlled by surface protons that are distributed on the LAO surface. They have created two conducting channel with varying witdhs as 10 and 200nm on a  LAO/STO heterostructures grown by pulsed-laser deposition. They designed the the devices in a way that two conducting channels connected in series with two leads and voltage probes. By using silver epoxy on the bottom of the STO substrate they created contacts for a back gate voltage. They investigated changes in the magnetotransport properties on the channels with different widths by varying back gate voltage and applied magnetic field. They measured the conductance for both narrow and wide channels and demonstarted the hysteresis of both channels with back gating. Saturation of the conductance at higher gate voltages was also shown. They were able to demonstrate dimensional crossover from 2d to 1D behavior with their magnetoconductance measurements.



New Technique for Measuring the Layer-Resolved Charge Density

  • By Burcu Ozden
  • 25 October 2017

Recently Benjamin M. Hunt and his colleagues developed a new technique for measuring the layer-resolved charge density, from which they can map layer polarization of the valley or spin quantum numbers in bilayer graphine and other two dimensional materials. In this study, they demonstrated direct measurement of valley and orbital levels in bilayer graphite. They have detected that the four valley and orbital components have different weights on the two layers of the bilayer. By using Hunt’s technique one can probe layer, valley, and spin polarization quantitatively in other atomic layered materials, including twisted bilayer graphene and both homobilayer and heterobilayer of transition metal dichalcogenide

 

Department of Mechanical Engineering, Carnegie Mellon University
Ph.D., Materials Science and Engineering, The University of Texas at Austin, 2012
Summary:

Our group studies the role of external electromagnetic fields, such as microwave and millimeter waves in accessing regions of the free energy/phase space diagram of a material, hitherto unavailable to conventional synthesis routes. Examples include structurally integrated ordered-disordered ceramic oxides and oxide-polymer composites with unexpected electronic and mechanical properties, adaptive oxides for resistive switching, supersaturated mixed oxide solid solutions with hierarchical structure. An additional benefit involves employing low temperatures for directly processing such materials on fibers and flexible, light-weight substrates for applications in sensing and energy harnessing, storage.

We have extensive experience in the synthesis of inorganic and organic thin films using solution based sol-gel/microwave-assisted synthesis and chemical vapor deposition (CVD) polymerization. We carry out microscopic, spectroscopic and analytical characterization of thin films, as well micro/nano-fabrication processes for building and testing of photovoltaic, battery, and sensing devices.

Selected Publications: 
  1. “Unlocking the structure of mixed amorphous-crystalline ceramic oxide films synthesized under low temperature electromagnetic excitation,” N. Nakamura, M. W. Terban, S. J. L. Billinge, B. Reeja-Jayan, Journal of Materials Chemistry A (2017) (in press). 
  2. “Regression Design for Low-Temperature Microwave-Assisted Crystallization of Ceramic Thin Films”, N. Nakamura, J. Seepaul, J. Kadane, B. Reeja-Jayan, Applied Stochastic Models in Business and Industry, 33, 314 (2017).
  3. “Microwave-assisted Low Temperature Thin Film Growth in Solution”, B. Reeja-Jayan, K. L. Harrison, K. Yang, Chih-Liang Wang, A. Yilmaz, and A. Manthiram, Scientific Reports, 2, 1003 (2012). 
  4. “Organic Passivation of Silicon Through Multifunctional Polymeric Interfaces”, M. L. Castillo, A. Ugur, H. Sojoudi, N. Nakamura, Z. Liu, F. Lin, R. E. Brandt, T. Buonassisia, B. Reeja-Jayan, K. K. Gleason, Solar Energy Materials and Solar Cells, 160, 470 (2017).
  5. “A Group of Cyclic Siloxane and Silazane Polymer Films as Nanoscale Electrolytes for Microbattery Architectures”, B. Reeja-Jayan, N. Chen, J. Lau, J. A. Kattirtzi, P. Moni, A. Liu, I. G. Miller, R. Kayser, A. P. Willard, B. Dunn, and K. K. Gleason,  Macromolecules, 48, 5222 ( 2015).
Most Cited Publications
  1. "Carbon-coated high capacity layered Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathodes ,"Jun Liu, Qiongyu Wang, B. Reeja-Jayan, Arumugam Manthiram, Electrochemistry Communications,12, 750 (2010)
  2. "Controlling the Growth and Luminescence Properties of Well-Faceted ZnO Nanorods," E. De la Rosa, S. Sepu´lveda-Guzman, B. Reeja-Jayan, A. Torres, P. Salas, N. Elizondo, and M. Jose Yacaman, J. Phys. Chem. C ,111, 8489 (2017)
  3. "Conductive Surface Modification with Aluminum of High Capacity Layered Li[Li0.2Mn0.54Ni0.13Co0.13]O2 Cathodes," Jun Liu, B. Reeja-Jayan, and Arumugam Manthiram, J. Phys. Chem. C,114, 9528 (2010)
  4. "Synthesis of assembled ZnO structures by precipitation method in aqueous media,"S.Sepulveda-GuzmanB.Reeja-JayanE.de la RosaA.Torres-Castro,V.Gonzalez-Gonzalez, M.Jose-YacamanMaterials Chemistry and Physics, 15, 172 (2009)
  5. "Structural Characterization and Luminescence of Porous Single Crystalline ZnO Nanodisks with Sponge-like Morphology," B. Reeja-Jayan, E. De la Rosa, S. Sepulveda-Guzman, R. A. Rodriguez, and M. Jose Yacaman, J. Phys. Chem. C,112, 240 (2008)
Recent Publications
  1. “Organic Passivation of Silicon Through Multifunctional Polymeric Interfaces”, M. L. Castillo, A. Ugur, H. Sojoudi, N. Nakamura, Z. Liu, F. Lin, R. E. Brandt, T. Buonassisia, B. Reeja-Jayan, K. K. Gleason, Solar Energy Materials and Solar Cells, 160, 470 (2017).
  2. “Unlocking the structure of mixed amorphous-crystalline ceramic oxide films synthesized under low temperature electromagnetic excitation,” N. Nakamura, M. W. Terban, S. J. L. Billinge, B. Reeja-Jayan, Journal of Materials Chemistry A (2017) (in press). 
  3. “Regression Design for Low-Temperature Microwave-Assisted Crystallization of Ceramic Thin Films”, N. Nakamura, J. Seepaul, J. Kadane, B. Reeja-Jayan, Applied Stochastic Models in Business and Industry, 33, 314 (2017).
  4. “A Group of Cyclic Siloxane and Silazane Polymer Films as Nanoscale Electrolytes for Microbattery Architectures”, B. Reeja-Jayan, N. Chen, J. Lau, J. A. Kattirtzi, P. Moni, A. Liu, I. G. Miller, R. Kayser, A. P. Willard, B. Dunn, and K. K. Gleason,  Macromolecules, 48, 5222 (2015).
  5. "Oligomeric interface modifiers in hybrid polymer solar cell prototypes investigated by fluorescence voltage spectroscopy," B Reeja-Jayan, KA Koen, RJ Ono, DAV Bout, CW Bielawski, A Manthiram, Physical Chemistry Chemical Physics 17 (16), 10640-10647 (2015)
Department of Chemical Engineering, Carnegie Mellon University
Ph.D., Chemistry, University of California, Berkeley, 1985
Summary:

Professor Gellman's group uses experimental methods to study processes occurring on surfaces such as the bonding of molecules to metal surfaces, surface structure, reaction kinetics, catalysis, friction, and lubrication.  The use of surface science methods to create and study well-defined surfaces allows Professor Gellman's group to investigate surface chemistry relevant to these processes at the most fundamental level.

Professor Gellman’s group has pioneered the study of enantioselective surface chemistry on naturally chiral metal surfaces.  These surfaces are high Miller index planes that lack mirror symmetry and therefore exist as two enantiomorphs.  Recent work using D- and L-tartaric acid adsorbed on several Cu(hkl)R&S surfaces has demonstrated that one can achieve enormously high enantiospecific reaction rates via autocatalytic surface explosion mechanisms. Other work has used 13C isotopically labelled L-aspartic acid to monitor directly the enantioselective separation of DL-aspartic acid on Cu(3,1,17)R&S surfaces.  This work generates insight into some of the fundamental phenomena that lead to enantioselective adsorption and catalysis on chiral surfaces.

Recent work in Professor Gellman’s laboratory has focussed effort on the development of instrumentation and methods for high throughput study of surface phenomena.  Study of the surface science of multicomponent materials such as alloys is complicated by the fact that one needs to prepare, characterize and study many samples of varying composition.  Gellman’s group has worked to overcome this bottleneck by developing tools for the preparation of Composition Spread Alloy Films.  These are alloy films that have composition gradients parallel to their surfaces such that a 1x1 cm2 sample contains all possible compositions of a ternary alloy, AxByC1-x-y with x = 0 -> 1, y = 0 -> 1-x.  Spatially resolved materials and surface characterization methods (SEM, EDX, EBSD, XPS, UPS, LEIS, etc.) can then be used to map and study composition dependent phenomena such as surface segregation, catalysis, dewetting, and oxidation across the entire alloy composition space.

Another body of recent work exploits the use of spherically curved single crystal surfaces to conduct high throughput studies of structure sensitive surface chemistry that span surface orientations continuously.  This circumvents the need for study of many single crystals exposing surfaces of a single crystallographic orientation.  Surface Structure Spread Single Crystals expose a distribution of different surface orientations spanning a continuous region of the stereographic projection of all possible surface orientations.  Spatially resolved surface analysis methods such as STM, XPS and UPS can be used to study problems in surface structure, surface physics and structure sensitive surface chemistry

Selected Publications: 
  • "The Adsorption of Chiral Alcohols on "Chiral" Metal Surfaces," C.F. McFadden, P.S. Cremer, A.J. Gellman,  Langmuir, 12(10), 2483 (1996) 
  • “Polymers at Interfaces: Using Atom Transfer Radical Polymerization in the Controlled Growth of Homopolymers and Block Copolymers from Silicon Surfaces in the Absence of Untethered Sacrificial Initiator,' K. Matyjaszewski, P.J. Miller, N. Shukla, B. Immaraporn, A.J. Gellman, B.B. Luokala, T.M. Siclovan, G. Kickelbick, T. Vallant, H. Hoffmann, T. Pakula,  Macromolecules 32 (26), 8716 (1999) 
  • “Kinetics and Energetics of Oligomer Desorption from Surfaces,” K.R. Paserba, A.J. GellmanPhys. Rev. Lett.86(19), 4338 (2001) 
  • “Effects of Conformational Isomerism on the Desorption Kinetics of n-Alkanes from Graphite,” K.R. Paserba, A.J. Gellman, J. Chem. Phys. 115(14), 6737 (2001) 
  • “Enantioselective Separation on a Naturally Chiral Surface,”J. Horvath, P. Kamakoti, A. Koritnik, D.S. Sholl, A.J. GellmanJ. Amer. Chem. Soc. 126(45), 14988 (2004)
  • “The Real Structure of Naturally Chiral Cu{643},”A.E. Baber, A.J. Gellman, D.S. Sholl, E.C.H. Sykes, J. Phys. Chem. C  112(30), 11086 (2008)
Most Cited Publications
  1. "The Adsorption of Chiral Alcohols on "Chiral" Metal Surfaces," C.F. McFadden, P.S. Cremer, A.J. Gellman,  Langmuir, 12(10), 2483 (1996) 
  2. “Kinetics and Energetics of Oligomer Desorption from Surfaces,” K.R. Paserba, A.J. GellmanPhys. Rev. Lett.86(19), 4338 (2001) 
  3. “Enantioselective Separation on a Naturally Chiral Surface,”J. Horvath, P. Kamakoti, A. Koritnik, D.S. Sholl, A.J. GellmanJ. Amer. Chem. Soc. 126(45), 14988 (2004)
  4. "Enantiospecific desorption of R-and S-propylene oxide from a chiral Cu (643) surface," Horvath, Joshua D., Andrew J. Gellman, J. Amer. Chem. Soc. 123, 32 (2001)
  5. "Enantiospecific desorption of chiral compounds from chiral Cu (643) and achiral Cu (111) surfaces," Horvath, Joshua D., Andrew J. Gellman, J. Amer. Chem. Soc.124, 10 (2002)
Recent Publications
  1. “Enantiomeric Separations of Chiral Pharmaceuticals using Chirally Modified Tetrahexahedral Au Nanoparticles,” N. Shukla, D. Yang, A.J. GellmanSurface Science, 648, 29, (2016)
  2. “Xe Adsorption Site Distributions on Pt(111), Pt(221) and Pt(531),” A.J. Gellman, L.D. Baker, B.S. Holsclaw, Surface Science 646, 83 (2016)
  3. “Thermal interface conductance across metal alloy-dielectric interfaces,” J.P. Freedman, X. Yu, R.F. Davis, A.J. Gellman, J.A. Malen, Physical Review - B 93, 035309 (2016),
  4. “An Atomic-scale Picture of the Composition, Decay and Oxidation of 2D Radioactive Films,” A. Pronschinske, P. Pedevilla, B. Coughlin, C.J. Murphy, F.R. Lucci, M.A. Payne, A.J. Gellman, A. Michaelides, E.C.H. Sykes, ACS Nano 10, 2152 (2016) 
  5. “Editorial: Special issue dedicated to Gabor Somorjai’s 80th birthday,” A.J. Gellman, R.M. Rioux, P.C. Stair,  Surface Science 648, 1, (2016)

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