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Showing 1 to 20 of 178 for “"adsorbate"”.
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Orientation of adsorbate-adsorbate complexes using a novel waveguide linear dichroism technique
Made available in DSpace on 2011-05-07T12:30:00Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9210774.pdf: 9143067 bytes, checksum: 78808011bb0bbcb2817b90e5a0e28b5a (MD5) Previous issue date: 1991
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Measurement of Adsorbate Evolution Temperatures and of Adsorbate Effects on Processing and Fired Properties of Submicron Alumina
Made available in DSpace on 2014-12-12T00:32:35Z (GMT). No. of bitstreams: 1 7500385.pdf: 3185521 bytes, checksum: 06ca6a34358e61f3026474c8d422afbc (MD5) Previous issue date: 1974
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Selective excitation of adsorbate vibrations on dissipative surfaces
… regime ("vibrationally mediated chemistry"). For adsorbates on surfaces it has been theoretically predicted that IR preexcitation will lead to higher UV/Vis photodesorption yields and larger cross sections for other photoreactions. In a recent experiment, IR-mediated desorption of molecular …
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LEEDS studies of adsorbate-induced reconstruction of metal surfaces
Using the technique of low-energy electron diffraction (LEED), the structures of three systems have been investigated, where small, electronegative atoms chemisorb and induce reconstruction at a metal surface; these surfaces are designated Ni(111)-(2x2)-0,Cu(110)-(2x3)-N, and Pd(100)-(V5x45)R27°-0. …
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Orbital Level Understanding of Adsorbate-Surface Interactions in Metal Nanocatalysis
… to advance the fundamental understanding of adsorbate-surface interactions on metal nanocatalysts, paving the path toward adsorbate-specific tuning of catalysis.
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Dependence of rare-gas adsorbate dipole moment on substrate work function
"The distinctly different behaviors of rare gas adsorbed on various metals has been a puzzle for more than two decades. On refractory metals, the deduction of the metal work functions is unexpectedly large, while on simple metals, the effect is nearly undetectably small. The ""switching"" theory …
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Surface reaction mechanisms as a function of surface composition, adsorbate coverage, and adsorbate acidity: I. Trimethylgallium on metal-treated silicon. II. Hexafluoropentanedione, methanol, and acetone on copper
… trimethylgallium was determined as a function of adsorbate coverage, surface composition, and surface temperature. As the average of trimethylgallium on Si(100) is increased, the reaction mechanism evolves from intramolecular decomposition, forming methane at very low coverage, to intermolecular …
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The effect of fluorination on the surface chemistry of adsorbate-metal systems
… fluorine) on the surface chemistry of several adsorbate-metal systems. In the first system, the effect of two substituent groups ($-$CH$\sb3$ and $-$F) on the kinetics of the phenyl coupling reaction on the Cu(111) surface has been studied. The electron withdrawing fluorine group in the meta or …
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A radiotracer technique for in situ adsorbate measurements on smooth electrode surfaces
… been developed. In this method, a radiolabeled adsorbate on an electrode is detected by pressing the electrode against a glass scintillator detector at the bottom of an electrochemical cell. Equations which account for the backscattering factor have been developed to calculate the surface …
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Study of Adsorbate Interactions of Alumina Surfaces Using Nuclear Magnetic Resonance Methods
Gamma type alumina (gamma-Al2O3) is a fundamental material in heterogeneous catalysis with a growing demand for environmentally benign solid acid catalysts to replace toxic and corrosive liquid solvents for a wide range of applications including renewable energy production, fine chemicals and …
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Scanning tunneling microscopy and photoemission spectroscopy studies of clean and adsorbate-covered semiconductor surfaces
… stages of interface formation between various adsorbates, as well as, reconstructions occurring on the clean surfaces of Si and Ge. The initial stages of oxidation of the Si(111)-(7 x 7) and Ge(111)-c(2 x 8) surfaces were studied. Images of the same area of each surface were obtained from …
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Material Characterization, Patterning and Adsorbate Induced Modulation of Light Emission of Porous Silicon Produced by Metal -Assisted Electroless Etching
Metal-assisted electroless etching of Pt-patterned Si in HF, H2 O2 and methanol produces photoluminescent porous silicon (PSi). Upon ultraviolet excitation, the peak emission wavelength of PSi can be tuned in the visible spectral range simply by varying the etching conditions. Photoluminescence …
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AN EXPERIMENTAL STUDY OF THE EFFECTS OF SUBSTRATE POROSITY, MORPHOLOGY, AND FLEXIBILITY ON THE EQUILIBRIUM THERMODYNAMICS AND KINETICS OF ADSORPTION FOR ATOMIC AND MOLECULAR ADSORBATES
… between the physical properties of the adsorbate and substrate and the effects of these properties on the thermodynamics and kinetics of adsorption. In addition to being of fundamental interest, the thermodynamics and kinetics of adsorption are important to understand for practical …
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In-Plane Conductance of Thin Films as a Probe of Surface Chemical Environment: Adsorbate Effects on Film Electronic Properties of Indium Tin Oxide and Gold
Changes in the in-plane conductance of conductive thin films are observed as a result of chemical adsorption at the surface. Reaction of the indium tin oxide (ITO) surface with Bronsted acids (bases) leads to increases (decreases) in its in-plane conductance as measured by a four-point probe …
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Photoemission and scanning tunneling microscopy investigation of elemental-semiconductor surfaces
… surfaces. By carefully monitoring the adsorbate-induced changes in the electronic properties at the surface via spectroscopic methods such as photoemission, and by studying the resulting surface structures by scanning tunneling microscopy (STM), a quantitative description of the …
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The adsorption of phenolic and organotin compounds by clays and cation exchanged clays
… of phenols and chlorinated phenols. Strong adsorbate-adsorbent interactions are indicated by adsorption isotherms. Adsorption of phenols and chlorinated phenols by Quat-smectites is greater than that by the Bi Quat-Smectites prepared in this study. It is thought that the quaternary ammonium …
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Modeling Powdered Activated Carbon Performance in Membrane Filtration Systems
… of carbon as a pulse input always yields lower adsorbate concentrations in the membrane permeate. Furthermore, application of the activated carbon to continuous-flow reactors installed upstream of the membranes, and the recirculation to a floc blanket reactor after backwash results in …
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Surface-enhanced Raman spectroscopic studies of the orientation of organonitriles on metal colloids
The orientation of adsorbates on metal colloids was studied by Surface enhanced Raman spectroscopy. We studied the orientation of cyanopyridines, aminomethylpyridines and 4-biphenylcarbonitrile on gold and copper colloids as a function of concentration of the adsorbates. It was found that the …
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