Global ETD Search
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Showing 1 to 18 of 18 for “"ADSORBED MOLECULES"”.
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Infrared spectra of adsorbed molecules
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1960.
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LASER-RAMAN ΦΑΣΜΑΤΑ ΟΥΣΙΩΝ ΕΝ ΠΡΟΣΡΟΦΗΣΕΙ
… C6H6-CLL4 AND C6H6-CHCL3. RAMAN SHIFTS OF THE ADSORBED MOLECULES WERE OBSERVED AND COMPARED WITH THE PURE SUBSTANCES. CHANGES OF THE RELATIVE INTENSITES AND APPEARENCE OF NEW BANDS WERE ALSO OBSERVED IN THERAMAN SPECTRA OF THE ADSORBED SUBSTANCES WHICH ARE NOT SHOWN IN THE RAMAN SPECTRA OF THE …
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Nuclear magnetic resonance study of the structure of simple molecules adsorbed on metal surfaces: Acetylene on platinum
… to determine the structure of acetylene (HC~CH) adsorbed at room temperature on small platinum particles by studying the l3c_13c, l3C_1H, and lH_1H dipolar interactions among the nuclei in the adsorbed molecules. We find a model of 77% CCH2 and 23% HCCH to be the only one consistent with all of …
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Nuclear Magnetic Resonance Study of the Structure of Simple Molecules Adsorbed on Metal Surfaces: Acetylene on Platinum (Slow Beat, Double Resonance, Multi Quantum)
… the structure of acetylene (HC(TBOND)CH) adsorbed at room temperature on small platinum particles by studying the ('13)C-('13)C, ('13)C-('1)H, and ('1)H-('1)H dipolar interactions among the nuclei in the adsorbed molecules. We find a model of 77% CCH(,2) and 23% HCCH to be the only one …
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The Membrane Topology of the Microsomal Cytochromes P450: Interfacial Characterization of Protein Structure
… the effect of steric interactions between pre-adsorbed molecules. The results indicate that P450 does in fact contain a peripheral binding interaction. However, in order to determine an accurate binding affinity, additional factors must be incorporated into the kinetic model."
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Rational Design and Advanced Fabrication of Metallic Nanostructures for Surface-Enhanced Raman Spectroscopy
… signal of the vibrational fingerprints of the adsorbed molecules onto the metallic surface. In this Thesis, the rational design and fabrication of gold nanostructures optimized to probe molecular systems, at the monolayer level in a variety of configurations, is described. Using advanced …
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Optical Studies of Ordered Monomolecular Layers: Ab Initio Simulation and Experiment
… of anchoring properties for liquid crystal (LC) molecules adsorbed on a solid substrate, using dual polarization interferometry (DPI). A new theoretical framework is designed based on the dual polarization interferometer for the detection of anisotropic information and the average anchoring angle …
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Spectroscopic Studies of Small Molecule Adsorption and Oxidation on TiO2-Supported Coinage Metals and Zr6-based Metal-Organic Frameworks
… the interactions between catalytic surfaces and adsorbed molecules is imperative to the rational design of new materials for catalytic, sorption and gas separation applications. Experiments that probed the chemistry at the gas-surface interface were employed through the utilization of in situ …
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Carrier manipulation in graphene/ferroelectric hybrid structures
… suffered from extrinsic hysteresis effects from adsorbed molecules screening any coupling between the graphene charge carriers and the ferroelectric polarization. The experimental methods utilized to overcome these challenges are introduced for device fabrication and characterization. The …
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Spectroscopic Studies of Small Molecule Oxidation Mechanisms on Cu/TiO2 Aerogel Surfaces
… the interactions between material surfaces and adsorbed molecules is developed. In situ infrared spectroscopy and mass spectrometry methods were employed to probe interactions at the gas-surface interface of oxide-supported metal nanoparticle materials. High vacuum conditions allowed for …
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The role of repulsive interaction in molecular self-assembly on insulating surfaces
… research, the behaviour and interaction of molecules on a surface and the resulting system’s properties are investigated. The properties depend, among other things, on the structure formed by the adsorbed molecules. The molecules can self-assemble, driven by attractive and repulsive …
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The surface effects of alkali halides in the infrared
… the theory for the side band. A model with adsorbed molecules on the surface is presented but fails to give quantitative agreement with the angular polarization dependence observed. However, it does give reasonable values for the refractive index of the thin film. A model of an absorbing …
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The ultra-selective hydrogenation of Furfural on PtCu supported bimetallic nanoparticles and on Pt(111) under ultra-high vacuum
… orientation and hydrogen bonding networks of the adsorbed molecules. Liquid phase experimentation on Pt nanoparticles, dispersed on a wide range of oxide supports, show that Pt is a very active hydrogenation catalyst even at very mild temperature and pressure conditions. The reaction was found to …
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Surface glassy dynamics and single-molecule absorption of quantum dots detected by scanning tunneling microscopy
… and energy transfer between QDs and other molecules are important for applications in biological imaging, solar cells and photocatalysis. In the second part of this thesis, optically assisted STM was employed to investigate absorption and intermolecular energy transfer between single QDs …
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Graphene Based Chemical and IR Sensors and Correlated Carrier Transport
… and transport properties are readily affected by adsorbed impurities, which can open up applications of these films in a wide range of sensor devices. Indeed, a wide variety of graphene based chemical sensors devices have been reported for sensing toxic gases, chemicals, explosives, and radiation, …
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The effect of zeolite type on the hydrocracking of long n-paraffins
… of large, bulky polycyclic and highly branched molecules in the feedstock. Fischer-Tropsch wax exhibits only minimal branching, and it was hence the aim of this investigation to determine whether zeolites with pores smaller than those utilised in the hydrocracking of crude oil derived …
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Spectroscopic Studies of Abiotic and Biological Nanomaterials: Silver Nanoparticles, Rhodamine 6G Adsorbed on Graphene, and c-Type Cytochromes and Type IV Pili in Geobacter sulfurreducens
… nanoparticles, the dye molecule rhodamine 6G adsorbed on graphene, and the type IV pili and c-type cytochromes produced by the dissimilatory metal-reducing bacterium Geobacter sulfurreducens. Although these systems are quite different in some ways, they can all be considered examples of …
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Electronic properties and surface chemistry of vanadium oxide systems: New insights from synchrotron X-ray techniques
… which produce many of the important organic molecules most chemists take for granted. The work presented in this thesis examines VO2 films on oxide substrates with these two perspectives in mind, using complementary synchrotron X-ray spectroscopy techniques to investigate their chemistry …