Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"molecular adsorption"”.
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Nanomaterial and molecular adsorption onto complex surfaces
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-08-01
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Sensing Molecular Adsorption Through Interfacial Electron Scattering in Atom -Scale Junctions
… junction capability to measure small numbers of adsorption/desorption events makes a powerful case for pushing the limits of sensitivity for electrical measurements of single molecule events.
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Molecular adsorption at solid/liquid interfaces using self-assembled monolayer films
… Properties of wetting, corrosion inhibition, and molecular recognition provide convenient examples. To investigate such interactions at the molecular level, self-assembled monolayers (SAMs) have been employed as a model system as they offer the ability to produce well-defined organic surfaces of …
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Probing molecular adsorption on nobel metal nanosurfaces with surface-enhanced raman spectroscopy
… theme of this thesis is “ the exploration of molecular adsorption on plasmonic metal NPs via surface-enhanced Raman spectroscopy (SERS)”. The first work mainly focus on understanding and rationalizing the competitive adsorption of binary adsorbates on nanoparticles. 3D mathematic models which …
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Effects of Substrate and Molecular Adsorption on Raman Scattering From Individual Single -Walled Carbon Nanotubes
We have explored effects of molecular adsorption, either un-intentional (from ambient environment) or intentional and substrate on resonance Raman scattering measurements on isolated SWCNTs. By correlating Raman scattering measurements with electronic properties of nanotubes, we show that …
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NMR as a probe for molecular adsorption on metal surfaces in electrochemical environments and at electrified interfaces
… to the applied electric field. Further, the adsorption of CH$\sb3$CN on platinum in these electrochemical environments has been investigated by choosing specific nuclei as probe for the relaxation time measurements.
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Dynamics of molecular adsorption : I--collision induced dissociative chemisorption and desorption of CH4ON Ni(111), II--adsorption of CO and O2ON Ni(111) at 8 K
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1988.
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From Growth to Electronic Structure of Dipolar Organic Semiconductors on Coinage Metal Surfaces
… complex and depends on important factors such as molecular adsorption configuration, surface/molecule coupling strength, reactivity of the substrate, molecular electrostatics, and local film structure. I demonstrate the fundamental capability of the image potential states and resonances in probing …
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Molecular oxygen adsorbates at a Au/Ni(111) surface alloy and their role in catalytic CO oxidation at 70 - 250 K
Oxygen is observed to adsorb molecularly on 0.13 - 0.27 ML Au/Ni(1 111) surface alloys at 77 K, in stark contrast to dissociative adsorption on Ni and no adsorption on Au surfaces. Molecular 02 adsorbates on the Au/Ni(111) surface alloy are identified by their 0=0 vibrational modes at 790, 850 and …
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Probing the Hydrogen Bonding Interaction at the Gas-Surface Interface using Dispersion Corrected Density Functional Theory
… sulfur mustard and its less toxic mimics undergo molecular adsorption to amorphous silica. Hydrogen bonding can occur between surface silanol groups and either the sulfur or chlorine atom of the adsorbates, and the calculations indicate that the binding energies for the two hydrogen bond acceptors …
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Single-walled carbon nanotubes as near infrared fluorescent sensors : characterization, biological and analytical applications
… excitons in SWNT can amplify the detection of molecular adsorption to where single-molecule discrimination is realizable, even from within living cells and tissues.
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Gold Nanoshells: Synthesis and Applications to In Situ SERS
… (SERS) is a powerful technique for probing molecular adsorption and reaction at the solid-liquid interface due to its very high surface sensitivity, wide applicable frequency range, and relative insensitivity to water. However, a low SERS activity and poor uniformity of roughened Au …
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Effect of interface structure on film polarization and surface chemistry in ultra-thin TiO2/BaTiO3 Heterostructures
… affect the surface chemistry TiO2 thin film and adsorption energy of water molecules on the surface. However, thin-film perovskites such as BaTiO3 are subject to depolarization fields, and do not display ferroelectricity as in the bulk form. Therefore, the interface between the perovskite and …
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Managing tritium inventory and release with carbon materials in a fluoride salt-cooled high-temperature reactor
… generated by existing light water reactors. Adsorption technology is proposed, using chemically compatible carbon materials for the capture and control of tritium in the FHR. Various nanoporous activated carbon, graphene and nuclear graphite materials have been characterized. This includes …
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Silicon Piezoresistive Microcantilever For Potentiometric Sensing
… of the functionalization layers due to adsorption/desorption of target molecules. The amperometric chemical sensing devices have been shrunk down from micro to nano scale during last decades. In addition to conductance, it is very attractive to apply surface potential as a signature for …
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Design and characterization of colorimetric plasmonic nanostructures for imaging and sensing
… by detecting transmission peak shift upon the molecular adsorption or the dielectric property change on the surface. The surface modification of the plasmonic substrate using plasmonic metallic NPs is attempted in order to maximize the plasmonic sensitivity to the refractive index change …
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Phase diagram for the co-adsorption of O and OH on Pt(100) and Pt(111) as determined by DFT
The Langmuir adsorption isotherm is often used to model molecular adsorption on catalyst surfaces. The model assumes that adsorption occurs on a homogenous energy surface at specific localized sites with no lateral interactions between adsorbents. This simplification causes some concerns when …
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Modulation of Single-Walled Carbon Nanotube Fluorescence via Enzyme Reaction, Controlled Aggregation and Hydrogel Swelling Towards a Continuous Glucose Sensor
… one-dimensional nature renders them sensitive to molecular adsorption events. We explore methods to control the modulation of SWNT photoluminescence (PL) in response to glucose. We show that it is possible to assemble a glucose specific enzyme on the surface of nanotubes in solution while …
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Development and application of optical microscopy tools for the study of axon guidance
… based on the principle of light-induced molecular adsorption of proteins (LIMAP) were established to guide outgrowing RGC axons towards their physiological target tissue. In summary, this work describes the development of highly sophisticated tools designed to facilitate the study of axon …
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Microcantilever Based Potentiometric Sensors For Harsh Environment Applications
… an appropriate selective layer) to facilitate adsorption of targeted molecules which changes the resonant frequency or the static bending of the cantilever. However, cantilever coating suffers from non-uniformity, inability to tune the sensitivity and the problem of replacing the cantilever for …
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