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 81 for “"gold surface"”.
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A variable temperature scanning tunneling microscopy study of organizing C60 molecules on nanostructured gold surface
… molecular nanostructures on the Au (111) surface are studied under various conditions using variable temperature UHV STM. At room temperature, the C\(_{60}\)/Au interface exhibits rich features observed in the STM images, for instance the lifting of the reconstruction and the appearance of …
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High resolution imaging and lithography using interference of light and surface plasmon waves
… and lithography. In our lab, the standing wave surface plasmon resonance fluorescence (SW-SPRF) microscopy was developed. It is a combination of standing wave total internal reflection fluorescence (SW-TIRF), one of structured illumination techniques, with surface plasmon resonance (SPR). The …
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N-heterocyclic Carbene Synthesis Towards Self-Assembled Monolayers on Gold
Modifying surfaces with self assembled monolayers (SAMs) is a simple and effective way to create functional materials. Traditionally compounds containing a thiol head group are used to generate SAMs on gold surfaces. However, a recent discovery by the Crudden lab demonstrated increased bond …
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Electrochemical and spectroscopic analysis of collagen films and lipid bilayers on biomaterial surfaces
… model the native protein film on a biomaterial surface under the influence of electric fields. Collagen was chosen as the adsorbing protein and gold as the substrate material. Capacitance measurements, polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS), surface …
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Activity Studies of NI-AU And CO-AU Bimetallic Clusters on TIO2 (110)
… determine the mechanism of oxidation. On a pure gold surface, the O-H bond is broken, and the methoxy intermediate binds to the Au-titania interface. A C-H bond is broken and the resulting product is formaldehyde. The additions of nickel and cobalt to the gold surface were to determine any …
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Colloidal Gold as Molecular Capture Devices in Hybrid Nano/microfluidic Systems for Mass-Limited Sample Analysis
Analyte capture by the colloidal gold was demonstrated in a hybrid nano/microfluidic device designed for sequential fluid manipulations in three dimensions. A nanocapillary array membrane (NCAM) was utilized to enable efficient mixing of the gold colloid and the adsorbate in-device. Fluorescence …
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Gold nanorod surface functionalization: construction of dynamic surfaces and heterogeneous silica coating
Gold nanorods (GNRs) have been investigated due to their unique surface plasmon resonances (SPR) that are tunable in wavelength according to nanoparticle shape. The collective oscillation of the electrons in the GNRs excited by incoming light leads to enhanced electromagnetic fields near the gold …
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Control of Surface Chemistry of Gold, Pyrite and Pyrrhotite
… first the mechanism of xanthate adsorption on gold using Atomic Force Microscope (AFM), then the depression of pyrite and pyrrhotite using the synthetic polymers developed by Cytec Industries. The results show that for xanthate/gold system, dixanthogen is the only species that renders the …
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Peptide functionalisation and characterisation of gold (nano) surfaces
… and characterisation of peptide functionalised gold surfaces, with a focus towards developing enzyme response applications. The serine protease, elastase, was the primary focus of this work; however, all of the systems described herein have the utility to be modified for alternative proteolytic …
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MicroCantilever (MC) based nanomechanical sensor for detection of molecular interactions
… study are to investigate the mechanism governing surface stress generation associated with chemical or molecular binding on functionalized microcantilevers. Formation of affinity complexes on cantilever surfaces leads to charge redistribution, configurational change and steric hindrance between …
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Investigation of synthetic methods for preparation of 2<sup>o</sup>-amino derivatives of 5-amino- 1, 10-phenanthroline: Applications to Cu<sup>+2</sup> based impedance sensors
… for application as self-assembled monolayers on gold interdigitated electrode array chips in standard impedance and impedance resonance-based Cu<sup>2+</sup> sensors. Potential applications include monitoring Cu<sup>2+</sup> leaching from anti-fouling coatings on ship hulls. The importance of the …
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Developing Low Fouling Peptides and Zwitterionic Materials for Biomedical Applications
… designed from the examination of human protein surfaces found in nature. The peptide sequences glutamic acid/lysine (EK) and asparagine (N) were identified as displaying resistance to nonspecific protein adsorption. The low fouling sequence EK was further applied to several biomedical …
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Energy Transfer Dynamics in Collisions of Polar and Non-polar Gases with Functionalized Self-Assembled Monolayers
… terminated self-assembled monolayers (SAMs) on gold. Surface rigidity, internal degrees of freedom of the impinging gas, and potential energy surface well depths have been explored as a way to predict the outcome of a gas-surface collision. Ne is used to assess the mechanical rigidity of the …
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An Automated Measurement And Analysis System For Resistivity-Based Monitoring Of Chemical Self-Assembly On Thin Gold Films
… biochemical field for the functionalization of gold surface, surprisingly little is known about the surface structures of bound probes and the impact of the surface on hybridization reactions. It is interesting to note that, in spite of the tremendous potential held by these new DNA …
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On Quantum Reflection and The Casimir Effect : Application to atom-surface scattering
Quantum reflection of the light, neutral and surface sensitive 3He-atom is a novel method for investigating long-range attractive atom-surface potentials. This thesis presents the detailed analysis of experimental data obtained with the Atomic Beam Spin Echo (ABSE) spectrometer by scattering 3He …
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Electrochemical detection of interactions between DNA and various ligands
… diagnosis of these diseases. The impedance of a gold surface was measured in the presence and absence of single- and double-stranded DNA monolayers. The DNA monolayer was diluted with butanethiol in order to provide a surface with more accessible binding sites than an undiluted monolayer. The …
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Microfluidic Devices for Bioanalytical Applications
… the microcontact printed protein arrays on gold surface. A mechanism for image formation is proposed and protein absorptions on both gold and self assembly monolayer are characterized quantitatively. A physical patterning method based on PDMS called decal transfer lithography is applied to …
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Structural and kinetic studies of surfactant and phospholipid monolayers at the air/liquid interface using sum-frequency generation spectroscopy
… salt, self-assembled from solution onto a silica surface (which serves as a very approximate model of the hair surface). SFG was used to investigate and the effects of temperature and ionic strength on the conformational ordering of the adsorbed monolayer. The structure of a tethered bilayer lipid …
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Self-Assembled Monolayers of N-Heterocyclic Carbenes on Gold and Silver: Applications in Biosensing
Modification of metallic surfaces using thiol-based self-assembled monolayers (SAMs) has been explored in the literature in the past three decades; silver surfaces less explored than gold. This technology has promise in many surface-based applications, specifically in micro electronics, sensors …
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Application of impedance spectroscopy to the study of dithiocarbamate species on Au surfaces: Effects of aqueous Cu²⁺ and Mg²⁺ ions
… of dithiocarbamate ligands were formed on the Au surface of an interdigitated electrode (IDE) array by reaction of amines with CS<sub>2</sub> in H<sub>2</sub>O/CH<sub>3</sub>OH solutions. Impedance spectroscopy was used to probe for the presence of each SAM as they were individually applied to the …
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