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 54 for “"TOF-SIMS"”.
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TOF-SIMS analyses of interplanetary dust particles
… die Sekundärionen-Flugzeitmassenspektrometrie (TOF-SIMS). Diese ermöglicht die nahezu zerstörungsfreie Elementanalyse von Teilchenoberflächen und -schnitten bei hoher lateraler Auflösung. Obwohl TOF-SIMS eigentlich flache Proben voraussetzt, konnte diese Technik mit Hilfe von Modellrechnungen …
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Application of imaging TOF-SIMS in cell and tissue research
This thesis is aimed at extending the use of TOF-SIMS (time of flight secondary ion mass spectrometry) as an analytical tool in cell and tissue research. TOF-SIMS is a relatively new method that allows analysis of the chemical composition of sample surfaces. Originally, it was used for imaging the …
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Identification and imaging different lipid species within phase-separated model membranes by integration of TOF-SIMS and principal component analysis
Time of flight secondary ion mass spectrometry (TOF-SIMS) enables chemically imaging the distributions of various lipid species in model membranes. However, discriminating the TOF-SIMS spectra of structurally similar lipids is very difficult because the low mass fragment ions that are abundant in …
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Applying secondary ion mass spectrometry to cellular and model membranes to image component distribution and quantify composition
Abstract Secondary ion mass spectrometry (SIMS) returns chemically specific data on membrane component distribution and composition. Of particular interest is a membrane protein’s lipid environment, which may play a role in the protein’s function. Herein, this thesis describes the synthesis of …
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Secondary ion mass spectrometry as a tool to evaluate chemical composition within model and cellular membranes
… cell processes. Secondary ion mass spectrometry (SIMS) is a technique that offers both chemical and spatial specificity, and has become popularized over the last decade for analyzing model and native cellular membranes. Herein, this thesis describes the use and development of SIMS for such …
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The Use of Secondary Ion Mass Spectrometry to Advance Integrated Process Technology for 2D Materials
… industry, secondary ion mass spectrometry (SIMS), at different stages along the path of optimizing the fabrication process to maximize the quality of 2D materials for their scalable integration in the next future technologies. Specifically, time of flight secondary ion mass spectrometry …
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Time-of-Flight Secondary Ion Mass Spectrometry Analysis of Microbial Induced Corrosion of Glasses
… Time-of-flight secondary ion mass spectrometry (ToF–SIMS) – a powerful mass spectral imaging technique with high surface sensitivity, mass resolution, and mass accuracy – is used to study biofilm effects on different substrates. The first study examined the stress response of a biofilm to low …
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The utilization of boron-rich clusters as aids to detect reactive oxygen and nitrogen species through non-fluorescent modalities
… such as time-of-flight mass spectrometry (ToF-SIMS) or Raman spectroscopy. Utilizing these non-fluorescent scaffolds, we hope to expand the toolbox ROS/RNS targeting scaffolds to further understand their behavior within biological systems. ☐ In Chapter 1, I will discuss progress made …
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Small molecule profiling and imaging of the zebra finch song system
… of Flight - Secondary Ion Mass Spectrometry (ToF-SIMS) small molecules (e.g. fatty acids) are detected and high spatial resolution images (2.3 μm) are generated, forming 11.5 megapixel chemical images using a sagittal brain section collected from an adult male zebra finch. ToF-SIMS analysis …
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An investigation into the role of DTP as a co-collector in the flotation of a South African PGM ore
… using a combination of batch flotation and ToF-SIMS experimental techniques, whether a collector-collector synergistic interaction between SIBX and diethyl DTP will result in significantly enhanced copper, nickel, platinum and/or palladium recoveries and grades in a PGM containing ore from …
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Characterization, Functionalization and Applications of Alkyl Monolayers on Silicon Surfaces
… time-of-flight secondary ion mass spectrometry (ToF-SIMS) images of LAMS spots were also reported. X-ray photoelectron spectroscopy (XPS) and other data show that alkyl monolayers prepared by scribing silicon under 1-iodoalkanes and 1-alkenes were stable over extended periods of time to air, …
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The role of complexing agents in the flotation of pentlandite-pyroxene mixtures
… 9. Microflotation, zeta potential measurements, ToF-SIMS analyses (time of flight secondary ion mass spectrometry) and X-ray photoelectron spectroscopy (XPS) were used as tools in determining the extent of surface alteration.
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Mass spectrometry methods for imaging cellular lipids, organelles, and proteins
… time-of-flight secondary ion mass spectrometry (TOF-SIMS) can ionize lipids and other large biomolecules without fragmentation, so these approaches can be applied to unlabeled samples. In contrast, ionization sources that extensively fragment biomolecules into mono- and di-atomic secondary ions, …
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Analysis of Endogenous Particles in Exhaled Air
… time-of-flight secondary ion mass spectrometry (TOF-SIMS), which is a very sensitive technique for surface analysis. This method was also used to compare the composition of particles in exhaled air from subjects with asthma to that in healthy controls. Second, a method for the quantitative …
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CORROSION PROTECTION OF COPPER IN OILY MEDIA: MICROSCOPIC MECHANISMS
… analogous to automotive lubricants.XPS and ToF-SIMS characterization were carried out on TTAH adsorption films formed on pristine Cu surfaces immersed in 0.01 wt. % TTAH oil solution at room temperature for immersion times ranging from 1 s to 0.6 Ms. Instantaneous complete coverage of the Cu …
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Gold Nanomaterial–Biomolecule Interactions: Influence of Size, Gold Nanomaterial–Biomolecule Interactions: Influence of Size, Surface Chemistry, and Environment Surface Chemistry, and Environment
… time-of-flight secondary ion mass spectrometry (ToF-SIMS) was employed to explain size/ligand- dependent L-cysteine (Cys) adsorption on AuNPs. Cyclic voltammetry was also employed to investigate their electrochemical reactivity. Both techniques revealed enhanced interaction with Cys for smaller …
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Mechanochemical activation at solid interfaces
… Time of Flight Secondary Ion Mass Spectroscopy (ToF-SIMS), confirmed that mechanochemical activation occurring only in active specimens above the threshold activation stress between 149 MPa and 163 MPa. Analysis of the resulting fluorescence showed an ‘on-off’ activation, not observed in bulk …
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Design of Polymer Composites With Improved Adhesion and Wear Properties
… compared to a commercial PTFE based coating. TOF-SIMS analysis showed that ZonylRTM particles had migrated down into the coating at least 1.5 microm deep when the wear track was only 0.2 microm deep, which means that a ATSP and Zonyl RTM composite had formed due to pressure and sliding. It is …
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Pentlandite-pyroxene and pentlandite-feldspar interactions and their effect on separation by flotation
… potential determinations, microflotation and ToF-SIMS (time of flight secondary ion mass spectrometry) analyses and in synthetic process water in the case of batch flotation tests.
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Identification of esters in carious dentine Staining and chemo-mechanical excavation
… Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS). The second and third studies focused on the possible formation of covalent bonds between carious dentine and 15N2-hydrazine, 15N2-labelled Lucifer yellow, and stains carrying a hydrazine derivative respectively, using ToF-SIMS, …
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