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Showing 1 to 20 of 72 for “"ion mobility"”.
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Modeling ion mobility in solid-state polymer electrolytes
We introduce a course-grained model of ion diffusion in a solid-state polymer electrolyte. Among many tunable parameters, we investigate the effect of ion concentration, ion-polymer attraction, and polymer disorder on cation diffusion. For the conditions tested, we find that ion concentration has …
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Counter-flow Ion Mobility Analysis: Design, Instrumentation, and Characterization
The quest to achieve high resolution in ion mobility spectrometry (IMS) has continued to challenge scientist and engineers in the field of separation science. The low resolution presently attainable in IMS has continued to negatively impact its utility and acceptance. Until now, efforts to improve …
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Enhanced Electrospray Ionization for Mass Spectrometry and Ion Mobility Spectrometry
Electrospray ionization (ESI) has become one of the most commonly used ionization techniques for mass spectrometry (MS) and ion mobility spectrometry (IMS), and efforts continue to improve its performance. ESI-MS is most recognized for its wide application to biomacromolecules where high …
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Ion Mobility in Liquid Helium-3 Below 1 Degree K
Made available in DSpace on 2015-05-12T21:41:36Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6612361.PDF: 3217272 bytes, checksum: 8c40e94ef5b4f358c3977bfd9e7f2bbc (MD5) Previous issue date: 1966
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Ion mobility in liquid He[superscript 3] below 1°K
"The low field mobility of positive and negative ions in liquid He 3 was measured for temperatures between 0.03°K and 10K and pressures of 27.9 atm, 7.5 atm, and less than 0.35 atm. Ions in the liquid were produced by a radioactive tritiated titanium source and their mobility was obtained by …
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Utility of Ion Mobility – Mass Spectrometry in Peptidoglycan Structural Determination
… time commitment. Potential isomers, modifications, and cross-linking patterns within whole cell digests lead to complex samples that typically require manual analysis. The introduction of a method for streamlining the identification of peptidoglycan components (muropeptides) is needed to …
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The detection of hydrazine and related materials by ion mobility spectrometry.
A technique known as ion mobility spectrometry (IMS), which has been under development for about thirty years, has been shown to be capable of detecting hydrazines at low concentrations but with interference from ammonia. Ammonia is usually present in hydrazine environments, as a breakdown product …
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Investigations on the Use of Ion Mobility Spectrometry for Clinical Chemistry Applications
… major objective of this research is to examine ion mobility spectrometry as a rapid screening tool for specific application to clinical chemistry research and laboratory use. Methodology was developed for target analytes representing several classes of physiologically active substances, …
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The application of ion mobility mass spectrometry to molecules of pharmaceutical significance
Ion mobility-mass spectrometry experiments have been conducted to measure the drift-time and calculate collision cross-sections (CCSs) using travelling wave ion mobility spectrometry, and determine the CCS using drift-tube ion mobility spectrometry systems of analytes. The aim of the study was to …
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Drift Tube Ion Mobility Measurements for Thermochemistry, Kinetics and Polymerization of Cluster Ions
In this work, the Drift Tube Ion Mobility technique is used to study the hydrophobic hydration and solvation of organic ions and measure the thermochemistry and kinetics of ion-molecule reactions. Furthermore, an exploratory study of the intracluster polymerization of isoprene will be presented and …
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Method Transfer for Gas-Chromatography Ion Mobility Spectrometry from Laboratory to Industrial Instrumentation
European Union and United Kingdom regulations promoting the use of more environmentally friendly industrial processes, such as the use of aqueous formulation rather than organic matrices, has facilitated the development of problematic biocontamination events during manufacturing. The current gold …
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Applications of Ion Mobility Mass Spectrometry - Screening for SUMOylation and Other Post-Translational Modifications
<p>Post-translational modifications (PTMs) of proteins are fundamental processes that trigger, regulate and terminate most of the cellular mechanisms by covalent attachment of chemical moieties to substrate proteins. Conjugation to the Small Ubiquitin-like MOdifier (SUMO) is a highly conserved and …
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Ion Mobility Spectrometry : Optimization of Parameters in Collision Cross Sections and Trace Detection of Explosives
Ion mobility spectrometry is a powerful technique for the study related to molecule. The work of tow major applications are introduced in this paper. The first application is the optimization of parameters in CCS. The accurate calculation of the collision cross section for multiple molecules is a …
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Ion mobility and mass spectrometric investigations of organophosphates related to chemical warfare agents and pesticides
A commercial Ion Mobility Spectrometer that is designed to detect Chemical Warfare Agents (CWAs), is modified by the addition of a second ion gate, and connected to a commercial Ion Trap Mass Spectrometer (ITMS). The addition of the second gate allows selection of individual ion mobility peaks for …
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Development of ion mobility mass spectrometry deconvolution strategies for use in data-independent acquisition proteomics.
… tools for high-throughput protein characterization. However, limitations in ion mobility (IM) and mass spectrometry (MS) resolving powers can limit the success of MS-based proteomics approaches. This work highlights the development of IM-MS deconvolution techniques and their utilization with …
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Comparing Solution-Phase and Gas-Phase Protein Stability Using Ion Mobility and Differential Mobility Mass Spectrometry
… studies with mass spectrometry through collision induced unfolding (CIU) whereby the ion temperature in the trap collision cell is increased and unfolding changes are tracked in the ion mobility cell. However, whether a protein retains its structural properties in the gas phase has been a …
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Gas Phase Studies of Molecular Clusters Containing Metal Cations, and the Ion Mobility of Styrene Oligomers
… the mechanism of the self-initiated polymerization (or thermal polymerization) of styrene in the gas phase. In this work, we present the first direct evidence for the thermally self-initiated polymerization of styrene in the gas phase. Our approach is based on on-line analysis of the gas phase …
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