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Dissertations / Theses on the topic 'Ion chemistry and composition'

Author: Grafiati

Published: 10 March 2023

Last updated: 31 July 2025

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1

Wronska, Louisa Victoria May. "The factors & protocols that influence accuracy, precision & uncertainty of accurate mass measurements by Fourier transform ion cyclotron resonance mass spectrometry to validate the assignment of elemental composition." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/67059/.

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The need for very accurate mass measurements of compounds is becoming more demanding with the expansion of the number of compounds in need of correct identification and with the limits of elemental analysis; a fast, robust analytical solution is sought. Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) is a very powerful tool for undertaking accurate mass measurements because of its high resolving power and mass accuracy. The use of FT-ICR MS in a high-throughput environment is limited due to the need of operator intervention required to obtain optimum accurate mass measu

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2

Martin, Riana Theresa. "Evaluation of capillary electrophoresis as an analytical technique using bulk ionic composition of fluid inclusions in quartz." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51751.

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Thesis (MSc)--Stellenbosch University, 2000.<br>ENGLISH ABSTRACT: This study was initialized to introduce capillary electrophoresis (CE) as a useful technique in the analysis of fluid inclusions in quartz. lts advantages are low detection limits for the dissolved ionic content of the fluid, the small amount of sample (1 g or less) for a detailed qualitative and quantitative analysis, and the short time required to obtain results (one run for either cations or anions take approximately 10 minutes). The study area from which quartz veins were selected is situated within the Neoproterozoic

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3

Toida, Mieko, Hiroyuki Higashino, and Yukiharu Ohsawa. "Effect of ion composition on ion acceleration by magnetosonic shock waves." American Institite of Physics, 2008. http://hdl.handle.net/2237/12029.

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4

Isildak, Ibrahim. "Ion selective electrodes in ion chromatography." Thesis, University of Newcastle Upon Tyne, 1992. http://hdl.handle.net/10443/859.

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The number of applications of potentiometric detection In Ion chromatography Is Increasing In the use of ion selective electrodes for which the response Is not limited to a few number of Ions. In this research, membrane electrodes, for a number of Ions, based on PVC were prepared to examine selectivity, detection limit and reproducibility for chromatographic and flow-injection measurements via mixed solution method and flow-injection technique. The selectivity sequence of anion selective electrodes for single charged Inorganic anions was F< Cl < Br < NO 2< NO 3<I. This was Ll +< Nil+< Cs+< Na+

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5

Bissonnette, Martine C. "Ion/radical and ion/molecule complexes and ion structure assignments in the gas phase." Thesis, University of Ottawa (Canada), 1991. http://hdl.handle.net/10393/7731.

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The fragmentation mechanism of ionized neopentanol, (CH$\sb3$)$\sb3$CCH$\sb2$OH$\sp{+-}$, has been studied in great detail along with other C$\sb5$H$\sb $H$\sp{+-}$ isomers. The use of $\sp $C and D labelling was found an essential tool to establish the relation between the other species involved in the dissociation of neopentanol. The involvement of (CH$\sb3$)$\sb2$C$\sp{\cdot}$CH$\sb2\sp+$(O)HCH$\sb3$, (CH$\sb3$)$\sb3$C$\sp+$(O)HCH$\sb2$ and (CH$\sb3$)$\sb2$($\sp\cdot$CH$\sb2$)CCH$\sb2\sp+$OH$\sb2$ was essential to explain the H/D label exchange occurring upon fragmentation of neopentyl alco

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6

Marto, Jarrod A. "External Ion Injection and Applications of Ion Axialization in Fourier Transform Ion Cyclotron Resonance Mass Spectrometry /." The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487868114113087.

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7

Diédhiou, Malick. "Ion Chemistry of Hydrogenated PAHs." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40452.

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Polycyclic aromatic hydrocarbons (PAHs) are a class of organic molecules suggested to constitute roughly 20% of carbon in the interstellar medium (ISM). These species exist in both neutral and ionic forms and both are potentially involved in processes such as H2 formation. Catalyzing H2 formation necessarily involves the participation of hydrogenated PAHs as reaction intermediates. Employing tandem mass spectrometry and imaging photoelectron photoion coincidence spectroscopy and theory, we have explored the unimolecular reactions of five ionized hydrogenated PAHs that vary in degree and positi

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8

Hall, Adrian Mark. "Composition and morphology of substorm-associated ion injections." Thesis, University of Leicester, 1997. http://hdl.handle.net/2381/30662.

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This thesis describes an investigation into the composition and morphology of substorm ion injections at magnetic latitudes and L-shells away from geostationary orbit. Furthermore, the work investigates the Dst-dependent conditions that affect these compositional and spatial characteristics. Count rate and composition measurements in the energy range 80 - 400 keV/q form the basis of the analysis. Near-equatorial observations by the CRRES spacecraft during 1991 have been used to study substorm and near-Earth magnetosphere composition, injection event distribution, and the injection region morph

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9

Pollum, Laura L. "Digital ion trap mass spectrometry for cold ion-molecule chemistry." Thesis, University of Oxford, 2015. http://ora.ox.ac.uk/objects/uuid:18c6451d-d247-4384-9257-f8864e038343.

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A promising new approach for studying cold ion-molecule chemical reactions is the combination of laser- or sympathetically-cooled trapped ions and slow-moving molecules from a cold molecule source, such as a quadrupole velocity selector or a Stark decelerator. Previous reaction studies using trapped atomic ions and slow molecules from a quadrupole velocity selector were able to reach average collision energies as low as 1 K. However, the guided molecules had an approximately room temperature rotational energy distribution, so the reactions studied were not truly cold. Thus, a new molecular sou

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10

Murrell, Jason. "Some studies in ion/molecule reactions on ion trapping instruments." Thesis, University of Kent, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319223.

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11

Pearson, C. H. G. "New ion exchange resins for ion chromatography applied to anions." Thesis, University of Kent, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372771.

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12

Maxwell, Virginia Margaret. "Ion-selective electrodes." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329972.

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13

Ross, Charles William. "Gas phase ion - molecule reactions studied by Fourier transform ion cyclotron resonance mass spectrometry /." The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487846885778077.

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14

Yin, Winnie Weixin. "Fourier transform ion cyclotron resonance mass spectrometric study of gas-phase ion-molecule reactions /." The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487847309051562.

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15

Gill, Matthew Clive. "The ion conveyor : an ion focussing and conveying device for mass spectrometry." Thesis, University of Warwick, 2010. http://wrap.warwick.ac.uk/3715/.

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The advent of electrospray ionisation (ESI) has been a major factor driving the revolution which has taken place in the field of biological mass spectrometry over the past twenty years. In this thesis, efforts to improve electrospray ionisation in two respects are detailed. One is the transmission of ions from ambient pressure into the high vacuum of a mass spectrometer. The other is control and influence over making and breaking of bonds, in particular long and weak bonds, during this journey into the mass spectrometer. These improvements to electrospray ionisation have been sought through th

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16

Wang, Mingda. "New and improved ion traps for high resolution Fourier transform ion cyclotron resonance mass spectrometry /." The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487681788254101.

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17

Chen, Ruidan. "Theory and practice of ion trap design in fourier transform ion cyclotron resonance mass spectrometry /." The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487847309053468.

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18

Parri, Lorenzo. "Ion current and exhaust gas composition measurements for combustion monitoring." Doctoral thesis, Università di Siena, 2021. http://hdl.handle.net/11365/1143828.

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The efficiency of combustion processes is assuming nowadays a huge importance, since the energy production, many industrial processes, as well as building heating systems are still mainly based on the combustion of hydrocarbons. The performance of the combustion process depends on many factors and it is a crucial point for the reliability and the efficiency of a plant or a thermal machine that exploits combustion as a primary source of energy. Moreover, the constant increasing of carbon dioxide concentration in atmosphere makes more and more important reducing the emission of this gas as well

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19

Hannon, Michael John. "Metal ion control in oligopyridine coordination chemistry." Thesis, University of Cambridge, 1993. https://www.repository.cam.ac.uk/handle/1810/272558.

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20

McKillop, Andrew G. "Ion mobilities in capillary electrophoresis." Thesis, Loughborough University, 1996. https://dspace.lboro.ac.uk/2134/28235.

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The project has investigated the electrophoretic mobilities of sets of model compounds to determine the effects of size and shape on ion mobilities. Methods were developed for the analysis of compounds in order to quote accurate electrophoretic mobilities. Using the obtained electrophoretic mobilities mobility orders were correlated with structural properties.

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21

Ruiz-Diaz, J. E. "Fast ion transport in solids." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355773.

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22

Bates, Paul Stephen. "Enantiomer discrimination and ion receptors." Thesis, Durham University, 1993. http://etheses.dur.ac.uk/5689/.

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Highly lipophilic α-, β- and γ- cyclodextrin derivatives were prepared in order to obtain enantiomer selective ionophores for β-aryl ammonium ions and selective ionophores for tetrahedral ammonium ions. The extent of cyclodextrin functionalisation and the homogeneity of the products was investigated by chemical depolymerisation, (^1)H and (^13)C NMR and (+)-FAB-, FD- and ES- mass spectral analysis. For each cyclodextrin, the products of alkylation were found to consist of several constitutional isomers and homologues. These highly lipophilic molecules were incorporated into solvent polymeric m

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23

Ichsan, E. A. W. "Ion exchange on chelating fibres." Thesis, University of Salford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353980.

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24

Xu, Chao. "All silicon lithium-ion batteries." Licentiate thesis, Uppsala universitet, Strukturkemi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-261626.

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Lithium-ion batteries have been widely used as power supplies for portable electronic devices due to their higher gravimetric and volumetric energy densities compared to other electrochemical energy storage technologies, such as lead-acid, Ni-Cd and Ni-MH batteries. Developing a novel battery chemistry, ‘‘all silicon lithium-ion batteries’’, using lithium iron silicate as the cathode and silicon as the anode, is the primary aim of this Ph.D project. This licentiate thesis is focused on improving the performance of the silicon anode via optimization of electrolyte composition and electrode form

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25

Shi, Yu. "Single-ion Hydration and Ion Association in Aqueous Solutions." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439310243.

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26

Park, Sarah Sunah. "Electron- and ion-conducting metal-organic frameworks." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/113983.

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Thesis: Ph. D. in Inorganic Chemistry, Massachusetts Institute of Technology, Department of Chemistry, 2017.<br>Cataloged from PDF version of thesis. Vita.<br>Includes bibliographical references (pages 129-136).<br>This thesis focused on designing, characterizing and understanding the electronic or ionic behavior of electron- or ion-conducting metal-organic frameworks (MOFs). Chapter 1 gives a general introduction for electron- or ion-conducting MOFs, including a review of the reported materials exhibiting such behavior. Chapter 2 describes new MOFs designed using through-space charge transpor

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27

You, Xingzhi. "An Advanced High Efficiency Non-Radiogenic Ion Source for Ion Mobility Spectrometry." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/293471.

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During the last decade, the Denton Research Group has made significant advancements in the field of real time direct vapor detection of low volatile explosives under ambient conditions. An ion source plays a crucial role in the sensitive detection of traces of compounds in gas phase by ion mobility spectrometry, but, all the current ionization techniques have significant drawbacks and do not fully satisfy all needs. To overcome the limitations associated with either hazards from a radiogenic ion source or poor reliability from the current non-radiogenic ion sources, the author of this disserta

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28

Radioti, Aikaterini. "Energetic ion composition and acceleration mechanisms in the magnetosphere of Jupiter." Katlenburg-Lindau Copernicus GmbH, 2006. http://www.digibib.tu-bs.de/?docid=00011594.

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29

Buxton, Samuel. "Parasitic nematode ion channels : improving understanding of pharmacology and genetic composition." Thesis, Tours, 2012. http://www.theses.fr/2012TOUR4047/document.

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Actuellement, les infections des humains, des plantes et des animaux par les nématodes parasites ont un impact économique majeur. En l’absence de vaccin efficace, les anthelminthiques sont les principaux agents chimiothérapeutiques utilisés pour le traitement et la prophylaxie des infections à nématodes. Cependant, la résistance est apparue pour la plupart des anthelminthiques. Par conséquent il est urgent de comprendre la génétique des récepteurs ciblés par ces anthelminthiques et de trouver des cibles alternatives afin de développer de nouveaux anthelminthiques. Nous avons démontré les effet

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30

Zankov, Ivan. "Optimization of Cubesat-Compatible Plasma Ion Analyzer for Asteroid Composition Analysis." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76290.

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Many space probes have conducted in situ explorations of asteroids, in recent decades, intent on identifying evidence of the solar system's earliest processes of formation within the asteroids' interiors. Several future asteroid missions are planned, among which include ESA's Hera mission to explore the Didymos binary asteroid pair. An ion mass analyzer is currently being designed at the Swedish Institute of Space Physics for use as part of the Hera mission. This thesis aims to optimize the instrument such that each of its parameters meets the requirement for performance. A computer simulation

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31

Swallow, Isabella Diane. "Probes for bacterial ion channels." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:d42d13dd-dd0c-451b-bd00-e06f84350335.

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Using three complementary approaches, this work sought to tackle the widespread problem of antibiotic resistance. To circumvent the resistance mechanisms developed by bacteria, it is necessary to establish drug candidates that act on novel therapeutic targets, such as the ion channels used by bacteria to modulate homeostasis. Examples include the potassium efflux channel, Kef, and the mechanosensitive channel of small conductance, MscS, which are not found in humans. How these targets function must be well understood before drug candidates can be developed, as such, their identification and in

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32

Knipe, Peter Clarke. "Chiral counter-ion controlled asymmetric electrocyclic reactions." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:c981f724-c783-4913-b224-92fcebf94d37.

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The aim of this project was to develop new catalytic methods to control asymmetry in electrocyclic reactions, and to apply these methods to generate complex molecules. Initial efforts were directed towards the catalysis of anionic 8π electrocyclizations (Chapter 2 and Figure i). 8π electrocyclization was not achieved due to issues with alkene geometry and anion stability. Our efforts were then directed towards using phase-transfer catalysis to generate complex polycyclic compounds via a cascade electrocyclization-1,4-addition (Chapter 3 and Figure ii). Pyrrolidines and indolizidines were gener

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33

Kullman, Michael John. "Computional chemistry studies of gas-phase ion structures." Thesis, Wichita State University, 2012. http://hdl.handle.net/10057/5412.

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Computational chemistry and mass spectrometry are two extremely useful tools that when used in conjunction with each other allow detailed knowledge of the gas-phase ions. To that end, computational chemistry, specifically density functional theory is used for theoretical to experimental frequency comparisons. This allows for insight into the reaction pathways and likely structures to be explored in detail.<br>Thesis (M.S.)--Wichita State University, College of Liberal Arts and Sciences, Dept. of Chemistry

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34

Boldi, Robert A. (Robert Arthur). "A model of ion chemistry of electrified convection." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/51502.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1992.<br>Includes bibliographical references (leaves 175-182) and index.<br>by Robert A. Boldi.<br>Ph.D.

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35

Dick, Janice. "Analytical applications of ion selective devices." Thesis, University of Newcastle Upon Tyne, 1991. http://hdl.handle.net/10443/834.

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Ion selective electrodes, ISEs, and ion sensitive field effect transistors, ISFETs, are small, relatively simple to operate and easily automated sensors and, therefore, have a wide range of uses e. g. for field measurements in portable detectors, for on-line measurements in industrial flow systems and in clinical work. Several flow systems were studied for use with ion selective devices. New design ISE flow cells, designed at Newcastle, were found to minimise dead space and carry-over of sample solutions, allowing more rapid sample throughput. An ISFET flow cell studied, however, was found to

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36

Byrne, Declan J. "Novel calixarene receptors for ion complexation." Thesis, Queen's University Belfast, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287294.

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37

O'Neill, Karen Elizabeth. "Studies in ion trap mass spectrometry." Thesis, University of East Anglia, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332326.

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38

Grey, H. "Ion-selective electrodes using biomimetic ligands." Thesis, University of Newcastle Upon Tyne, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372565.

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39

Johnson, Brian W. "Ion transport through protective polymer coatings." Thesis, University of Newcastle Upon Tyne, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293683.

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40

Zhang, Mengqi. "Thermodynamically Driven Ion Exchange between MS (M= Fe Zn) and the Cu2+ Ion: Towards a Safe Oral Copper Detoxifying Drug." Kent State University Honors College / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ksuhonors1400279302.

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41

Parker, Mariah L. "The Investigation of Oxidative Addition Reactions of Metal Complexes in Cross-Coupling Catalytic Cycles Based on a Unique Methodology of Coupled Ion/Ion-Ion/Molecule Reactions." VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5651.

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Popular catalytic cycles, such as the Heck, Suzuki, and Negishi, utilize metal centers that oscillate between two oxidation states (II/0) during the three main steps of catalysis: reductive elimination, oxidative addition, and transmetallation. There has been a push to use less toxic, cheaper metal centers in catalytic cycles, leading to interest in first-row transition metals, such as nickel and cobalt. With these metals, the cycles can potentially pass through the +1 oxidation state, which acts as reactive intermediates, undergoing oxidative additions to form products, potentially with radic

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42

Cool, Lydia R. "Identifying and Distinguishing Isomers Using Mass Spectrometry and Ion Mobility." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1460470683.

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43

Chen, Songela Wenqian. "Modeling ion mobility in solid-state polymer electrolytes." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122534.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Chemistry, 2019<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 31-32).<br>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 little effect on diffusion. Polymer disorder creates local variation in behavior, which we call "trapping" (low diffusion

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44

Wade, David Christopher. "Investigating palaeoatmospheric composition-climate interactions." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/282998.

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The composition of the atmosphere has changed substantially over Earth's history, with important implications for past climate. A number of case studies will be presented which employ coupled climate model simulations to assess the strength of these chemical feedbacks on the climate. The eruption of Mount Samalas in 1257 led to the largest stratospheric volcanic injection of aerosol precursor gases in the Common Era, however climate model simulations of the last millennium typically overestimate the resulting climatic cooling when compared with tree-ring proxy records. A novel configuration of

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45

Du, Chen. "Architectural Characterization of Polyhedral Oligomeric Silsesquioxanes by Ion Mobility Mass Spectrometry." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1525355186538632.

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46

Bright, Vivien Bianca. "Street canyon atmospheric composition : coupling dynamics and chemistry." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4414/.

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A new model for the simulation of street canyon atmospheric chemical processing has been developed, by integrating an existing Large-Eddy Simulation (LES) dynamical model of canyon atmospheric motion with a detailed chemical reaction mechanism, the Reduced Chemical Scheme (RCS), comprising 51 chemical species and 136 reactions, based upon a subset of the Master Chemical Mechanism (MCM). The combined LES-RCS model is used to investigate both the effects of mixing and chemical processing upon air quality within an idealised street canyon. The effect of the combination of dynamical (segregation)

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47

Van, Orden Steven Lee. "Mechanistic investigations of gas phase ion-molecule reactions using Fourier transform ion cyclotron resonance mass spectrometry." Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/186137.

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Studies of the mechanisms and energetics of a variety ion-molecule reactions involving organometallic and organic ions, have been performed using Fourier transform ion cyclotron resonance mass spectrometry (FTMS). The bond activation processes of V⁺, VO⁺, VOH⁺, and VOCH₃⁺ with water and methanol were investigated in detail. All ions are observed to preferentially activate the C-O bond in methanol, however C-H and O-H bond cleavage are also observed. The addition of the oxo, hydroxo, and methoxo ligands is found to significantly effect the intrinsic reactivity of the ions, relative to V⁺. The r

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48

Carey, Kieran A. "New chemistry of bis-trityl dications." Thesis, University of Newcastle Upon Tyne, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311995.

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49

Myung, Sunnie. "Developing ion mobility methods for studying structure and assembly of biomolecules." [Bloomington, Ind.] : Indiana University, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3238509.

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Thesis (Ph. D.)--Indiana University, Dept. of Chemistry, 2006.<br>"Title from dissertation home page (viewed July 16, 2007)." Source: Dissertation Abstracts International, Volume: 67-10, Section: B, page: 5718. Adviser: David E. Clemmer.

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50

Willemse, Abraham Cilliers. "Electrospinning bicomponent nanofibres for platinum ion extraction from acidic solutions." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80028.

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Thesis (MSc)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: Trace amounts of soluble Pt(II/IV) ions are not recovered using current refining processes. There are both economic and environmental incentives to recover these Pt(II/IV) ions from effluent. The work presented in this dissertation was aimed at producing functionalised electrospun nanofibre webs for the extraction of trace amounts of Pt(II/IV) ions in the form of [PtCl6]2- from acidic solutions. An insoluble, low molecular weight oligomeric compound, poly(N-terephthaloylthiourea)-N’,N’-piperazine, was synthesised from relativel

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