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Dissertations / Theses on the topic 'Metal atom chemistry'

Author: Grafiati

Published: 4 June 2021

Last updated: 2 February 2022

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1

Tovey, R. C. "Studies in metal vapour synthesis." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375325.

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2

Ren, Wendong. "Photoinduced Atom Transfer Radical Polymerization." University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1619122320374689.

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3

Harris, Neil. "A matrix isolation study of main group and transition metal atom cryochemistry." Thesis, University of Hull, 2001. http://hydra.hull.ac.uk/resources/hull:12359.

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The majority of the work described in this thesis is concerned with the isolation of transition metal and main group atoms in dilute reactive ligand matrices. The previously uncharacterised matrix isolated species were characterised using IR, UV-Vis-NIR and XAFS spectroscopic techniques. Various metal atom sources were investigated for the production and subsequent isolation of atomic species in both inert and reactive ligand matrices. Some 4d and 5d transition metals atoms were produced from a hollow cathode sputtering source (laser ablation was also employed as an atom source in some of the

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4

Yassine, T. "The hot atom chemistry of some metal complexes and its application to radio isotope production." Thesis, University of Salford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381739.

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5

King, Evan. "Metal-Ligand Multiple Bonds in High-Spin Complexes." Thesis, Harvard University, 2012. http://dissertations.umi.com/gsas.harvard:10356.

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The chemistry of late first row transition metals supported by dipyrromethane and dipyrromethene ligands bearing sterically bulky substituents was explored. Transition metal complexes (Mn, Fe, Co, Ni, Zn) of the dipyrromethane ligand 1,9-dimesityl-5,5-dimethyldipyrromethane (dpma) were prepared. Structural and magnetic characterization (SQUID, EPR) of the bis-pyridine adducts \((dpma)Mn(py)_2\), \((dpma)Fe(py)_2\), and \((dpma)Co(py)_2\) showed each tetrahedral divalent ion to be high-spin, while square planar \((dpma)Ni^{II}(py)_2\) and tetrahedral \((dpma)Zn(py)_2\) were shown to be diamagne

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6

Dioses, Castro Silvio, and Richard Korswagen. "Over the possible role of metal atom clusters in cosmochemistry and in the origin of life." Revista de Química, 2013. http://repositorio.pucp.edu.pe/index/handle/123456789/100714.

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We present here the hypothesis of a possible relationship between metal atom clusters and the formation of organic molecules in the interstellar medium and on small bodies as a possible pathway to the origin of such molecules. Two distinct stages are díscussed: a) the possible formation and presence of atom clusters in space and on the primitive Earth, and b) the synthesis of interstellar and terrestrial prebiotic organic molecules, a process in which metalclusters could be the active catalysts. The confirmatíon of these suggestions might be very important in arder to explain the presence of e

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7

Ozcan, Gurbetoglu Pelin Gulistan. "Determination Of Cadmium Using Slotted Quartz Tube Atom Trap Atomic Absorption Spectrometry And Metal Coatings." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612212/index.pdf.

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ABSTRACT DETERMINATION OF CADMIUM USING SLOTTED QUARTZ TUBE ATOM TRAP ATOMIC ABSORPTION SPECTROMETRY AND METAL COATINGS &Ouml<br>zcan Gurbetoglu, G. Pelin M.S., Department of Chemistry Supervisor: Prof. Dr. O. Yavuz Ataman July 2010, 76 pages Flame atomic absorption spectroscopy (FAAS) is a common technique for detecting metals and metalloids in environmental, biological and metallurgical samples. Although it is a rather old technique, it is still very reliable, simple to use and inexpensive. The technique can be used to determine the concentration of over 70 different metals in a soluti

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8

Demirtas, Ilknur. "Lead Determination By Flame Atomic Absorption Spectrometry Using A Slotted Quartz Tube Atom Trap And Metal Coatings." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610794/index.pdf.

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Flame Atomic Absorption Spectrometry (FAAS) still keeps its importance despite the relatively low sensitivity<br>because it is a simple and economical technique for determination of metals. In recent years atom traps have been developed to increase the sensitivity of FAAS. Although the detection limit of FAAS is only at the level of mg/L, with the use of atom traps it can reach to ng/mL. Slotted quartz tube (SQT) is one of these atom traps, it is applied for determination of volatile elements<br>it is economical, commercially available and easy to use. In this study, a sensitive analytical met

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9

Osmanbasoglu, Mahmut. "Tellurium Determination By Flame Atomic Absorption Spectrometry Using A Slotted Quartz Tube Atom Trap And Metal Coatings." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613029/index.pdf.

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Flame Atomic Absorption Spectroscopy (FAAS) has lover sensitivity than similar analytical methods, however it has an important place for analysis due to its easy application and economic practicability especially in metal determinations. In order to increase the sensitivity of FAAS from mg/L level to ng/L level, various atom trap systems have been used. One of these atom traps, Slotted Quartz Tube (SQT), which is easy, economical and useful for volatile element determination, is used in this study as a sensitive analytical method for determination of tellurium. In the study, determination of T

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10

O'Hare, D. M. "Activation of carbon hydrogen bonds by metal atoms." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355789.

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11

English, Jason B. "Electronic structure investigations of multiple bonding between atoms: From metal-nitrogen triple bonds to metal-metal triple and quadruple bonds." Diss., The University of Arizona, 2002. http://hdl.handle.net/10150/280021.

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The nature of multiple bonding involving transition metal atoms has been explored via photoelectron spectroscopic and computational studies of molecules containing metal-metal quadruple and triple bonds as well as of molecules containing formal metal-nitrogen triple bonds. The principles governing the nature of the multiple bonding in these systems are similar whether the multiple bonding occurs between two transition metals or between a transition metal and a nitrogen atom. First, the electronic structures of the R₃M≡N molecules, where R = ᵗBuO (Cr, Mo, W); iPrO (Mo); (CH₃)₂CF₃CO (Mo); and Cl

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12

Loades, Stephen David. "Bonding to transition metal atoms in low oxidation states." Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333641.

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13

Williams, Christina Joyce. "An ESR study of metal atoms and organometallic compounds of biological interest." Thesis, Liverpool John Moores University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.484223.

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14

Subramaniam, Kavitha. "Metal uptake and its effects on colloidal particle interactions : equilibria and rates." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/20206.

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15

So, Eric. "Interaction of Rydberg hydrogen atoms with metal surfaces." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:53984973-1766-45cc-8bcf-055be714ed73.

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This thesis presents a theoretical and experimental investigation of the interaction of electronically excited Rydberg hydrogen atoms with metal surfaces and the associated charge-transfer process. As a Rydberg atom approaches a metal surface, the energies of the Rydberg states are perturbed by the surface potential generated by the image charges of the Rydberg electron and core. At small atom-surface separations, the Rydberg atom may be ionised by resonant charge transfer of the Rydberg electron to the continuum of delocalised unoccupied metal states, with which the Rydberg electron is degene

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16

Mulley, Suzanne M. "Physical studies of interstitial atoms in transition metal clusters by electron microscopy and N.M.R. spectroscopy." Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316607.

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17

Meng, Yao. "Hydrogen electrochemistry in room temperature ionic liquids." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:be24c6ea-c351-4855-ad9c-98e747ac87e4.

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This thesis primarily focuses on the electrochemical properties of the H<sub>2</sub>/H<sup>+</sup> redox couple, at various metallic electrodes in room temperature ionic liquids. Initially, a comprehensive overview of room temperature ionic liquids, RTILs, compared to conventional organic solvents is presented which identifies their favourable properties and applications, followed by a second chapter describing the basic theory of electrochemistry. A third chapter presents the general experimental reagents, instruments and measurements used in this thesis. The results presented in this thesis

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18

Rydén, Jens Olof Stefan. "Computational studies Of manganese-ligand clusters in the gas-phase and manganese atoms in graphene and metal-organic frameworks." Thesis, University of Sussex, 2011. http://sro.sussex.ac.uk/id/eprint/7400/.

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The work in this thesis deals with computational studies of manganese ions and atoms in the gas-phase and in the solid phase. The results are divided into three chapters, and the theory and methods used are explained and discussed in a separate theory chapter. The first results on manganese and its coordination to water and methanol molecules in the gas-phase are discussed in the light of physical properties for different ligands including water and methanol. Preferred coordination of a specific ligand type, preferred complex or cluster size as well as coordination modes are thoroughly investi

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19

Netzell, Elisabeth. "Using models and representations in learning and teaching about the atom : A systematic literature review." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-117163.

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This study is a systematic literature review on the role of models and representations in the teaching, learning and understanding of the atom and atomic concepts. The aim of the study is to investigate the role of different visual representations, what models and representations are used in the science classroom, how learners interpret different external representations of the atom, what mental models students construct, and how the representations can be used and designed for meaningful learning and teaching of the atom and atomic concepts. In this systematic literature review, a combinati

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20

Netzell, Elisabeth. "What models and representations do Swedish upper secondary school teachers use in their teaching about the atom?" Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-131625.

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This report presents the results from a survey study on Swedish upper secondary school physics andchemistry teachers’ use of models and representations in teaching the atom. The study builds upon an earlier systematic international literature review on the role of models and representations in the teaching, learning and understanding of the atom. The overall aim of the study is to explore what models and representations are used by Swedish upper secondary school physics and chemistry teachers in their teaching about the atom, what informs teachers’ selection of the atomic models and representa

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21

Awali, Slim. "Dynamique de relaxation électronique d’un atome métallique déposé sur agrégat d’argon." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112013/document.

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Ce travail de thèse est une recherche sur l'interaction entre des états atomiques excités électroniquement et un environnement non réactif. Nous avons étudié théoriquement et expérimentalement des situations où un atome métallique (K et Ba) est placé dans un environnement de taille finie (agrégat d’argon). La présence de l'environnement affecte les niveaux électroniques de l'atome. En retour, l'excitation de l'atome induit une dynamique de relaxation de l'énergie électronique via les déformations du système atome-agrégat. La partie expérimentale du travail porte sur les deux aspects : spectros

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22

Norberg, Daniel. "Quantum Chemical Studies of Radical Cation Rearrangement, Radical Carbonylation, and Homolytic Substitution Reactions." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8178.

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23

Estes, Deven Paul. "Transition Metal Hydrides that Mediate Catalytic Hydrogen Atom Transfers." Thesis, 2014. https://doi.org/10.7916/D8SF2TDQ.

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Radical cyclizations are important reactions in organic chemistry. However, they are seldom used industrially due to their reliance on neurotoxic trialkyltin hydride. Many substitutes for tin hydrides have been developed but none have provided a general solution to the problem. Transition metal hydrides with weak M-H bonds can generate carbon centered radicals by hydrogen atom transfer (HAT) to olefins. This metal to olefin hydrogen atom transfer (MOHAT) reaction has been postulated as the initial step in many hydrogenation and hydroformylation reactions. The Norton group has shown MOH

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24

Kuo, Jonathan Lan. "Using First Row Transition Metal Hydrides as Hydrogen Atom Donors." Thesis, 2017. https://doi.org/10.7916/D8MG8226.

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Radical cyclizations have become a mainstay of synthetic organic chemistry – useful for the construction of C–C bonds in laboratory-scale applications. However, they are seldom used the industrial scale. In large part, this is because of a reliance on Bu3SnH, widely regarded as the best synthetic equivalent to a hydrogen atom. Transition metal hydrides have emerged as promising alternative hydrogen atom sources. Over the last decade, the Norton group has studied three transition metal systems, with an emphasis on quantifying the M–H bond dissociation energies. Over time, the group has s

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25

Li, Gang. "Transition-Metal Complexes Catalyzed Hydrogen Atom Transfer: Kinetic Study and Applications to Radical Cyclizations." Thesis, 2015. https://doi.org/10.7916/D88S4P7C.

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Radical cyclizations have been proven to be extremely important in organic synthesis. However, their reliance on toxic trialkyltin hydrides has precluded their practical applications in pharmaceutical manufacturing. Many tin hydride substitutes have been suggested but none of them are adequate alternates to the traditional tin reagent. Transition-metal hydrides have been shown to catalyze the hydrogenation and hydroformylation of unsaturated carbon-carbon bonds. Theses reactions begin with a Hydrogen Atom Transfer (HAT) from a metal to an olefin, generating a carbon-centered radical. The

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26

Bhaskar, Srilakshmi P. "A Study on Digestive Ripening Mediated Size and Structure Control in Nanoparticles Prepared by Solvated Metal Atom Dispersion Method." Thesis, 2016. http://hdl.handle.net/2005/2924.

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Recent advancements in nanotechnology and emerging applications of nanomaterials in various fields have stimulated interest in fundamental scientific research dealing with the size and structure controlled synthesis of nanoparticles. The unique properties of nanoparticles are largely size dependent which could be tuned further by varying shape, structure, and surface properties, etc. The preparation of monodisperse nanoparticles is desirable for many applications due to better control over properties and higher performance compared to polydispersity nanoparticles. There are several methods for

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27

Jose, Deepa. "Synthesis, Characterization, and Reactivity Studies of Au, Ag, and Pd Colloids Prepared by the Solvated Metal Atom Dispersion (SMAD) Method." Thesis, 2009. http://etd.iisc.ernet.in/2005/3895.

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Surfactant bound stable colloids of Au, Ag, and Pd were prepared by the solvated Metal Atom Dispersion (SMAD) method, a method involving co-condensation of metal and solvent vapors on the walls of a reactor at 77 k. The as=prepared dodecanethiol-capped Au and Ag colloids consisting of polydisperse nanoparticles were transformed into colloids consisting of highly monodisperse nanoparticles by the digestive ripening process. In the case of Pd colloids, digestive ripening led to the formation of thiolate complexes. The [Pd(SC12H25)2]6 complex formed from the dodecanethiol-capped Pd nanoparticles

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28

Isa, Nabil Saba. "Atom scattering and reactions with self-assembled decanethiol monolayers /." 2003. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3097117.

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29

Martincigh, Bice Susan. "The influence of primary and secondary nitrogen donor atoms on the thermodynamics of complex formation in aqueous solution." Thesis, 1987. http://hdl.handle.net/10413/11368.

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30

CHIN, ROBERT C. "SPECTROSCOPIC STUDIES OF ALKALI METAL ATOMS ISOLATED IN LOW TEMPERATURE MATRICES; LASER-INDUCED FLUORESCENCE STUDIES OF BIOLOGICAL TISSUES." Thesis, 1987. http://hdl.handle.net/1911/16045.

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The interpretation of absorption spectra of metal atoms isolated in rare gas matrices has long been debated. In our studies we have observed the UV/Vis spectra of lithium/xenon and sodium/xenon matrices. A model is proposed to interpret our results. This model employs a BEBO explanation of the interactions of the metal atom in the rare gas crystal. By establishing the interaction potentials of the metal atom in the crystal, it is possible to calculate overlap integrals and thereby calculate an absorption envelope of Franck-Condon factor sticks. An analytical lineshape for the phonon vibrationa

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31

Chandrappa, G. T. "Studies on the complexes of transition metals with organic compounds containing Nitrogen, Sulphur and Oxygen atoms." Thesis, 1987. http://hdl.handle.net/2009/2623.

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32

SCHMIDT, HOWARD KHAN. "AUGER ELECTRON SPECTROSCOPY OF CRYOGENIC MATRIX ISOLATED METAL ATOMS AND DIRECT RECOIL SPECTROSCOPY (DRS), SIMS AND XPS STUDIES ON TITANIUM AND PIQ." Thesis, 1987. http://hdl.handle.net/1911/19059.

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Auger electron spectra of matrix-isolated metal atoms have been recorded for the first time. Differences in extra-atomic relaxation between bulk metal and argon matrix isolated atoms resulted in shifts in the energy of LMM Auger electrons, $-3.1$ eV for potassium and $-8.7$ eV for titanium. The sum of the shift and the known difference between the energies of LMM Auger electrons from gaseous and frozen argon is a good estimate of the total extra-atomic relaxation energy for the bulk metal after Auger processes. Polyimide Isoindolo Quinazolin-dione (PIQ) was studied in detail with Direct Recoil

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