Tesi sul tema "Ions lanthanides"
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Farkas, Ildiko. "Coordination Chemistry of Actinide and Lanthanide Ions". Doctoral thesis, KTH, Chemistry, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3236.
Mehdoui, Thouraya. "Etude des facteurs favorisant la complexation sélective des ions lanthanides et actinides trivalents". Paris 11, 2005. http://www.theses.fr/2005PA112144.
In order to obtain clear-cut information on the factors which favour the discrimination between trivalent actinides and lanthanides, we investigated the complexation of the tris(cyclopentadienyl) Ce(III) and U(III) compounds, (RCp)3M (R = tBu, SiMe3), with a series of monocyclic azines with distinct Lewis basicity and reduction potential. Coordination of pyrazine and 4,4' and 2,2'-bipyridines on the (RCp)3M complexes has also been studied. Of major interest is the reversible oxidation of the (RCp)3U species into the uranium(IV) [(RCp)3U]2(pyz) complexes by pyrazine. The presence of cooperativity in the binding of the cyclopentadienyl groups by U(III), due to late appearance of back-bonding, leads to a greater stabilization of the uranium(III) complexes. Complexation of the species Cp*2MI (M = Ce, U) by 2,2'-bipyridine, phenanthroline and terpyridine affords the adducts [Cp*2M(L)]I. For L = bipy and terpy, these compounds are reduced into Cp*2M(L). The magnetic data for [Cp*2M(terpy)]I and Cp*2M(terpy) are consistent with Ce(III) and U(III) species, with the formulation Cp*2MIII(terpy•–). An electron transfer reaction between these species was observed in NMR. Reactions of the [Cp*2M(terpy)]I and Cp*2M(terpy) complexes with H• and H+ donor reagents lead to a clear differentiation of these trivalent ions. We studied the coordination of the stable N-heterocyclic carbene and isonitrile molecules on (RCp)3M and Cp*2MI ; competition reactions and comparison of the crystal structures of the carbene compounds reveal the much better affinity of the NHC and tBuNC ligands for the 5f rather than for the 4f ion
Bretonnière, Yann. "Chimie de coordination des ions lanthanides(III) avec des ligands tripodes azotés et oxygénés". Université Joseph Fourier (Grenoble ; 1971-2015), 2001. http://www.theses.fr/2001GRE10100.
Turcry, Véronique. "Les poly-tétraazamacrocycles : Synthèse via un intermédiaire bis-aminal - Complexation d'ions de métaux de transition et de lanthanides". Brest, 2004. http://www.theses.fr/2004BRES2038.
This work is divided into two parts : The first part is dedicated to synthesis of symmetrical or unsymmetrical bis tetraazamacrocyclic compounds, via bis aminal derivatives of cyclam and cyclen. This method is extended to linear and cyclic tris macrocyclic compounds. In the second part, we report the complexation of these poly tetraazamacrocycles with transition metal ions : Cu(II) and Ni(II). The complexes have been fully investigated by cyclic voltammetry and EPR to determine possible interactions between the metal centres. Carboxylic pendant arms have been grafted on some bis tetraazamacrocycles to coordinate Gd (III). Resulting complexes present better properties that DOTA Gd(III) as nuclear magnetic resonance imaging (MRI) contrast agents
Guillevic, Erwan. "Verres et vitrocéramiques de chalcogénures : nouveau procédé de synthèse et dopage par les ions lanthanides". Rennes 1, 2009. http://www.theses.fr/2009REN1S116.
This study has shown that substitution of selenium by sulfur in a germanium-free glass improves its optical properties without decreasing its mechanical strength. It has also been proven that it is possible to synthesize chalcogenide glasses reproducibly in an open system. Structural investigations carried out on a sulfide glass system submitted to a heat treatment indicate a two-step crystallization process. Erbium ions, whose nucleating action on this glass appeared to be stronger than the action of neodymium ions, can be incorporated in the crystalline phases, which leads to stronger light emission peaks in the glass-ceramics compared to the base glass. Adding ytterbium to erbium doped sulfide glass-ceramics increases visible light emission of the erbium ions by upconversion if they are pumped in the near infrared
CHERFA, SAMY. "Etude structurale de la complexation de l'uranyle et des ions lanthanides par des calixarenes fonctionnalises par le cmpo". Paris 11, 1998. http://www.theses.fr/1998PA112346.
Rétot, Hélène. "Elaboration de céramiques transparentes d'oxydes mixtes dopés par des ions lanthanides et caractérisation de leurs propriétés de scintillation". Paris 6, 2009. http://www.theses.fr/2009PA066217.
Vallerini, Barbosa Itália. "Nanocristaux oxydes luminescents pour le développement de nanosondes de température in vivo". Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALI125.
Biological thermal modifications are common events during abnormal cellular metabolic activities. Indeed, thermal aberrations – such as an increase in local tissue temperature – are directly related to the detection of inflamed areas, the presence of tumors, or other diseases. In addition to contributing to the diagnosis of diseases, the determination of local temperature in biological systems can also help with their treatment. For instance, in hyperthermia, the increase in temperature must be induced in tumor tissues up to cytotoxic levels in order to kill cancer cells and therefore, it assists in the cancer treatment. However, the increase in temperature must be carried out in a controlled and well-localized manner to target cancer cells, while avoiding overheating of surrounding healthy tissue. Furthermore, to determine such biological aberrations, temperature variations must be accurately determined. The thermometric performance of the nanothermometers was determined by calculating the relative thermal sensitivity (S_r) using the ratiometric luminescence intensity approach. Furthermore, our study made it possible to raise some hypotheses that can effectively contribute to the thermometric performance of thermal probes. We use the technique of the intensity ratio of two luminescence peaks for which the values of S_r can be optimized by co-doping the nanocrystals with two, or more, Ln3+ ions and by using oxide matrices presenting different phonon energies. Thus, due to its generic nature and synthesis flexibility, the Pechini method was chosen to synthesize several oxide matrices, Y2O3, Y2Ge2O7, Y3Al5O12 (YAG), Y3BO6 and YBO3. The nanocrystals were firstly monodoped with Nd3+ and posteriorly, codoped with Nd3+ -Yb3+ to improve the thermal probe properties within the biological windows of near infrared. In addition, we optimized the doping concentrations in the host matrices for greater efficiency in luminescence detection in biological organisms. We experimentally observed that Sr values are strongly impacted to the phonon energy of the matrix. We analyzed that by Nd3+ -Yb3+ codoping the thermometric performance of nanocrystals is improved compared to nanocrystals mono doped with Nd3+. Our study of different oxides shows that the YAG and Y2O3 matrices are the most promising matrices for the luminescence nanothermometry in vivo application. Lastly, YAG individual nanocrystals (non-agglomerated as in the case of Pechini syntheses) of size 60 nm and controlled morphology were obtained in solution by the solvothermal method to advance in further studies in biological applications. We observed that the YAG nanothermometers suitable for the purpose have a S_r equal to 0.47 %·K-1 and a thermal resolution of 0.3 K. In vivo experimental tests are required to validate the findings of this study; however, our results obtained on the performance of YAG: Nd3+ -Yb3+ nanocrystals has been showing high potential for in vivo applications of ratiometric luminescence nanothermometry
Lan, Haichao. "Synthèse, croissance cristalline et propriétés optiques de matériaux oxydes dopés avec les ions Dy3+/Tb3+ - Ce3+/ Eu3+/Yb3+ pour une émission laser dans le visible". Electronic Thesis or Diss., Université Paris sciences et lettres, 2022. http://www.theses.fr/2022UPSLC009.
The compact and cost-effective coherent source emitting in yellow and green region (500 ~ 600 nm) is of great interest in the fields of optical display, medicine and biology. Presently, the pervasive methods for generating visible lasers include laser diode (LD), nonlinear frequency conversion, and direct pumping of the gain medium doped with luminescent ions (Pr3+, Sm3+, Tb3+, etc.). In general, Dy3+ as well as Tb3+ have excellent luminescence properties, but the extremely small absorption cross-section is the biggest obstacle to their application and development.This PhD work was aimed at the investigation of novel visible laser crystals on the basis of the Dy3+ or Tb3+ doped oxide crystals, by introducing Ce3+, Eu3+ or Yb3+ as sensitizer ions for enhancing the luminescence properties. Different co-doping proposals including the sensitizer selection and the doping concentration optimization were implemented. In the meantime, various oxide hosts such as CaYAlO4, CaYAl3O7, Lu3Al3Ga2O12, Ca3Sc2Si3O12, Y3Sc2Al3O12 and YAlO3 were selected and synthesized and the co-doped laser crystals based on the above hosts were grown by the Czochralski method. The corresponding optical spectroscopy properties including the absorption, emission, fluorescence lifetime and energy transfer were comprehensively evaluated
Nicodème, Franck. "Etude de complexes à nucléarite limitée renfermant simultanément des lanthanides identiques où différents : nouveaux inhibiteurs de l'anhydrase carbonique". Toulouse 3, 2002. http://www.theses.fr/2002TOU30026.
BRITOS, NATHALIE. "Les gehlenites (ca#2al#2sio#7) activees par des ions lanthanides ln#3#+, nouveaux materiaux laser potentiels : cristallogenese et etude spectroscopique". Paris 6, 1995. http://www.theses.fr/1995PA066275.
FOUCHARD, SEBASTIEN. "Separation americium curium lanthanides : caracterisation structurale et etude du mecanisme de dissolution selective de l'americium par les ions ferricyanure en milieu basique". Paris 11, 2000. http://www.theses.fr/2000PA112354.
Bertry, Laure. "Elaboration de nanostructures cœur-couronne or-silice dopées par des ions lanthanides pour l'exaltation de la luminescence dans les fibres optiques de spécialité". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-00967580.
Bertry, Laure. "Elaboration de nanostructures cœur-couronne or-silice dopées par des ions lanthanides pour l’exaltation de la luminescence dans les fibres optiques de spécialité". Paris 6, 2013. http://www.theses.fr/2013PA066396.
This work is part of the Fenoptic ANR project, which aims at taking advantage of the plasmonic properties of metallic nanoparticles incorporated into optical fibers. Optical signals attenuation occurring for long distances propagation is usually overcome by re-amplification. Optical amplification is based on rare earth ions stimulated emission. This work aims at improving the amplification process in optical fibers by efficiently coupling lanthanide ions with metallic nanoparticles to enhance their luminescence properties. Original multilayer nanostructures made of a gold core coated with sol-gel silica shells, either pure or doped with lanthanide ions, were specifically designed by soft chemistry. The size and shape of the gold nanoparticles, along with the thickness and doping rate of the silica shells, were finely controlled. Stable core-shell suspensions were thus obtained. Optical reference nanostructures were also prepared by gold core dissolution. These nanostructures are then incorporated into sol-gel silica matrices with high optical quality to study their photoluminescence intensities and lifetime decay profiles. Strong europium (III) luminescence quenching is observed for a 2 nm spacer between the gold nanospheres and the lanthanide ions. This extinction slightly decreases as the coupling distance increases, but still occurs for a 28 nm buffer layer thickness. Incorporation of the nanostructures into optical fibers silica cores was evaluated for a high-temperature process patented by Draka. Some preliminary trials were also conducted on a semi-industrial sol-gel process
Bedel, Sébastien. "Oligohétérocycles dérivés de la pyridine et du pyrazole : synthèse et application à la photosensibilisation des ions EuIII et TbIII". Toulouse 3, 2004. http://www.theses.fr/2004TOU30079.
Couchet, Jean-Marc. "Nouveaux complexes luminescents d'ions lanthanides Eu3+ et Tb3+ à motifs acide diéthylène triamine N,N'n,N''-triacétique : synthèse et propriétés photophysiques". Toulouse 3, 2002. http://www.theses.fr/2002TOU30114.
VIANA, Rodrigo da Silva. "Novos polímeros de coordenação 1d utilizando o ácido 4,4’-sulfonildibenzóico e íons ln3+: avaliação estrutural e estudo espectroscópico". Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/22384.
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CNPQ, FACEPE, CAPES, INCT-INAMI
Este trabalho descreve a síntese de novos polímeros de coordenação utilizando o ácido 4,4’-sulfonildibenzóico (H2SDA) e os íons lantanídeos La3+ e Eu3+. Para a formação dos polímeros de coordenação, o H2SDA foi combinado com o sal Ln(NO3)3.6H2O (Ln = La ou Eu) em DMF, utilizando a metodologia de cristalização convencional. Os cristais obtidos utilizando o Lantânio e Európio, LaSDA e EuSDA respectivamente, apresentaram-se na forma de bastões alongados, com seis faces planas, incolores e transparentes. Uma diminuição na transparência é observada, na direção da cor esbranquiçada, à medida que o sólido é exposto ao ar. A espectroscopia de infravermelho evidencia a formação de um composto de coordenação, possuindo ligantes com modos de coordenação do tipo ponte. A difração de raios-X de monocristal para o LaSDA mostra a obtenção de um polímero de coordenação unidimensional, com formação de um sistema bimetálico, intercontectado por átomos de carbono, que se arranja na conformação de Paddle-Wheel. A difração de raios-X de pó não se mostrou satisfatória, entretanto pôde-se indicar que os padrões do LaSDA e do LaSDA simulado a partir dos dados de raios-X de monocristal possuem algumas similaridades. A comparação do LaSDA simulado e EuSDA sugere que eles não possuem a mesma estrutura cristalina. A espectroscopia de fotoluminescência revela informações sobre o comportamento do ligante no polímero de coordenação, por intermédio do espectro do composto LaSDA. Informações sobre o ambiente químico do íon Eu3+ foi determinado para o espectro do composto EuSDA. Este pôde ser classificado como possuindo um sítio de simetria sem centro de inversão, o que restringe o seu grupo pontual para C1, Cn, Cnv e Cs ou na direção de alguma simetria que se aproxime destas. Além disso, o EuSDA apresentou uma ótima eficiência quântica de emissão de 73% o que o caracteriza como um bom fósforo. A comparação dos espectros de emissão para os compostos EuSDA e o EuSDA* (material após remoção do solvente) mostra modificações no padrão de linhas que está relacionado com a mudança de simetria na vizinhança do íon Eu3+ após a remoção do DMF.
This work describes the synthesis of new coordination polymers using 4,4’-sulfonildibenzoic acid and the lanthanide íons La3+ and Eu3+. In order to form the coordination polymers, H2SDA was combined with the salt Ln(NO3)3.6H2O (Ln = La ou Eu) in DMF, under conventional, open crystallization conditions. Both LaSDA and EuSDA crystals were obtained as colorless, transparent and rectangular crystals. A decrease in transparency towards white is observed with exposure of either solid to air. Infrared spectroscopy demonstrates the formation of a coordination compound, with ligands coordinating through bridge-type modes. Single crystal X-ray diffraction for LaSDA shows that a one-dimensional coordination polymer was obtained, forming a bimetallic system connected through O-C-O moieties arranged in a paddle-wheel configuration. Powder X-ray diffraction was not satisfactory, but it indicated that the experimental pattern from LaSDA and the one simulated the single crystal data feature several similarities. Comparison between LaSDA and EuSDA suggests that they are not isostructural. Photoluminescence spectroscopy reveals informations on the behavior of the ligand in the coordination polymer by spectra of the LaSDA. Information on the chemical environment of Eu3+ was determined from the luminescence spectrum of EuSDA. It was inferred that it possesses a symmetry site without an inversion center, restricting its point group to C1, Cn, Cnv e Cs or some other symmetry similar to those. In addition, EuSDA presented good quantum efficiency of emission of 73%, characterizing it as a good phosphor. Comparison of the emission spectra for the compounds EuSDA and EuSDA* (material after undergoing solvent removal) showed changes in the line pattern, which is related to the change in symmetry around the ion Eu3+ after DMF removal.
Nasso, Isabelle. "Complexes d'ions Lanthanide(III) dérivés de ligands à motifs polyaminocarboxylique : synthèse, propriétés luminescentes (EuIII, TbIII) et relaxométriques (GdIII". Toulouse 3, 2006. http://www.theses.fr/2006TOU30277.
The interest of Gd(III) organic complexes as contrast agents in Resonance Magnetic Imaging (MRI) has been prouved for a long time. Moreover, the long luminescence lifetime of some lanthanide complexes (Eu(III) and Tb(III)) can be used in many scopes (biology, medical diagnosis, microscopy, fluorescence imaging). In this context and taking into account the parameters required for these two fields, we designed and synthesised bimodal ligands, whose Gd(III) complex is MRI active and Eu(III) and Tb(III) complexes are luminescent. These hepta or nonadentate ligands have an acyclic or macrocyclic structure and integrate a pyridine derivative chromophore. The luminescent properties study of the Eu3+ and Tb3+ complexes showed for some of them very high quantum yields (upper than 49%) and luminescence lifetimes higher than 0. 56 ms. The relaxometric properties (relaxivity, water exchange rate) of some of our Gd(III) complexes are comparable to that of Gd-DTPA which is clinically used
Vercouter, Thomas. "Complexes aqueux de lanthanides (III) et actinides (III) avec les ions carbonate et sulfate. Etude thermodynamique par spectrofluorimétrie laser résolue en temps et spectrométrie de masse à ionisation électrospray". Evry-Val d'Essonne, 2005. http://www.theses.fr/2005EVRY0003.
The prediction of the environmental impact of a possible geological disposal of radioactive wastes is supported by the thermodynamic modelling of the radionuclides behaviour in the groundwater. In this framework, the analogy between lanthanides and actinides(III) is confirmed by a critical analysis of the literature and the comparison with experimental results obtained here. The limiting complex, Eu(CO3)33‑, is identified by solubility measurements in Na2CO3 solutions. Then the formation constants of the complexes Eu(CO3)i3‑2i (i = 1-3) and Eu(SO4)i3‑2i (i = 1-2) are measured by TRLFS. The formation of aqueous LaSO4+ is studied by ESI-MS and is in good agreement with the expected speciation. The enthalpy and entropy of the reaction Cm(CO3)2‑ + CO32‑ = Cm(CO3)33‑ are deduced from TRLFS measurements of the equilibrium constant between 10 and 70°C. The ionic strength effect is calculated using the SIT formula
Ben, Nasr Chérif. "Complexation du nickel (II) et des lanthanides (III) par des phosphoramides bidentes : Application à l'extraction liquide-liquide". Nancy 1, 1986. http://www.theses.fr/1986NAN10032.
Santos, Simei Tarse Sobrinho. "Síntese e caracterização de materiais híbridos siloxano-PMMA dopados com íons Eu(III)". Pós-Graduação em Química, 2014. https://ri.ufs.br/handle/riufs/6058.
Neste trabalho materiais híbridos Siloxano-Polimetacrilato de metila (PMMA) foram sintetizados e dopados com íons Eu(III) provenientes de cloreto e nitrato de európio (III) sólidos, cloreto de európio (III) em solução alcoólica e complexo 3-aminopirazina-2-Carboxílato de lantânio e európio. O hibrido foi preparado a partir dometacrilato de metila (MMA) e do 3-metacriloxi-propil-trimetoxisilano (MPTS), utilizando-se como agente inicializador de polimerização o peróxido de benzoila (BPO). A utilização dametodologia de síntese sol-gel por catálise ácida possibilitou a obtenção de materiais sólidos puros e dopados com diferentes fontes de európio, com características amorfas, como ficou evidente pelos dados de difração de raios X de pó. A inserção de complexo de európiopolicristalino na matriz não alterou as características estruturais da amostra.Observou-se que os materiais que foram dopados com európio em solução, apresentaram maior quantidade de solventes adsorvidos e características estruturais que alteraram as suas propriedades espectroscópicas. As amostras dopadas com sais sólidos apresentaram características estruturais semelhantes. Observou-se que os tempos de vida médios das emissões radiativas aumentam com o tratamento térmico, o que indica que o tratamentoreduz o número de grupos supressores de luminescência no ambiente de coordenação do íon lantanídeo e o caráter não monoexponencial do decaimento é indicativo da presença de diferentes ambientes de coordenação. Pelo RMN do 29Si para as amostras dopadas com solução alcoólica de cloreto de európio são observadas espécies monoméricas(R-Si(OSi)(OH)2), diméricas(R-Si(OSi)2(OH)) e totalmente condensadas(R-Si(OSi)3) com um grau de policondensação de até 78%. Os materiais dopados com o complexo apresentam forte luminescência, exceto as amostras tratadas a 200°C, o que é indicativo da degradação térmica do complexo de coordenação. Observou-se que a presença de solvente alterou a estabilidade térmica das amostras, e que a diferentes tratamentos térmicos e a dopagem com diferentes fontes de európio influenciaram sensivelmente o ambiente de coordenação dos íons Eu(III) nos materiais híbridos orgânico-inorgânicos.
Sudhakaran, Pillai S. "Luminescent materials based on Lanthanide ions". Thesis, Kingston University, 2010. http://eprints.kingston.ac.uk/20413/.
Accorsi, Gianluca <1973>. "Trivalent lanthanide ions: luminescence and applications". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/472/1/Accorsi_Gianluca_Tesi_di_Dottorato_XIX_Ciclo.pdf.
Accorsi, Gianluca <1973>. "Trivalent lanthanide ions: luminescence and applications". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/472/.
El, Ouenzerfi Riadh. "Propriétes thermodynamiques des britholites CaxLay(SiO4)6-u(PO4)uO1, étude des propriétés de fixation et de diffusion des ions lanthanides et transuraniens dans les britholites : application dans le domaine des luminophores et du stockage des déchets nucléaires". Lyon 1, 2003. http://www.theses.fr/2003LYO10025.
Farkas, Ildikó. "Coordination chemistry of actinide and lanthanide ions /". Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3236.
McCaw, Charles Stuart. "Electronic structure of lanthanide ions in crystals". Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298628.
Takasaki, Bryan K. "Lanthanide ions in the development of artificial nucleases". Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28535.
The addition of 20 mM hydrogen peroxide to 2mM La(III) (pH 7.0, 25$ sp circ$C) results in a 34,000 fold increase in the rate of BNPP hydrolysis over that observed in the presence of 2mM La(III) alone and an overall 5 x l0$ sp8$ fold rate increase over the uncatalyzed rate. Incorporation of $ sp{18}$O from hydrogen peroxide into the inorganic phosphate product and evidence from the reaction kinetics and potentiometric titrations indicate that the mechanism involves nucleophilic attack of a La(III) coordinated peroxide dianion upon the substrate.
La(III) hydroxide clusters formed from the combination of La(III) (20 mM) and NaOM (40 mM) rapidly converts an RNA dinucleotide (ApA) to the monophosphates (2$ sp prime$-AMP and 3$ sp prime$-AMP) (t$ sb{1/2}$ = 8 sec at pH 8.7, 20$ sp circ$C). The presence of molecular oxygen does not improve the efficiency of Ce(III) in cleaving ApA; however, it does assist in the cleavage of the monophosphates which are not cleaved by Ce(III) in the absence of O$ sb2$ or La(III).
Aull, Brian Francis. "The impact of ion-host interactions on the 5d-to-4f spectra of lanthanide rare earth ions". Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/40343.
MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.
Includes bibliographical references.
by Brian Francis Aull.
Ph.D.
Crooks, Steven M. "Analysis of the spectra of compounds containing lanthanide ions". Thesis, University of Canterbury. Physics, 1998. http://hdl.handle.net/10092/8144.
CASTELLI, VALLEE BERENGERE. "Protonation et proprietes sequestrantes de l'acide diethylenetriaminepentapropionique vis-a-vis des ions actinides : th#4#+, u#4#+, pu#4#+n lanthanides: pr#3#+, nd#3#+, eu#3#+, gd#3#+, er#3#+, et quelques elements divalents: ca#2#+, zn#2#+, cu#2#+ et hg#2#+". Paris 11, 1991. http://www.theses.fr/1991PA112147.
楊友源 e Yau-yuen Yeung. "Alternative parametrization schemes in lanthanide crystal fieldtheory". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1986. http://hub.hku.hk/bib/B31231044.
Yeung, Yau-yuen. "Alternative parametrization schemes in lanthanide crystal field theory /". [Hong Kong : University of Hong Kong], 1986. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12324863.
Bhiri, Nesrine Mohamed. "Thermométrie, thermomètre primaire et applications phosphores à base de vanadate de terre rare". Doctoral thesis, Universitat Rovira i Virgili, 2020. http://hdl.handle.net/10803/669820.
Hoy en día, la temperatura y la luz ocupan un lugar importante en la investigación científica. Desempeñan un papel dominante en la actividad humana, incluyendo: salud, seguridad, medio ambiente, industria, agricultura, iluminación interior y pública, pantallas 3D en color y volumétricas, conversión de energía, bioimagen y terapia, termometría luminescente, entre otros. Los métodos de termometría a remoto han atraído gran atención como solución para superar los problemas que presentan los dispositivos convencionales debido a su tamaño y a que son invasivos. En esta tesis, cristales de Er3 +-dopado, Er3 + -Yb3 + co-dopado y Er3 + -Eu3 + -Yb3 + tri-dopado Y / GdVO4 se han sintetizados por el método de reacción de estado sólido a alta temperatura para aplicaciones de termometría (termómetros primarios y secundarios) y fósforos. Estos cristales presentan una alta calidad para las aplicaciones requeridas: alta conductividad térmica, baja energía de fonones, sección transversal eficiente para una alta absorción óptica y emisión de iones lantánidos, alta estabilidades térmica/química y alta eficiencia cuántica de fotoluminiscencia. Se han estudiado sus características estructurales y morfológicas, así como sus propiedades luminiscentes, así como sus rendimientos termométricos y de iluminación bajo condiciones de excitación por down y upconversio. Los resultados obtenidos revelan que es preferible operar estos materiales como termómetros bajo condiciones de down conversion para obtener unas mejores sensibilidad térmica y resolución. Trabajando en up conversion, es mejor operar a bajas potencias de excitación para evitar el sobrecalentamiento de los materiales y obtener mejores rendimientos termométricos. Se puede operar como termómetros primarios con bajas potencias de excitación. Los parámetros termométricos obtenidos revelan que estos materiales son excelentes termómetros de luminiscencia en el rango de temperatura de 110-513 K. Finalmente, presentan un alto potencial como fósforos para luz roja, verde y amarilla.
Nowadays, temperature and light are important in scientific research. They play a dominant role for human activities, including: health, safety, environment, industry, agriculture, indoor and public lighting, 3D colour and volumetric displays, energy conversion, bio-imaging and therapeutics, luminescence thermometry, among others. Non-contact thermometry methods gathered important attention as a solution to overcome the problems related with conventional devices, due to their big sizes and invasive nature. In this thesis, Er3+-doped, Er3+-Yb3+ co-doped and Er3+-Eu3+-Yb3+ tri-doped Y/GdVO4 crystals have been synthesized by the high temperature solid-state reaction method for luminescence thermometry (primary and secondary thermometers) and for phosphor applications. These crystals have a good quality for the required applications: high thermal conductivity, low phonon energy, efficient cross-section for high optical absorption and emission of lanthanide ions, high thermal/chemical stabilities and high photoluminescence quantum efficiency. Their structural and morphological characteristics, as well as their optical properties have been studied and evaluated in detail. Their different thermometric and lighting performances have been studied and discussed for both conditions of excitation (Down and Up-conversion). The results of the current thesis reveal that it is preferable to operate these materials as luminescence temperature sensors under a Down-conversion scheme to achieve the best performance in terms of thermal sensitivity and resolution. Under Up-conversion , it is better to operate at low excitation pump power as much as possible to avoid the extra-heating of the materials and then to get higher thermometric performances. Moreover, it was indicated that a perfect primary calibration can be achieved at a lower pump power excitation. Then, the obtained thermometric parameters reveal that these materials can be excellent candidates for luminescence thermometers operating under either Down or Up-conversion conditions in the 110-513 K temperature range. Indeed, they represent a high potential applications as phosphors that generate red, green and yellow light.
COURANT-DENIARD, SYLVIE. "Les acides phosphatoantimoniques h::(n)sb::(n)p::(2)o::(3n+5),xh::(2)o (n = 1,3,5) : synthese, caracterisation, proprietes d'echange, de conductivite protonique et de catalyse". Nantes, 1988. http://www.theses.fr/1988NANT2002.
蔡慶銘 e Hing-ming Michael Chua. "Transition intensities and energy transfer of lanthanide ions in crystals". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B31211409.
Chua, Hing-ming Michael. "Transition intensities and energy transfer of lanthanide ions in crystals /". [Hong Kong : University of Hong Kong], 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13692689.
Sharples, Joseph William. "Cooling rapidly and relaxing slowly with 4f ions". Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/cooling-rapidly-and-relaxing-slowly-with-4f-ions(fab0aa0f-1ab7-4016-9d97-5edf6a629fa8).html.
Ritt, Marie-Claude. "Thermodynamics of interaction of macrocyclic ligands with multivalent ions and organic molecules of biological importance". Thesis, University of Surrey, 1991. http://epubs.surrey.ac.uk/843105/.
Congreve, Aileen. "Responsive lanthanide complexes for metal ion sensing". Thesis, Durham University, 2004. http://etheses.dur.ac.uk/3668/.
Santos, Marina. "ANALYTICAL POTENTIAL OF POLYMERIZED LIPOSOMES BOUND TO LANTHANIDE IONS FOR QUALITATIVE AND QUANTITATIVE ANALYSIS OF PROTEINS". Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2587.
Ph.D.
Department of Chemistry
Sciences
Chemistry: Ph.D.
Santos, Marina. "ANALYTICAL POTENTIAL OF POLYMERIZED LIPOSOMES BOUND TO LANTHANIDE IONS FOR QUALITATIVE AND QUANTITATIVE ANALYSIS OF PROTEINS". Doctoral diss., University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2588.
Ph.D.
Department of Chemistry
Sciences
Chemistry: Ph.D.
Couchman, Samantha M. "Syntheses and structural studies of complexes of mixed donor pyridine/phenol and pyridine/pyrazole ligands". Thesis, University of Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299312.
Viguier, Romain. "Synthèse de nouveaux ligands polypodes : complexation des ions lanthanide en solution aqueuse". Grenoble 1, 1999. http://www.theses.fr/1999GRE10277.
ARTIZZU, FLAVIA. "Light conversion processes in lanthanide-based molecular materials". Doctoral thesis, Università degli Studi di Cagliari, 2015. http://hdl.handle.net/11584/266857.
White, Gaye Francine. "Lanthanide ion binding proteins as in vivo luminescent labels". Thesis, University of East Anglia, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247225.
Waiter, Gordon David. "The NMR proton relaxation effectiveness of paramagnetic metal ions and their potential as MRI contrast agents". Thesis, University of Aberdeen, 1995. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU077829.
Courchesne, Maxime. "Separation of lanthanides and actinides : using ion exchange : mining and nuclear applications". Master's thesis, Université Laval, 2020. http://hdl.handle.net/20.500.11794/40191.
This thesis investigates the use of ion exchange resins to separate actinides (thorium and uranium) from lanthanides (rare earth elements). This versatile method was used in two distinct areas : the mining sector and the nuclear field. The problem encountered in the mining sector consists in the separation of thorium from leachates of rare earth elements (REE) ores. Due to their physical properties similar to REE, thorium and uranium are found within themineral lattice of various REE ores. These radioactive metals are considered by the REE producers as impuritiesand must therefore be removed from the leachate. As a result, the separation of thorium by ion exchange resinshas been studied on REE leachates. A sulfuric acid leachate provided by Search Minerals and a nitric leachate produced from laboratory tests were used. Two preliminary processes emerged from the results : a process allowing the successive separation of thorium, heavy REE, and light REE in sulfuric leachate and a process allowing the selective and continuous extraction of thorium in nitric leachate.The problem encountered by the nuclear field deals with the recovery of highly enriched uranium contained indifferent nuclear waste. This waste comes from the production of medical isotopes from Chalk River Laboratories(LCR). During production, almost 90% of the uranium is not consumed. The unused uranium is then found in the cemented and liquid wastes. In order to recover the uranium contained in the cemented waste, the ionexchange methods has been tested on various sulfuric leachates of synthetic cemented waste simulating the radioactive cemented waste. For the liquid waste, the ion exchange experiments were done on a synthetic solution mimicking the nitric solution contained in the fissile solution storage tank. Two processes have been developed for each type of waste.
Cullen, Thomas Donovan. "Hydroxyl radical reaction and lanthanide ion complexation kinetics of DTPA". Thesis, California State University, Long Beach, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1524188.
Guillou, Olivier. "Materiaux moleculaires contenant des ions lanthanide(iii) et cuivre(ii) : synthese, structure et proprietes physiques". Paris 11, 1992. http://www.theses.fr/1992PA112261.