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Showing 1 to 20 of 66 for “"lanthanides"”.
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The Study of Lanthanides for Organometallic and Separations Chemistry
… been previously shown to selectively separate lanthanides. These calix[4]arenes will be attached to a solid support through an alkyl linker at the methylene position and separation will be based primarily on the ionic radius of the metal cation. </p><p>In summary, we report the synthesis and …
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Complexation of trivalent lanthanides by three diphosphonate ligands in the blood plasma
It has been shown that ¹⁵³Sm complexed with the bone seeking ligand ethylene-diaminetetramethylene phosphonate (EDTMP) is effective in pain palliation therapy of bone cancer. Blood plasma models for this ligand with Sm(III) and Ho(III) have been successfully constructed explaining the differences …
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1,2–Dithiolate Complexes of the Lanthanides and Actinides and High– Pressure Studies of f–Element Complexes
The actinide elements are playing larger roles in modern life, finding uses in nuclear energy, remote power sources, medical uses as radiotherapy isotopes, as well as in geological applications in nuclear tools. However, due to their scarcity and radioactivity, their chemistry is not well …
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Lanthanides and quantum dots : time-resolved laser spectroscopy of biochemical Förster Resonance Energy Transfer (FRET) systems
Förster Resonance Energy Transfer (FRET) plays an important role for biochemical applications such as DNA sequencing, intracellular protein-protein interactions, molecular binding studies, in vitro diagnostics and many others. For qualitative and quantitative analysis, FRET systems are usually …
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Predicting the Distribution Coefficient of Solvent Extraction of Rare Earth Elements Based on the Gibbs Free Energy and Thermodynamic Theory for Equilibrium Constant
… (REEs) are a class of 17 elements, including the lanthanides (15 elements), scandium (1 element), and yttrium (1 element). REEs minerals consist of 9-10 REEs excluding promethium. The separation of REEs minerals into their components is achieved by the solvent extraction process, consisting of the …
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Oscillator strength measurements in singly-ionized, doubly-ionized and neutral lanthanides and transition elements (sm, nd, pr, gd, cu, and fe) using laser-induced breakdown spectroscopy.
… radiative properties in astrophysically relevant lanthanides (Gd, Nd, Pr and Sm) and transition metals (Cu and Fe).</p> <p> Nanosecond laser pulses incident on pure elemental targets in a rarified argon environment were used to create high-temperature plasmas. The resulting spontaneous emission …
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The Effect of the Secondary Coordination Sphere on the Stabilities of Cerium(III) and Cerium(IV) Coordination Complexes
The lanthanides, the elements from La–Lu, have intrinsic properties that make them desirable components in many technological applications as well as useful catalysts. However, lanthanides can form unpredictable solid state and solution structures due to their ionic, non-directional, and …
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Advancing solvent extraction technology for improved management of contaminated liquors
… (An) such as americium and curium (Am, Cm) from lanthanides (Ln) in spent nuclear fuel can reduce the radiotoxicity of the eventual waste product as well as the required size and environmental impact of any subsequent geological disposal. In addition, separation of these actinides from the …
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Multiplexed nanoparticle-based immunoassays
… %. Silica nanoparticles doped with luminescent lanthanides were synthesised and used in a model immunoassay system for simultaneous, single-welled detection of human and mouse IgGs. The results indicated the lanthanides are well suited to multiplexed assays, mainly because of their atomic line …
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Understanding aggregation of solvating extractants in applied separations
… process for separation and purification of lanthanides and minor actinides from PUREX process wastes. Distribution data collected for the extraction of trace amounts of fission and corrosion products by TBP in the presence of bulk uranium were mostly consistent with extraction through a …
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Investigating methods for the speed-up of intra-lanthanide chromatographic systems
… of a set of light and a pair of heavy lanthanides. The acid gradient provided by the software was found to be optimized for this set of analytes and provided accurate results for what the chromatogram would look like. This software is intended to be widely applicable to many different …
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Developing Novel Nanoparticulated Imaging System using Luminescence Enhancement of Eu(III) and TB(III) by Single-Strand DNA Encapsulation
… The luminescence of these two lanthanides is weak due to low absorption cross sections. Conversely, the emission of both trivalent ions, upon irradiation, in aqueous solution, is strong when bound to complex ligand systems. The luminescent enhancement is the result of energy …
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Molecular machines constructed from multichromophore arrays
… elements such as ruthenium, indium and lanthanides. The linking of porphyrins to give covalent assemblies suitable for elaboration into machine-like arrays is then described. The synthesis of an array in which four porphyrin units surround a central porphyrin core is described, alongside …
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Upconversion luminescence in Er-codoped NaYF4 nanoparticles
… medicine in health care, nanostructured lanthanides doped sodium yttrium fluoride (NaYF4) represents an exciting class of upconversion nanomaterials (UCNM) which are suitable to bring forward developments in biomedicine and -biodetection. Despite the fact that among various fluoride based …
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Crystal engineering of novel organic-inorganic compounds of N- and O-donor dipyridyl ligands
… These include compounds of actinides, lanthanides, transition and main group metals using dipyridyl ligands (4,4'-bipyridine-N,N'-dioxide (bpdo), 1,2-bis(4-pyridyl)ethane (BPE) and 1,2-di(4-pyridyl)ethylene (OPE) Compounds prepared were characterised by x-ray diffractometry. Thermal …
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Lanthanide Functionalised gold nanoparticles as MRI contrast agents
… DTPA ligand can also chelate strongly with other lanthanides such as Eu3+, Tb3+etc. The luminescence measurements of lanthanides (Eu3+ and Tb3+) loaded onto AuNPs were explored. Lanthanide-loaded AuNPs were also used as model compounds to test an important EPR methodology after labelling with a …
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Polyaminocarboxylic Acids as Potential Candidates for Trivalent Actinide/lanthanide Separations
… trivalent actinides (An(III)s) from trivalent lanthanides (Ln(III)s). Conversely, issues with these reagents have hampered TALSPEAK's implementation as an industrial scale solution. The process requires a high concentration of lactic acid to facilitate phase separations, and the An(III)/Ln(III) …
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Transuranic Imidophosphorane Chemistry
… cathodically shift the redox couples of the lanthanides, facilitating the isolation of these unique compounds. Herein, we present the expansion of this work to the actinides to study the molecular and electronic structures of transuranic imidophosphorane compounds. The isolation, …
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Characterization of Residual Mineral Content of Bauxite Stockpiles in Saline County, Arkansas: An XRD Analysis Approach
… thorium (Th), gallium (Ga), molybdenum (Mo), and lanthanides (Ln). This study examines five stockpiles (SP1, Clay, SP2, SP3, and SP4) in Section 20 of the Aluminum Company of America (ALCOA) Saline County bauxite mine, using Xray Diffraction (XRD) on 25 samples to characterize mineral phases and …
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Photoluminescence Properties of Lanthanide doped Wide Gap Compounds of Interest in Photonics
… of alkaline earth thiogallates doped with lanthanides ions presented in this work, was carried-out characterized by means of time resolved photoluminescence measurements as a function of excitation wavelength and as a function of temperature. Phosphorescence and thermoluminescence …
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