Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"hectorite"”.
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Nonlinear Optically Active Ionically Self-Assembled Monolayer Thin Films of Organic Polymers Intercalated with an Inorganic Hectorite, Laponite RD
… (NLO) active chromophore, and a synthetic hectorite that self-assemble into the noncentrosymmetric structure required for second order nonlinear optical responses. UV/Vis spectroscopy and ellipsometry were used as probes to monitor film growth for upto 25 deposition cycles. Exceptionally …
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The structural environments of cations adsorbed onto clays: A cesium-133 MAS NMR spectroscopic study
… environment of adsorbed cations on the mineral hectorite using $\sp{133}$Cs Variable-Temperature Magic-Angle-Spinning Nuclear Magnetic Resonance (VT-MAS NMR) spectroscopy. The results show that Cs on hectorite occurs in several distinctly different chemical environments, and that motional …
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Studies of clay minerals and their decomposition products
… recrystallisation of illite, montmorillonite and hectorite upon thermal treatment to 1300 C were investigated. Dehydroxylation of the clay minerals occurred between 450 and 750 C, the X-ray crysdallinity of illite and montmorillonite remaining until 800 C. Hectorite gradually recrystallises to …
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The geochemistry of radioactive waste disposal
… addition of simple organic ligands to Ni(Co)-hectorite samples demonstrated the formation of metal complexes in the clay interlayers, although some modified behaviour was observed. Further quantitative examination involving likely groundwater organic constituents and more comprehensive …
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Some mineralogical and physical interpretations of the free- swelling characteristics of montmorillonite-water systems
… (Wyoming bentonite, Otay bentonite, hectorite and nontronite) and several soil clays were selected. In Phase I of the study the differential swelling properties were related to the type of cation on the exchange complex and to variations in the mineralogical properties of the …
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Clay linked Gels : Mechanical Enhancement of Hydrogels by Incorporation of Clay Minerals
… AGM composites by comparing synthetic lithium hectorite (aspect ratio approx. 10000) and montmorillonite PGV® (aspect ratio approx. 30). While the hydrogels could be reinforced by incorporating the different fillers, the tradeoff between swelling capacity and gel strength of the AGM in fully …
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Atomic Force Microscopy Study of Clay Mineral Dissolution
… (biotite and the clays montmorillonite, hectorite, and nontronite) with respect to acid dissolution using in situ atomic force microscopy (AFM). Three techniques are described which make it possible to fix these minerals and other small particles to a suitable substrate for examination in …
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Innovative, Platy Nano-Additives as Efficient Flame Retardants for Polymer Nanocomposites
… including layered double hydroxides (LDHs), hectorite (hect), graphite oxide (GO), or a combination of these. The maximum flame retardant (FR) efficiency can be achieved when these nano-additives are perfectly dispersed in the polymer matrix yielding a maximum specific interface area. Good …
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Organometallic precursors for pillared clay synthesis
The synthetic hectorite, laponite has been used within the paper industry to produce mildly conducting paper for use in electrographic printing. The aim of this research was to modify laponite in order to improve the electrical conductivity. In a continuation of a previous investigation involving …
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Hybrids Based on Layered Silicates
… matrix by combining a shear-stiff synthetic K-hectorite with a tailored surface activity. For this, the synthetic fluorohectorite with very high aspect ratios was organophilized with a specifically designed macroinitiator created by statistical Reversible Addition Fragmentation Chain Transfer …
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Interlamellar modification of smectite clays
… conducting paper. In particular, the synthetic hectorite clay, laponite, is employed to produce paper which is used in automated drawing offices where electro graphic printing is common. The primary objective of this thesis was to modify smectite clays, particularly laponite, to achieve enhanced …
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Lithium at the Thacker Pass deposit, Humboldt County, Nevada, U.S.A.
… >5 layers of altered tephra, and is smectitic (hectorite; Castor, 2010). The LGZ is underlain by the high-grade Li zone (HGZ; 0.4 - 0.8 wt. %), which is comprised by Li-bearing illite clays (tainiolite?; Morisette, 2012) that constitute a 50 - 100-thick section of replaced shaley beds in the …
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Advancing Lithium Extraction from Nevada’s Sedimentary Claystones: Hydrometallurgical Pathways and Sustainability Perspectives
… clay minerals, principally illite, smectite, and hectorite. This structural confinement, combined with abundant acid-consuming carbonate gangue and complex mixed mineralogy, renders conventional extraction approaches technically inefficient. This dissertation presents a systematic four-study …
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Microporous Organically Pillared Layered Silicates (MOPS) with tunable Functionality
… mit Me2DABCO2+ gepillarter, synthetischer K-Hectorite unterschiedlicher Ladungsdichte (0.48, 0.44 und 0.39 p.f.u.) wurde in Kooperation mit der Arbeitsgruppe von Prof. J. Senker NMR-spektroskopisch mit Multikern Festkörper NMR Spektroskopie in Kombination mit hochauflösender 129Xe MAS NMR …