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 20 of 69 for “"Aluminate"”.
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Effect of Processing on Electrical Properties of Calcium Aluminate-Based Chemically Bonded Ceramics
Embargo set by: Seth Robbins for item 72339 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
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Development of magnesium aluminate and gallate chemistry incentivised by potential in rechargeable battery technology
… moiety of charged-separated magnesium organohaloaluminate complexes, relevant to rechargeable Mg battery electrolytes, typically takes the thermodynamically favourable dinuclear [Mg2Cl3]+ form in the solid-state. This thesis reports that judicious choice of Lewis donor allows the deliberate …
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Grain boundary mobility and segregation in non-stoichiometric solid solutions of magnesium aluminate spinel
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1985.
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The Application of Melatonin and Platelet-Rich Plasma in the Development of a Bioactive Calcium Aluminate Bone Regenerative Scaffold
… bone using the ceramic biomaterial calcium aluminate (CA). Calcium aluminate materials are durable and remain moldable for an extended period of time at room temperature. Further, the surfaces of CA scaffolds can be modified with biological agents through simple chemical means to locally …
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Synthesis And Characterization Of Metal Complexes Containing Tetrazolate, Poly(tetrazolyl)borate, And Poly(azolyl)aluminate Ligands As High Energy Density Materials
… on the metal center. A series of poly(pyrazolyl)aluminate complexes containing aluminum-hydrogen bonds has been prepared, and these complexes exhibit similar coordination modes to their poly(pyrazolyl)borate analogues. Pyrazolyl exchange processes occur at room temperature in solution due to the …
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Role of impurities, LiF, and processing on the sintering, microstructure, and optical properties of transparent polycrystalline magnesium aluminate (MgAl2O4) spinel, The
Transparent polycrystalline magnesium aluminate (MgAl2O4) spinel has an exceptional combination of properties that is well-suited to fulfill demanding optical applications that few other materials can satisfy. However, spinel is inherently difficult to densify due to high defect formation energies, …
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Alkali attack of coal gasifier refractory lining
… with alkali attack. The reaction products sodium aluminate (Na₂O·Al₂O₃), N₂C₃A₅ (2Na₂O·3CaO·5A1₂O₃), nepheline (Na₂0·Al₂0₃·2SiO₂), potassium aluminate, (K₂Oâ·Al₂0₃), and kaliophilite (K₂O·Al₂0₃·2Si0₂) were synthesized and their solubility in water and coefficients of linear thermal expansion were: …
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Nanocomposite catalysts for soot combustion and propane steam reforming
… below 400° C. A nanocomposite system of nickel aluminate (NiAl20 4), Re and V has been synthesized for propane steam reforming. Nickel aluminate nanocrystals with various Ni/Al molar ratios were prepared by chemical co-precipitation. They were pretreated in H2 prior to propane steam reforming to …
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Pulsed Laser Deposition of Thin Film Heterostructures
… been grown on Strontium Titanate and Lanthanum Aluminate (100) substrates by pulsed laser deposition. X-ray diffraction results show that the films grown on the Strontium Titanate are amorphous and polycrystalline on the Lanthanum Aluminate. Resistances versus temperature measurements show that …
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Neutral and cationic complexes of the rare earth metals : synthesis, characterisation and polymerisation catalysis
… polymerisation of 1,3-butadiene. In Chapter B.2, aluminate precursors of the type [Ln(AlMe4)3] are utilised to generate the half-sandwich bis(aluminate) neutral species by reaction with HC5Me4SiMe3. Reaction of these neutral precursors with [NEt3H][BPh4] in thf induces the cleavage of both …
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Dry pressed lightweight refractories from Virginia kyanite
… by small additions of bentonite or sodium aluminate. The disruption of the structure of the body during the kyanite’s inversion reaction has been controlled by small additions of Virginia apatite and sodium aluminate and proper heat treatment. Indicative results show that it is possible to …
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An Investigation of the Rheology of Reactive and Nonreactive Highly Filled Polymer Systems
… phases were studied in addition to two calcium aluminate cement-polymer systems of technological interest. The relaxation modulus of the three model reactive systems showed distinguishable signatures of modulus growth characteristic of the active stiffening mechanism in each case. The signatures …
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Processing-property characteristics of a polymer-cement composite
… and mechanical attributes of hardened calcium aluminate cement-poly(vinyl) alcohol (CAC-PVA) composites. Effects of cement particle size and polymer molecular weight were also investigated.
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Effect of Cooling Rates on Mineralization in Portland Cement Clinker
… than other samples and small, more amorphous aluminate and ferrite crystals. With progressively slower cooling rates, less hydraulically reactive silicate minerals with increasingly poor crystal form were observed. Periclase content increased in slower cooled samples and aluminate and ferrite …
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Synthesis and characterization of novel polymer-ceramic nanocomposites: Organoceramics
… on various water soluble polymers and calcium aluminate hydrates. Synthesis of these materials involves the aqueous precipitation of the inorganic crystals in the presence of polymer. The presence of polymer during crystallization often leads to changes in particle morphology, and in some cases …
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Volumetric dimensional changes of luting cements
… to be marketed in the US, is composed of calcium aluminate and glass ionomer. CM is a luting agent indicated for permanent cementation of cast restorations, all-zirconia or all-alumina crowns, and prefabricated metal and cast dowel and cores. The manufacturer claims that the cement has …
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Acid resistance of sewer pipe concrete
… hours or more). A concrete containing calcium aluminate cement and a synthetic alag™ aggregate made from the calcium aluminate cement clinker gave the best resistance to the hydrochloric acid solution (pH of 1,00) and a severely corrosive biologically-induced sulphuric acid environment (pH of …
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Waste to fuel: designing a cobalt based catalyst and process for once-through Fischer-Tropsch synthesis operated at high conversion
… was attributed to both sintering and cobalt aluminate formation. At very high conversion (XCO > 97%) enhanced reversible deactivation was exhibited due to the oxidation and re-reduction Co0 to Co(II)O. This oxidation/reduction cycle is the result of a thermodynamic conversion limit: at a mean …
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Lime Stabilised Murram as a Building Material in Kenya
… results in the formation of calcium silicate-aluminate hydrate (C 2ASHg) and carbonate substituted calcium aluminate hydrate (C4ACo.5H12^ When gypsum is present the principal reaction * product is ettringite which is a calcium sulpho-aluminate hydrate (C3A3CSH32 ).
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High temperature alkali corrosion kinetics of low expansion ceramics
… alumina, resulting in the formation of sodium aluminate which occurs in a relatively planar fashion at low temperatures and in beta-alumina at higher temperatures with an experimental activation energy of 200 kJ/mol. The beta alumina forms in laths along the grain boundaries such that the fast …
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