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Showing 1 to 20 of 22 for “"Layered double hydroxides"”.
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Structure and Dynamics of Layered Double Hydroxides
Layered double hydroxides (LDHs) are a complex group of phases with wide ranging technological applications and increasingly recognized geochemical significance. They are unusual among oxide and hydroxide phases in having large anion exchange capacities, and enhancing their application and …
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Layered Double Hydroxides as Anion- and Cation-Exchanging Materials
Layered double hydroxides (LDH) have been principally known as anion-exchanging, clay-like materials for several decades, and continues to be the main driving force for current and future research. The chemical interactions of LDH, with transition metallocyanides, have been a popular topic of …
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APPLICATION OF LAYERED DOUBLE HYDROXIDES IN SOLID-PHASE EXTRACTION
… one of these innovations, dissolvable sorbents, layered double hydroxides (LDHs) and their derivants (e.g., layered double oxide (LDO), Fe3O4@LDO, Fe3O4@LDH, (EDTA-Ni)-LDH), with different structures and properties, in some special and new SPE modes (e.g., dispersive solid-phase extraction …
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Layered Double Hydroxides and the Origins of Life on Earth
… research performed by the author and co-workers. Layered Double Hydroxide (LDH) systems are anion-exchanging clays that have the general formula M(II)xM(III)(OH)(2x+2)Y, where M(II) and M(III) are any divalent and trivalent metals, respectively. Y can be nearly any anion, although modern naturally …
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Layered Double Hydroxides: Morphology, Interlayer Anion, and the Origins of Life
The preparation of layered double hydroxides via co-precipitation of a divalent/trivalent metal solution against a base results in 1 mm LDH particles with a disorganized metal lattice. Research was performed to address these morphological issues using techniques such as Ostwald ripening and …
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The effect of layered double hydroxides on the vulcanisation and properties of elastomer compounds
… in the rubber are desirable. In this work, layered double hydroxides (LDHs) were investigated as alternative crosslinking agents to ZnO in order to either reduce or eliminate Zn in the vulcanisation formulation. Three different stearate modified LDHs, namely CaAl-St, CaZnAl-St and CaFeAl-St …
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Layered Double Hydroxides: Synthesis, Characterization, and Interaction of Mg-Al Systems with Intercalated Tetracyanonickelate(II)
… anion was intercalated into 2:1 and 3:1 Mg-Al layered double hydroxide systems (LDHs). In the 2:1 material, the anion holds itself at an angle of about 30° to the layers, whereas in the 3:1 material it lies more or less parallel to the layers. This is confirmed by orientation effects in the …
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Synthesis and Characterisation of Layered Double Hydroxides (LDHs) Using Red Mud and their Environmental Applications
… RM as a combined source of metal oxides for layered double hydroxides (LDHs) synthesis and evaluates the characteristics of the as-synthesised products and their potential in practical applications. LDHs have received great attention recently for their unique structural properties and diverse …
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Study of Substituted Benzenesulfonate-Containing Layered Double Hydroxides and Investigation of the Hexamethylenetetramine Route of LDH Synthesis
… groups were successfully incorporated into layered double hydroxides of two different compositions, 2:1 Mg-Al LDH and 2:1 Zn-Al LDH. These parent materials were also doped with small amounts of nickel and the differences in the two systems were studied. The hexamethylenetetramine route of …
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Geochemical studies on antimony: antimony dispersion in water draining Su Suergiu mine area; removal of Sb(V) from aqueous solution by layered double hydroxides (LDH)
… a synthetic mineral belonging to the class of layered double hydroxides, that has the advantage, with respect to the other sorbents (metal oxy-hydroxides, organic polymers, etc...), of being able to remove contaminants from solutions at circumneutral pH values often found in the environment. …
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Annular Flow Synthesis and Assembly of Two-Dimensional Materials
… and sub-millisecond micromixing. By synthesizing layered double hydroxides in this reactor over different shear rates, I found that crystallinity and aspect ratio vary non-monotonically with shear. To investigate the dynamics of particle growth I used LTEM to find that layered double hydroxides …
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Novel catalytic methods for the upgrading of coal liquids
… montmorillonite and a tin intercalated laponite, Layered Double Hydroxides (LDH's) have exhibited encouraging thermal stability. Development of novel methods for hydrocracking coal derived liquids, using a commercial microwave oven, modified reaction vessels and coal model compounds has been …
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Chemical and physical characterization of clay bodies
… to be a mix of both clay and non-clay minerals. Layered double hydroxides formed by conventional and microwave methods exhibited interesting characteristics. The main differences between the samples examined were not found to be solely attributable to the differences between microwave and …
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Passive detection of phosphorus in agricultural drainage waters using reactive hybrid anion exchange resins
… magnesium oxides, hybrid anion exchange resins, layered double hydroxides, metal oxyhydroxides, zerovalent iron, and zirconium and lanthanum oxides) and evaluated for the use as a P sink. While the pure resins had a non-selective affinity for P, iron (hydr)oxide coated anion exchange resins …
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Electrochemical oxidation and reduction of 5-hydroxymethylfurfural in alkaline water electrolyzers
… oxidation of HMF is catalyzed by nickel-based layered double hydroxides. Here, the NiFe(-Cl-)-LDH@NF catalyst showed 100% HMF conversion and 100% selectivity towards the desired product 2,5-Furandicarboxylic acid (FDCA), with high stability. Furthermore, it was shown that, in addition to the …
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SYNTHESIS AND CHARACTERIZATION OF ZINC OXIDE BASED NANOSTRUCTURES AND COMPOSITES FOR ENERGY RELATED APPLICATIONS
… of two-dimensional Zinc-Aluminum (ZnAl) layered double hydroxides (LDHs) directly grown on Al substrate by using CBD method. After details structural characterization by SEM, Raman spectroscopy, EDS elemental mapping, and X-ray powder diffraction (XRD), the electrochemical performances of …
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EPR of powders, crystals, and clays of MRI contrast agents: zero field splitting and proton relaxation
… project, Gd DTPA has been intercalated into layered double hydroxides (LDHs) of magnesium and aluminum salts for potential use as a CA. Particularly the Gd DTPA LDHs were intended to target cancerous vasculature and cells. During the project, it was discovered that uptake of the LDHs into …
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Innovative, Platy Nano-Additives as Efficient Flame Retardants for Polymer Nanocomposites
… objective of this work was to explore inorganic layered materials (nano-additives) as innovative flame retardants for polymer nanocomposites. In particular, polystyrene (PS) nanocomposites were prepared with a variety of nano-additives including layered double hydroxides (LDHs), hectorite (hect), …
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