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Showing 1 to 20 of 102 for “"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
… 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 (DSPE), …
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Layered Double Hydroxides and the Origins of Life on Earth
… is shown to intercalate into layered double hydroxides in the same manner as other hexacyano anions, such as ferrocyanide and cobalticyanide, with its three-fold rotational axis perpendicular to the hydroxide sheets. The square-planar tetracyano-nickelate(II), -palladate(II), and …
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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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Digestibility of Sunflower Hulls Treated with Sodium, Ammonium, and Potassium Hydroxides
<p>In vitro dry matter digestibility (IVDMD) of sunflower hulls (SFH) treated with sodium hydroxide (NaOH), ammonium hydroxide (NH<sub>4</sub>OH), and potassium hydroxide (KOH) at increasing levels were studied. Tested concentrations of each alkali as percent dry matter (DM) on SFH were 1.63, 2.45, …
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Formation and transformation kinetics of iron oxy-hydroxides and effects of adsorbed oxyanions
Iron (Fe) oxy-hydroxides such as ferrihydrite (Fh) are ubiquitous in surface environments. Because of their high surface area and high reactive surface, they can immobilize environmental contaminants and nutrients (e.g., oxyanions) through adsorption. Ferrihydrite is metastable and eventually …
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The effect of layered double hydroxides on the vulcanisation and properties of elastomer compounds
… 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 were …
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Layered Double Hydroxides: Synthesis, Characterization, and Interaction of Mg-Al Systems with Intercalated Tetracyanonickelate(II)
… it impossible to have both of the required metal hydroxides present simultaneously in the system. An additional synthesis using a halogen as an oxidizing agent also failed to produce material of any characterizable quality.
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Synthesis and Characterisation of Layered Double Hydroxides (LDHs) Using Red Mud and their Environmental Applications
… 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 applications, …
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Study of Substituted Benzenesulfonate-Containing Layered Double Hydroxides and Investigation of the Hexamethylenetetramine Route of LDH Synthesis
… 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 layered double …
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Heats of Neutralization of Sodium and Potassium Hydroxides with Sulfuric and Hydrochloric Acids Measured in an Ice Calorimeter
The heat evolved when a strong acid and a strong base react together in dilute solution affords a test in favor of Hess’s theory of ionization. In the case of the interaction of HC1 with KOH, or NaOH, in solution there is a remarkably close agreement among the values of deltaH. The average value is …
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Interaction between ferric hydroxides and dissolved sulfide in anoxic aquifers: Pathway and kinetics of iron and sulfur products formation
… the influence of chemical properties of ferric hydroxides on the kinetics of electron transfer between S(-II) and Fe(III) and eventually on the formation of different intermediated products, ii) to characterize the properties and the fates of intermediate products, iii) to study the pathway and …
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Surface complexation modeling of Pb(II), Cd(II) and Se(IV) onto iron hydroxides in single and bisolute systems
Many environmental problems require reliable quantitative prediction of the fate and transport of metal ion contaminants in surface and groundwaters. Surface Complexation Models (SCMs) have emerged as the most promising tools for predicting contaminant ion sorption to iron (hydr)oxides. The …
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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)
… 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. The LDH are …
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Synthesis and reactivity of Gold(ΙΙΙ) complexes with pincer ligands
… was found to stabilise monomeric, terminal hydroxides of gold(III) which are reactive synthons for new metal complexes. Chapter 1 explores the chemistry of terminal gold(III) hydroxides and their usefulness in the synthesis of photoluminescent materials. In Chapter 2 we show that …
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