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Oxidation Numbers

Oxidation Numbers

In redox reactions, the transfer of electrons occurs between reacting species. Electron transfer is described by a hypothetical number called the oxidation number (or oxidation state). It represents the effective charge of an atom or element, which is assigned using a set of rules.

Metal-Ligand Bonds

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...

Alkali Metals

Alkali Metals

Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals

Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....

Properties of Transition Metals

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.

Oxidation-Reduction Reactions

Oxidation-Reduction Reactions

Oxidation–Reduction Reactions

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Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory

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Mesoscopically structured nanocrystalline metal oxide thin films.

Adrian Carretero-Genevrier¹, Glenna L Drisko, David Grosso

¹Institut des Nanotechnologies de Lyon (INL) CNRS - Ecole Centrale de Lyon, 36 avenue Guy de Collongue, 69134 Ecully, France.

|September 17, 2014

Summary

This review details successful strategies for growing mesostructured nanocrystalline metal oxide and SiO₂ films using sol-gel methods. It highlights how substrate interactions and mesostructure influence crystallization and film properties.

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Area of Science:

Materials Science
Nanotechnology
Thin Film Deposition

Background:

Mesoporous thin films require careful control over crystallization processes.
Physicochemical forces, substrate interactions, and mesostructure significantly impact film properties.
Understanding these factors is crucial for developing advanced functional materials.

Purpose of the Study:

To review successful strategies for growing mesostructured nanocrystalline metal oxide and SiO₂ films.
To elucidate the influence of substrate-film relationships and mesostructure on crystallization.
To present and discuss key methods for achieving controlled film growth.

Main Methods:

Sol-gel deposition of precursor solutions.
Thermally induced crystallization of templated mesoporosity.
Mesostructuration of pre-crystallized nanobuilding units.
Substrate-directed crystallization, including epitaxial growth.

Main Results:

Substrate properties influence crystallization temperature and crystallographic orientation.
Mesostructure characteristics (wall thickness, pore curvature) affect crystallite orientation, nucleation, and growth.
Recent advances include epitaxially grown piezoelectric structured α-quartz films from amorphous SiO₂.

Conclusions:

Successful growth of mesostructured nanocrystalline films depends on managing interfacial energies and mesostructural features.
Substrate-directed crystallization offers precise control over crystallographic orientation and properties.
These strategies enable the development of advanced thin films for various applications.