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Layered double hydroxides (LDH) are a class of ionic solids characterized by a layered structure with the generic layer sequence [AcB Z AcB] n, where c represents layers of metal cations, A and B are layers of hydroxide (OH −) anions, and Z are layers of other anions and neutral molecules (such as water). [1]
Hydrotalcite, or formerly also völknerite, [6] is a layered double hydroxide (LDH) of general formula Mg 6 Al 2 CO 3 (OH) 16 ·4 H 2 O, whose name is derived from its resemblance with talc and its high water content. Multiple structures containing loosely bound carbonate ions exist.
AFm phases belong to the class of layered double hydroxides (LDH). LDHs are hydroxides with a double layer structure. The main cation is divalent (M 2+) and its electrical charge is compensated by 2 OH − anions: M(OH) 2. Some M 2+ cations are replaced by a trivalent one (N 3+). This creates an excess of positive electrical charges which needs ...
Friedel's salt is an anion exchanger mineral belonging to the family of the layered double hydroxides (LDHs). It has affinity for anions as chloride and iodide and is capable of retaining them to a certain extent in its crystallographical structure.
Layered double hydroxides, a class of layered materials composed of positively charged atomic layers and charge balancing anions located in the interlayer region; Letters Digits Hyphen rule in RFCs defining DNS: RFC 1034, RFC 1035, RFC 1123, RFC 3696, RFC 5890; Human Rights League (France) (French: Ligue des droits de l'homme)
A number of mixed hydroxides are known with stoichiometry A 3 M III (OH) 6, A 2 M IV (OH) 6, and AM V (OH) 6. As the formula suggests these substances contain M(OH) 6 octahedral structural units. [46] Layered double hydroxides may be represented by the formula [M z+ 1−x M 3+ x (OH) 2] q+ (X n−) q ⁄ n ·yH 2 O.
Titanium disulfide is an example of a layered material. The individual sheets are interconnected by van der Waals forces between the sulfide centers.. In material science, layered materials are solids with highly anisotropic bonding, in which two-dimensional sheets are internally strongly bonded, but only weakly bonded to adjacent layers. [1]
It is the archetype of the fougèrite group in the larger hydrotalcite supergroup of naturally occurring layered double hydroxides. [4] The structure is based on brucite-like layers containing Fe 2+ and Fe 3+ cations, O 2− and OH − anions, with loosely bound [CO 3] 2− groups and H 2 O molecules between the layers.