A device including a near field transducer, the near field transducer including gold (Au) and at least one other secondary atom, the at least one other secondary atom selected from: boron (B), bismuth (Bi), indium (In), sulfur (S), silicon (Si), tin (Sn), hafnium (Hf), niobium (Nb), manganese (Mn), antimony (Sb), tellurium (Te), carbon (C), nitrogen (N), and oxygen (O), and combinations thereof; erbium (Er), holmium (Ho), lutetium (Lu), praseodymium (Pr), scandium (Sc), uranium (U), zinc (Zn), and combinations thereof; and barium (Ba), chlorine (Cl), cesium (Cs), dysprosium (Dy), europium (Eu), fluorine (F), gadolinium (Gd), germanium (Ge), hydrogen (H), iodine (I), osmium (Os), phosphorus (P), rubidium (Rb), rhenium (Re), selenium (Se), samarium (Sm), terbium (Tb), thallium (Th), and combinations thereof.

A device including a near field transducer, the near field transducer including gold (Au) and at least one other secondary atom, the at least one other secondary atom selected from: boron (B), bismuth (Bi), indium (In), sulfur (S), silicon (Si), tin (Sn), hafnium (Hf), niobium (Nb), manganese (Mn), antimony (Sb), tellurium (Te), carbon (C), nitrogen (N), and oxygen (O), and combinations thereof; erbium (Er), holmium (Ho), lutetium (Lu), praseodymium (Pr), scandium (Sc), uranium (U), zinc (Zn), and combinations thereof; and barium (Ba), chlorine (Cl), cesium (Cs), dysprosium (Dy), europium (Eu), fluorine (F), gadolinium (Gd), germanium (Ge), hydrogen (H), iodine (I), osmium (Os), phosphorus (P), rubidium (Rb), rhenium (Re), selenium (Se), samarium (Sm), terbium (Tb), thallium (Th), and combinations thereof.

A method for preparing an anion adsorbent may be provided, which comprises the steps of: mixing at least two metal salts with each other, thereby forming a stack structure in which cationic compound layers and anionic compound layers containing anions and water of crystallization are alternately stacked on one another; performing a first heat treatment on the stack structure to expand between the cationic compound layers, thereby preparing a preliminary anion adsorbent; and performing a second heat treatment on the preliminary anion adsorbent to remove the anions and the water of crystallization from the anionic compound layers while allowing at least one of the anions to remain, thereby preparing the anion adsorbent.

With respect to a plate-shaped hydrotalcite in which the average width of primary particles is increased, (1) the aspect ratio of secondary particles is increased by suppressing aggregation of primary particles by relatively reducing the average thickness thereof, and 2) the formation of a by-product that impairs the transparency of a resin is suppressed. Provided is a plate-shaped hydrotalcite represented by a formula (1) below:

(M.sup.2+).sub.1x(M.sup.3+).sub.x(OH).sub.2(A.sup.n).sub.x/n.mH.sub.2O(1) where M.sup.2+ indicates at least one divalent metal, M.sup.3+ indicates at least one trivalent metal, A.sup.n indicates an n-valent anion, n indicates an integer of 1 to 6, and x and m are within respective ranges of 0.1x0.33 and 0m10, the formula (1) satisfying (A) to (D) below: (A) the average width of primary particles as measured using an SEM method is 1 m or greater; (B) the average thickness of primary particles as measured using an SEM method is 80 nm or less; (C) the degree of monodispersity of width is 50% or greater; and (D) the degree of monodispersity of thickness is 50% or greater.

A heat-ray-blocking fluororesin film includes a heat-ray-blocking metal oxide and a hydrotalcite-type compound represented by Chemical Formula [1], wherein the content of the hydrotalcite-based compound is 0.03 to 1.0 wt %. The heat-ray-blocking fluororesin can exhibit excellent heat-ray-blocking performance while keeping the properties inherent in fluororesin films such as mechanical properties, transparency and long-term weatherability and is transparent and can be used out of doors for a long period of time, wherein
Mg.sup.2+.sub.1a.Al.sup.3+.sub.a(OH.sup.).sub.2.AN.sup.n.sub.a/n.cH.sub.2O
where 0.2a0.35 and 0c1; AN.sup.n indicates n-valent anion.

Provided are a hydrotalcite substance composition having excellent dispersibility, and an additive using the hydrotalcite substance composition. The hydrotalcite substance composition of the present invention contains a hydrotalcite substance and a surface treatment agent containing an organic compound. The hydrotalcite substance is in a state in which at least part thereof is coated with the surface treatment agent. The amount of an extract to be extracted from the composition by hot toluene treatment is 1 wt % or less with respect to the composition, and the content of calcium in the extract is 500 ppm or less with respect to the weight of the composition.

Provided are a hydrotalcite substance composition having excellent dispersibility, and an additive using the hydrotalcite substance composition. The hydrotalcite substance composition of the present invention contains a hydrotalcite substance and a surface treatment agent containing an organic compound. The hydrotalcite substance is in a state in which at least part thereof is coated with the surface treatment agent. The amount of an extract to be extracted from the composition by hot toluene treatment is 1 wt % or less with respect to the composition, and the content of calcium in the extract is 500 ppm or less with respect to the weight of the composition.

A hydrotalcite is represented by formula (1):

(M.sup.2+).sub.1-X(M.sup.3+).sub.X(OH).sub.2(A.sup.n).sub.X/n.mH.sub.2O(1), wherein M.sup.2+ indicates a divalent metal, M.sup.3+ indicates a trivalent metal, A.sup.n indicates an n-valent anion, n indicates an integer of 1 to 6, 0.17x0.36, and 0m10. The hydrotalcite has (A) a lattice strain in the <003> direction is 310.sup.3 or less as measured using an X-ray diffraction method; (B) primary particles with an average width between 5 nm and 200 nm inclusive per a SEM method; and (C) a degree of monodispersity of 50% or greater (degree of monodispersity (%)=(average width of primary particles as measured using the SEM method/average width of secondary particles as measured using a dynamic light scattering method)100). A resin containing the hydrotalcite, a suspension containing the hydrotalcite and a method for producing the hydrotalcite are disclosed.

Activated aluminum sesquichlorohydrate (AASCH) powders prepared by (a) diluting the concentrated aluminum sesquichlorohydrate (ASCH) solution to from about 10% to about 25% by weight, (b) heating the diluted solution to obtain a Band III polymer concentration of at least about 20% and a Band IV polymer concentration of at least about 15%, (c) drying the heated solution to powders, and (d) optionally screen or light mill the powders to free flowing spherical particles are disclosed.

A process of making a dense, cohesive and uniform aluminum oxide coating on a metallic substrate includes electrodepositing polynuclear aluminum oxide hydroxide clusters from a polynuclear aluminum oxide hydroxide cluster solution on a metallic substrate to form a precursor coating, and post-treating the precursor coating to form a final aluminum oxide coating on the metallic substrate.