Whirlpool S.a.

Universidade Federal De Santa Catarina (ufsc)

Universidade Federal De Santa Catarina

Valderes Drago

Aloisio Nelmo Klein

Cristiano Binder

Roberto Binder

Fernando Withers Torres

Gustavo Tontini

Cristian Bernardi

Andre Messias Teixeira

A process for the synthesis of nanostructured metallic hollow spherical particles, in which the metal is deposited onto sacrificial masks formed in a polymeric colloidal solution by the electroless autocatalytic deposition method. Deposition releases only gaseous products (Nand H) during the oxidation thereof, which evolve without leaving contaminants in the deposit. The particulate material includes nanostructured metallic hollow spherical particles with average diameter ranging from 100 nm to 5 &#x3bc;m and low density with respect to the massic metal. A process for compacting and sintering a green test specimen are also described.

Process for the synthesis of nanostructured metallic hollow particles and nanostructured metallic hollow particles

The process basically comprises: dissolving a lamellar disulphide, as a source of the solid lubricant, in an aqueous solvent, forming a first aqueous solution; dissolving a reducing agent, as hydroxylamine, sodium hypophosphite or sodium borohydride, in an aqueous solvent, forming a second aqueous solution; mixing the first and second aqueous solutions, forming a third aqueous solution; neutralizing the pH of the third aqueous solution; dissolving a sulphur source, in an aqueous solvent, forming a fourth aqueous solution; mixing the third and fourth aqueous solutions, forming a fifth aqueous solution, which is contained and heated in an autoclave; cooling the fifth aqueous solution to the room temperature; and removing, from the autoclave, the nanoparticles in powder form.

Process for production of nanoparticles of solid lubricant and lubricant dispersions stable in oil and in water

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Florianopolis, Brazil

Valderes Drago