Rhodia Operations

The Lubrizol Corporation

Solvay Sa

Lauriane D'Alencon

Virginie Harle

Michael Lallemand

Thierry Le Mercier

David J Moreton

Magali Pudlarz

Malcolm G J MacDuff

Dean Thetford

Valérie Buissette

Julien Hernandez

Marc-David Braida

Joanne L Jones

Thierry Delplanche

Hannah Greenfield

Philippe Barboux

Réka Toth

Sarah Khirani

Yves Antoinette

Beatrice Ortego

Jacinthe Gamon

Marie Plissonneau

Aziz Mimouni

Malcolm GJ Macduff

The invention relates to cerium based core-shell particles having a core of cerium oxide optionally doped with at least one metal (M) and a shell consisting of a plurality of nanoparticles of cerium oxide optionally doped with at least one metal (M'), which can be the same or different from metal (M), formed on the surface of the core particle. The invention also relates to dispersions thereof in a liquid medium, to a process for producing the same and to the use of these particles and dispersions in polishing applications such as chemical mechanical polishing.

Liquid dispersion and powder of cerium based core-shell particles, process for producing the same and uses thereof in polishing

The present invention pertains to a process for preparing particles of rare earth sulfide comprising the steps of:&#x2014;preparing a reaction mixture comprising at least one compound comprising at least one rare earth element (A) and at least one alkali metal sulfide (B),&#x2014;submitting said reaction mixture to a mechanical stress so as to cause a chemical reaction that produces the particles of rare earth sulfide.

Mechanochemical synthesis of rare earth sulfides

A composite comprising a hydroxyapatite and at least one additive which is present during hydroxyapatite synthesis. The additive may be embedded or incorporated into or coated onto the hydroxyapatite. The additive preferably increases the hydroxyapatite porosity, e.g., providing a higher pore volume and/or BET surface area than a hydroxyapatite material without additive. The additive preferably comprises an activated carbon, chitosan, hopcalite, clays, zeolites, sulfur, and/or a metal such as Al, Sn, Ti, Fe, Cu, Zn, Ni, Cu, Zr, La, Ce, in the form of metal, salt, oxide, oxyhydroxide, and/or hydroxide. The hydroxyapatite may be calcium-deficient. The composite is in the form of particles having a D50 of at least 20 &#x3bc;m, a BET surface area of at least 120 m/g; and/or a total pore volume of at least 0.3 cm/g. An adsorbent material comprising a composite or a blend of composite with a hydroxyapatite without additive, and its use for removal of contaminants such as Hg, Se, As, and/or B from an effluent.

Hydroxyapatite composite for use in removal of contaminants from effluents and methods of making

A dispersion includes an apolar organic phase, at least one amphiphilic agent, and solid objects based on particles of an iron compound in crystallized form of small size.

Organic dispersion of iron-based particles in crystallized form

A composition contains an additive for assisting with regeneration of the PF in the form of an organic dispersion of iron particles in crystallized form and a detergent including a quaternary ammonium salt.

Fuel additive composition containing a dispersion of iron particles and a detergent

A fuel additive is formed from dispersions including an organic phase, at least one amphiphlic agent and solid objects based on particles of an iron compound in the crystallized form with a small size, as a fuel additive. The particles have an average sizeof less than or equal to 7 nm measured by X-ray diffraction, and at least 80% by number of the particles have a size Dof less than or equal to 7 nm measured by transmission electron microscopy.

Use of dispersions of iron particles as fuel additive

A composition contains an additive for assisting with the regeneration of the PF in the form of an organic dispersion of iron particles and a detergent including a polyester quaternary ammonium salt.

Fuel additive containing a dispersion of iron particles and an ammonium polyester detergent

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Paris, France

Lauriane D'Alencon