Centre National De La Recherche Scientifique

Université Paul Sabatier (toulouse Iii)

Emmanuel Gardes

Pierre Micoud

Christophe Le Roux

Francois Martin

Angela Dumas

A process for preparing a magnetic talcous composition including mineral particles, referred to as magnetic talcous particles, having a non-zero magnetic susceptibility, in which, during an oxidative contacting step, talcous particles chosen from the group formed from 2:1 lamellar silicates having a zero electric charge are brought into contact with particles including at least one magnetic iron oxide chosen from the group formed from magnetite and maghemite, the magnetic particles having a mean equivalent diameter of between 1 nm and 50 nm. A magnetic talcous composition including mineral particles, referred to as magnetic talcous particles, having a non-zero magnetic susceptibility, at least 20% by weight of talcous particles and at least 0.5% by weight of magnetic particles is also described.

Process for preparing a magnetic talcous composition, and magnetic talcous composition

A method for preparing a composition including silicate mineral particles that have coloring properties in which a talcose composition, including phyllosilicate mineral particles chosen from the group formed: from the particles having the chemical formula: ((SiGe)MO(OH), the particles having at least one interlayer space and having the chemical formula: (SiGe)MO(OH), (M').nHO: -M having the formula MgCoZnCuMnFeNiCry(8); -M&#x2032;designating at least one interlayer cation, the silicate mineral particles having a thickness of less than 100 nm and of which the largest dimension is less than 10 &#x3bc;&#x3c0;&#x3b9;, is brought into contact with a dye solution, including dye cations, of at least one element chosen from the transition metals, the lanthanides and the actinides. The composition obtained by this method is also described.

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Caen, France

Emmanuel Gardes