摘要:
A method for preparing a composition including silicate mineral particles that have colouring properties in which a talcose composition, including phyllosilicate mineral particles chosen from the group formed: from the particles having the chemical formula: ((SixGe1-x)4 M3O10 (OH)2, the particles having at least one interlayer space and having the chemical formula: (SixGe1-x)4 M3-ε O10 (OH)2, (M′m+)ε′.nH2O: —M having the formula Mgy(1)Coy(2)Zny(3)Cuy(4)Mny(5) Fey(6)Niy(7)Cry(8); —M′m+ 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 μπι, 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.
摘要:
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.