Centre National De La Recherche Scientifique

Université Paul Sabatier (toulouse Iii)

Angela Dumas

Christophe Le Roux

Pierre Micoud

Francois Martin

Cyril Aymonier

François Martin

Eric Ferrage

Sabine Petit

Emmanuel Gardes

Cedric Slostowski

A method for preparing a composition including mineral particles functionalized by at least one organic group and having a specific surface defined according to the BET method greater than 500 m/g, involves: &#x2014;choosing a phyllosilicate composition, including mineral particles having a thickness of less than 100 nm, a largest dimension of less than 10 &#x3bc;m and belonging to the family of lamellar silicates; &#x2014;choosing at least one functionalizing agent, from the group formed from the oxysilanes and oxygermanes having at least one organic group, &#x2014;bringing the phyllosilicate composition into contact with a functionalizing solution including the functionalizing agent, so as to obtain a phyllosilicate composition including mineral particles functionalized by the organic group, while choosing the organic group from the group formed from the cationic heteroaryl groups, the quaternary ammonium groups and the salts of same. The phyllosilicate composition obtained by the method is also described.

Method for preparing a composition comprising functionalised mineral particles and corresponding composition

A composition comprising synthetic mineral particles, such as silicate or phyllosilicate mineral particles, is presented. The composition can be prepared by a process in which a hydrogel precursor of the synthetic mineral particles is produced by a coprecipitation reaction between at least one compound comprising silicon, such as sodium metasilicate, and at least one compound comprising at least one metal element, such as a dicarboxylate salt of the formula M(R&#x2014;COO), wherein Ris H or an alkyl group having 1 to 4 carbon atoms. The coprecipitation reaction also takes place in the presence of at least one carboxylate salt of formula R&#x2014;COOM' wherein M&#x2032; is Na or K, and Ris H or an alkyl group having 1 to 4 carbon atoms.

Composition containing synthetic mineral particles and a process for preparing the composition

A process for preparing phyllomineral synthetic particles formed from constituent chemical elements in stoichiometric proportions including at least one chemical element selected from the group formed from silicon and germanium, and at least one chemical element selected from the group formed from divalent metals and trivalent metals, by a continuous solvothermal treatment at a pressure above 1 MPa and at a temperature between 100&#xb0; C. and 600&#xb0; C., by making the reaction medium circulate continuously in a solvothermal treatment zone of a continuous reactor () with a residence time of the reaction medium in the solvothermal treatment zone that is suitable for continuously obtaining, at the outlet of the solvothermal treatment zone, a suspension including the phyllomineral synthetic particles.

Process for the continuous preparation of phyllomineral synthetic particles

A method for preparing a composition includes silico/germano-metal particles functionalized by at least one organic group, which involves:&#x2014;carrying out a hydrothermal treatment of a hydrogel precursor of the silico/germano-metal mineral particles, and&#x2014;preparing a hydrogel including silico/germano-metal particles having at least one organic group by co-precipitation in an aqueous medium. A composition including functionalized silico/germano-metal mineral particles of which 1% to 75% of the silicon atoms and/or of the germanium atoms are covalently bonded to at least one organic group is also described.

Method for preparing a composition comprising functionalised silico/germano-metal particles and composition obtained

A method for preparing a novel hydrogel including silico-metallic mineral particles of the formula (Si(Si-A))MO.n'HO, in which: x is a real number in the range [0.75; 1], A denotes a group selected from methyl and hydrocarbon groups including at least one heteroatom, and M is a metal selected from the group consisting of magnesium, cobalt, zinc, copper, manganese, iron, nickel and chromium, wherein a coprecipitation reaction is carried out in an aqueous medium between: at least one metal salt of the metal M, sodium metasilicate, NaOSiO, and at least one water-soluble oxysilane of formula (I): 

Method for preparing a hydrogel comprising silico-metallic mineral particles and hydrogel

A process for preparing a composition including synthetic mineral particles, in which a hydrogel which is a precursor of the synthetic mineral particles is prepared via a coprecipitation reaction between at least one compound including silicon, and at least one compound including at least one metal element, characterized in that the coprecipitation reaction takes place in the presence of at least one carboxylate salt of formula R&#x2014;COOM' in which: &#x2014;M&#x2032; denotes a metal chosen from the group made up of Na and K, and &#x2014;Ris chosen from H and alkyl groups including fewer than 5 carbon atoms. A composition including synthetic mineral particles which is obtained by such a process is also described.

Process for preparing a composition comprising synthetic mineral particles and composition

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 synthetic mineral particles, in which: a hydrogel that is a precursor of the synthetic mineral particles is prepared, and the hydrogel is subjected to a hydrothermal treatment, characterized in that at least one step of the hydrothermal treatment is carried out with the addition of at least one carboxylate salt to the treatment medium, the carboxylate salt having the formula R&#x2014;COOM', where M&#x2032; denotes a metal selected from the group consisting of Na and K, and R is selected from H and the alkyl groups that include fewer than 10 carbon atoms.

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Pechabou, France

Angela Dumas