Centre National De La Recherche Scientifique

Université Paul Sabatier (toulouse Iii)

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Luzenac Europe Sas

Universite Claude Bernard – Lyon1

Cpe Lyon Formation Continue Et Recherche

Imerys Talc Europe

Francois Martin

Christophe Le Roux

Pierre Micoud

Angela Dumas

Jean-Pierre Bonino

Eric Ferrage

Jocelyne Ferret

Didier Arseguel

Olivier Grauby

Alain Decarreau

Sabine Petit

Emmanuel Gardes

Cedric Lebre

Philippe Gilet

Cyril Aymonier

Amélie Dussaigne

Chloé Thieuleux

Stéphane Cadot

Stephane Vaillant

Cederic Lebre

Patrice Bacchin

William Vautrin

Elsje Quadrelli

Cedric Slostowski

Philippe Barthes

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 method of preparing a crystalline thin film having a formula MYincludes (1) preparing an MYamorphous film by atomic layer deposition on a surface of a substrate, and (2) annealing the amorphous MYfilm at 350&#xb0; C. or more to provide the crystalline MYfilm. The amorphous MYfilm is formed from at least one metal M precursor and at least one element Y precursor, wherein x is 1.5 to 3.1, M is tungsten or molybdenum, and Y is sulfur or selenium. Step (1) includes a) introducing a first metal M precursor or element Y precursor into a deposition chamber, b) purging with inert gas, c) introducing a second metal M precursor when the first precursor is element Y, or element Y precursor when the first precursor is metal M, d) purging with inert gas, e) repeating steps a) to d), and f) obtaining the amorphous MYfilm.

Method of forming a crystalline thin film having the formula MYusing an ALD-formed amorphous thin film having the formula MYas a precursor

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 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.

Method for preparing a composition comprising coloured silicate mineral particles and a composition comprising coloured silicate mineral particles

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.

Method for preparing a composition including synthetic inorganic particles

A method of manufacturing at least one semiconducting micro- or nano-wire used for formation of an optoelectric structure, optoelectronic structures including the micro- or nano-wires, and a method enabling manufacture of the photoelectronic structures. The method includes providing a semiconducting substrate, forming a crystalline buffer layer on the substrate, the buffer layer having a first zone over at least part of its thickness composed mainly of magnesium nitride in a form MgN, and forming at least one semiconducting micro- or nano-wire on the buffer layer.

Method for manufacturing a semiconductor micro- or nano-wire, semiconductor structure comprising such a micro- or nano-wire, and method for manufacturing a semiconductor structure

The invention relates to a method for preparing a composition, that is a talcose composition, comprising synthetic mineral particles which contain silicon, germanium and metal, have a crystalline and lamellar structure, and are of formula (SiGe)MO(OH), wherein M is at least one divalent metal and is of formula MgCOZnCuMnFeNiCr, and x is a real number of the interval [0; 1]. According to said method, a gel containing silicon, germanium and metal, of formula &#x2014;(SiGe)MO, n'HO&#x2014;, in the liquid state, is subjected to a hydrothermal treatment over a defined period of time and at a temperature of between 300&#xb0; C. and 600&#xb0; C., said time and temperature being selected according to the desired particle size and structural stability for the mineral particles containing silicon, germanium and metal, to be prepared.

Method for preparing talcose compositions comprising synthetic mineral particles containing silicon, germanium and metal

The invention relates to a method for preparing a synthetic talc composition. According to said method, a kerolite composition is subjected to an anhydrous thermal treatment carried out at a pressure lower than 5 bar, from over a few hours up to over a few days, at a treatment temperature higher than 300&#xb0; C. The invention also relates to a synthetic talc composition prepared in this way, the synthetic talc particles of the composition being exclusively of chemical formula &#x2014;(Si)MgO(OH)&#x2014; and identifiable, during X-ray diffraction, by the presence of a characteristic diffraction peak located at a distance of between 9.40-9.68 and corresponding to a plane (001). Said synthetic talc particles also have a thermally stable crystalline structure of stacked laminae, which is very similar to that of a natural talc and has a particle size smaller than approximately ten micrometers.

Method for preparing a synthetic talc composition from a kerolite composition

A method for preparing a composition including mineral particles, that is swelling TOT-TOT interlayer particles, formed by interlayering between: at least one non-swelling mineral phase formed by a stack of elementary laminae of the phyllogermanosilicate 2/1 type and of formula &#x2014;(SiGe)MO(OH)&#x2014;, and at least one swelling mineral phase formed by a stack of elementary laminae of the phyllogermanosilicate 2/1 type and at least one interlaminar space between two consecutive elementary laminae, the swelling mineral phase being of formula &#x2014;(SiGe)MO(OH), (M)&#x3b5;'.nHO. The composition is prepared by subjecting a gel containing silicon, germanium and metal, of chemical formula &#x2014;(SiGe)MO,nHO&#x2014;, in the liquid state to a hydrothermal treatment which is carried out over a defined period of time and at a temperature of between 150&#xb0; C. and 300&#xb0; C., the time and temperature being selected according to the desired structural characteristics for the swelling TOT-TOT interlayer particles to be prepared.

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Sainte Foy d'Aigrefeuille, France

Francois Martin