Ecole Polytechnique

Centre National De La Recherche Scientifique

Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Université Versailles Saint-Quentin-En-Yvelines

Pascal Le Floch

Julien Thuilliez

Guillaume Cortial

Francois Nief

Nicolas Mezailles

Arnaud Etcheberry

Benoit Dubertret

Anne-Marie Goncalves

Nicolas Mézailles

Xavier Le Goff

Benoît Dubertret

Charles Mathieu

Steven Van Zutphen

Jacky Vigneron

Françoise Hervagault

François Nief

Elaine Le Floch

Clémence Le Floch

Paul Le Floch

A method for chemically passivating a surface of a product made of a III-V semiconductor material in which a) a P(N) polymer film is formed by deposition in a solvent comprising liquid ammonia. The film is formed by deposition, without electrochemical assistance, in the solvent, in the presence of an oxidizing chemical additive comprising phosphorous and generating electrical charge carriers in said surface.

Method for chemically passivating a surface of a product made of a III-V semiconductor material and the product obtained by such a method

The present invention relates to a novel catalytic system for polymerization, and more particularly for preparing conjugated diene polymers bearing a polar function at the chain end. This catalytic system is based on a metal salt of a rare-earth metal and, as alkylating agent, an organometallic compound based on a metal belonging to the 2column or the 13column of the Periodic Table, capable of transferring a polar function to the diene elastomer during the conjugated diene polymerization step. The novel catalytic system makes it possible to reduce the steps for synthesizing a chain-end functionalized elastomer, while ensuring optimal functionalization, advantageously close or equal to 100%.

Catalytic system for conjugated diene polymerisation, polymerisation method and functional polymer obtained

The present invention relates to a novel organometallic compound based on a divalent metal belonging to the 2column of the Periodic Table that can be used as an alkylating agent in a catalytic system based on a rare-earth metal. This novel compound corresponds to the formula: 

Organometallic compounds containing a metal belonging to the second column of the periodic table, and method for preparing same

The subject of the invention is a method of synthesizing a compound MPwhere M is an element belonging to one of columns II to XV of the Periodic Table of the Elements or to the family of lanthanides or to the family of actinides, characterized in that it includes the reaction of x moles of compound comprising the element M in its oxidation state 0 with y/4n moles of compound (P). The method of the invention may be carried out at a temperature much lower than those necessary in the methods of the prior art. It also allows low-temperature formation of nanoparticles and stoichiometric reaction control. The applications of this method are numerous: magnetic ferro-magnets for MnP and FeP; hydrodesulfurization catalysts for NiP; luminescent nanoparticles for biological applications; microelectronics and optoelectronics for InP; and electronics for GaP. The latter two phosphides are also used in the photovoltaic energy field.

Method of synthesizing phosphide materials

The invention relates to a compound comprising at least one polymeric chain incorporating phosphorus atoms and consisting, in all or in part, of identical or different repeated units, each of said units being represented by the following formula: wherein Xrepresents &#x2014;[Si(O)]&#x2014;; or &#x2014;O&#x2014;[Si(RR)O]&#x2014; with Rand Rbeing, independently of each other, a C-Calkyl or alkoxy group, a C-Caryl group; or a mono- or polyorganosilicate derived radical; or &#x2014;N(R)&#x2014; with Rbeing &#x2014;H, a C-Calkyl group or a C-Caryl group, optionally substituted with &#x2014;OH or &#x2014;NH, or at least one unit of general formula (I), and &#x2550;Xrepresents an electron pair, &#x2550;O, &#x2550;S, &#x2550;NRwith Rrepresenting a C-Calkyl group or a C-Caryl group, &#x2550;Se or &#x2550;Te, and its use for complexing metal atoms.

Metal-polymer coordination complex incorporating phosphorus atoms and applications using such a complex

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Orsay, France

Pascal Le Floch