Abstract: A material that can be used for detecting at least one alkaline element in cationic form chosen from polymers or inorganic materials, the material being functionalised by at least one group, referred to as group A, comprising one or more aromatic rings, the or all or a portion of the aromatic rings comprising at least one imine substituent and the or all or a portion of the aromatic rings comprising at least one atom carrying a free doublet within the or all or a portion of the rings and/or at least one other substituent different from an imine substituent comprising at least one atom carrying a free doublet.

Abstract: A method for forming a layer of single-phase oxide (Fe, Cr)2O3 with a rhombohedral structure on a steel or super alloy substrate, may include, successively: (a) supplying a steel or super alloy substrate covered with a surface layer, the steel including at least 2 wt.-% chromium; (b) removing the surface layer in an atmosphere containing at least 0.2 atm O2, creating a level of micro-deformation in the crystal lattice of the steel or super alloy that is greater than 1.0.10?3, and a heating at a heating rate higher than 400° C./s, such as to form a layer of rhombohedral oxide (30) (Fe, Cr)2O3; and (c) carrying out a thermal treatment, in the presence of air, at a water partial pressure of less than 10.000 ppm, and at a temperature varying in a range of from 400 to 1000° C., such as to grow the layer of rhombohedral oxide formed in the removing (b) to a thickness in a range of from 70 to 150 nm.

Abstract: A thermo-fluorescent optical fiber including a core able to propagate light and a sheath, the fiber carrying at least at one of its ends or at one site along its length, devoid of sheath, the optical fiber being provided with a probe consisting of a matrix having thermo-fluorescent particles, the matrix being photo-polymerized. Also provided is a method that relates to manufacturing such an optical fiber as well as to its applications.

Abstract: A material that can be used for detecting at least one alkaline element in cationic form chosen from polymers or inorganic materials, the material being functionalised by at least one group, referred to as group A, comprising one or more aromatic rings, the or all or a portion of the aromatic rings comprising at least one imine substituent and the or all or a portion of the aromatic rings comprising at least one atom carrying a free doublet within the or all or a portion of the rings and/or at least one other substituent different from an imine substituent comprising at least one atom carrying a free doublet.

Abstract: The invention relates to a method for forming a layer of single-phase oxide (30) (Fe, Cr)2O3 with a rhombohedral structure on a steel or super alloy substrate (10), comprising the following successive steps: a) supplying a steel or super alloy substrate (10) covered with a surface layer, the steel comprising at least 2 wt.-% chromium; b) removing the surface layer in an atomsphere containing at least 0.2 atm dioxygen, creating a level of micro-deformation in the crystal lattice of the steel or super alloy that is greater than 1.0.10?3, and a heating at a heating rate higher than 400° C./s, such as to form a layer of rhombohedral oxide (30) (Fe, Cr)2O3, c) carrying out a thermal treatment, in the presence of air, at a water partial pressure of less than 10.000 ppm, and at a temperature varying between 400° C. and 1000° C., such as to grow the layer of rhombohedral oxide formed in step (b) to a thickness from 70 nm to 150 nm.

Abstract: A method of optical marking of products by either applying a composition including at least one lanthanide complex and a vehicle on at least part of a surface or a product, or incorporating a composition including at least one lanthanide complex and a vehicle into at least part of a product. The lanthanide complex is according to Formula I: [Ln(L)3]3?.

Abstract: The present invention relates to a particle comprising a core which comprises an oxide selected from rare earth oxides alone or in a mixture with metal oxides and which is coated with a layer of silica functionalized with a coupling agent comprising at least one chemical function soluble in a hydrophobic solvent, and to a composition comprising at least one such particle. The present invention likewise relates to the method for preparing same and to various uses thereof.

Abstract: The invention relates to a liquid metal emulsion. The emulsion according to the invention includes a liquid metal selected from among gallium, indium, and the alloys thereof, and a solvent that is an alkanethiol. The invention is useful in particular in the field of manufacturing thin films.

Abstract: At least one lanthanide complex for optical marking of products, compositions for optical marking of products, and an optical marking method including an application step of these compositions.

Abstract: A porous silicon zone is metallized by performing in situ reduction of metallic ions dissolved in an aqueous solution and fixing of the metallic particles obtained on said zone in a single step. This step consists in particular in bringing the solution containing the metallic ions into contact with the zone to be metallized, the surface whereof has previously been functionalized to enable in situ reduction of the metallic ions and fixing of the metallic particles. Functionalization of the porous silicon zone is achieved by grafting two particular and distinct types of chemical functions. The first function used is a chelating chemical function for the metallic ions and/or for the metal corresponding to the metallic ions, whereas the second function is a reducing chemical function for the metallic ions. Such a metallization can be used for producing an electrically conducting porous diffusion layer of a fuel cell.

Abstract: The invention relates to a microfluidic device for making a liquid/liquid or gas biphasic system using a first liquid or a gas and a second liquid, non-miscible with each other, the device having a first hydrophobic surface for the second liquid, the first liquid forming a layer (6) on said first hydrophobic surface. The device comprises means for introducing a drop (7) of the second liquid into the layer of first liquid or gas and in contact with said first hydrophobic surface, and means for displacing the drop on said first hydrophobic surface along a determined path, the device having on the path of the drop, at least one wetting defect causing, upon passing of the drop over this defect, failure of the triple line of contact of the drop on the first hydrophobic surface and inclusion of first liquid (8) or gas into the drop. The invention also relates to the associated method.

Abstract: What is provided includes a nanoparticle of porous silica, incorporating at least one molecule of interest, the silica network inside said nanoparticle being functionalized by at least one group capable of setting up an ionic and/or hydrogen non-covalent bond with the molecule of interest, whereby the molecule(s) of interest is(are) linked to the silica network solely by non-covalent bonds. In addition, a method for preparing said silica particle and uses thereof is provided.

Abstract: The present invention relates to a silica particle comprising at least one complex of at least one lanthanide and of at least one ligand of formula (A) in which Z1, Z2 and Z3, which may be identical or different, each represent a group bearing an atom bearing a lone pair and/or a negative charge; R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11 and R12, which may be identical or different, each represent a hydrogen, an optionally substituted alkyl radical, an optionally substituted aryl radical, a halogen, a group —OR13 or a group —SR13, with R13 representing H, an optionally substituted alkyl group or an optionally substituted aryl group.

Abstract: The invention relates to the use of a metal organosilicate polymer as a dispersion-forming agent. The metal organosilicate polymer used in the invention has one of the following formulae I and II: R4Si4Al2O8(OH)x??Formula I: R8Si8M6O16(OH)y??Formula II: The invention finds application in the field of dispersions of hydrophobic compounds in water and of organophobic compounds in an organic solvent, in particular.

Abstract: A composition including: a dispersion of particles of at least one oxide of at least one luminescent rare earth, disaggregated and stabilized in a hydrophobic liquid medium to which at least one surfactant is added, in which said surfactant is a non-ionic surfactant having an HLB (hydrophilic-to-lipophilic balance) lower than 12.

Abstract: In the invention, use is made of at least one metal organosilicate polymer, in the form of particles, having one of the following formulae I and II: R4Si4Al2O8(OH)x,??Formula I: R8Si8M6O16(OH)y,??Formula II: for the protection from oxidation and/or electromagnetic radiation of a compound sensitive to oxidation and/or to electromagnetic radiation. The invention finds application in particular in the field of the protection from oxidation and photoaging of various materials.

Abstract: The present invention relates to a particle comprising a core which comprises an oxide selected from rare earth oxides alone or in a mixture with metal oxides and which is coated with a layer of silica functionalized with a coupling agent comprising at least one chemical function soluble in a hydrophobic solvent, and to a composition comprising at least one such particle. The present invention likewise relates to the method for preparing same and to various uses thereof.

Abstract: A porous silicon zone is metallized by performing in situ reduction of metallic ions dissolved in an aqueous solution and fixing of the metallic particles obtained on said zone in a single step. This step consists in particular in bringing the solution containing the metallic ions into contact with the zone to be metallized, the surface whereof has previously been functionalized to enable in situ reduction of the metallic ions and fixing of the metallic particles. Functionalization of the porous silicon zone is achieved by grafting two particular and distinct types of chemical functions. The first function used is a chelating chemical function for the metallic ions and/or for the metal corresponding to the metallic ions, whereas the second function is a reducing chemical function for the metallic ions. Such a metallization can be used for producing an electrically conducting porous diffusion layer of a fuel cell.

Abstract: This optical coding device comprises a plurality of aggregates suitable for emitting infrared, visible or ultraviolet rays by luminescence, at least one of the said aggregates comprising at least one luminophore. This aggregate further comprises at least one particle consisting of a surface plasmon effect material, the said luminophore and the said particle being suitable for entering into interaction.

Abstract: Dispersion of particles of at least one oxide of at least one luminescent rare earth, disaggregated and stabilized in a hydrophobic liquid medium containing at least one surfactant, in which the said surfactant is a non-ionic surfactant having an HLB (hydrophilic-to-lipophilic balance) lower than 12. Method for preparing the dispersion. Varnish comprising the said disaggregated, stabilized and dispersed particles, and its method of preparation. Method for making substrates with the said varnish and substrate thereby marked. Method for identifying objects provided with a marking using the said varnish.