摘要:
The invention relates to the use of nanoparticles of at least one oxide of at least one transition metal doped with a rare earth element, particularly YxVO4Eu1-x nanoparticles obtained through a sol-gel process, as a sensitive material in a chemical sensor for detecting peroxide-compound vapors. The material is used in a liquid process, in a spray of the initial sol, or in a solid thin film after being deposited on a substrate. The inorganic, fluorescent character of the nanoparticles makes it possible to obtain a sensitive material for an optical sensor that has good performance stability over time. The intended uses are the detection of explosives or explosive precursors, particularly peroxides, the control or monitoring of atmospheric pollution and ambient-air quality, and the monitoring of industrial sites.
摘要:
The invention relates to unsymmetrical nanoscale or mesoscopic particles, and to a method for preparing the same.Said particles are characterized by a surface F1 and the zone Z2 carries groups F2 different from the groups F1, the zone Z1 being free of groups F2 and the zone Z2 being free of groups F1. The method of preparation comprises the following steps: 1) the zone Z2 of the surface of the initial particles is masked by fixing a polymer nodule thereto; 2) the masked particles obtained at the end of step 1) are treated in order to modify the nonmasked surface zone Z1 thereof; 3) the polymer nodule is removed after modifying the zone Z1; 4) optionally, the surface of the zone Z2 of the particles is modified following the demasking process.
摘要:
The present invention relates to polymers comprising phenylene units, at least one of which bears a phenylene side group substituted with a perfluoro group or chain, which itself bears an —SO3H, —PO3H2 or —CO2H group.Use of this polymer to make fuel cell membranes.
摘要翻译:本发明涉及包含亚苯基单元的聚合物,其中至少一种具有被全氟基团或链取代的亚苯基侧基,其本身具有-SO 3 H,-PO 3 H 2或-CO 2 H基团。 使用这种聚合物来制造燃料电池膜。
摘要:
The invention relates to polymers comprising phenylene units at least one of which bears laterally a phenylene group which is substituted by a group or a perfluorinated chain which itself bears a —SO3H, —PO3H2 or —CO2H group. The invention also relates to the use of said polymer in forming fuel cell membranes.
摘要翻译:本发明涉及包含亚苯基单元的聚合物,其中至少一种亚烷基单元侧承着被基团所取代的亚苯基或本身具有-SO 3 H,-PO 3的全氟链 H 2 H或-CO 2 H基团。 本发明还涉及所述聚合物在形成燃料电池膜中的用途。