Abstract: A miniaturized electrochemical cell and a method for making it are provided. The method includes preparing at least one inner electrode of an electron conducting or semi-conducting material M1; providing a hollow support made of an electrically insulating material M6 and having at least one internal hollow channel; depositing on the external surface of the support a layer of an electrically conducting material M2; forming a template of colloidal particles of an electrically insulating material M3, on the M2 layer; depositing a layer of an electrically conducting material M4 on the M2 layer; depositing a layer L1 of an electron conducting or semi-conducting material M5 on the M4 layer, introducing the at least one inner electrode into the at least one internal hollow channel of the obtained structure; stabilizing the structure at its two open ends with an electrically insulating material M7; and removing M2, M3, M4 and M6 materials.

Abstract: The invention relates to an electrochemical method and device for detecting and/or quantifying sulphur dioxide (S(¾) in its various uncomplexed forms (molecular and ionic) in an aqueous or hydroalcoholic liquid food product. It also relates to a method for regenerating an electrode, the active surface of which is composed of gold. The electrochemical method for detecting and/or quantifying sulphur dioxide (SO2) in its uncomplexed (free) forms in an aqueous or hydroalcoholic liquid food product of the invention comprises: a) introducing into the liquid food product a measuring electrode, the active surface of which, in contact with the liquid food product is entirely made of gold, b) measuring the variation of the current produced by the oxidisation of the free SC½, present in the food liquid, during a potential sweep by cyclic voltammetry. In particular, the invention is used for measuring free S(¾).

Abstract: A miniaturized electrochemical cell and a method for making it are provided. The method includes preparing at least one inner electrode of an electron conducting or semi-conducting material M1; providing a hollow support made of an electrically insulating material M6 and having at least one internal hollow channel; depositing on the external surface of the support a layer of an electrically conducting material M2; forming a template of colloidal particles of an electrically insulating material M3, on the M2 layer; depositing a layer of an electrically conducting material M4 on the M2 layer; depositing a layer L1 of an electron conducting or semi-conducting material M5 on the M4 layer, introducing the at least one inner electrode into the at least one internal hollow channel of the obtained structure; stabilizing the structure at its two open ends with an electrically insulating material M7; and removing M2, M3, M4 and M6 materials.

Abstract: A method for manufacturing a miniaturized electrochemical cell and a miniaturized electrochemical cell is provided. The method includes the following steps: a) forming a colloidal template of colloidal particles made of an electrically insulating material, on a substrate made of an electrically conducting material, b) depositing by electrodeposition in the void spaces of the colloidal template, at least three alternating layers forming a repeating unit, the alternating layers being made of an electron conducting material or a semi -conducting material, the intermediate layer(s) being made of a material M3 different from materials M1 and M2 constituting respectively the upper and lower layers, the material M3 having a standard potential lower than the standard potentials of the materials M1 and M2, c) removal of the material M3 of intermediate layer(s), and d) removal of the colloidal particles of the upper and lower layers to obtain the desired electrodes.

Abstract: The invention relates to nanometric or mesoscopic dissymmetric particles, and to a method for preparing the same. The particles have an inorganic part A and a spherical organic part B bound by physicochemical or covalent interactions. Material A is a metal oxide, a metal or a metal chalcogenide. Material B is a polymer consisting of recurrent units derived from a vinyl compound. The particles are obtained by modifying the surface of material A particles with a coupling agent C having a function FC which exhibits affinity for the polymer, and contacting the modified inorganic particles with the precursor(s) of the polymer B, in the presence of a free radical initiator and of a surfactant in solution in a solvent.

Abstract: 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.

Abstract: The invention relates to nanometric or mesoscopic dissymmetric particles, and to a method for preparing the same. The particles have an inorganic part A and a spherical organic part B bound by physicochemical or covalent interactions. Material A is a metal oxide, a metal or a metal chalcogenide. Material B is a polymer consisting of recurrent units derived from a vinyl compound. The particles are obtained by modifying the surface of material A particles with a coupling agent C having a function FC which exhibits affinity for the polymer, and contacting the modified inorganic particles with the precursor(s) of the polymer B, in the presence of a free radical initiator and of a surfactant in solution in a solvent.