 Non-parallax optical sighting instrument |
| Accordingly, it is an object of the invention to provide an improved optical sighting instrument ... |
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| Method of and device for clamping a workpiece |
| OF THE INVENTION In FIGS. 1, 2 and 3 a device is illustrated for the aligned clamping of a ... |
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| Expansion sleeve for applying precise circumferential stress |
| In the invented expansive sleeve, or bushing, the stress surface, which is comprised in a ... |
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| Method of and apparatus for producing embossing tools |
| I claim: 1. A method of making a large-format surface-texture embossing tool free from pattern-... |
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| Plasma etching using a bilayer mask |
| The present invention provides for high resolution plasma etching of a primary layer on a ... |
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| Method of cleaning a plurality of semiconductor devices |
| OF THE PREFERRED EMBODIMENT Referring now to FIG. 2, there is shown a perforation etch formed ... |
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| Method of forming electrode pattern of semiconductor device |
| It is an object of the present invention to provide a method of forming an electrode pattern having ... |
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| Rapid solidification processing of oxide superconductors |
| What is claimed is: 1. Method for processing a copper-containing superconducting oxide comprising: ... |
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| Formation of superconducting articles by electrodeposition |
| What is claimed is: PG,18 1. A method for forming an oxide superconducting material on an article ... |
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| Method for manufacturing oxide superconducting films by laser evaporation |
| As an exemplified embodiment, a material of the composition Me1-Me2-Cu-O is selected, whereby Me1 ... |
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Material containing microaggregates of metals, inorganic compounds or organometallic compounds, more particularly usable in heterogeneous catalysis and its production process
| Details |
Inventors: Barraud, Andre; Leloup, Jean; Ruaudel, Annie;
Assignee: Commissariat a l'Energie Atomique (Paris, FR)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
The material comprises a membrane constituted either by at least one monomolecular layer of amphiphilic molecules, or by amphiphilic molecules adsorbed on a substrate, and microaggregates of the metal, inorganic compound or organometallic compound retained on or in the membrane. It is prepared from a membrane containing a metal ion or a precursor compound of said metal, inorganic compound or organometallic compound, by reacting the ion or precursor compound fixed in the membrane with at least one reagent for forming the metal, inorganic compound or organometallic compound in situ in the membrane. For example, the membrane can be constituted by monomolecular layers of behenic acid, which is then converted into silver behenate by contacting with a silver nitrate solution. Silver microaggregates are then formed in the membrane by reducing the silver behenate by means of hydrazine. |
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DETAILED DESCRIPTION The present invention relates to a material having microaggregates of metals, organometallic compounds or inorganic compounds, in which said microaggregates have substantially molecular dimensions and are distributed in an ordered manner in a solid matrix and are immobilized by the latter.
The material according to the invention comprises a membrane constituted by either at least one monomolecular layer of amphiphilic molecules, or by amphiphilic molecules adsorbed on a substrate and microaggregates of organometallic or inorganic compounds retained on or in said membrane.
According to an advantageous feature of the invention, the membrane is formed by a stack of monomolecular layers of amphiphilic molecules, e.
g.
acids, such as fatty acids, complexes or complexing agents, such as platinum chlorides complexed with alkyl amines, alkyl pyridines or alkyl pyridinium.
Advantageously, the microaggregates are microaggregates of a metal, e.
g.
a noble metal such as silver, palladium or platinum.
The microaggregates can also be constituted by a metal compound, e.
g.
a halide, oxide or chalcogenide (sulphide, selenide or telluride).
The invention also relates to a process for producing a membrane containing microaggregates of a metal, an inorganic compound or organometallic compound and which comprises the following stages: 1.
preparing a membrane constituted either by at least one monomolecular layer of amphiphilic molecules, or by amphiphilic molecules adsorbed by a substrate containing an ion or a precursor compound of said inorganic compound or organometallic compound; and 2.
reacting the ion or precursor compound fixed to the membrane with at least one reagent to form in situ in the membrane the metal, inorganic compound or organometallic compound.
According to a first embodiment of the process according to the invention, the first stage is performed by firstly preparing a membrane from amphiphilic molecules incorporating groups having a chemical or physical affinity for the ion or precursor compound of said metal inorganic compound or organometallic compound and then by contacting the thus obtained membrane with a solution of the ion or precursor compound, so as to fix the ion or precursor compound to the sites of the membrane corresponding to said groups
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Nonmetallic Processes 
