摘要:
The invention relates to a method for the preparation of metallic oxides. The method is carried by controlled hydrolysis of metallic alkoxides using an alkoxide emulsion which contains hydrophobic water/solvent reverse micelles and a surfactant, then submitting the polymer gel obtained to thermal treatment. In order to prepare metallic oxides layers, the reaction product is coated on a support when hydrolysis is only partial.
摘要:
A method for selectively extracted species from an aqueous solution which comprises contacting the aqueous solution with a membrane capable of selectively transporting species from a liquid to another, the membrane comprising a porous polymer support having an average surface pore size less than 100 nm, coated with a continuous layer of a fluorinated polymer obtained by plasma energized chemical vapor deposition (PECVD) using a plasma containing at least one fluorinated compound.
摘要:
Di or polyfunctional macromolecular compounds having a terminal functional group at each end of the molecule are produced by selectively cleaving the carbon-carbon double bonds of an unsaturated polymer by the oxidizing action of a ruthenium tetroxide oxidizing system. The compounds are useful as components in crosslinked plastics materials, in binders for rocket fuels, and as components in tri or polysequential copolymers.
摘要:
The invention concerns a method and a device for the selective extraction of the halide ions from photographic baths. According to the invention, the solutions to be treated are subjected to a first nanofiltration step 2 in diafiltration mode, then to a second nanofiltration step 3 in concentration mode. The method makes it possible to prolong the activity of the fixing or bleaching/fixing baths during the processing of photographic products.