摘要:
A process for preparing a composition including synthetic mineral particles, in which a hydrogel which is a precursor of the synthetic mineral particles is prepared via a coprecipitation reaction between at least one compound including silicon, and at least one compound including at least one metal element, characterized in that the coprecipitation reaction takes place in the presence of at least one carboxylate salt of formula R2—COOM′ in which: —M′ denotes a metal chosen from the group made up of Na and K, and —R2 is chosen from H and alkyl groups including fewer than 5 carbon atoms. A composition including synthetic mineral particles which is obtained by such a process is also described.
摘要:
A method for preparing a composition including synthetic mineral particles, in which: a hydrogel that is a precursor of the synthetic mineral particles is prepared, and the hydrogel is subjected to a hydrothermal treatment, characterized in that at least one step of the hydrothermal treatment is carried out with the addition of at least one carboxylate salt to the treatment medium, the carboxylate salt having the formula R—COOM′, where M′ denotes a metal selected from the group consisting of Na and K, and R is selected from H and the alkyl groups that include fewer than 10 carbon atoms.
摘要:
A method for preparing a novel hydrogel including silico-metallic mineral particles of the formula (Six(Si-A)1-x)4M3O11.n′H2O, in which: x is a real number in the range [0.75; 1], A denotes a group selected from methyl and hydrocarbon groups including at least one heteroatom, and M is a metal selected from the group consisting of magnesium, cobalt, zinc, copper, manganese, iron, nickel and chromium, wherein a coprecipitation reaction is carried out in an aqueous medium between: at least one metal salt of the metal M, sodium metasilicate, Na2OSiO2, and at least one water-soluble oxysilane of formula (I): in which R1, R2 and R3 are selected from hydrogen and linear alkyl groups including 1 to 3 carbon atoms.
摘要:
A method for preparing a novel hydrogel including silico-metallic mineral particles of the formula (Six(Si-A)1−x)4M3O11.n′H2O, in which: x is a real number in the range [0.75; 1], A denotes a group selected from methyl and hydrocarbon groups including at least one heteroatom, and M is a metal selected from the group consisting of magnesium, cobalt, zinc, copper, manganese, iron, nickel and chromium, wherein a coprecipitation reaction is carried out in an aqueous medium between: at least one metal salt of the metal M, sodium metasilicate, Na2OSiO2, and at least one water-soluble oxysilane of formula (I): in which R1, R2 and R3 are selected from hydrogen and linear alkyl groups including 1 to 3 carbon atoms.
摘要:
A process for preparing a composition including synthetic mineral particles, in which a hydrogel which is a precursor of the synthetic mineral particles is prepared via a coprecipitation reaction between at least one compound including silicon, and at least one compound including at least one metal element, characterized in that the coprecipitation reaction takes place in the presence of at least one carboxylate salt of formula R2—COOM′ in which: —M′ denotes a metal chosen from the group made up of Na and K, and —R2 is chosen from H and alkyl groups including fewer than 5 carbon atoms. A composition including synthetic mineral particles which is obtained by such a process is also described.
摘要:
A method for preparing a composition including synthetic mineral particles, in which: a hydrogel that is a precursor of the synthetic mineral particles is prepared, and the hydrogel is subjected to a hydrothermal treatment, characterized in that at least one step of the hydrothermal treatment is carried out with the addition of at least one carboxylate salt to the treatment medium, the carboxylate salt having the formula R—COOM′, where M′ denotes a metal selected from the group consisting of Na and K, and R is selected from H and the alkyl groups that include fewer than 10 carbon atoms.
摘要:
The invention concerns compounds called pyrene-cholesterols, of general formula (I), wherein: X represents a CH2 group or an oxygen atom and n is an integer from 2 to 10, as well as their use for implementing a method for detecting and measuring the effects of specific products on biological membranes, and a method for preparing the compounds.
摘要:
A subject-matter of the present invention is a process for the sulfonation of an activated or deactivated aromatic compound. The invention applies to the preparation of aromatic sulfones. The process for the sulfonation of an aromatic compound according to the invention comprises the reaction of said aromatic compound with a sulfonating agent, in particular an aryl or alkyl sulfonating agent, in the presence of a catalytically effective amount of a mixture of a bismuth trihalide and of perfluoroalkanesulfonic acid.