Abstract:
La présente invention concerne un procédé de préparation de silice précipitée comprenant la réaction d'un silicate avec un agent acidifiant pour obtenir une suspension de silice précipitée, suivie d'une étape de séparation pour obtenir un gâteau et d'une étape de séchage dudit gâteau, procédé dans lequel une étape de compactage dudit gâteau à une pression supérieure à 10 bars est effectuée entre l'étape de séparation et l'étape de séchage.
Abstract:
The present invention provides a process for making regular shaped particles of solid foam. A first mixture, comprising water, an acid, a surfactant and a hydrophobic material, is combined with a hydrolysable silicon species to form a second mixture. The second mixture is maintained under conditions and for a sufficient time to form regular shaped precursor particles. The second mixture is then aged at a temperature and for a time effective to produce the regular shaped particles of solid foam.
Abstract:
A method for the preparation of new porous inorganic microsphere compositions possessing uniform mesopores in the range of about 200 to 450 nm. An improved process for preparing silica microspheres, and their use in synthesizing mesoporous inorganic materials. These microspheres and mesoporous materials have many applications, such as for catalyst supports, advanced ceramics, and adsorbents.
Abstract:
L'invention concerne des particules poreuses de silice de dimension submicronique, ainsi qu'un procédé pour leur préparation. Les particules sont sensiblement sphériques et elles ont une dimension entre 100 nm et 900 nm et une surface spécifique supérieure à 500 m 2 .g -1 . Elles sont caractérisées en ce qu'elles présentent d'une part une porosité constituée par un réseau de pores ayant un diamètre entre 8 et 10 nm organisés de manière périodique selon une symétrie hexagonale, et d'autre part une porosité constituée par des cavités ayant une dimension de plusieurs dizaines de nm. Les particules sont utiles comme milieu de séparation ou comme support solide de molécules catalytiques.
Abstract:
A process for preparing a mesoporous metal oxide, i.e., transition metal oxide, Lanthanide metal oxide, a post-transition metal oxide and metalloid oxide. The process comprises providing a micellar solution comprising a metal precursor, an interface modifier, a hydrotropic ion precursor, and a surfactant; and beating the micellar solution at a temperature and for a period of time sufficient to form the mesoporous metal oxide. A mesoporous metal oxide prepared by the above process. A method of controlling nano-sized wall crystallinity and mesoporosity in mesoporous metal oxides. The method comprises providing a micellar solution comprising a metal precursor, an interface modifier, a hydrotropic ion precursor, and a surfactant; and heating the micellar solution at a temperature and for a period of time sufficient to control nano-sized wall crystallinity and mesoporosity in the mesoporous metal oxides. Mesoporous metal oxides and a method of tuning structural properties of mesoporous metal oxides.
Abstract:
Disclosed herein are a method for synthesizing one-dimensional helical mesoporous structure, in which a self-assembled structure of a glycine-derived surfactant is used as a template at room temperature to synthesize the one-dimensional helical mesoporous silica structures having a uniform pore size and a method for synthesizing a glycine-derived surfactant for synthesizing the helical nanoporous structures, in which relatively expensive surfactant can be easily recovered using an organic solvent and reused, which provides economical and environment friendly effects and the glycine-derived surfactant is synthesized by homogeneously heating a reaction product of glycine and phthalic anhydride by dielectric heating with irradiation of microwave, whereby it is possible to realize high yield of the glycine-derived surfactant, shortened synthesis time and increase in energy efficiency, leading to improvement in productivity and reduction in production cost.
Abstract:
The present invention relates to an apparatus and a method for manufacturing amorphous nanoporous silica enabling mixing of source materials with accurate equivalence ratio by generating an eddy current using high-speed reaction nozzles and capable of controlling physical properties using a continuous circulation polymerizer which performs high-speed stirring and low-speed stirring and amorphous nanoporous silica prepared by the method, which has a BET surface area of 100-850 m /g, a pore size of 2-100 nm and a pore volume of 0.2-2.5 mL/g.
Abstract:
Embolization, as well as related particles, compositions and methods are disclosed. The particles are substantially spherical porous silica particles having a diameter of from about 100 µm to about 3000 µm.
Abstract:
The present invention relates to a method for the fabrication of a porous silica sphere, wherein silica gel is treated with heat for a designated time by increasing its temperature at the speed of 90 °C per minute up to 1050 to 1200 °C to fabricate a porous silica sphere. The present invention can fabricate a porous silica sphere that has a homogeneous structure and pore size at a low cost, using commercial silica gel that is sold for various purposes such as food preservation and humidity control, as a raw material.
Abstract:
This invention relates to porous organosilica nanoparticles having a BET surface area of at least 400m 2 /g and/or a pore volume of at least 0.7cm 3 /g, wherein the nanoparticles have a mean pore diameter of l-50nm, a mean diameter in the range 1-100nm and wherein the pores of the nanoparticles are randomly oriented. This invention also relates to solutions, dispersions, powders, compressed pellets and coatings comprising a plurality of the porous organosilica nanoparticles, as well as to methods for preparing the porous organosilica nanoparticles.