Porous Media Compositions and Methods for Producing the Same

The present invention relates to porous substrate compositions and methods for producing such compositions. In one embodiment, the porous substrate composition of the present invention comprises sintered spherical particles of a substantially uniform size. The porous media compositions of the present invention comprise relatively randomly-ordered particles with a void fraction significantly higher than compositions with a more ordered, close-packed configuration. The present invention further relates to composite porous media compositions comprising two or more relatively discrete layers of sintered particles. 1. A sintered porous material , comprising:one or more layers of sintered particles having a void fraction of at least about 0.26,wherein each layer comprises substantially spherical particles having a relative standard deviation in particle size of about 10 percent or less.2. The material of claim 1 , wherein the sintered particles comprise:a substantially solid core, andone or more shell layers, wherein each shell layer comprises a plurality of sintered shell particles.3. The material of claim 1 , comprising a first layer and a second layer claim 1 , wherein the second layer comprises substantially spherical particles having a relative standard deviation in particle size of about 10 percent or less claim 1 , and the second layer is sintered to the first layer.4. The material of claim 1 , wherein the average particle size of the particles is greater than about 1 micron.5. The material of claim 1 , wherein the average particle size of the particles is about 1.7 micron.6. The material of claim 1 , wherein the average particle size of the particles is greater than about 3 micron.7. The material of claim 1 , wherein the average particle size of the particles is less than about 500 nm.8. The material of claim 1 , wherein the average particle size of the particles is less than about 250 nm.9. The material of claim 1 , wherein the average particle size of the ...

Porous silica microsphere scavengers

Porous silica microsphere scavengers

Highly purified, porous silica microspheres contain functional groups which are capable of selectively binding to reaction impurities, such as excess reactant or reaction by-products, which are contained in a reaction medium. The reaction impurities can thereby be efficiently removed from the reaction medium, providing a convenient method for product purification.

Porous microparticles solid cores

The present invention relates to microparticles, particularly spherical silica microparticles, which may be useful in liquid chromatography. Specifically, the microparticles include a solid core and an outer porous shell surrounding and irreversibly joined to the core. The shell is composed of a plurality of colloidal nanoparticles, which are applied using an electrostatic multi-multilayering method. The resulting microparticles have a small particle diameter, such as about 1 μ.m to 3.5 μm, a high particle density, such as about 1.2 g/cc to 1.9 g/cc, and a high surface area, such as about 50 m2 /g to 165 m2 /g. These microparticles can be used to form packed beds and liquid chromatographic columns, which are more efficient and rugged than conventional liquid chromatographic columns.