Synthesis of mesoporous silica shapes using sodium silicate as a silica source
AssigneeClarkson University
InventorsIgor Sokolov, Sajo P. Naik
Life of this patent
Estimating the term…
Abstract
This invention describes the self-assembly of meso(nano)porous silica particles from inorganic an inexpensive silica precursor, sodium silicate. The particles have a well defined shape, high surface area, and high uniformity of the pore size, the properties that are typically found for high quality mesoporous material synthesized from organic silica precursors. The disclosure illustrates a synthesis of hard spheres, discoids, and a mixture comprising discoids, gyroids and fibers, termed as origami.
Claims33
A method for preparation of nanoporous silica particles, having a self-sealed property, comprising either nanoporous silica spheres, nanoporous silica discoids, or a mixture of nanoporous silica spheres and nanoporous silica discoids, the method comprising the steps of:
- combining sodium silicate, an aqueous solvent, an acidic catalyst, and a structure directed agent (SDA) into a precursor solution;
- and
- forming said nanoporous silica spheres and/or nanoporous silica discoids via a molecular self-assembly process, wherein each particle is formed by a plurality of hexagonally organized pore channels running along the circumference of the particle axis forming the shape of the particle, wherein the ends of these hexagonally organized pore channels join together, such that the nanoporous particles are self-sealed, the process comprising the step of incubating said precursor solution at a predetermined temperature for a predetermined amount of time in order to obtain said self-sealed nanoporous spheres and/or discoids;
- and
- collecting said nanoporous silica spheres and/or discoids using gravitational precipitation, centrifugation, filtration, dialysis, and/or a combination thereof.
A method of preparation of nanoporous silica particles, having a self-sealed property, formed as nanoporous silica spheres and/or nanoporous silica discoids, the method comprising the steps of:
- combining an inorganic silica precursor, sodium silicate, an aqueous solvent, an acidic catalyst mixed with formamide, and a structure directed agent (SDA) into a precursor solution;
- and
- forming said nanoporous silica spheres and/or nanoporous silica discoids via a molecular self-assembly process, wherein each particle is formed by a plurality of hexagonally organized pore channels running along the circumference of the particle axis forming the shape of the particle, wherein the ends of these hexagonally organized pore channels join together, such that the nanoporous particles are self-sealed, the process comprising the step of incubating said precursor solution at a predetermined temperature;
- and
- collecting said nanoporous silica spheres and/or discoids using gravitational precipitation, centrifugation, filtration, dialysis, and/or a combination thereof.
A method of synthesizing nanoporous silica spheres and discoids, having a self-sealed property, the method comprising the steps of:
- combining, into a precursor solution, an inorganic silica precursor, disodium trioxosilicate (Na2SiO3.9H2O) as a silica source, an aqueous solvent, cetyltrimethylammonium chloride or bromide as a structure directed agent (SDA), and hydrochloric acid as a catalyst, wherein the molar sol composition of the precursor solution is 1Na2SiO3.9H2O:
- 0.5-3CTAC:
- 10-70HCl:
- 600-800H2O;
- and
- forming said nanoporous silica spheres and discoids via a molecular self-assembly process, wherein each particle is formed by a plurality of hexagonally organized pore channels running along the circumference of the particle axis forming the shape of the particle, wherein the ends of these hexagonally organized pore channels join together, such that the nanoporous particles are self-sealed, the process comprising the step of incubating said precursor solution at a predetermined temperature;
- and
- collecting said nanoporous silica spheres and discoids using gravitational precipitation, centrifugation, filtration, dialysis, and/or a combination thereof.
A method of synthesizing mesoporous silica particles, having a self-sealed property, the method comprising the steps of:
- combining, into a precursor solution, an inorganic silica precursor, disodium trioxosilicate (Na2SiO3.9H2O) as an silica source, an aqueous solvent, cetyltrimethylammonium chloride or bromide as a structure directed agent (SDA), and hydrochloric acid as a catalyst, wherein said precursor solution may optionally comprise formamide;
- and
- forming said mesoporous silica particles via a molecular self-assembly process, wherein each particle is formed by a plurality of hexagonally organized pore channels running along the circumference of the particle axis forming the shape of the particle, wherein the ends of these hexagonally organized pore channels join together, such that the nanoporous particles are self-sealed, the process comprising the step of incubating said precursor solution at a predetermined temperature;
- and
- collecting said nanoporous silica particles using gravitational precipitation, centrifugation, filtration, dialysis, and/or a combination thereof.
Dependencies are inferred from the claim text.