Siliceous materials having tunable porosity and surface morphology and methods of synthesizing same

摘要

Non-spherical siliceous particles having a plurality of porous branches are disclosed and claimed. The porous branches are randomly oriented and elongated, ring-like, and/or aggregated. An additive introduced during synthesis of the particles modifies pore volume and morphology. The tunability of the pore volume includes an inner diameter ranging from about 2 Å to about 50,000 Å. Synthesizing the particles includes mixing under constant or intermittent stirring in a reaction vessel an aqueous silicic acid solution with an acidic heel solution to form a mixture. The stirring may optionally be performed at a variable speed. An additive is introduced into the mixture at a controlled rate, wherein the additive imposes a pH change from a lower pH to a higher pH to the mixture to induce siliceous particle precipitation. Optionally, a metal dopand may be introduced into the particles and/or at least a portion of an outer surface located outside of the pores and/or an inner surface located inside of the pores may be modified.

主权项

1. A method of synthesizing a particle, the method comprising:
(a) mixing under constant or intermittent stifling in a reaction vessel an aqueous silicic acid solution with an acidic solution to form a mixture, said stirring being optionally variable speed; (b) introducing at a controlled rate an additive into the mixture, wherein the additive imposes a confined pH change from a lower pH to a higher pH to the mixture to induce siliceous particle precipitation; (c) optionally introducing a solution containing a salt of a metal into the mixture; and (d) optionally modifying at least a portion of an outer surface located outside of the pores and/or a at least a portion of an inner surface located inside of the pores; thereby creating a particle that is non-spherical and siliceous, the particle further comprising a plurality of branches, each branch being randomly oriented and elongated, ring-like, and/or aggregated; a plurality of pores present in each branch, wherein a subset of the pores are interconnected; a tunable pore volume controlled by an additive introduced during synthesis of said particle; and a pore inner diameter ranging from about 2 Å to about 50,000 Å.