Effects of Precipitation and Drying Processes on the Synthesis of Silica Materials with a Large-Pore-Volume and Narrow-Pore-Diameter Distribution

Abstract

In this paper, a novel process using the combination of a microreactor and a stirred-tank reactor for the controlled preparation of silica materials with a large-pore-volume and narrow-pore-diameter distribution was presented. At the precipitation stage, the gelation time was controlled to within 50 ms by improving the mixing performance in the microreactor. After further mixing and acidizing in a stirred-tank reactor, silica with a pore volume of 1.96 mL/g and a specific surface area of 476.1 m2/g was prepared. The primary particle size was 10 nm, and the variance of the logarithmic pore diameter was approximately 0.20, which indicated that the pore-diameter distribution was narrow and uniform particles were in favor of accumulating uniform pores. At the drying stage, with the addition of poly­(vinyl alcohol) to a silica slurry, the process conditions were optimized, and silica with a larger pore volume of 2.13 mL/g was prepared.

Colloidal Silica Particle Synthesis and Future Industrial Manufacturing Pathways: A Review

“…The production of precipitated amine-functionalized porous silica (or silica composite) colloids has proven highly successful at promoting a regenerative CO 2 adsorbing product with a high absorption capacity for potential for use in carbon capture technology. ,, Quang et al had also utilized the amine-functionalized precipitated silicas to attract a silver coating allowing for the manufacture of silica–silver core–shell nanocomposites for catalysis and antibacterial applications. Further improvement of the control over pore size and size distribution of precipitated silica during the synthesis and drying stages has also been studied in recent years …”

“…Further improvement of the control over pore size and size distribution of precipitated silica during the synthesis and drying stages has also been studied in recent years. 134 The precipitated silica method is highly cost-effective and with continued improvements has even approached the purity obtained by the fumed silica synthesis route. However, ultimately methods that offer greater control over the product properties and milder reaction conditions are likely to eventually supersede the current industrial monopoly enjoyed by the precipitated silica synthesis method.…”

Chemical and Structural Comparison of Different Commercial Food Supplements for Silicon Uptake

“…The 29 Si single-pulse (SP) MAS NMR spectra were recorded on an Avance III HD Ascend 400WB spectrometer (Bruker Corporation, Billerica, MA, USA) using a ZrO 2 rotor (4 mm outer diameter). Samples were recorded at a rotational frequency of 13 kHz and a resonant frequency of 79.53 MHz.…”

“…The measurements were performed with a relaxation time of 20 s and a scan count of 3000-4000 scans. Blank measurements were subtracted from all 29 Si SP MAS NMR spectra because there was a light background (sample head) in each measurement. The 29 Si SP MAS NMR blank measurement was performed with aluminum oxide as the filler.…”

“…Blank measurements were subtracted from all 29 Si SP MAS NMR spectra because there was a light background (sample head) in each measurement. The 29 Si SP MAS NMR blank measurement was performed with aluminum oxide as the filler. The liquid NMR spectra were obtained using a Bruker Avance III 400 MHz spectrometer at 79.49 MHz for 29 Si NMR.…”