A direct surface silyl modification of acid-synthesized mesoporous silica

Abstract

A surface silyl modiÐcation and surfactant removal of acidsynthesized mesoporous silica process in a single step is investigated ; the surfactant-silyl exchange process allows a large amount of surface attachments of silane.

Gold Nanoparticles Confined in Vertically Aligned Silica Nanochannels and Their Electrocatalytic Activity Toward Ascorbic Acid

“…22c, 23 TEM images (Figure 2 a,b) show that the structure of AuNP‐APTS‐MSF was intact, and no aggregation exists among AuNPs. The diameter of silica mesochannels was about 2–3 nm; after the surface modification by amino groups, the shrinkage of pore size is about 1.0 nm 19. Therefore AuNPs should have a size of 1–2 nm in average, and this is consistent with the estimated size distribution (inset in Figure 2 a).…”

“…The diameter of silica mesochannels was about 2-3 nm; after the surface modification by amino groups, the shrinkage of pore size is about 1.0 nm. [19] Therefore AuNPs should have a size of 1-2 nm in average, and this is consistent with the estimated size distribution (inset in Figure 2 a). Larger AuNPs with a size in the range of 2.0-2.5 nm may be formed on the top surface of MSF.The UV/Vis spectrum of AuNPs confined in APTS-MSF are given in the Supporting Information, Figure S3.…”

“…Prior to deposition, the surface of MSF was functioned with (3‐aminopropyl)triethoxy silane (APTS) 7b. 19 Consequently, the strong electrostatic/neutralization interaction between NH 3 + moieties and [AuCl 4 ] − results in a well confinement of AuNPs into the nanochannels after chemical reduction (Scheme ). As‐prepared AuNPs in APTS‐MSF are highly dispersed with a narrow size distribution.…”

Mesoporous Silica Nanoparticles: Their Projection in Nanomedicine

“…One of the major issues of postsynthesis method is the possible blocking of the mesopore openings by the functional groups, which would lead unavoidably to heterogeneous functionalization of the mesoporous matrix [76]. Last, the surfactant displacement method consists in the direct surface silylation with simultaneous surfactant removal by using acidic alcohol as solvent [77,78]. This method produces homogeneous monolayer coating, where the amount of functional groups on the mesoporous silica surface can be precisely tuned.…”

On the Confinement Effect During Catalytic Reaction Over Al-MCM-41

“…1,000 m 2 /g), high hydrocarbon sorption capacities ([0.7 mL/g), and high thermal and hydrothermal stabilities. Furthermore, their pore surfaces can be easily functionalized for tailored purposes [7,8]. As such, these unique properties render their applications in a wide range of areas, for example, as in sorption/separation processes [9], electronic/optical materials [10], and catalytic reactions [11].…”