Preparation of silver nanoparticles supported mesoporous silica microspheres with perpendicularly aligned mesopore channels and their antibacterial activities

Abstract

In this study, a facile and effective route for the preparation of silver nanoparticles supported surface mesoporous silica microspheres with perpendicularly aligned mesopore channels and their antibacterial activities were reported. The surface mesoporous silica microspheres (mSiO 2 ) were synthesized by a sol-gel method. The mSiO 2 were then functionalized with 3-aminopropyltriethoxysilane (APTS) to provide amino functional groups for the absorption of Ag + . Silver nanoparticles were directly created on the surface of mSiO 2 by in situ chemical reduction of the Ag precursor using an ultrasonic wave reaction method. The prepared silver nanoparticle supported surface mesoporous silica nanocomposites (mSiO 2 @NH 2 @Ag) were characterized with FT-IR, X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy and high-resolution transmission electron microscopy. Antibacterial activities of the synthesized mSiO 2 @NH 2 @Ag were investigated against Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus aureus (SAU) using the conventional plate-count method.The results demonstrated that the synthesized nanocomposites exhibited excellent antibacterial properties against E. coli and SAU. Furthermore, because of the slow release property of silver, the synthesized nanocomposites can be used as an economic recyclable material in various antibacterial applications, such as water purification systems and environmental control of bacteria.

In-situ reduction of monodisperse nanosilver on hierarchical wrinkled mesoporous silica with radial pore channels and its antibacterial performance

“…The MIC of S. aureus was slightly higher than E. coli, which could be ascribed to its thicker cell wall, thus higher dose of the antibacterial agent was necessary to inhibit the growth of bacterial. So far as we have been concerned, the obtained effective inhibition concentration was much lower than a majority of mesoporous silica-supported Ag nanoparticles (typical 100-1000 mg/L) [58][59][60][61] and slightly lower than the result reported by Jiang and his coworkers [47]. According to the ICP-AES measurement, the weight content of Ag NPs in AgNPs@ WMSs-SO 3 − was 8.32%, thus the actual concentration of Ag NPs worked in the MIC can be calculated and the results were recorded in Table 2.…”

Mesoporous Silica‐Based Materials with Bactericidal Properties

“…Fu and co‐workers prepared MS NPs functionalized with AgNPs and tested their antibacterial behavior against E. coli and S. aureus . The final material was prepared from MS particles of ≈130 nm that were coated with a mesoporous shell containing aminopropyl moieties.…”

Coated silver nanoparticles: synthesis, cytotoxicity, and optical properties

“…Aerwards, various amounts of AgNO 3 were added to the solution. 41 Solutions with lower Ag concentrations require several hours to be ready for coating, while solutions with higher Ag concentrations need a shorter time. 42 Fig.…”