One-Pot Synthesis of SiO2@Ag Mesoporous Nanoparticle Coating for Inhibition of Escherichia coli Bacteria on Various Surfaces

Abstract

Silver nanoparticles (Ag NPs) as antibacterial agents are of considerable interest owing to their simplicity, high surface area to volume ratio, and efficient oligodynamic properties. Hence, we investigated the synthesis of silica-supported Ag NPs (SiO2@Ag) as an effective antibacterial agent by using a wet-impregnation method. The formation of SiO2@Ag with Ag NP (5–15 nm diameter) on the silica particle (100–130 nm diameter) was confirmed with transmission electron microscopy (TEM). The study on antibacterial activity was performed in a liquid culture to determine the minimum inhibitory concentration (MIC) against Escherichia coli (E. coli) and Bacillus subtilis (B. subtilis) bacteria. Both bacteria are chosen to understand difference in the effect of Ag NPs against Gram-negative (E. coli) and Gram-positive (B. subtilis) bacteria. SiO2@Ag mesoporous nanoparticles had excellent antibacterial activity against E. coli bacteria and fully restricted the bacterial growth when the material concentration was increased up to 1.00 mg/mL. In addition, the obtained material had good adhesion to both steel and polyethylene substrates and exhibited a high inhibition effect against E. coli bacteria.

Deposition of silver nanoparticles on nanoscroll-supported inorganic solid using incompletely rolled-up kaolinite

“…1B). 38 Meanwhile, the XRD patterns of 0.01Ag-NS-K-C and 0.1Ag-NS-K-C show peaks attributed to Ag metal 39 and a broad profile with kaolinite amorphization; 31,32 the former Ag peaks were more intense than the latter (Fig. 2A).…”

Microwave Irradiation vs. Structural, Physicochemical, and Biological Features of Porous Environmentally Active Silver–Silica Nanocomposites

“…Acharya et al [ 90 ] demonstrated that Ag@SiO 2 core-shell nanoparticles (~17 nm) had a more substantial antibacterial effect on B. subtilis , S. aureus , Serratia marcescens, and K. pneumoniae than singular Ag NPs (~14 nm) due to controlled and sustainable release of Ag(I). Correspondingly, Gankhuyag et al [ 91 ] and Pal et al [ 92 ] recorded an enhanced bactericidal activity of SiO 2 @AgNPs and Ag-NP hybrid silica films against E. coli cells, respectively. A similar effect was reported for the core-shell silver–silica nanosystem against highly resistant Mycobacterium tuberculosis [ 93 ].…”

Antibacterial Activity of In Situ Generated Silver Nanoparticles in Hybrid Silica Films

“…AgNPs have been successfully loaded on various porous supports to enhance the antimicrobial efficiency; Yang et al described E. coli inactivation by AgNPs anchored on titania nanotubes [13], Joarder et al reported enhanced antibacterial activity of AgNPs deposited on MCM-41 type mesoporous silica [14], Guo et al described sustained release behavior of halloysite nanotubes loaded with the AgNPs [15], Dung et al fabricated silver-doped ceramic filter for antimicrobial water purification [16], and Chen et al reviewed the antibacterial activity of silver doped polymeric nanostructures [17]. However, it is necessary to achieve a proper antimicrobial coating that can be applied to a variety of substrates since bare or supported AgNPs could exhibit some adverse effects due to excessive leaching in moist environments that could lead to diminished antibacterial activity and make the environment toxic as well [18][19][20]. Antimicrobial coatings based on AgNPs have been used in medical implants, biomedical devices, and in packaging material to inhibit the bacterial infection [3,[21][22][23][24][25].…”