Prompt and synergistic antibacterial activity of silver nanoparticle-decorated silica hybrid particles on air filtration

Abstract

Silver nanoparticle-decorated silica hybrid particles (AgNP@SiO2) bite away bacteria promptly and synergistically upon contact by air filtration.

Redox Properties on the Surfaces of Silica Networks Encapsulating Clusters of Superparamagnetic Magnetite Nanoparticles

“…It is well known that the Ag + ion makes a complex with ammonia in NH 4 OH solution and that the resulting [Ag(NH 3 ) 2 ] + complex can be reduced to Ag 0 by formaldehyde and grow to produce AgNPs under milder conditions than can be used for the Ag + ion itself, in a controllable way due to the lowered standard reduction potential {+0.38 V for [Ag(NH 3 ) 2 ] + vs. +0.80 V for Ag + } . Thus, for the reductive decoration of [Ag(NH 3 ) 2 ] + complexes to AgNPs on the S N series, the reported method with a seeding, sorting‐out, and growing process was applied as shown in Scheme . Controlled reduction of [Ag(NH 3 ) 2 ] + complexes to Ag 0 on the remaining Ag seeds after the sorting‐out process is a key factor for the successful synthesis of AgNPs@S N series.…”

“…The resultant Ag seeds@S N series were collected with the aid of a magnet and dispersed in deionized water (DW). For sorting out of Ag seeds, the Ag seeds@S N solution was poured into an aqueous ammonia solution containing AgNO 3 and the mixture was stirred for the time listed in the Exp. Section.…”

“…Generally, a larger‐scale synthesis needed a longer stirring time to afford the same population of Ag seeds on S N with the other conditions fixed, whereas a longer stirring time yielded a smaller population of Ag seeds on S N with the synthesis scale fixed. It has been suggested that, during stirring, relatively larger seeds are displaced from the S N , due to their higher mass and centrifugal force, with relatively weak interaction with AP moieties . In Scheme , AP moieties connecting S N and Ag seeds are omitted to improve clarity.…”

Glutathione-triggered luminescent silver nanoparticle: A urinary clearable nanoparticle for potential clinical practice

“…21 Silver NPs (AgNPs) are popularly employed in the biomedical products due to their AgNPs leads to even broader biological applications of AgNPs, such as fluorescence 1 labeling, probe tracking, and biological imaging [26][27]. While the awareness in using 2 AgNPs-containing materials is continuously growing, little information on the potential in 3 vivo risks of AgNPs is accessible [28][29]. In contrast to the molecular agents, AgNPs 4 generally causes severe accumulation in reticuloendothelial system (RES, i.e., liver and 5 spleen), resulting in hepatic and splenic injuries [30].…”

Enhanced Antimicrobial Activity on Non-Conducting and Conducting Air Filters by Using Air Ions and Grapefruit Seed Extract

“…Silver nitrate (AgNO 3 ) (Miaśkiewicz-Peska et al, 2011), silver nanoparticles (Joe et al, 2013;Joe et al 2016), silver nanoparticle-decorated silica (Ko et al, 2014), and natural products such as Sophora flavescens extract (Jung et al, 2011), grapefruit seed extract (GSE) Woo et al, 2015), propolis , shiitake extract , and tea tree and eucalyptus oils (Pyankov et al, 2012) have been used on filter surfaces for their microbe-inactivating abilities.…”