Nanosynthesis Techniques of Silica-Coated Nanostructures

Abstract

Core-shell nanomaterials are fast-emerging hybrid nanocomposites in area of nanotechnology, materials science and biochemistry, which are fast attracting research attention. Nanostructured nanomaterials are utilized in wide industry fields such as electronics, biopharmaceutical, biomedicine, optics and biocatalysis. Owing to the additional exterior shell-coating material, the primary core material's functionality, biocompatibility, chemical stability and colloidal dispersibility can be greatly enhanced. Silica, in particular, is found to be an excellent exterior shell-coating material, has been widely researched for the synthesis of core-shell nanocomposite materials. So far, there have been numerous publications devoted to silica-coating techniques using hydrophobic silanes, such as tetraethylorthosilicate (TEOS) or tetramethyl orthosilicate (TMOS), via the classic Stober method. Recently, there has been strong interest in the use of water-soluble silanes such as MPTMS (3-(mercaptopropyl)-trimethoxysilane), MPTES (3-(mercaptopropyl-triethoxysilane), MTMS (3-(methyltrimethoxysilane)) and sodium silicate for water-based silica-coating techniques have gained much attention, due to the fastgrowing need to focus on process simplicity, large-scale fabrication and environmentalfriendly synthesis techniques of silica-based core-shell nanomaterials. Hence, this chapter focuses on the recent development on silica-coating techniques for colloidal nanoparticles, particularly on water-based techniques and morphologies. In summary, we emphasize the importance of advanced nanomaterials in today's world and envisage there will be more breakthrough research on aqueous silica-coating techniques for silica-encapsulated core-shell nanomaterials.

Core@shell structured ceria@mesoporous silica nanoantibiotics restrain bacterial growth in vitro and in vivo

“…In these so-called core@shell designs, mesoporous silica (mSiO 2 ) offers superior advantages as a coating material. The main advantages of silica as shell material lies in its colloidal stability, especially in aqueous media; flexible design options, chemical inertness, controlled porosity, high processability and optical transparency [12]. The chemical inertness of silica can shield the core from degradation and provide multifunctionality.…”

Comparison of the antimicrobial photocatalytic activities of SiO2 and Au@SiO2 nanostructures in water decontamination

“…Low efficiency bacterial removal of SiO 2 nanoparticles in dark condition may be due to the adsorption process. Adsorptive removal of E. coli contamination may be attributed to some characteristics of the SiO 2 nanoparticles, such as high porosity in their large surface area (Ezeuko et al, 2021; Shah, 2018). Another mechanism, such as destruction of the structure of bacteria in interaction with nanoparticles, can also cause their decontamination.…”

“…The mesoporous surface area and pore channel of silica is an excellent candidate for stabilizing and dispersing Au nanoparticles via controlling the particle size and inhibited them aggregation. Also using silica as a supporting nanomaterial, especially in aqueous media has been proved easy controllability of the synthesis, high process ability and optical transparency, and excellent dispersant to provide electrostatically stable colloids (Das et al, 2018, Shah, 2018).…”

A Novel Strategy for Creating an Antibacterial Surface Using a Highly Efficient Electrospray-Based Method for Silica Deposition

“…Silica (SiO 2 ) is non-toxic, highly flexible, and chemically stable and exhibits good biocompatibility and bio-inert properties [ 37 ]. In addition to biocompatibility, silica also displays bioconjugation properties, and silica nanoparticles are commonly introduced as coating materials [ 38 ]. Thus, various approaches have been used in biomedical, diagnostic, and therapeutic applications, particularly for the coating of various medical devices [ 18 , 19 , 39 ].…”