Reducing ZnO nanoparticles toxicity through silica coating

Reducing ZnO nanoparticles toxicity through silica coating

ZnO NPs have good antimicrobial activity that can be utilized as agents to prevent harmful microorganism growth in food. However, the use of ZnO NPs as food additive is limited by the perceived high toxicity of ZnO NPs in many earlier toxicity studies. In this study, surface modification by silica coating was used to reduce the toxicity of ZnO NPs by significantly reducing the dissolution of th...

Zno nanoparticles/silica for biginelli solution syntheis

Silica coating of nanoparticles by the sonogel process.

A modified aqueous sol-gel route was developed using ultrasonic power for the silica coating of indium tin oxide (ITO) nanoparticles. In this approach, organosilane with an amino functional group was first used to cover the surface of as-received nanoparticles. Subsequent silica coating was initiated and sustained under power ultrasound irradiation in an aqueous mixture of surface-treated parti...

Biocide silver nanoparticles in two different silica-based coating

Silica-based coatings containing biocide silver nanoparticles have been synthesized using low temperature sol-gel method. Two different silane based matrices, phenyltriethoxysilane (PhTEOS) and tetraethyl orthosilicate (TEOS), were selected as precursor to prepare silica-based film. The films were analyzed by using UV–visible spectrophotometry, atomic force microscopy (AFM) and scanning electro...

Lithographically directed deposition of silica nanoparticles using spin coating

Directed self-assembly is an important direction for the extension of patterning to the nanoscale regime and below. Here, examples are given of both individual particle placement and composite structure formation involving assemblies of many nanometer scale particles, both on patterned surfaces and on planar surfaces where the photoresist is used as a sacrificial layer to define the pattern and...