Abstract
An automatic lab-scaled spray-coating machine was used to deposit Ag nanoparticles (AgNPs) on textile to create antibacterial fabric. The spray process was monitored for the dual purpose of (1) optimizing the process by maximizing silver deposition and minimizing fluid waste, thereby reducing suspension consumption and (2) assessing AgNPs release. Monitoring measurements were carried out at two locations: inside and outside the spray chamber (far field). We calculated the deposition efficiency (E), finding it to be enhanced by increasing the spray pressure from 1 to 1.5 bar, but to be lowered when the number of operating sprays was increased, demonstrating the multiple spray system to be less efficient than a single spray. Far-field AgNPs emission showed a particle concentration increase of less than 10% as compared to the background level. This finding suggests that under our experimental conditions, our spray-coating process is not a critical source of worker exposure.
Highlights
IntroductionSpray-coating techniques are widely used in a range of industrial fields, from graphic art applications to coatings and painting
Monitoring measurements were performed during a spray-coating process with an aqueous suspension of Ag nanoparticles (AgNPs) as feed
The aqueous Ag-HEC nanosuspension, produced at ISTEC-CNR (Faenza (RA), Italy), at a concentration of 0.05% w/w with the addition of polyvinyl alcohol (PVA) to increase adhesion to the substrate, was sprayed on polyester textile provided by MICA NanoTech Ltd. (Limerick, Ireland)
Summary
Spray-coating techniques are widely used in a range of industrial fields, from graphic art applications to coatings and painting. Providing excellent coating on a variety of different shaped surfaces, these techniques are frequently part of in-line production systems. Advantages include minimum fluid waste, easy film thickness and roughness control, and the use of a broad spectrum of different viscosity fluids for a wide range of different coating requirements. In-depth study of the deposition technique can lead to process optimization, i.e., maximizing the material deposited and minimizing dispersal. The technique adopted in this study has considerable scalable promise. The simple operational process and design of the computer-controlled spray coaters would facilitate the transition to a full-fledged industrial process [1]. Lung-Deposited Surface Area Concentration Measurements in Selected Occupational and Non-Occupational Environments.
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