Antiviral Properties against SARS-CoV-2 of Nanostructured ZnO Obtained by Green Combustion Synthesis and Coated in Waterborne Acrylic Coatings

Abstract

The COVID-19 pandemic has increased the need for developing disinfectant surfaces as well as reducing the spread of infections on contaminated surfaces and the contamination risk from the fomite route. The present work reports on the antiviral activity of coatings containing ZnO particles obtained by two simple synthesis routes using Aloe vera (ZnO-aloe) or cassava starch (ZnO-starch) as reaction fuel. After detailed characterization using XRD and NEXAFS, the obtained ZnO particles were dispersed in a proportion of 10% with two different waterborne acrylic coatings (binder and commercial white paint) and brushed on the surface of polycarbonates (PC). The cured ZnO/coatings were characterized by scanning electron microscopes (SEM) and energy-dispersive X-ray spectroscopy (EDS). Wettability tests were performed. The virucidal activity of the ZnO particles dispersed in the waterborne acrylic coating was compared to a reference control sample (PC plates). According to RT-PCR results, the ZnO-aloe/coating displays the highest outcome for antiviral activity against SARS-CoV-2 using the acrylic binder, inactivating >99% of the virus after 24 h of contact relative to reference control.

Synthesis of Blue Gahnite (ZnAl2O4:Co, Nd): A Cost-Effective Method for Producing Solar-Reflective Pigments for Cool Coatings

“…The Near Infrared spectra were also obtained for the pigments applied in waterborne acrylic paint to evaluate the performance of the pigments in a coating ( Figure 7 ). The commercial paint used in this study contains the white pigment titanium dioxide, as observed in our previous work [ 35 ], which can influence the NIR reflectance of the surface coatings due to its high solar reflectivity [ 5 ]. The NIR solar reflectance curves of the coatings were calculated by ASTM standard G173-03 ( Figure 7 b).…”

Enhanced Biocidal Activity of Heterophase Zinc Oxide/Silver Nanoparticles Contained within Painted Surfaces

“…The results obtained of the authors in [59] provide evidence that paint layers containing galvanic microcells of zinc and copper with a total copper surface area of 4.4% display virucidal activity according to ISO 21702 standard with human coronavirus NL63 as a model organism. In [60], antimicrobial coatings were developed from pure ZnO particles that reduce the infectivity of SARS-CoV-2 suspensions by >99.9% in 1 h. The study in [61] evaluates the high virucidal activity of acrylic paint surfaces painted with nanostructured ZnO-aloe pigments with a 10 wt.%. ZnO mass ratio against SARS-CoV-2.…”