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Saturday, 20 April 2019
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Raw materials & technologies, Technologies

Functionalised zirconia compounds as antifungal additives for hygienic water-borne coatings

Wednesday, 23 January 2019

In a recently published work, the sol-gel method was used to obtain materials based on silica and zirconia, with the inclusion of silver (Ag).

The addition of silver (Ag) into the chemical synthesis of materials, transform them into materials technologically relevant to be used as antimicrobial additives. Source: Geizkragen69 / Pixabay.
The addition of silver (Ag) into the chemical synthesis of materials, transform them into materials technologically relevant to be used as antimicr...

The solids were characterised by potentiometric titration, specific surface area (SBET), X-Ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) and, the antifungal activity of the additives was assessed by agar plate inhibition against Chaetomium globosum and Alternaria alternata. In addition, the resistance to fungal growth on water-borne coatings was evaluated after the incorporation of the solids into paint formulation.

Improvement of antifungal activity

Amorphous materials with different acidic and textural properties were obtained. Most of the tested solids showed antifungal activity at the highest concentration used, and the presence of Ag increased the percentage of inhibition. The mixed oxides Ag-additives improved the antifungal activity compare with the pure Ag-oxides (silica or zirconia). In this sense, a synergic effect between zirconia/silica and silver would be a promising result that would reduce the amount of silver in these bioactive materials. The work was performed as a preliminary study, in order to guide the selection of a suitable additive from a list of possible antifungal agents.

The study is published in: Progress in Organic Coatings Volume 128, March 2019, Pages 1-10.

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