Creation of Biocidal Coatings using the Stabilization of Silver Nanoparticles in Aqueous Acrylic Dispersions
This article proposes a method for silver nanoparticle (AgNP) stabilization in polymer coatings obtained from aqueous acrylic dispersions. The main objective of the study was to improve the biocidal properties of coatings using AgNPs due to the preservation of their nanoscale state. Two types of...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Universitas Indonesia
2020-01-01
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| Series: | International Journal of Technology |
| Subjects: | |
| Online Access: | http://ijtech.eng.ui.ac.id/article/view/3346 |
| Summary: | This article proposes a method for silver nanoparticle
(AgNP) stabilization in polymer coatings obtained from aqueous acrylic
dispersions. The main objective of
the study was to improve the biocidal properties of coatings using AgNPs due to
the preservation of their nanoscale state. Two types of AgNP solutions with
fundamentally different stabilization mechanisms were synthesized and compared.
Two mechanisms were determined: an aqueous electrostatic mechanism with sodium
docusate stabilizer (AOT) and a steric, propylene glycol with
polyvinylpyrrolidone (PVP) stabilizer. The
results showed that both solutions were unstable and prone to precipitation as
early as the first day after synthesis. However,
the saturation of the propylene glycol AgNP solution with ammonium hydroxide to
pH < 9 allowed the strengthening of the electrostatic factor of aggregative
stability, providing optimal conditions for mixing with acrylic dispersions
stabilized by anionic surfactants. The obtained AgNPs in the acrylic
dispersions stabilized over time, and when they became film-forming, stable
AgNPs (~20–30 nm) occurred on the surface. As a result, the developed coatings
using AgNPs synthesized in propylene glycol in the presence of non-ionic PVP
and modified with ammonium hydroxide, demonstrated a high inactivation of
bacteria colony-forming units (CFU) (> 60%) within 60 min of contact
compared to aqueous AgNP solutions using anionic surfactants as stabilizers,
where the decrease in CFU was around 25%. |
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| ISSN: | 2086-9614 2087-2100 |