Inorganic Chemistry Communications 159 (2024) 111865
A. Kübra Yontar et al.
Fig. 7. Growth of bacterial colonies images, (A) %1 AgNPs modified MDF surface, (B) %3 AgNPs modified MDF surface, and (C) %5 AgNPs modified MDF surface and (D) antibacterial effect comparisons in logarithmic growth difference (CFU. mL 1 ) graph.
wear resistance decreased. It is thought that this may be due to increased nanoparticle agglomeration and the melamine coating showing higher slip behavior in some regions. It is possible that nanoparticles cannot bond sufficiently with melamine, which may increase the amount of wear on the surface. Scratch resistance was found to be 3 N in all sam ples. In other words, a strength approximately twice the standard value was achieved. The curing times of the coating solutions prepared with nanosilver reinforcement were determined for each ratio. Table 2 shows the curing times of the control and AgNP modified samples after both baths. In the production of coatings, two different baths containing melamine mixture are prepared to ensure that the papers adhere to the surface and to improve the surfaces both aesthetically and mechanically. The time it takes for the polymeric gel layer of the binder mixture on the surfaces immersed in the baths to dry is called gelation time. These gelation times were calculated for each nanoparticle doping ratio. With Table 3 Antibacterial effect comparisons in logarithmic growth difference (CFU. mL 1 ). Bacteria Control A Sample Concentration after incubation (CFU. mL 1 ) Log 10 – reduction
the nano silver particle additive, the curing time after the second bath was shortened by 1 min. Moreover, by increasing the nano silver rate, the time could be shortened by 30 s. In this way, the time spent in production can be shortened and the daily production amount can be increased by applying more MDF surface coatings. Shortening the gelation time was achieved by reducing the amount of water by filling the gaps in the polymeric coating of nano silver particles. As the amount of water that had to evaporate during drying decreased, gelation occurred faster. 3.5. Antibacterial activity of MDF surfaces Fig. 7 (A), (B) and (C) shows the growth amounts of Staphylococcus aureus and Escherichia coli bacteria colonies on agar on nanosilver- added MDF coating surfaces. The lowest growth rate was obtained in
B Sample Concentration after incubation (CFU. mL 1 )
C Sample Concentration after incubation (CFU. mL 1 )
Log 10 – reduction
Log 10 – reduction
5,0 ± 0,2 × 10 4 4,0 ± 0,2 × 10 3
4,2 ± 0,2 × 10 1 6,1 ± 0,5 × 10 1
1,2 ± 0,2 × 10 1 8,1 ± 0,5 × 10 1
5 ± 0,5x10 7 5 ± 0,2 × 10 7
4,09
5,29 3,69
6,69 4,79
E. coli
S .
3
aureus
9
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