Synthesis, characterization and antibacterial assessment of SiO₂-hydroxypropylmethyl cellulose hybrid materials with embedded silver nanoparticles

Figures & data

Figure 1. Infrared spectra of hybrids derived with different silver content: 0.0 wt% Ag (1), 0.5 wt% Ag (2), 1.5 wt% Ag (3) and 2.5 wt% Ag (4).

Figure 2. XRD patterns of hybrids derived with different silver content: 0.5 wt% Ag (1) and 2.5 wt% Ag (2).

Figure 3. SEM images of hybrids derived with different silver content: 0.0 wt% Ag (a); 0.5 wt% Ag (b); 1.0 wt% Ag (c); 1.5 wt% Ag (d); 2.0 w% Ag (e) and 2.5 wt% Ag (f), at different magnification.

Figure 4. EDS analysis of hybrids derived with different silver content: 0.0 wt% Ag (a), 1.0 wt% Ag (b) and 2.5 wt% Ag (c).

Figure 5. Bacterial growth curves for B. subtilis (a) and E. coli K12 (b) in the presence of hybrids derived with different silver content.

Figure 6. Inhibition zones of B. subtilis (1) and E. coli K12 (2) exposed to pre-coated and dried cover slips with hybrids derived with different silver content: 0.0 wt% Ag (a), 0.5 wt% Ag (b), 1 wt% Ag (c), 1.5 wt% Ag (d) and 2 wt% Ag (e).

Table 1. Size of inhibition zones (mm) surrounding SiO₂/HPMC/Ag hybrids.

SiO2/HPMC/Аg hybrids	0.5 wt%	1.0 wt%	1.5 wt%	2.0 wt%
Microorganism
Bacillus subtilis	3.22 ± 0.18	3.79 ± 0.11	4.13 ± 0.10	4.58 ± 0.16
Escherichia coli K12	1.42 ± 0.2	2.19 ± 0.30	2.55 ± 0.32	2.84 ± 0.30

Note: Data are means of three replicates ± SD (standard deviation).