Ag-lignin hybrid nanoparticles for high-performance solar absorption in photothermal antibacterial chitosan films

Liu, Jinrong,1995-Stockholms universitet,Institutionen för material- och miljökemi (MMK) (författare)

There is an urgent need for antimicrobial films based on sustainable resources and production methods. In this study, we present a bio-based nanocomposite film composed of chitosan (∼60 wt %), lignin nanoparticles (LNPs, ∼40 wt %), a small amount of glutaraldehyde (1.5 wt %), and a trace level of silver nanoparticles (AgNPs, 0.072 wt %). The uniform dispersion with LNPs prevented aggregation of metallic silver, resulting in small (diameter 3.3 nm) AgNPs. The nanocomposite film absorbs 89% of radiation across the entire solar spectrum and exhibits a remarkable photothermally triggered antibacterial effect, which is further enhanced by the dark color of lignin. Under simulated solar light illumination, the nanocomposite films demonstrated a significant reduction in viable Escherichia coli count compared to control scenarios. The potential applications of these nanocomposites extend to sunlight-activated antimicrobial films and coatings, addressing the growing demand for sustainable and effective antimicrobial materials.

Sipponen, Mika H.,1983-Stockholms universitet,Institutionen för material- och miljökemi (MMK)(Swepub:su)misi6261 (författare)
Stockholms universitetInstitutionen för material- och miljökemi (MMK) (creator_code:org_t)

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