Recent Advances in Silver Nanoparticles Containing Nanofibers for Chronic Wound Management

Infections are the primary cause of death from burns and diabetic wounds. The clinical difficulty of treating wound infections with conventional antibiotics has progressively increased and reached a critical level, necessitating a paradigm change for enhanced chronic wound care. The most prevalent bacterium linked with these infections is Staphylococcus aureus, and the advent of community-associated methicillin-resistant Staphylococcus aureus has posed a substantial therapeutic challenge. Most existing wound dressings are ineffective and suffer from constraints such as insufficient antibacterial activity, toxicity, failure to supply enough moisture to the wound, and poor mechanical performance. Using ineffective wound dressings might prolong the healing process of a wound. To meet this requirement, nanoscale scaffolds with their desirable qualities, which include the potential to distribute bioactive agents, a large surface area, enhanced mechanical capabilities, the ability to imitate the extracellular matrix (ECM), and high porosity, have attracted considerable interest. The incorporation of nanoparticles into nanofiber scaffolds constitutes a novel approach to “nanoparticle dressing” that has acquired significant popularity for wound healing. Due to their remarkable antibacterial capabilities, silver nanoparticles are attractive materials for wound healing. This review focuses on the therapeutic applications of nanofiber wound dressings containing Ag-NPs and their potential to revolutionize wound healing.

Synthetic incorporation of palladium-nickel bimetallic nanoparticles within mesoporous silica/silica nanoparticles as efficient and cheaper catalyst for both cationic and anionic dyes degradation

Nickel-palladium bimetallic nanocrystallite supported mesoporous silica/silica nanoparticles (MSPs/MSNPs) made at a controlled ratio of Pd/Ni via organotrialkoxysilane mediated reduction of palladium cations are reported. The organotrialkoxysilane serve as a template for the stabilization and formation of bimetallic Pd-Ni nanocrystallite within MSPs/MSNPs that are characterized by TEM, EDX, HR-SEM, HR-MS, XRD, BET and Elemental mapping analysis, kinetic analysis for degradation of both cationic and anionic dyes, i.e., rhodamine B and congo red, respectively. The nanocrystallite inserted MSNPs of particle diameter 200 nm justify faster degradation with rate constant to the order of 6.9 x10^-2s^-1 as compared to that for MSPs of 50 µm to the order of 3.2 x10^-2 s^-1 for 15 ppm Rh B within 50 s as compared to that for mesoporous silica of 50 µm within 110 s under similar conditions with analogous observation for the degradation of congo red. Heterogeneous support is fully recyclable and shows 100% catalytic activity even after five subsequent applications. The degradation dynamics have further been evaluated based on fluorescent spectra and HR-MS analysis.

One-pot preparation of poly(styrene-co-divinylbenzene)/silver nanoparticles composite microspheres with tunable porosity and their catalytic degradation of methylene blue in aqueous solution

Porous poly(styrene-co-divinylbenzene)/silver nanoparticle composite spheres with tunable porosity were synthesized by seed swelling polymerization method and show a great catalytic degradation of methylene blue within NaBH₄.