Antibacterial thermoplastic polyurethane electrospun fiber mats prepared by 3-aminopropyltriethoxysilane-assisted adsorption of Ag nanoparticles

Abstract

Antibacterial thermoplastic polyurethane (TPU) electrospun fiber mats were prepared by adsorption of Ag nanoparticles (Ag NPs) onto TPU/3-aminopropyltriethoxysilane (APS) co-electrospun fiber mats from silver sol. The use of APS can functionalize TPU fibers with amino groups, facilitating the adsorption of Ag NPs. The effects of pH of silver sol and APS content on Ag NP adsorption and antibacterial activity were investigated. Ag NP adsorption was evidenced by TEM, XPS and TGA. Significant Ag NP adsorption occurred at pH = 3−5. The main driving force for Ag NP adsorption is electrostatic interaction between -NH3 + of the fibers and -COO − derived from the -COOH group capped on the surfaces of Ag NPs. The antibacterial activity of the Ag NP-decorated TPU/APS fiber mats was investigated using both gram-negative Escherichia coli and gram-positive Bacillus subtilis. The antibacterial rate increases with increasing APS content up to 5% where the antibacterial rates against both types of bacteria are over 99.9%.

Desert Beetle-Inspired Superhydrophilic/Superhydrophobic Patterned Cellulose Film with Efficient Water Collection and Antibacterial Performance

“…The bacteria amounts still remain almost unchanged after the incubation with CTA or TiO 2 -Dopa/CTA surfaces. In comparison, nearly no bacteria are obviously detected in the case of the incubation with Ag-Dopa/CTA or hybrid surfaces, attributed to the presence of Ag NPs. − Furthermore, in spite of the reuse for 40 runs, the hybrid surface still harbored good antibacterial property with nearly no observation of the bacteria. On the basis of the high long-term water-collecting efficiency and antibacterial performance, the hybrid surface holds a promising application in safe water collection.…”

UV-Responsive Multilayers with Multiple Functions for Biofilm Destruction and Tissue Regeneration

“…Due to the limitation of available methodology, these two issues are considered separately rather than simultaneously. Moreover, the use of antimicrobial agents such as Ag nanoparticles (NPs) usually leads to cytotoxicity, whereas those antifouling substances such as PEG decrease cell adhesion to a great extent. , In fact, acceleration of cell adhesion and tissue regeneration around the implants, in particular after the bacteria or biofilms are killed and removed, is of critical importance. In this study, the multilayers assembled from P­(PA- co -AA) micelles and chitosan could simultaneously destroy biofilms under UV irradiation and allow good cell adhesion and proliferation afterward.…”

Various Techniques to Functionalize Nanofibers

“…It results in charged surface on electrospun fibers and favors adsorption. Liu et al fabricated electrospun fibers containing amine functional surface using polyurethane, 3-aminopropyltriethoxysilane, and utilized the charged functional groups (pH 3-5) -NH 3 + and -COO À for the adsorption of silver nanoparticles through electrostatic interaction [83]. Jassal et al fabricated PCL electrospun fibers, immobilized doxorubicin on hydrolyzed PCL fibers, and proved that doxorubicin drug adsorption on electrospun fibers is strongly pH dependent [84].…”