Design of super‐tough and antibacterialPPR/nano‐ZnOcomposites based on the excellent dispersion ofZnOparticles

Abstract

Herein, polyvinyl pyrrolidone (PVP) dispersants are used to disperse and isolate zinc oxide (ZnO) particles. A high-pressure spray device is used to dry the dispersed nano-fillers quickly to achieve the structure of PVP chains wrapping and isolating ZnO particles. Scanning electron microscopy shows that most of the size of the agglomerated ZnO nanoparticles in polypropylene random (PPR, obtained by random copolymerization of propylene and ethylene) is maintained below 100 nm, and only a small amount of large agglomerates with a particle size less than 400 nm. An excellent dispersion of nano-ZnO fillers prepared by this method can greatly improve the toughness of PPR and endow it with good antibacterial properties. When the content of the ZnO

Antibacterial Halloysite‐Modified Chitosan/Polyvinylpyrrolidone Nanofibers for Ultrasensitive Self‐Powered Motion Monitoring

“…The antibacterial properties of the CTS/PVP/HNTs‐2 nanofibers against E. coli (ATCC 8739) and S. aureus (ATCC 6538) were tested by the Chengdu Ceshigo Research Service Center, where all the test conditions are based on the current national standard GB/T 31402–2015. [ 38,39 ] The initial bacteria suspension concentration of E. coli is 8.9 × 10 5 CFU/mL and that of S. aureus is 8.7 × 10 5 CFU/mL, which can meet the standard test requirements. [ 38 ] After culturing for 24 h, all samples were recovered immediately by adding 10 mL of SCDLP culture solution to the petri dish and rinsing the sample thoroughly, and then counting the colonies to evaluate the antibacterial properties.…”

“…[ 38,39 ] The initial bacteria suspension concentration of E. coli is 8.9 × 10 5 CFU/mL and that of S. aureus is 8.7 × 10 5 CFU/mL, which can meet the standard test requirements. [ 38 ] After culturing for 24 h, all samples were recovered immediately by adding 10 mL of SCDLP culture solution to the petri dish and rinsing the sample thoroughly, and then counting the colonies to evaluate the antibacterial properties. The average number of viable bacteria immediately tested after inoculation is represented by U 0 .…”

“…According to the counting results, the average number of viable E. coli and S. aureus after 24 h bacterial culture of the control groups is 2.4 × 10 5 and 2.4 × 10 5 CFU cm −2 , while that of the experiment groups is 1.3 × 10 0 and 2.5 × 10 0 CFU/cm 2 . Based on the above experimental data, the antibacterial rate and the antibacterial activity can be calculated by the following Equations ( 1) and ( 2), [28,38] where M is the average number of the surviving bacteria cells of the three control samples on the plates after 24 h culturing, and N is that of the tested three CTS/PVP/HNTs nanofibers, respectively. In addition, U t and A t are the logarithm of M and N, respectively.…”

“…During the measurement process, a sterile inoculation loop was used to transfer a loop of precultured bacteria to a small amount of nutrient broth and diluted it to make sure that the initial bacteria concentration ranged from 2.5 × 10 5 to 10 × 10 5 CFU mL −1 . [ 38 ] The tested films were put on the sterile glass plate after UV radiation sterilization for 30 min, then 400 μL bacteria suspension with a suitable concentration was evenly seeded on the surface of the tested films by pipette. After culturing for 24 h, all samples were recovered immediately by adding 10 mL of SCDLP culture solution to the petri dish and rinsed the sample thoroughly and then counted the colonies to evaluate the antibacterial properties.…”

SiO2 and ZnO hybrid nanofillers modified natural rubber latex: Excellent mechanical and antibacterial properties

“…[19,20] When the size of ZnO reaches the nanoscale, nano-ZnO has photocatalytic antibacterial effect due to the nano-size effect. [21] Therefore, the antibacterial properties of nano-ZnO are the particularly outstanding properties among these functional properties. [22,23] Despite the outstanding modification effect of nanoscale silica, the agglomeration of nanoparticles and the problem of dispersibility in the polymer matrix are still serious problems.…”