Ultrasonic dispersion and activation of TiO2 nanoparticles and its effect on bacterial inhibition in EVA films

Investigation of Ultrasonic Treatment on Physicochemical, Structural and Morphological Properties of Sodium Alginate/AgNPs/Apple Polyphenol Films and Its Preservation Effect on Strawberry

“…However, if the ultrasound time is too long, it will lead to aggregation again. This was verified in this study, similar to the Zhang et al [ 20 ]. Notably, 7:3–30 min is the smoothest composite film with a microstructure, which also verifies the influence of different ratios and ultrasonic times on the barrier properties, mechanical properties and hydrophilicity of the composite film.…”

“…Secondly, the uniform AgNPs has a certain resistance to the invasion of water molecules, which eventually leads to the decrease in SR. However, the ultrasonic time transition leads to the aggregation of AgNPs and the formation of pores, which results in the increase in SR [ 20 ]. As for the decrease in 10:0 SR caused by ultrasound, it may be due to the more closed matrix caused by ultrasound, which makes the blend film more difficult to contact water, and the surface cross-linking degree of CaCl 2 is high [ 32 ].…”

“…Among them, ultrasonic treatment will lead to high pressure, which will cause high stress, and then destroy the binding energy of nanoparticles [ 19 ]. The use of ultrasound for dispersion is also considered to be an effective way to destroy aggregates into smaller particles without the need for chemical dispersants [ 20 ]. The results show that the appropriate ultrasonic treatment time (30 min) can improve the performance of the film and effectively disperse graphene oxide and zinc oxide nanoparticles [ 21 ].…”

Enhanced photocatalytic degradation of organic dyes by ultrasonic-assisted electrospray TiO2/graphene oxide on polyacrylonitrile/β-cyclodextrin nanofibrous membranes

“…1 (h2), larger GO sheets appeared, and since the GO content was high, the dispersion of the GO sheets diminished and they tended to aggregate during the electrospinning process, which led to an increase in roughness and sheet formation. The observed clusters of NPs after ultrasonic treatment revealed that the NPs were not dispersed in the form of single peak, but in the form of aggregates, which was consistent with the research results of Estrada-Monje et al [19] . With the exception of the PAN/β-CD/TiO 2 nanofibrous membrane, the TiO 2 NPs were evenly distributed between the nanofibers and within the nanofibers, without any serious agglomeration or significant changes in structure.…”

“…It is well known that ultrasonic treatment is an effective method for dispersing nanoparticles. During ultrasonic treatment, the NPs are depolymerized from large aggregates into small dispersions due to the large amount of energy generated by the cavitation effect (i.e., the rapid formation, growth, and breakdown of unstable bubbles in the liquid), and the specific surface area of nanomaterials is increased so as to perform its role effectively [19] . Baig et al found that TiO 2 NPs can be well dispersed and uniformly attached to the surface of GO sheets under ultrasonic conditions.…”