Effects of ultrasonication duration and graphene oxide and nano-zinc oxide contents on the properties of polyvinyl alcohol nanocomposites

Zhang, Rong; Wang, Yihao; Ma, Donghui; Ahmed, Saeed; Qin, Wen; Liu, Yaowen

doi:10.1016/j.ultsonch.2019.104731

Cited by 59 publications

(37 citation statements)

References 77 publications

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“…The contact angle of water was measured by optical contact angle measuring instrument (Theta Flex, Biolin Technology Co., Ltd., Gothenburg, Sweden, mN/m) at room temperature (25 °C) using the static drop method. The dried film sample (5 × 5 cm) was immersed in 50 mL distilled water and kept at room temperature for 24 h, and then samples were weighed before and after immersion [ 21 ]. The swelling ratio (SR) of the film was calculated using the following formula:

where Wt is the film mass at t moment (g), and W 0 represents the initial mass (g).…”

Section: Methodsmentioning

confidence: 99%

“…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 ]. Ultrasonic treatment can also effectively reduce the size of biopolymer and form a uniform film, which has a positive impact on the mechanical properties and barrier properties of the film [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

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

Lan

Shama

et al. 2020

Polymers

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An antibacterial and anti-oxidation composite film was prepared by a casting method using sodium alginate (SA) and apple polyphenols (APPs) as the base material and glycerol as the plasticizer. Silver nanoparticles (AgNPs) were deposited by ultrasonic-assisted electrospray method. The degree of influence of the addition ratio of SA and AgNPs and different ultrasonic time on the mechanical properties, barrier properties, optical properties, and hydrophilicity of the composite film was explored. The composite films were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the SA: AgNPs ratio of 7:3 and the ultrasonic time for 30 min have the best comprehensive performance, and SA/AgNPs/APP films showed the lowest water vapor permeability value of 0.75 × 10−11 g/m·s·Pa. The composite film has good strength and softness, with tensile strength (TS) and elongation at break (E) at 23.94 MPa and 29.18%, respectively. SEM images showed that the surface of the composite film was smooth and the AgNPs’ distribution was uniform. The composite film showed broad antibacterial activity, and the antibacterial activity of Escherichia coli (92.01%) was higher than that of Staphylococcus aureus (91.26%). However, due to the addition of APP, its antioxidant activity can reach 98.39%, which has a synergistic effect on antibacterial activity. For strawberry as a model, the results showed that this composite film can prolong the shelf life of strawberries for about 8 days at 4 °C, effectively maintaining their storage quality. Compared with the commonly used PE(Polyethylene film) film on the market, it has a greater fresh-keeping effect and can be used as an active food packaging material.

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where Wt is the film mass at t moment (g), and W 0 represents the initial mass (g).…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Lan

Shama

et al. 2020

Polymers

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“…Light cannot directly pass through a crystalline polymer, so refraction and reflection occurred at the PVA/PAAS nanofiber interface [ 55 ]. Further, nanofibers fabricated by electrospinning were opaque [ 65 ]. Light transmittance decreased with increasing EN content.…”

Section: Resultsmentioning

confidence: 99%

Long-Term Antibacterial Effect of Electrospun Polyvinyl Alcohol/Polyacrylate Sodium Nanofiber Containing Nisin-Loaded Nanoparticles

Jiang

et al. 2020

Nanomaterials

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Response Surface Methodology (RSM) was used to assess the optimal conditions for a Water/Oil/Water (W/O/W) emulsion for encapsulated nisin (EN). Nano-encapsulated nisin had high encapsulation efficiencies (EE) (86.66 ± 1.59%), small particle size (320 ± 20 nm), and low polydispersity index (0.27). Biodegradable polyvinyl alcohol (PVA) and polyacrylate sodium (PAAS) were blended with EN and prepared by electrospinning. Scanning electron microscopy (SEM) revealed PVA/PAAS/EN nanofibers with good morphology, and that their EN activity and mechanical properties were enhanced. When the ultrasonication time was 15 min and 15% EN was added, the nanofibers had optimal mechanical, light transmittance, and barrier properties. Besides, the release behavior of nisin from the nanofibers fit the Korsemeyer–Peppas (KP) model, a maximum nisin release rate of 85.28 ± 2.38% was achieved over 16 days. At 4 °C, the growth of Escherichia coli and Staphylococcus aureus was inhibited for 16 days in nanofibers under different ultrasonic times. The application of the fiber in food packaging can effectively inhibit the activity of food microorganisms and prolong the shelf life of strawberries, displaying a great potential application for food preservation.

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“…The spectrum of the PVA/CMC/ x GnP film showed that upon the addition of x GnP to PVA/CMC, the intensity of other peaks related to PVA/CMC decreased, while the signature band of x GnP at 3440 cm −1 became red-shifted and broadened, possibly because of the synergetic influence of strain and doping [ 36 ]. The characteristic peaks of the PVA/CMC/ZnO NPs/ x GnP films were similar to (but weaker than) those of the PVA/CMC film, and the OH stretch of the former at 3380 cm −1 and the asymmetric –COO− stretch at 1600 cm −1 red-shifted to 3260 and 1590 cm −1 , respectively, in case of the latter, which indicated a strong interaction between these groups and ZnO NPs or x GnP [ 25 ]. The absence of new peaks suggested that the interactions between ZnO NPs or x GnP and the PVA/CMC matrix were purely physical (e.g., hydrogen bonds and van der Waals forces).…”

Section: Resultsmentioning

confidence: 99%

“…Biodegradability was determined by measuring the weight loss of the membranes buried under soil [ 25 ]. For the biodegradability analysis, the membranes were cut into 6 cm × 1 cm pieces (further 3 cm × 3 cm samples were taken for photographing), weighed, tied at one corner with a thread and buried about 15 cm below the surface of the soil.…”

Section: Methodsmentioning

confidence: 99%

Effects of Ultrasonication Time on the Properties of Polyvinyl Alcohol/Sodium Carboxymethyl Cellulose/Nano-ZnO/Multilayer Graphene Nanoplatelet Composite Films

Zhang

Dong

et al. 2020

Nanomaterials

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Ultrasonication-assisted solution casting was used to prepare polyvinyl alcohol (PVA)/sodium carboxymethyl cellulose (CMC)/nano-ZnO/multilayer graphene nanoplatelet (xGnP) composite films; the performances (mechanical properties, water vapor permeability (WVP), biodegradability and antibacterial activity) of these films were investigated as a function of the ZnO NPs:xGnP mass ratio and ultrasonication time. Intermolecular interactions among ZnO NPs, xGnP and the PVA/CMC matrix were shown to improve WVP, while X-ray diffraction and scanning electron microscopy analyses revealed that the internal reticular structure of ultrasound-treated PVA/CMC/ZnO NPs/xGnP composite films was in a fluffier state than that of the untreated composite films and the PVA/CMC film. The incorporation of ZnO NPs and xGnP into the composite film reduced its tensile strength and elongation at break, and increased antibacterial activity and biodegradability. In addition, we carried out the experiment of strawberry preservation and measured weight loss ratio, firmness, content of total soluble solids and titration acid. Finally, the composite film of 7:3 had the best preservation effect on strawberries. Thus, the obtained results paved the way to develop novel biodegradable composite films with antimicrobial activity for a wide range of applications.

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Effects of ultrasonication duration and graphene oxide and nano-zinc oxide contents on the properties of polyvinyl alcohol nanocomposites

Cited by 59 publications

References 77 publications

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

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

Long-Term Antibacterial Effect of Electrospun Polyvinyl Alcohol/Polyacrylate Sodium Nanofiber Containing Nisin-Loaded Nanoparticles

Effects of Ultrasonication Time on the Properties of Polyvinyl Alcohol/Sodium Carboxymethyl Cellulose/Nano-ZnO/Multilayer Graphene Nanoplatelet Composite Films

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