An insight into the effect of zinc oxide nanoparticles on the structural, thermal, mechanical properties and antimicrobial activity of Cs/PVA composite

Hezma, A. M.; Rajeh, A.; Mannaa, Mohammed A.

doi:10.1016/j.colsurfa.2019.123821

Cited by 197 publications

(62 citation statements)

References 45 publications

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“…[ 15 , 19 , 23 ]. This means that structure of ZnO NPs was not modified by the presence of CS [ 18 , 20 ], but the intensity of broad CS peak at 2θ ≈ 24° decrease in CS-ZnO films indicated the increase in the degree of amorphous regions of the nanocomposites films due to the interaction between the CS matrix and ZnO NPs and decreasing of water content [ 25 ]. Measurements of CS-ZnO films were carried out on copper substrate; therefore, there are additional diffraction patterns associated to Cu substrate at 2θ ≈ 43.3° and 2θ ≈ 50.4°; this fact is indicated in Figure 1 .…”

Section: Resultsmentioning

confidence: 99%

“…The increasing of Young’s modulus with ZnO concentration has been previously reported [ 12 , 15 , 20 ] and it has been interpreted by an additional energy-dissipating mechanism [ 12 ], weakness of intermolecular hydrogen bonds of CS formation of new hydrogen bonds between CS and ZnO [ 15 ]. CS-PVA-ZnO NPs membrane study [ 25 ] reported the maximum in Young’s modulus at 10 wt.% of NPs which has been explained by the interaction of ZnO NPs with CS-PVA functional groups.…”

Section: Resultsmentioning

confidence: 99%

“…It is noteworthy that the literature reports publications that deal with different methods of CS-ZnO nanocomposite preparation and their antibacterial, optical, photocatalytic activity (see, for example [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]), and mechanical [ 15 , 21 , 22 , 23 ] properties. In the case of mechanical properties, it has been reported that the ZnO content improves mechanical properties not only in CS-ZnO composite [ 15 , 22 , 23 ] but also in CS-cellulose-ZnO [ 24 ] and in CS-PVA-ZnO [ 25 ] materials.…”

Section: Introductionmentioning

confidence: 99%

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Chitosan-ZnO Nanocomposites Assessed by Dielectric, Mechanical, and Piezoelectric Properties

et al. 2020

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The aim of this work is to structurally characterize chitosan-zinc oxide nanoparticles (CS-ZnO NPs) films in a wide range of NPs concentration (0–20 wt.%). Dielectric, conductivity, mechanical, and piezoelectric properties are assessed by using thermogravimetry, FTIR, XRD, mechanical, and dielectric spectroscopy measurements. These analyses reveal that the dielectric constant, Young’s modulus, and piezoelectric constant (d33) exhibit a strong dependence on nanoparticle concentration such that maximum values of referred properties are obtained at 15 wt.% of ZnO NPs. The piezoelectric coefficient d33 in CS-ZnO nanocomposite films with 15 wt.% of NPs (d33 = 65.9 pC/N) is higher than most of polymer-ZnO nanocomposites because of the synergistic effect of piezoelectricity of NPs, elastic properties of CS, and optimum NPs concentration. A three-phase model is used to include the chitosan matrix, ZnO NPs, and interfacial layer with dielectric constant higher than that of neat chitosan and ZnO. This layer between nanoparticles and matrix is due to strong interactions between chitosan’s side groups with ZnO NPs. The understanding of nanoscale properties of CS-ZnO nanocomposites is important in the development of biocompatible sensors, actuators, nanogenerators for flexible electronics and biomedical applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chitosan-ZnO Nanocomposites Assessed by Dielectric, Mechanical, and Piezoelectric Properties

et al. 2020

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“…The polymer blend was prepared by employing a ratio of PAM/PVA (30/70 wt%) which has been reported [31] as a good ratio to give miscibility and utilizing a casting technique. The procedure involved a continuous stirring of the mixture till the solution was homogenous.…”

Section: Synthesis Of Ag/pam/pva Nanocompositesmentioning

confidence: 99%

“…The estimation of the mean size of the silver nanoparticles crystalline was made utilizing (Eq. 2), the Debye-Scherrer's equation [31]: The mean size of the particle was estimated 10 nm and was identified by determining the width of (111) Bragg's reflection.…”

Section: Xrdmentioning

confidence: 99%

Structural, thermal, optical and conductive properties of PAM/PVA polymer composite doped with Ag nanoparticles for electrochemical application

Ragab

Rajeh²

2020

J Mater Sci: Mater Electron

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In the present study, the chemical preparation of silver nanoparticles (Ag NPs) solution was achieved by decreasing silver salt via the use of sodium borohydride (NaBH 4). The particles appeared to have a crystalline nature through the XRD study, with a face-centered cubic (FCC) structure. The formation of silver nanoparticles (Ag NPs) was asserted by the UV, XRD and TEM. An absorption peak at around 430 nm was demonstrated through UV-visible spectrum of the aqueous medium which related to of Ag NPs. The solution casting method was used to prepare new nanocomposites films on the bases of polymer blend which related to of PAM-and PVA-doped with different wt% of Ag NPs. Various analytical techniques were used to characterize the prepared films. It was confirmed through the XRD analysis that there existed a complex formation between polymer blend and Ag NPs. A reduction in the value of the optical bandgap was displayed by UV-Vis with an increase in the concentration of Ag NPs. It was shown through the FTIR spectrum that there existed changes in the FTIR spectrum with dopant concentration indicating the interaction of dopant with the polymer blend. A great improvement in the thermal stability of the composites was proved through the TGA study with the loading of Ag NPs. The ionic conductivity at room temperature was improved by the doping of Ag NPs ions into the polymer blend system. This is attributed to the increase in mobile charge carriers and their mobility. The dielectric values in the studied frequency range indicate a strong dielectric dispersion which increases as the content of the Ag NPs increases. Consequently, these films can be suggested as a suitable application in optical devices and dielectric applications due to the observed improvement in optical properties and ac conductivity.

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Nano Technology in Food Packaging

Yadav,

Kumar,

Dixit

et al. 2024

Nonthermal Food Engineering Operations

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An insight into the effect of zinc oxide nanoparticles on the structural, thermal, mechanical properties and antimicrobial activity of Cs/PVA composite

Cited by 197 publications

References 45 publications

Chitosan-ZnO Nanocomposites Assessed by Dielectric, Mechanical, and Piezoelectric Properties

Chitosan-ZnO Nanocomposites Assessed by Dielectric, Mechanical, and Piezoelectric Properties

Structural, thermal, optical and conductive properties of PAM/PVA polymer composite doped with Ag nanoparticles for electrochemical application

Nano Technology in Food Packaging

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