Effect of ZnO nanofiller on dielectric and mechanical properties of PVA/PVP blend

Rajesh, Kumar; Crasta, Vincent; Kumar, Nikhil; Shetty, Gananatha

doi:10.1063/1.5130306

Cited by 8 publications

(8 citation statements)

References 13 publications

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“…The dielectric constant also shows a maximum near the percolation threshold [ 36 , 37 ]; however, refs. [ 31 , 32 , 33 , 34 , 35 ] do not report a conductivity percolation effect. It is noteworthy that ZnO NPs exhibit low conductivity such that the PVA-ZnO composite’s conductivity is ca.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, this material can be considered as a dielectric matrix with dielectric inclusions. It is noteworthy that for different polymer-ZnO NPs composites, the dielectric constant depends upon ZnO content where a maximum is observed; for instance, in PVDF-ZnO at 0.06 vol.% of ZnO [ 31 ]; in PVDF-ZnO 5.5 vol.% of ZnO [ 32 ]; in PVDF-ZnO at 15 wt.% [ 33 ]: in PVA/PVP-ZnO at 8 wt.% [ 34 ]; in PVA-ZnO at 10 mol% [ 35 ]. The explanation of the maximum in the dielectric constant proposed in these articles is based upon classical percolation theory; by increasing conductivity inclusions in dielectric matrix the conductivity of composites increases at the percolation threshold and upon higher concentration of fillers there appears a saturation.…”

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…At higher frequencies, the contribution of these interfaces to the overall dielectric response may diminish, leading to a decrease in both ε' and ε″. Figure 10 shows the dielectric constant ε′ and dielectric loss ε″, of the materials under investigation as a function of frequency () at room temperature, which was calculated according to equation 12 and 13 [41].…”

Section: Optical Propertiesmentioning

confidence: 99%

“…Figure 9 depicts the variation in band-gap as a function of dopant concentration. At lower frequencies, interfacial polarization between different phases contributes significantly to the dielectric response [41,42]. However, at higher frequencies, the response is dominated by the bulk material, leading to reduced interfacial polarization and, consequently, decreased dielectric constant and loss [43][44][45].…”

Section: Optical Propertiesmentioning

confidence: 99%

Study the effect of Zn2SnO4/ZnO/SnO2 on the structural, optical, and electrical properties of PVA nanocomposites for promising applications

Saadeldin,

Samir,

Desouky

2024

Preprint

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This study details the successful incorporation of zinc tin oxide nanoparticle (ZTO-NPs) into polyvinyl alcohol (PVA) using the hydrothermal method. We introduce a streamlined and integrated synthesis approach, representing a novel direction for polymeric composite films with wide-ranging applications. This was achieved by creating a nanocomposite in a PVA matrix using ZTO-NPs composite as a filler at different concentrations that can be extended to use in many applications, such as optoelectronics. The study delves into the impact of ZTO-NPs loadings on the optical, electrical, and structural properties of PVA films across different concentrations. Structural analysis of ZTO-NPs and resulting ZTO/PVA nanocomposite films is performed using X-ray diffraction (XRD), while Fourier transform infrared (FT-IR) analysis confirms the interaction between ZTO-NPs and PVA. Atomic force microscopy (AFM) is employed to analyze surface morphology and roughness, while diffuse reflectance spectroscopy (DRS) reveals enhanced UV absorption and a red-shift with increased ZTO-NPs concentration. Moreover, the optical band-gap decreases with higher ZTO-NPs concentration. Electrical properties, including dielectric constant, dielectric loss, conductivity, and electric modulus, are investigated at room temperature across different frequencies, indicating an increase in dielectric constant with ZTO-NPs concentration.

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“…Polyvinyl alcohol and polyvinyl pyrrolidone are chosen because they are water soluble, biocompatible, nontoxic polymers having good film-forming ability, and chemical and thermal stability. 29,30 The presence of the hydroxyl group in PVA and the carbonyl group in PVP allows for chemical bonding interaction with the filler which helps in the uniform distribution of the filler in the polymer matrix, thus resulting in uniform attenuation. The gamma-ray attenuation characteristics of the developed composites were studied theoretically using Phy-X software.…”

mentioning

confidence: 99%

Flexible, chemically bonded bismuth/tungsten‐based polyvinyl alcohol‐polyvinyl pyrrolidone composite for gamma and neutron shielding application

Bijanu,

Arya,

Rajak

et al. 2024

J of Applied Polymer Sci

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In this paper, the gamma and neutron shielding behavior of chemically bonded high atomic number (Z), tungsten trioxide‐polyvinyl alcohol‐polyvinylpyrrolidone (PW), and bismuth oxide‐polyvinyl alcohol‐polyvinylpyrrolidone (PB) composites were reported at varying thickness. The PW and PB composites were prepared through the dissolution technique rather than the commonly used dispersion technique. The gamma and neutron attenuation characteristics of the composites were studied using 22Na (0.511 and 1.274 MeV energy) and 252Cf (0–10 MeV energy) sources, respectively. The half value layer of PW and PB composite was found to be 61.22 ± 0.914 mm and 48.29 ± 1.52 mm and the linear attenuation coefficient was found to be 0.115 and 0.144 cm−1 at 0.511 MeV, respectively. Further, the experimental gamma‐ray attenuation results were validated theoretically using Phy‐X software and found to be well in agreement with the experimental data. Both the composites also showed similar neutron shielding behavior when compared to the commercially used high‐density polyethylene (HDPE). The developed composites possess good mechanical properties as they did not show any cracks or wrinkles after undergoing 5400 bending cycles during the flex test, showing their high durability of flexibility. Thus, these composites are found to be suitable for shielding both, the gamma‐rays and neutrons.

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Effect of ZnO nanofiller on dielectric and mechanical properties of PVA/PVP blend

Cited by 8 publications

References 13 publications

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

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

Study the effect of Zn2SnO4/ZnO/SnO2 on the structural, optical, and electrical properties of PVA nanocomposites for promising applications

Flexible, chemically bonded bismuth/tungsten‐based polyvinyl alcohol‐polyvinyl pyrrolidone composite for gamma and neutron shielding application

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