Evaluation of mechanical, optical and thermal properties of PVA nanocomposites embedded with Fe2O3 nanofillers and the investigation of their thermal decomposition characteristics under non-isothermal heating condition

Parthasarathy, V.; Selvi, J.; Kumar, Pankaj; Anbarasan, R.; Mahalakshmi, S.

doi:10.1007/s00289-020-03206-3

Cited by 28 publications

(13 citation statements)

References 30 publications

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“…The thermal decomposition temperatures ( T d ) of PVA, PNIPAM, and PVA–PNIPAM were 372.1, 335.7, and 407.2 °C, respectively (Figure S5). The weight loss of the hydrogels can be divided into three stages: (I) evaporation of water on the hydrogel surface as well as loss of internal FW and weakly BW; (II) the loss of BW due to strong hydrogen bonding; and (III) decomposition of hydrogel polymer backbone. , The weight loss of each hydrogel (Table S2) indicates that CPV in stage II is 31.54%, much higher than that of CPN (10.82%) and CPVPN (0.12%). This may be caused by numerous hydroxyl groups in CPV form strong hydrogen bonds with BW, which contains higher desorption enthalpy.…”

Section: Resultsmentioning

confidence: 99%

PVA–PNIPAM Hydrogel-Based Moisture-Electric Generators with Tunable Pore Structures for Enhanced Power Generation

Ma,

Li,

Zhou

et al. 2024

ACS Appl. Polym. Mater.

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A hygroscopic layer plays an important role in improving the output abilities of energy generation from ubiquitous moisture, whose mechanism is unclear. Herein, three kinds of hydrogels with different pore structures/functional groups are designed as hygroscopic layers, and a universal strategy was proposed to assemble them into hydrogel-based moisture-electric generators (HMEGs). The hydrogels' pore structure affects the moisture absorption rate, while the functional groups regulate the diffusion path of water. HMEG's power generation is a synergistic effect of ionic diffusion and streaming potential, which is closely related to the water diffusion within the material and is not directly related to the amount of moisture absorption. HMEG, which absorbs moisture quickly, stores water efficiently, and releases moisture slowly, has an excellent performance and stable voltage output. Based on this mechanism, HMEG employed the calcium chloride-poly(vinyl alcohol)-poly(N-isopropylacrylamide) (CPVPN), semi-interpenetrating network (semi-IPN) hydrogel as the hygroscopic layer showed an open-circuit voltage as high as 0.34 V and a power density of 33.23 μA cm −3 . This study opens a perspective on hydrogel HMEG and provides insights into high-performance HMEG design.

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Section: Resultsmentioning

confidence: 99%

PVA–PNIPAM Hydrogel-Based Moisture-Electric Generators with Tunable Pore Structures for Enhanced Power Generation

Ma,

Li,

Zhou

et al. 2024

ACS Appl. Polym. Mater.

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“…Selvi et al [ 48 ] fabricated 6% ZnO/PVA nanocomposite thin film and found the electrical conductivity of 1.48 × 10 −8 S/cm. Further 6% Fe 2 O 3 was added in PVA and fabricated the thin film and found the electrical conductivity as 2.4 × 10 −8 S/cm [ 49 ]. When compared with existing literature, GCN-doped PVA has higher conductivity due to the presence of more conjugated bonds.…”

Section: Resultsmentioning

confidence: 99%

“…Selvi et al [48] fabricated 6%ZnO/PVA nanocomposite thin film and found the electrical conductivity of 1.48x10 -8 S/cm. Further 6% Fe2O3 was added in PVA and fabricated the thin film and found the electrical conductivity as 2.4x10 -8 S/cm [49].…”

Section: Electrical Conductivitymentioning

confidence: 99%

Smart apparel using nano graphitic carbon nitride/PVA in a cotton cloth for military application

Krishnaswamy

Panigrahi²,

Ramakrishnan³

et al. 2022

Heliyon

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“…The formation of agglomerates in different nanocomposites has been observed by the researchers. [9,39,58,59].…”

Section: Fesem Analysismentioning

confidence: 99%

Role of Mono- (Ag, Fe) and Bi- (Ag-Fe) metallic nanoparticles on EMI shielding and antimicrobial activity of PVA/ PVP blends - A green approach

Ramisetti¹,

Madhuri

Danikonda

et al. 2023

Preprint

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Plant-mediated solution casting is used to develop eco-friendly biopolymer blend nanocomposites from polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP) embedded with Silver (Ag), Ferrous (Fe) monometallic and Silver-Ferrous (Ag-Fe) bimetallic nanoparticles (NPs). These nanocomposites were developed to understand their EMI shielding efficiency and antimicrobial activities, besides evaluating their physical and chemical properties using XRD, FTIR, FESEM, and EDX characterization techniques. The XRD spectra, revealed that the incorporation of nanoparticles into the blend has resulted in reduction the crystalline nature, significantly. For A3F3 it is reduced from 0.38 to 0.24. The results from FESEM, EDAX and the X-ray diffraction, all corroborate the presence of nanoparticles. The TGA tests reveal that the thermal stability of bimetallic composites is greater than that of monometallic composites, with sample A4F2 showing great improvement. The UTM study of mechanical characteristics showed that the addition of nanoparticles to the polymer matrix increased its mechanical strength. Among all nanocomposites, the A5F1 composite has shown higher tensile stress of 85.5 MPa and Young’s modulus of 7579.7 MPa. We examined its efficacy against Escherichia coli and Staphylococcus aureus and Candida albicans as microorganisms. Good antibacterial and antifungal activity was observed. The bimetallic composites demonstrated greater activity than monometallic composites against these bacterial and fungal species. All bimetallic nanocomposites have shown superior, loss due to reflection, loss due to absorption and the total EMI shielding efficiency at X- and Ku- bands. The samples A5F1 and A4F2, shown highest value of total EMI shielding efficiency of 18 and 32 dB at 8 and 16 GHz respectively. Enhanced antimicrobial, EMI shielding efficiency along with their physical properties, makes these nanocomposites suitable for food and medical packaging, coatings and EMI shielding applications.

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Evaluation of mechanical, optical and thermal properties of PVA nanocomposites embedded with Fe2O3 nanofillers and the investigation of their thermal decomposition characteristics under non-isothermal heating condition

Cited by 28 publications

References 30 publications

PVA–PNIPAM Hydrogel-Based Moisture-Electric Generators with Tunable Pore Structures for Enhanced Power Generation

PVA–PNIPAM Hydrogel-Based Moisture-Electric Generators with Tunable Pore Structures for Enhanced Power Generation

Smart apparel using nano graphitic carbon nitride/PVA in a cotton cloth for military application

Role of Mono- (Ag, Fe) and Bi- (Ag-Fe) metallic nanoparticles on EMI shielding and antimicrobial activity of PVA/ PVP blends - A green approach

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