Structural, optical and AFM characterization of PVA:La3+ polymer films

Ali, F. M.; Maiz, F.

doi:10.1016/j.physb.2017.10.124

Cited by 30 publications

(12 citation statements)

References 21 publications

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“…This discovery implies that Er 3+ ‐ions were absorbed into the hybrid blend film, suggesting increased amorphous areas. These results agree with previous studies 3,4,20,25,46,47 …”

Section: Resultssupporting

confidence: 94%

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Synthesis, characterization, and tailoring variations in the linear optical of erbium‐ions doped (PVA/PVP) polymeric composites for optical devices: Improvement of the dielectric characteristics

Mohammed

Yahia

El‐Mongy

2023

J of Applied Polymer Sci

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The simple solution casting method was utilized for preparing composite films (PVA-30 wt% PVP) incorporated with various content of erbium ions (Er 3+ ) (0.11, 0.37, 1.85, 3.7, 9.25, and 18.5) wt%. The composite films' properties were investigated using XRD, UV-Vis, and dielectric spectrometers. The XRD patterns showed a noticeable decline in structural elements, including crystallinity level. The transmittances of the investigated samples decrease as Er 3+ increases. Studies on UV-Vis absorption have revealed that the UV-Vis absorption spectra are shifting to the higher wavelengths, causing a decrease in the optical energy bandgap values from 4.66 to 3.48 eV for an indirect transition and from 5 to 4.84 eV for a direct transition, which suggests that the filler interacts with the blend matrix. As the number of localized states in the forbidden energy bandgap rises, it has been shown that with increasing Er 3+ -the estimated Urbach's energy increases from 1.95 to 32 meV. The addition of erbium ions raises the refractive index of the blend film. The optical limits of the samples are investigated using a He-Ne laser beam with a wavelength of 632.8 nm and a solid-state green diode laser beam with a wavelength of 532 nm. The prospect of greater charge carrier concentration and mobility was confirmed by increased AC conductivity with increasing frequency. Dielectric permittivity and dielectric loss tangent were utilized to analyze dielectric behavior. The analysis of the electric modulus (M 0 and M 00 ) of as-prepared samples has been completed. These findings are anticipated to notably impact a broad spectrum of applications, including organic semiconductors, optoelectronic devices, polymer solar cells, and polymer waveguides. K E Y W O R D Sdielectric characteristics, erbium ions (Er 3+ )-doped PVA/PVP, optical limiting/CUT-OFF laser filters, refractive index-bandgap analysis, XRD/FTIR

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“…This discovery implies that Er 3+ ‐ions were absorbed into the hybrid blend film, suggesting increased amorphous areas. These results agree with previous studies 3,4,20,25,46,47 …”

Section: Resultssupporting

confidence: 94%

“…Er 3+doped (PVA-PVP) samples become appropriate for optoelectronic applications by adjusting the band gap. 53 Numerous investigations 3,28,47 have also noted that the energy gap narrows as doping levels rise.…”

Section: Optical Studiesmentioning

confidence: 99%

Synthesis, characterization, and tailoring variations in the linear optical of erbium‐ions doped (PVA/PVP) polymeric composites for optical devices: Improvement of the dielectric characteristics

Mohammed

Yahia

El‐Mongy

2023

J of Applied Polymer Sci

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“…Atomic Force Microscopy (AFM) is used to obtain images with atomic resolution of up to one tenth of nanometers. This type of microscopy can be effectively applied in the field of polymers to study the surface characteristics of polymer film samples [55]. Furthermore, AFM can offer information on the interaction between the matrix and the immobilized enzyme.…”

Section: Morphological Analysis Of the Surfacementioning

confidence: 99%

(Hydroxypropyl)methyl cellulose-chitosan film as a matrix for lipase immobilization: Operational and morphological study

Vassiliadi

Aridas

Schmitt

et al. 2022

Molecular Catalysis

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“…The modified ZSM-5 membranes demonstrate the identical characteristic peaks as in pristine ZSM-5 at 2θ at 6 • -10 • (doublet), and 22 • -25 • (triplet), respectively, which indicated that the crystalline structure of ZSM-5 was not altered after incorporation in the PVA backbone [43]. Moreover, the crystallinity of the PVA (at 2θ of 19.4 • ) decreased when the dosage of ZSM-5 improved from 20% to 60% [44]. It might be due to the breaking of hydrogen bonds between PVA chains and the insertion of ZSM-5 as an intervening material.…”

Section: Xrd Analysismentioning

confidence: 66%

“…improved from 20% to 60% [44]. It might be due to the breaking of hydrogen bonds between PVA chains and the insertion of ZSM-5 as an intervening material.…”

Section: Xrd Analysismentioning

confidence: 96%

PVA-Based Mixed Matrix Membranes Comprising ZSM-5 for Cations Separation

et al. 2020

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The traditional ion-exchange membranes face the trade-off effect between the ion flux and perm-selectivity, which limits their application for selective ion separation. Herein, we amalgamated various amounts of the ZSM-5 with the polyvinyl alcohol as ions transport pathways to improve the permeability of monovalent cations and exclusively reject the divalent cations. The highest contents of ZSM-5 in the mixed matrix membranes (MMMs) can be extended up to 60 wt% while the MMMs with optimized content (50 wt%) achieved high perm-selectivity of 34.4 and 3.7 for H+/Zn2+ and Li+/Mg2+ systems, respectively. The obtained results are high in comparison with the commercial CSO membrane. The presence of cationic exchange sites in the ZSM-5 initiated the fast transport of proton, while the microporous crystalline morphology restricted the active transport of larger hydrated cations from the solutions. Moreover, the participating sites and porosity of ZSM-5 granted continuous channels for ions electromigration in order to give high limiting current density to the MMMs. The SEM analysis further exhibited that using ZSM-5 as conventional fillers, gave a uniform and homogenous formation to the membranes. However, the optimized amount of fillers and the assortment of a proper dispersion phase are two critical aspects and must be considered to avoid defects and agglomeration of these enhancers during the formation of membranes.

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Structural, optical and AFM characterization of PVA:La3+ polymer films

Cited by 30 publications

References 21 publications

Synthesis, characterization, and tailoring variations in the linear optical of erbium‐ions doped (PVA/PVP) polymeric composites for optical devices: Improvement of the dielectric characteristics

Synthesis, characterization, and tailoring variations in the linear optical of erbium‐ions doped (PVA/PVP) polymeric composites for optical devices: Improvement of the dielectric characteristics

(Hydroxypropyl)methyl cellulose-chitosan film as a matrix for lipase immobilization: Operational and morphological study

PVA-Based Mixed Matrix Membranes Comprising ZSM-5 for Cations Separation

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