Characterization, optical, and electrical properties of chitosan/polyacrylamide blend doped silver nanoparticles

Algethami, Norah; Rajeh, A.; Ragab, H.M.; Tarabiah, A. E.; Gami, Fatma

doi:10.1007/s10854-022-08048-5

Cited by 30 publications

(11 citation statements)

References 47 publications

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“…The change in crystallinity will get as a result of the interaction of CR−Ag with the PVA which is pointed out in the FTIR studies. From our XRD data of CR−Ag−PVA nanocomposites, it had been evident that amorphous areas were predominated at low filler concentrations which is also in good agreement with Algethami et al [43] . Effective intra‐, inter‐molecular hydrogen bonds between PVA chains, are the cause of crystallinity, the size of the crystals along with the intensity of diffraction depends on how many PVA chains are coupled.…”

Section: Resultssupporting

confidence: 89%

“…[42] The change in crystallinity will get as a result of the interaction of CRÀ Ag with the PVA which is pointed out in the FTIR studies. From our XRD data of CRÀ AgÀ PVA nanocomposites, it had been evident that amorphous areas were predominated at low filler concentrations which is also in good agreement with Algethami et al [43]…”

Section: Chemistryselectsupporting

confidence: 89%

“…At higher frequencies, where more charges were building up, the values of tanδ slightly went up. The increase in filler content results in a decrease in the interparticle distance, which in turn results in a reduction in the charge‐trapping sites [43] . The loss tangent of all the films increases with increasing frequency and is because of a mismatch/difference between the hopping frequency and the applied external frequency [58] …”

Section: Resultsmentioning

confidence: 99%

“…To support this point, analogous findings can be found in the literature. [43] At room temperature, Figure 15 shows that the loss tangent slightly increases as the amount of filler in the PVA matrix increases in addition it increases as the frequency shoots up. Since free charges tend to accumulate at the interface among films and electrodes, the maximum value of tanδ is seen at lower frequencies.…”

Section: Loss Tangentmentioning

confidence: 99%

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Biosynthesized Silver Nanoparticles Encapsulated in a Poly(vinyl alcohol) Matrix: Dielectric and Structural Properties

et al. 2022

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In the present investigation, silver (Ag) nanoparticles were prepared employing green synthesis from the aqueous leaves extract of Cyperus rotundus (CR) plant at ambient temperature in less reaction time. A preliminary phytochemical analysis test was performed, and it has been revealed that the extract comprised bioactive components such as alkaloids, phenols, and terpenoids, among others. For average size, the morphology (spherical shape) and purity of the nanoparticles were characterized using scanning electron microscopy (SEM, 358 nm) with energy-dispersive X-ray (EDX), dynamic light scattering (27 nm), high-resolution transmission electron microscopy (3.9 nm), and selected area electron diffraction (SAED) pattern methods. Without any extra peaks in the EDX spectrum, the produced Ag nanoparticles were confirmed to be pure. In addition, the solvent-casting approach has been used to encapsulate a different weight fraction of biosynthesized Ag nanoparticles (CRÀ AgÀ NPs) in a polyvinyl alcohol (PVA) matrix. By using UV-visible, FTIR spectroscopy, and SEM, we were able to characterize the synthesized CRÀ AgÀ NPs as well as their composite (PVA) films, and we were able to compare the results with those of pristine PVA. The effects of doping with CRÀ AgÀ NPs on structural and morphological changes of PVA were studied. Impedance studies, including dielectric constant, dielectric loss, tangent loss, and AC conductivity, revealed that incorporating CRÀ AgÀ NPs into the PVA matrix impacts the electrical properties of PVA. This study showed that the synthesized nanoparticles had a spherical shape with entangled biocomponents and were encapsulated within the PVA polymer matrix, indicating that CRÀ AgÀ NPs can be used in various applications (wound healing).

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Section: Resultssupporting

confidence: 89%

Section: Chemistryselectsupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Loss Tangentmentioning

confidence: 99%

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Biosynthesized Silver Nanoparticles Encapsulated in a Poly(vinyl alcohol) Matrix: Dielectric and Structural Properties

et al. 2022

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“…Metals and their oxides are used as additives for polymer electrically conductive composite materials: Fe 2 O 3 , TiO 2 [ 12 ], Mg, Se [ 13 ], SnO 2 , [ 14 ], cesium bromide [ 15 ], silver [ 16 ], and gold nanoparticles [ 17 , 18 ]. Materials based on polymers of aliphatic structure—PVOH, PEG, chitosan, and cellulose—are used both in engineering and in medical devices.…”

Section: Introductionmentioning

confidence: 99%

Influence of Electric Field on Proliferation Activity of Human Dermal Fibroblasts

Kamalov

Shishov

Смирнова

et al. 2022

JFB

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In this work, an electrically conductive composite based on thermoplastic polyimide and graphene was obtained and used as a bioelectrode for electrical stimulation of human dermal fibroblasts. The values of the electrical conductivity of the obtained composite films varied from 10−15 to 102 S/m with increasing graphene content (from 0 to 5.0 wt.%). The characteristics of ionic and electronic currents flowing through the matrix with the superposition of cyclic potentials ± 100 mV were studied. The high stability of the composite was established during prolonged cycling (130 h) in an electric field with a frequency of 0.016 Hz. It was established that the composite films based on polyimide and graphene have good biocompatibility and are not toxic to fibroblast cells. It was shown that preliminary electrical stimulation increases the proliferative activity of human dermal fibroblasts in comparison with intact cells. It is revealed that an electric field with a strength E = 0.02–0.04 V/m applied to the polyimide films containing 0.5–3.0 wt.% of the graphene nanoparticles activates cellular processes (adhesion, proliferation).

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FRET‐Amplified Singlet Oxygen Generation by Nanocomposites Comprising Ternary AgInS₂/ZnS Quantum Dots and Molecular Photosensitizers

Oskolkova,

Matiushkina,

Borodina

et al. 2024

ChemNanoMat

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Antibacterial photodynamic therapy (a‐PDT) has emerged as a promising non‐invasive therapeutic modality that utilizes the combination of a photosensitive agent, molecular oxygen, and excitation light to generate reactive oxygen species (ROS), demonstrating remarkable activity against multidrug‐resistant bacterial infections. However, the effective use of conventional photosensitizers is significantly limited by a number of their shortcomings, namely, poor water solubility and low selectivity. Herein, we present a novel biocompatible water‐soluble nanocomposite based on hydrophobic tetraphenylporphyrin (TPP) molecules and hydrophilic ternary AgInS2/ZnS quantum dots incorporated into a chitosan matrix as an improved photosensitizer for a‐PDT. We demonstrated that TPP molecules could be successfully transferred into chitosan solution while remaining primarily in the form of monomers, which are capable of singlet oxygen generation. We performed a detailed analysis of the Förster resonance energy transfer (FRET) between quantum dots and TPP molecules within the nanocomposite and proposed the mechanism of the singlet oxygen efficiency enhancement via FRET.

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Characterization, optical, and electrical properties of chitosan/polyacrylamide blend doped silver nanoparticles

Cited by 30 publications

References 47 publications

Biosynthesized Silver Nanoparticles Encapsulated in a Poly(vinyl alcohol) Matrix: Dielectric and Structural Properties

Biosynthesized Silver Nanoparticles Encapsulated in a Poly(vinyl alcohol) Matrix: Dielectric and Structural Properties

Influence of Electric Field on Proliferation Activity of Human Dermal Fibroblasts

FRET‐Amplified Singlet Oxygen Generation by Nanocomposites Comprising Ternary AgInS₂/ZnS Quantum Dots and Molecular Photosensitizers

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Characterization, optical, and electrical properties of chitosan/polyacrylamide blend doped silver nanoparticles

Cited by 30 publications

References 47 publications

Biosynthesized Silver Nanoparticles Encapsulated in a Poly(vinyl alcohol) Matrix: Dielectric and Structural Properties

Biosynthesized Silver Nanoparticles Encapsulated in a Poly(vinyl alcohol) Matrix: Dielectric and Structural Properties

Influence of Electric Field on Proliferation Activity of Human Dermal Fibroblasts

FRET‐Amplified Singlet Oxygen Generation by Nanocomposites Comprising Ternary AgInS2/ZnS Quantum Dots and Molecular Photosensitizers

Contact Info

Product

Resources

About

FRET‐Amplified Singlet Oxygen Generation by Nanocomposites Comprising Ternary AgInS₂/ZnS Quantum Dots and Molecular Photosensitizers