Poly(vinyl alcohol)/carbon nanotube nanocomposites

Mallakpour, Shadpour; Rashidimoghadam, Shima

doi:10.1016/b978-0-08-100970-3.00010-9

Cited by 11 publications

(4 citation statements)

References 47 publications

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“…Thus, with increasing NADES/Sp extract content in the emulsions used in the electrospinning, the FTIR spectrum showed similarities to glycerol. The same was also observed in the W 50/50 nanofibers, since OH stretching decreased from 3300 to 3280 cm −1 ; this might also be linked to the ability of the water molecules to form hydrogen bonds with PVA [ 33 ].…”

Section: Resultsmentioning

confidence: 64%

“…In this study, PVA was the polymer used to form emulsions with W/Sp and NADES/Sp extracts. PVA is a synthetic biodegradable polymer that possesses great mechanical properties such as semi crystallinity and high temperature stability, which are very advantageous to the electrospinning technique [ 33 , 34 ]. Additionally, when compared with other polymer options often used in the electrospinning, PVA is relatively low cost [ 34 ].…”

Section: Resultsmentioning

confidence: 99%

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Natural Deep Eutectic Solvent Extraction of Bioactive Pigments from Spirulina platensis and Electrospinning Ability Assessment

Martins

Mouro

Pontes³

et al. 2023

Polymers

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The first ever nanofibers produced by the electrospinning of polyvinyl alcohol (PVA) and Spirulina platensis extracts are presented in this article. Spirulina platensis extracts were obtained by ultrasound-assisted extraction (UAE) using two different solvents: a glucose/glycerol-based natural deep eutectic solvent (NADES) and water. Through spectrophotometry analysis, it was possible to determine the pigment yield of the extractions for both extracts: phycocyanin = 3.79 ± 0.05 mg/g of dry biomass (DB); chlorophylls = 0.24 ± 0.05 mg/g DB; carotenoids = 0.13 ± 0.03 mg/g DB for the NADES/Spirulina extracts, and phycocyanin = 0.001 ± 0.0005 mg/g DB; chlorophylls = 0.10 ± 0.05 mg/g DB; carotenoids = 0.20 ± 0.05 mg/g DB for water/Spirulina extracts. Emulsions were formed by mixing the microalgae extracts in PVA (9%, w/v) at different concentrations: 5, 20, 40, and 50% (v/v). Electrospinning was carried out at the following conditions: 13 cm of distance to collector; 80 kV of applied voltage; and 85 rpm of electrode rotation. After the nanofibers were collected, they were checked under a scanning electron microscope (SEM). ImageJ was also used to determine fiber diameter and frequency. SEM results showed the formation of nanofibers for 5 and 20% (v/v) of NADES/Spirulina extract content in the electrospinning emulsions, presenting diameters of 423.52 ± 142.61 nm and 680.54 ± 271.92 nm, respectively. FTIR confirmed the presence of the NADES extracts in the nanofibers produced. Overall, the nanofibers produced showed promising antioxidant activities, with the NADES/Spirulina- and PVA-based nanofibers displaying the highest antioxidant activity (47%). The highest antimicrobial activity (89.26%) was also obtained by the NADES/Spirulina and PVA nanofibers (20%, v/v). Principal Component Analysis (PCA) revealed positive correlations between both the antioxidant and antimicrobial activities of the electrospun nanofibers, and extract content in the emulsions. Moreover, PCA also indicated positive correlations between the viscosity and conductivity of the emulsions and the diameter of the nanofibers produced.

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Section: Resultsmentioning

confidence: 64%

Section: Resultsmentioning

confidence: 99%

Natural Deep Eutectic Solvent Extraction of Bioactive Pigments from Spirulina platensis and Electrospinning Ability Assessment

Martins

Mouro

Pontes³

et al. 2023

Polymers

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“…47 This increase in surface area allows for more contact points between the nanocomposite and the MB dye, thereby increasing adsorption capacity. 48 It is worth noting that the provided information highlights the correlation between the BET analysis results and the enhanced adsorption capacity due to the presence of MWCNTs.…”

Section: Bet Analysismentioning

confidence: 76%

Multiwalled carbon nanotubes@pectin/κ‐carrageenan‐based nanocomposite biohydrogel prepared by gamma irradiation for efficient methylene blue dye sequestration

Aboelkhir,

Sayed,

Eldondaity

et al. 2024

J of Applied Polymer Sci

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This study addresses the critical issue of removing toxic dyes from industrial wastewater to protect the environment and human health. To address this challenge, a bio‐based composite hydrogel was synthesized using gamma irradiation, 20 kGy, incorporating multiwalled carbon nanotubes@pectin/κ‐carrageenan/polyacrylic acid (MWCNTs PC/KC/PAAc) for removing methylene blue (MB) dye from aqueous solutions. The prepared composites underwent characterization through Fourier‐transform infrared spectroscopy, x‐ray diffraction, and thermogravimetric analyses. Brunauer–Emmett–Teller analysis demonstrated a significant increase in surface area upon the addition of MWCNTs. Specifically, the surface area increased from 342.5 m2 g−1 for PC/KC/PAAc to 689.5 m2 g−1 when 0.175&#x02009;wt% of MWCNTs were added. Also, scanning electron microscopy and atomic force microscopy were utilized to examine the surface topography of PC/KC/PAAc and MWCNTs@PC/KC/PAAc. The results reveal that at 0.175&#x02009;wt% of MWCNTs, there was a more uniform surface topography with well‐distributed MWCNTs within the matrix. In the adsorption study of MB dye, it was found that the highest MB removal efficiency was achieved at pH&#x02009;11, with values of 68.21% and 96% for PC/KC/PAAc and MWCNTs@PC/KC/PAAc, respectively. Furthermore, upon studying the effect of MWCNTs (%), the results showed that the removal (%) of PC/KC/PAAc was 68.21&#x02009;±&#x02009;1.02%, and this percentage increased rapidly with the addition of MWCNTs, reaching a maximum of 96&#x02009;±&#x02009;0.85% when 0.175 (wt%) of MWCNTs was added. Isotherm and kinetic modeling demonstrated that MB adsorption follows the Freundlich isotherm for PC/KC/PAAc and the Redlich–Peterson isotherm for MWCNTs@PC/KC/PAAc, both following a pseudo‐second‐order kinetics model. In addition, from AFM data, after MB removal, the height increased significantly from 322&#x02009;nm for PC/KC/PAAc to 810&#x02009;nm for MWCNTs@PC/KC/PAAc (0.175&#x02009;wt%), indicating a substantially higher adsorption of MB by MWCNTs@PC/KC/PAAc.

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“…PVA is a non-toxic, semi-crystalline, biocompatible, and biodegradable synthetic polymer. PVA is obtained by hydrolysis of polyvinyl acetate, which properties are influenced by polymerization and hydrolysis conditions [287]. This polymer has several applications, including paper coating, textile sizing, dialysis membrane, wound dressing, and artificial skin, due to its high oxygen and aroma barrier properties, high tensile strength and flexibility, excellent film forming, and adhesive properties [288].…”

Section: Synthetic Polymers As Building Blocks For Manufactured Fibersmentioning

confidence: 99%

Nanoparticle Synthesis and Their Integration into Polymer-Based Fibers for Biomedical Applications

Domingues

Miranda

Homem³

et al. 2023

Biomedicines

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The potential of nanoparticles as effective drug delivery systems combined with the versatility of fibers has led to the development of new and improved strategies to help in the diagnosis and treatment of diseases. Nanoparticles have extraordinary characteristics that are helpful in several applications, including wound dressings, microbial balance approaches, tissue regeneration, and cancer treatment. Owing to their large surface area, tailor-ability, and persistent diameter, fibers are also used for wound dressings, tissue engineering, controlled drug delivery, and protective clothing. The combination of nanoparticles with fibers has the power to generate delivery systems that have enhanced performance over the individual architectures. This review aims at illustrating the main possibilities and trends of fibers functionalized with nanoparticles, focusing on inorganic and organic nanoparticles and polymer-based fibers. Emphasis on the recent progress in the fabrication procedures of several types of nanoparticles and in the description of the most used polymers to produce fibers has been undertaken, along with the bioactivity of such alliances in several biomedical applications. To finish, future perspectives of nanoparticles incorporated within polymer-based fibers for clinical use are presented and discussed, thus showcasing relevant paths to follow for enhanced success in the field.

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Poly(vinyl alcohol)/carbon nanotube nanocomposites

Cited by 11 publications

References 47 publications

Natural Deep Eutectic Solvent Extraction of Bioactive Pigments from Spirulina platensis and Electrospinning Ability Assessment

Natural Deep Eutectic Solvent Extraction of Bioactive Pigments from Spirulina platensis and Electrospinning Ability Assessment

Multiwalled carbon nanotubes@pectin/κ‐carrageenan‐based nanocomposite biohydrogel prepared by gamma irradiation for efficient methylene blue dye sequestration

Nanoparticle Synthesis and Their Integration into Polymer-Based Fibers for Biomedical Applications

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