Study the effect of acetic acid on structural, optical and mechanical properties of PVA/chitosan/MWCNT films

Abdolrahimi, Maryam; Seifi, Majid; Ramezanzadeh, Mohammad

doi:10.1016/j.cjph.2017.12.018

Cited by 49 publications

(17 citation statements)

References 20 publications

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“…In addition, the wide peaks at 3200–3600 cm −1 indicated the presence of hydrogen-bonded hydroxyl groups of PVA in BP/PVA membrane 55 . Moreover, the peaks at 2840–2920 cm −1 correspond to the stretching C-O bond, which represents the CH 2 groups of PVA 56 . This suggests that the structures of PVA and MWCNTs backbones were retained even after enzyme immobilization.…”

Section: Resultsmentioning

confidence: 99%

Immobilization of Peroxidase on Functionalized MWCNTs-Buckypaper/Polyvinyl alcohol Nanocomposite Membrane

Jun

Mubarak

Yon

et al. 2019

Sci Rep

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Surface modified Multi-walled carbon nanotubes (MWCNTs) Buckypaper/Polyvinyl Alcohol (BP/PVA) composite membrane was synthesized and utilized as support material for immobilization of Jicama peroxidase (JP). JP was successfully immobilized on the BP/PVA membrane via covalent bonding by using glutaraldehyde. The immobilization efficiency was optimized using response surface methodology (RSM) with the face-centered central composite design (FCCCD) model. The optimum enzyme immobilization efficiency was achieved at pH 6, with initial enzyme loading of 0.13 U/mL and immobilization time of 130 min. The results of BP/PVA membrane showed excellent performance in immobilization of JP with high enzyme loading of 217 mg/g and immobilization efficiency of 81.74%. The immobilized system exhibited significantly improved operational stability under various parameters, such as pH, temperature, thermal and storage stabilities when compared with free enzyme. The effective binding of peroxidase on the surface of the BP/PVA membrane was evaluated and confirmed by Field emission scanning electron microscopy (FESEM) coupled with Energy Dispersive X-Ray Spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR) and Thermogravimetric Analysis (TGA). This work reports the characterization results and performances of the surface modified BP/PVA membrane for peroxidase immobilization. The superior properties of JP-immobilized BP/PVA membrane make it promising new-generation nanomaterials for industrial applications.

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Section: Resultsmentioning

confidence: 99%

Immobilization of Peroxidase on Functionalized MWCNTs-Buckypaper/Polyvinyl alcohol Nanocomposite Membrane

Jun

Mubarak

Yon

et al. 2019

Sci Rep

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“…π* transition resulting from unsaturated bonds of -CO(CH 3 ) groups in un-hydrolyzed poly (vinyl acetate). 30,31 Herein, the PAD film also shows the light absorbance in UV regions (200-220 nm and 250-280 nm) (Figure 3). The agarose and D-glucose did not absorb radiation in scanned wavelength (Figure S1) because they only possess a single bond.…”

Section: Characterization Of Blend Coating Filmsmentioning

confidence: 95%

Polyvinyl alcohol based functional coating incorporated with Sonneratia ovata extract: Preparation, characterization, and banana preservation

Pham

Thương

et al. 2022

J of Applied Polymer Sci

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The present work aims to develop active and biodegradable coating from polyvinyl alcohol (PVOH), agarose, and D‐glucose combined with Sonneratia ovata leaf extract (SO) for prolonging the shelf life of Grande Naine banana. In addition, the PVOH/agarose/D‐glucose/SO coating films were prepared through solvent evaporation method before applying it to banana for the purpose of characterizing vital properties required for food packaging materials. Our findings showed that the addition of SO in the polymer blend based on PVOH/agarose/D‐glucose (PAD) imparts outstanding flexibility, UV‐barrier, antioxidant, and bactericidal properties of the resultant film. It was also found that the modified coatings with SO could prolong the shelf life of bananas up to day 6th storage at 25°C. The visual appearance, development of peel color, weight loss, total soluble sugar content, and pH of banana samples confirmed that PAD‐SO coating could prevent ripening of bananas during the storage period as compared to uncoated and PAD‐coated fruits. These results suggest that PAD‐SO active coatings are a promisingly potential material for extending the shelf life of fruits.

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“…PVA/CS/MWCNT system containing different proportions of acetic acid was investigated by Abdolrahimi et al and they showed that the optical direct band gap energies of the biocomposites decreased from 5.58 eV to 4.47 eV. 5 In another study, it was determined that the direct band gap energy value was decreased from 5.81 eV to 3.68 eV and the indirect band gap energy value was decreased from 4.97 eV to 3.68 for PVA/CS/Selenium composite system. 45 Figure 10 shows that the surface conductivities (r) of the biocomposites increases in parallel with the decrease in the optical band gap energies.…”

Section: Optical Band Gap Energy Determinationmentioning

confidence: 99%

“…2,3 Due to the presence of hydroxyl groups, it is soluble in water over a wide temperature range, sensitive to moisture, and has the good film-forming ability. 4,5 Biocompatible, and biodegradable this polymer has an environmentally friendly character. 4,6,7 PVA has excellent barrier properties against oils, fats, flavors, and small gas molecules, but must be protected against moisture to prevent its permeability against gases.…”

Section: Introductionmentioning

confidence: 99%

Effect of MWCNT addition on the optical band gap of PVA/CS transient biocomposites

Mergen

2021

Journal of Composite Materials

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In recent years, as a result of increasing environmental concerns, biodegradable materials have gained great attention. With the rapid development of electronic technology, the importance of innovation and development of low-cost, sustainable, transient bioelectronics materials is increasing. In this research, the preparation of Poly(Vinyl Alcohol) (PVA), Chitosan (CS), and Multi-Walled Carbon nanotube (MWCNT) biocomposite films have been described. The solution mixing, ultrasonic mixing, and spin coating techniques were used to prepare the PVA/CS/MWCNT biocomposite thin films. UV–Vis absorption spectroscopy and two-point probe resistivity measurement techniques were used to study the optical and electrical properties of the biocomposite thin films. Optical band gap energies ( Eg) of PVA/CS/MWCNT biocomposites were obtained using the Tauc and Absorbance Spectrum Fitting (ASF) methods. Results obtained with both methods were found to be exactly the same. Experimental results have shown that with increasing MWCNT concentration, electrical conductivity (σ) increases from 1.75x10−16 S to 2.94x10−3 S, and Eg decreases significantly. At the same time, the fundamental optical parameters such as band tail (Urbach) energy ( Eu), refractive index ( n), absorption ( α), and extinction ( k) coefficient of the PVA/CS/MWCNT biocomposites were investigated in the UV-VIS range. The improvement observed in the optical and electrical properties of PVA/CS/MWCNT biocomposite films shows that these composites could be used as bioelectronics materials.

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Study the effect of acetic acid on structural, optical and mechanical properties of PVA/chitosan/MWCNT films

Cited by 49 publications

References 20 publications

Immobilization of Peroxidase on Functionalized MWCNTs-Buckypaper/Polyvinyl alcohol Nanocomposite Membrane

Immobilization of Peroxidase on Functionalized MWCNTs-Buckypaper/Polyvinyl alcohol Nanocomposite Membrane

Polyvinyl alcohol based functional coating incorporated with Sonneratia ovata extract: Preparation, characterization, and banana preservation

Effect of MWCNT addition on the optical band gap of PVA/CS transient biocomposites

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