Synthesis, structural, thermal, optical and dielectric properties of chitosan biopolymer; influence of PVP and α-Fe2O3 Nanorods

Sayed, Adel M. El; Mohamad, Ahmad Desoky M.

doi:10.1007/s10965-018-1571-x

Cited by 54 publications

(22 citation statements)

References 56 publications

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“…A blend of PVP polymer with chitosan also gives a peak at ∼1645 cm –1 , which also shows the presence of CO bond stretching. The other peaks present at 1543, 1417, and 1065 cm –1 are due to the presence of symmetric deformation of N–H stretching, CH 2 bending, and C–O bond stretching, respectively . This result confirmed the interaction between chitosan and PVP blends present in the CHP substrate.…”

Section: Resultssupporting

confidence: 66%

Biodegradable Flexible Substrate Based on Chitosan/PVP Blend Polymer for Disposable Electronics Device Applications

2019

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To provide a more sustainable future, development and implementation of green electronics incorporating natural materials has become an essential requirement. In this study, we demonstrated a low-temperature and low-cost fabrication route to develop chitosan/PVP (CHP) substrate for flexible electronics device applications. A combination of natural polymer (chitosan) and synthetic polymer (poly(vinylpyrrolidone), PVP) has been used to fabricate biodegradable, low-cost, and flexible substrate. The CHP substrate has been prepared by the solution casting method. The CHP flexible substrate demonstrates a high optical transmittance (∼90% in the visible region), high-temperature stability (up to 250 °C), smooth surface, and good mechanical stability along with a high biodegradation rate (within 6 days) into the soil. Radio frequency (RF) sputtering and thermal evaporation techniques have been used to deposit high-quality ZnO thin films and Au/Ti electrodes over the CHP substrate. This fabricated metal–semiconductor–metal (MSM) device gives a clear indication about the accountability of the CHP polymer substrate as a potential option for flexible electronics. The current–voltage characteristic with flat and bending cycles (three flat–bending–flat cycles) shows almost same current conduction. These flexible CHP substrates can find a new way toward environmentally friendly, flexible electronics.

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Section: Resultssupporting

confidence: 66%

Biodegradable Flexible Substrate Based on Chitosan/PVP Blend Polymer for Disposable Electronics Device Applications

2019

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“…It is clear that the ϵ′ value of the films is higher at a lower frequency; in contrast, it shows a decreasing trend with increasing the frequency. The polarization that occurs in the material as a result of the movement of the charges can be shown as the cause of this behavior [32] . There can be two reasons for the high ϵ′ value at low frequency.…”

Section: Resultsmentioning

confidence: 99%

“…The polarization that occurs in the material as a result of the movement of the charges can be shown as the cause of this behavior. [32] There can be two reasons for the high ε' value at low frequency. One of them is charge accumulation from free mobile ions in the polymer/electrode interface region at low frequencies, namely interfacial polarization.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Dielectric Biodegradable Biopolymer‐Based Graphene Nanocomposites for Use in the Packaging Industry and Capacitor Application

Gürler

Torğut

2022

ChemistrySelect

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In this study, polyhydroxyalkanoate (PHA) and polylactic acid (PLA)‐Graphene (G) nanocomposite films were synthesized by taking different concentrations of G via the solution casting process, and their structural, mechanical, opacity, thermal and dielectric properties were examined for the first time. Scanning electron microscopy (SEM) was used for investigating surface morphology. Films containing graphene were more opaque than films without graphene. The incorporation of graphene into the polymer matrix improved the mechanical property. The tensile strengths of the control PHA/PLA film and the graphene‐reinforced 1 %G‐PHA/PLA nanocomposite films were 18.98 and 24.34 MPa, respectively. Thermogravimetric analysis results showed that PHA/PLA−G nanocomposites had good thermal stability below 300 °C. Considering the dielectric measurements, it is seen that the dielectric constant (έ) and dielectric loss (ϵ”) decreased with increasing frequency and less changed at higher frequencies. The developer feature of graphene is remarkable in both parameters. The electrical conductivity of PHA/PLA−G nanocomposites was also examined as a function of frequency at room temperature. As the amount of G increased from 1 %wt to 5 %wt, the conductivity of the composites increased.

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“…To the best of our knowledge, hematite has been used in a polyelectrolyte membrane as a source of an active anode material, as reported by Hikmah and co-worker [23]. El Sayed and co-worker [24] reported using hematite as an electrolyte material in the synthesis of CS with polyvinylpyrrolidone for medical and technological applications. The authors synthesized a composite membrane using different polymers, methods, and applications.…”

Section: Introductionmentioning

confidence: 93%

Synthesis and Characterization of Chitosan-Polyvinyl Alcohol-Fe2O3 Composite Membrane for DMFC Application

2020

Makara J.Sci

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This study investigates the utilization of different compositions of Fe 2 O 3 and polyvinyl alcohol (PVA) to modify chitosan in order to prepare a composite membrane. The membranes were synthesized using the phase inversion method and extensively characterized by Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), mechanical properties analysis, and water uptake analysis, whereby SEM was used to confirm the morphology of the composite membranes. Different electrochemical properties such as ion exchange capacity, proton conductivity, and methanol permeability of these membranes were also measured. The results showed that increasing the PVA mass improved the water uptake, ion exchange capacity (IEC), and proton conductivity because the PVA addition increased the hydrophilicity of the membrane; thus, the pore surface on the membrane was more open, which also caused higher membrane permeability. However, the methanol permeability values of all composite membranes were lower than that of Nafion. The highest IEC and proton conductivity were obtained for the CS-PVA-H3070 membrane, with values of 4.300 meq/g and 6.71 × 10 −2 S•cm −1 , respectively. The mechanical strength of these membranes showed that the PVA addition increased the elongation break and decreased the tensile strength of the membrane. The results imply that the chitosan membrane modified with PVA and Fe¬ 2 O 3 has a potential for DMFC applications.

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Synthesis, structural, thermal, optical and dielectric properties of chitosan biopolymer; influence of PVP and α-Fe2O3 Nanorods

Cited by 54 publications

References 56 publications

Biodegradable Flexible Substrate Based on Chitosan/PVP Blend Polymer for Disposable Electronics Device Applications

Biodegradable Flexible Substrate Based on Chitosan/PVP Blend Polymer for Disposable Electronics Device Applications

Dielectric Biodegradable Biopolymer‐Based Graphene Nanocomposites for Use in the Packaging Industry and Capacitor Application

Synthesis and Characterization of Chitosan-Polyvinyl Alcohol-Fe2O3 Composite Membrane for DMFC Application

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