Protonic conductivity and thermal properties of cross-linked PVA/TiO2 nanocomposite polymer membranes

Aparicio, Gladis Miriam; Vargas, R.A.; Bueno, Paulo Agenor Alves

doi:10.1016/j.jnoncrysol.2019.119520

Cited by 28 publications

(12 citation statements)

References 30 publications

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“…This result indicates the dominant capacitive behavior of the investigated samples. It is also observed that, in the low‐frequency region, the values of Z ′( ω ) and Z ″( ω ) are in the order of few mega ohms, which propose the aptness of PVDF/LTO PNC as an electrical insulator for the standard microelectronic devices 69 …”

Section: Resultsmentioning

confidence: 94%

Structural, thermal, and dielectric properties of porous PVDF/Li₄Ti₅O₁₂ nanocomposite membranes for high‐power lithium‐polymer batteries

Nasrallah

El-Metwally

Ismail

2020

Polymers for Advanced Techs

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Polymer nanocomposites consisting of materials such as ionic polymers and nano‐ceramic fillers are widely used in high‐power lithium‐polymer batteries because of their high ionic conductivity, good mechanical strength, electrothermal stability, and better compatibility with electrodes. Nanocomposite films of polyvinylidene fluoride (PVDF)/lithium titanium oxide Li4Ti5O12 (LTO) with different volume fractions of LTO nanoparticles (NPs) are prepared via casting method. The DSC thermograms revealed a slight decrease in the melting temperature Tm and a noticeable reduction in the degree of crystallinity with increasing the volume fraction of LTO. This decrease is confirmed by the increment in the relative fraction of β‐phase in the PVDF matrix calculated from both XRD and FTIR. SEM images indicated the growth of porous globular structures in the presence of LTO NPs. Besides, the hydrophilicity of PVDF is improved by incorporating LTO NPs. The dielectric constant ε′(ω), loss ε″(ω), ac conductivity σac(ω), complex impedance Z*(ω), and Nyquist plots of PVDF/LTO nanocomposites are investigated in the temperature range from 303 to 413 K and frequency range from 100 Hz to 1 MHz. The σac(ω) and frequency exponent s are found to obey the correlated barrier hopping model. Values of the frequency exponent s and the charge carriers binding energy Wm for the studied nanocomposite films decrease with rising temperature and LTO addition. Furthermore, dielectric constant ε′(ω), loss ε″(ω), and ac electrical conductivity σac(ω) of films are found to be strongly frequency and temperature dependent. The localized states density N(EF) at the Fermi level increase with increasing temperature and LTO NPs volume fraction, resulting in the Wm decrease and the enhancement of the ac electrical conductivity σac(ω). The impedance spectrum and Nyquist plots provide an insight into the influence of LTO vol% in the resistive and capacitive characteristics of PVDF/LTO films. These results recommend the choice of LTO NPs as dopants to enhance the electrical properties of the PVDF matrix to be used in high‐power lithium‐ion batteries and electronic devices.

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Section: Resultsmentioning

confidence: 94%

Structural, thermal, and dielectric properties of porous PVDF/Li₄Ti₅O₁₂ nanocomposite membranes for high‐power lithium‐polymer batteries

Nasrallah

El-Metwally

Ismail

2020

Polymers for Advanced Techs

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“…The most commonly methods used are in situ polymerization, 1 emulsion polymerization, 2 microemulsion polymerization, 3 solution mixing, 4 sol–gel method 5 and melt blending. 6 Many researchers have reported that the incorporation of inorganic fillers into polymer matrix can significantly improve a number of desirable properties, such as mechanical strength, 7 thermal stability, 8 barrier properties, 9 and wear resistance. 10 Among the pool of nanocomposite materials available, poly(methyl methacrylate)/silica nanocomposites have recently received considerable attention because of its numerous applications and advantages in many domains like scratch resistance, 11 bioactivity, 12 antimicrobial, 13 dielectric, 14 and optical applications.…”

Section: Introductionmentioning

confidence: 99%

Poly(methyl methacrylate)/SiO₂ nanocomposites: Effects of the molecular interaction strength on thermal properties

Boulerba

Zoukel

2021

Polymers and Polymer Composites

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Poly(methyl methacrylate)/silica nanocomposites membranes were prepared by simple solution mixing method using three different solvents (acetone, acetonitrile and chloroform). The structure and thermal properties of these nanocomposites were investigated by fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and environmental scanning electron microscope (ESEM). The infrared spectra confirm that the strongest H-bond interaction between the PMMA and silica was found when using chloroform solvent. In the case of thermal properties, the DSC and TGA analyses show significant improvement in thermal stability and glass transition temperature (Tg). Furthermore, the ESEM micrographs prove the structure stability of these synthesized nanocomposites. The results demonstrate that the solvent that lead to form the strongest H-bond interaction between the PMMA carbonyl groups and silica silanol groups (as chloroform solvent) will be more efficient in the synthesis of PMMA/SiO2 nanocomposites.

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“…On the other hand, hydrogen plays an important role as a prospective cleaner fuel that facilitates energy transition [14,15]. Indeed, hydrogen technologies are becoming of increasing interest for both academics and industries due to their reliable operation as an energy carrier [16,17]. Particularly, the role of hydrogen in ICEs is intended to minimize the issues related to greenhouse emissions while maintaining thermal requirements related to the combustion phenomena [18].…”

Section: Introductionmentioning

confidence: 99%

Experimental and economic assessment of alkaline electrolyzer for dual-fuel operation in low-displacement diesel engines

Maestre-Cambronel

Hernández

Forero

2021

DYNA

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This investigation evaluated the integration of an alkaline electrolyzer for dual-fuel operation in an experimental test bench of a diesel engine from a techno-economic viewpoint. The characterization of the electrolyzer operation indicated that higher electrolyte (KOH) concentrations (30 – 40% w/w) improve the overall performance since less voltage is required for electrolysis, thus featuring higher efficiencies (50 – 60%) and hydrogen production (4 – 6 LPM). The economic analysis demonstrated that hydrogen cost remains competitive (4.3 - 5.6 USD/kg), and it is greatly dependent on the electrolyte concentration. Additionally, the operation of the engine with hydrogen injection at 20 LPM and a palm biodiesel blend reduced the fuel consumption rate between 10 – 31% depending on the load rate when compared to pure diesel. In contrast, dual-fuel operation generated a minor reduction in fuel conversion efficiency (< 5%), which reflects on the power output. Overall, this technology stands as a promising avenue to improve the fuel utilization ratio.

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Protonic conductivity and thermal properties of cross-linked PVA/TiO2 nanocomposite polymer membranes

Cited by 28 publications

References 30 publications

Structural, thermal, and dielectric properties of porous PVDF/Li₄Ti₅O₁₂ nanocomposite membranes for high‐power lithium‐polymer batteries

Structural, thermal, and dielectric properties of porous PVDF/Li₄Ti₅O₁₂ nanocomposite membranes for high‐power lithium‐polymer batteries

Poly(methyl methacrylate)/SiO₂ nanocomposites: Effects of the molecular interaction strength on thermal properties

Experimental and economic assessment of alkaline electrolyzer for dual-fuel operation in low-displacement diesel engines

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Protonic conductivity and thermal properties of cross-linked PVA/TiO2 nanocomposite polymer membranes

Cited by 28 publications

References 30 publications

Structural, thermal, and dielectric properties of porous PVDF/Li4Ti5O12 nanocomposite membranes for high‐power lithium‐polymer batteries

Structural, thermal, and dielectric properties of porous PVDF/Li4Ti5O12 nanocomposite membranes for high‐power lithium‐polymer batteries

Poly(methyl methacrylate)/SiO2 nanocomposites: Effects of the molecular interaction strength on thermal properties

Experimental and economic assessment of alkaline electrolyzer for dual-fuel operation in low-displacement diesel engines

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Structural, thermal, and dielectric properties of porous PVDF/Li₄Ti₅O₁₂ nanocomposite membranes for high‐power lithium‐polymer batteries

Structural, thermal, and dielectric properties of porous PVDF/Li₄Ti₅O₁₂ nanocomposite membranes for high‐power lithium‐polymer batteries

Poly(methyl methacrylate)/SiO₂ nanocomposites: Effects of the molecular interaction strength on thermal properties