Crystalline and amorphous phase identification from the tanδ relaxation peaks and impedance plots in polymer blend electrolytes based on [CS:AgNt]x:PEO(x-1) (10 ≤ x ≤ 50)

Aziz, Shujahadeen B.; Abdullah, Ranjdar M.

doi:10.1016/j.electacta.2018.07.233

Cited by 131 publications

(100 citation statements)

References 71 publications

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“…e present work revealed that the OM technique has shown a powerful ability to observe the structural change which occurs in polymer composites and polymer blend systems [3,13,29]. It also revealed that the OM technique is capable of detecting the neutral silver particles in chitosan-based polymer electrolytes via the appearance of brilliant white spots or white chains on the polymer surface [3,13]. e close inspection at adjusted magnification (274.3) indicates that the spherulites due to amorphous phase cover the surface and small brilliant regions ascribed to the crystalline area also appeared.…”

Section: Morphological Studymentioning

confidence: 78%

“…e dark regions are attributed to amorphous phases, whereas the radiant phases or spherulites relate to crystalline areas [13].…”

Section: Morphological Studymentioning

confidence: 99%

“…Interestingly, at 15 wt.% POZ, the dark regions and distinguishable brilliant phases ascribed to amorphous and crystalline phases appear. To identify, the OM technique has been used to observe the crystalline and amorphous phases in PEO-based composites [13]. From the earlier studies, the brilliant spherulites are due to the crystalline structure, and the dark regions correspond to the amorphous phase.…”

Section: Morphological Studymentioning

confidence: 99%

“…It is well documented that nonbiodegradable hydrophilic and water-soluble polymers such as poly(-ethy1ene oxide) (PEO) or poly(viny1 alcohol) (PVA) have sufficient compatibility with natural or biopolymers [8]. To pinpoint, a number of blended polymers that are based on natural chitosan such as chitosan:poly-D,L-lactide-co-glycoside (CS:PLGA) [2], CS:PVA [12], and CS:PEO [8,13], chitosan: hydroxypropyl methylcellulose (CS:HPMC) [14], chitosan:cellulose (CS:C) [15] have been reported in the literature. Recently, Abilova et al [16] have studied the chitosan/poly(2-ethyl-2-oxazoline) films in favor of ocular drug delivery.…”

Section: Introductionmentioning

confidence: 99%

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Design of Polymer Blends Based on Chitosan:POZ with Improved Dielectric Constant for Application in Polymer Electrolytes and Flexible Electronics

Aziz

Hamsan

Kadir

et al. 2020

Advances in Polymer Technology

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There is a considerable demand for the development and application of polymer materials in the flexible electronic- and polymer-based electrolyte technologies. Chitosan (CS) and poly(2-ethyl-2-oxazoline) (POZ) materials were blended with different ratios to obtain CS:POZ blend films using a straightforward solution cast technique. The work was involved a range of characteristic techniques, such as impedance spectroscopy, X-ray diffraction (XRD), and optical microscopy. From the XRD spectra, an enhancement in the amorphous nature in CS:POZ blend films was revealed when compared to the pure state of CS. The enhancement was verified from the peak broadening in CS:POZ blend films in relative to the one in crystalline peaks of the CS polymer. The optical micrograph study was used to designate the amorphous and crystalline regions by assigning dark and brilliant phases, respectively. Upon increasing POZ concentration, the dielectric constant was found to increase up to ɛ′ = 6.48 (at 1 MHz) at 15 wt.% of POZ, and then a drop was observed beyond this amount. The relatively high dielectric constant and dielectric loss were found at elevated temperatures. The increase of POZ concentration up to 45 wt.% made the loss tangent to shift to the lower frequency side, which is related to increasing resistivity. The increases of dielectric constant and dielectric loss with temperature were attributed to the increase of polarisation. The loss tangent peaks were found to shift to the higher frequency side as temperature elevated. Obvious relaxation peaks were observed in the imaginary part of electric modulus, and no peaks were found in the dielectric loss spectra. The concentration dependent of M″ peaks was found to follow the same trend of loss tangent peaks versus POZ content. The relaxation process was studied in terms of electric modulus parameters.

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Section: Morphological Studymentioning

confidence: 78%

“…e dark regions are attributed to amorphous phases, whereas the radiant phases or spherulites relate to crystalline areas [13].…”

Section: Morphological Studymentioning

confidence: 99%

Section: Morphological Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of Polymer Blends Based on Chitosan:POZ with Improved Dielectric Constant for Application in Polymer Electrolytes and Flexible Electronics

Aziz

Hamsan

Kadir

et al. 2020

Advances in Polymer Technology

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“…The data acquired for impedance at different polarisation potentials in Figure 8b were fitted to an electrical equivalent circuit (EEC) involving a two Randle's circuits in series with Warburg impedance. EEC is a straight method to represent the behaviour of the medium with circuit elements, thus understanding the electrical properties of the system under study [30,31].From the data analysis, when applying a potential of +0.8 V, the film capacitance was found to be 4.9 × 10 −6 F·cm −2 , assuming a dielectric constant of 8.0; the thickness of the film was estimated to be 1.4 µm [32]. This is about an order of magnitude more than expected from the films formed in aqueous media.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

The Anodic Behaviour of Bulk Copper in Ethaline and 1-Butyl-3-Methylimidazolium Chloride

et al. 2019

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The anodic dissolution of bulk metallic copper was conducted in ionic liquids (ILs)-a deep eutectic solvent (DES) ((CH 3 ) 3 NC 2 H 4 OH) comprised of a 1:2 molar ratio mixture of choline chloride Cl (ChCl), and ethylene glycol (EG)-and imidazolium-based ILs, such as C 4 mimCl, using electrochemical techniques, such as cyclic voltammetry, anodic linear sweep voltammetry, and chronopotentiometry.To investigate the electrochemical dissolution mechanism, electrochemical impedance spectroscopy (EIS) was used. In addition to spectroscopic techniques, for instance, UV-visible spectroscopy, microscopic techniques, such as atomic force microscopy (AFM), were used. The significant industrial importance of metallic copper has motivated several research groups to deal with such an invaluable metal. It was confirmed that the speciation of dissolved copper from the bulk phase at the interface region is [CuCl 3 ] − and [CuCl 4 ] 2− in such chloride-rich media, and the EG determine the structure of the interfacial region in the electrochemical dissolution process. A super-saturated solution was produced at the electrode/solution interface and CuCl 2 was deposited on the metal surface.Gu et al. studied electrodeposition and the corrosion behaviour of copper in a choline chloride-ethylene glycol DES. In the electrodeposition process, a rough surface was obtained with the addition of ethylene diamine; the corrosion decreased and a relatively uniform surface was gained [5]. Many research groups have tried to deal with the physical properties of ethaline (choline chloride-ethylene glycol). it was found that the mass transport could be increased with an increasing temperature; when the temperature was increased to 50 • C, the viscosity decreased by 65% [7]. Concerning the physical properties of the electrolyte, such as conductivity and viscosity, it was found that it is insensitive to metal-salt addition but strongly temperature dependent [9]. The speciation of copper is well-defined in choline-based DESs. It was determined to be [CuCl 3 ] 2− and [CuCl 4 ] 2− for Cu(I) and Cu(II), respectively [20]. The dissolution of bulk copper was studied previously in these media, in the present work attempt was directed to deal with copper in more detail [21]. Deep eutectic solvents (DESs) are attracting significant research interest as electrochemical media, especially for electrodeposition, as they share many of the useful properties of ILs, but are typically greener and cheaper [22]. The influence of water and the changing potential on the interfacial region between a platinum electrode and a DES were studied. It was found that the nanostructural feature of interface decreased in the presence of small amount of water and was also strongly potential dependent [23].The aim of this work is to investigate the dissolution mechanism of copper in a DES and its comparable IL and compare it to the aqueous system. This is important for counter-electrode processes during electrodeposition, for electropolishing, and also to understand whether metallic co...

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Mechanical properties of polyvinylpyrrolidone/polyvinyl alcohol‐based solid electrolytes

Orisekeh

Anye

Oyewole

et al. 2022

J of Applied Polymer Sci

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The demand for flexible, lightweight, and long-lasting energy devices has stimulated interest in solid polymer blends. The conventional lithium-ion batteries use liquid electrolytes that are chemically unstable due to the presence of carbonates, which are highly volatile and flammable, creating a significant safety risk. Therefore, the need for the development of solid-state electrolytes that are safe, environmentally friendly, with robust mechanical properties. In this work, the solid polymer blend is explored using a mixture of a polymer matrix of polyvinylpyrrolidone/polyvinyl alcohol and lithium perchlorate salt. The produced films are characterized using a scanning electron microscopy, X-ray diffraction, and Fourier transform infrared. The mechanical properties of the flexible films are also measured using nanoindentation techniques, statistical deconvolution mapping, tensile tests, and fracture toughness measurements. (Young's modulus of 6.87 GPa, hardness of 1.3 GPa, tensile strength of 4.3 MPa, and fracture toughness of 0.81 MPa.m 0.5 ) The implications of the results are then discussed for potential applications of robust solid polymer blends-based electrolytes.

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Crystalline and amorphous phase identification from the tanδ relaxation peaks and impedance plots in polymer blend electrolytes based on [CS:AgNt]x:PEO(x-1) (10 ≤ x ≤ 50)

Cited by 131 publications

References 71 publications

Design of Polymer Blends Based on Chitosan:POZ with Improved Dielectric Constant for Application in Polymer Electrolytes and Flexible Electronics

Design of Polymer Blends Based on Chitosan:POZ with Improved Dielectric Constant for Application in Polymer Electrolytes and Flexible Electronics

The Anodic Behaviour of Bulk Copper in Ethaline and 1-Butyl-3-Methylimidazolium Chloride

Mechanical properties of polyvinylpyrrolidone/polyvinyl alcohol‐based solid electrolytes

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