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N. M. J. Rasali

Bio: N. M. J. Rasali is an academic researcher from Universiti Malaysia Pahang. The author has contributed to research in topics: Ionic conductivity & Fourier transform infrared spectroscopy. The author has an hindex of 7, co-authored 10 publications receiving 125 citations.

Papers
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Journal ArticleDOI
01 Feb 2019-Ionics
TL;DR: In this paper, the development of solid biopolymer electrolyte (SBE) system using a promising biopolymers, namely, alginate doped with various amount of ammonium nitrate (NH4NO3), was discussed.
Abstract: The present work deals with the development of solid biopolymer electrolyte (SBE) system using a promising biopolymer, namely, alginate doped with various amount of ammonium nitrate (NH4NO3). The SBE system has been successfully prepared via the solution-casting method. The Fourier transform infrared (FTIR) analysis carried out suggests that interaction has occurred between alginate and NH4NO3 via COO−. The X-ray diffraction analysis (XRD) also discloses that the addition of NH4NO3 affects the alginate SBE system by reducing the crystallinity and transforming it to an amorphous phase. The ionic conductivity of SBE system has been measured using electrical impedance spectroscopy (EIS), and it was found to achieve a maximum value of 5.56 × 10−5 S cm−1 at ambient temperature (303 K) for a sample containing 25 wt.% NH4NO3. The SBE system was found to obey the Arrhenius behavior where the system is thermally activated, and the differential scanning calorimetry (DSC) analysis demonstrated the decreased in glass transition temperature (Tg) upon the addition of the dopant. The mobility (μ) and diffusion coefficient (D) were found to affect the ionic conductivity trend as observed via IR-deconvolution approach. The alginate–NH4NO3 SBE sample with the highest conductivity has a transference number tion of 0.97 which further indicates that the conduction species is a cation.

42 citations

Journal ArticleDOI
TL;DR: In this article, a proton-conducting hybrid solid biopolymer electrolytes (HSBEs) system was successfully prepared via the solution casting approach, which was characterized to evaluate the structural and the proton conduction properties using FTIR, XRD and EIS techniques.

39 citations

Journal ArticleDOI
07 Nov 2018-Ionics
TL;DR: In this paper, the authors investigated the ionic conductivity as well as its transport properties of carboxymethyl cellulose-NH4Br plasticized with various weight percentage of glycerol for solid biopolymer electrolytes (SBEs) prepared by solution-casting technique.
Abstract: The present work investigates the ionic conductivity as well as its transport properties of carboxymethyl cellulose–NH4Br plasticized with various weight percentage of glycerol for solid biopolymer electrolytes (SBEs) prepared by solution-casting technique. It was shown from the FTIR analysis that the complexation transpires at C=O and C–O− from COO− of CMC upon the addition of glycerol into the SBEs system. The highest room temperature ionic conductivity of ~10−3 S cm−1 was achieved at 6 wt.% of glycerol owing to the broadening in the amorphous state as demonstrated in the XRD analysis. The conductivity-temperature plots were found to be in good agreement with the conventional Arrhenius relationship. It was further shown that the conducting element is mainly due to the protonation of H+ where ionic mobility and diffusion coefficient was found to contribute towards the enhancement in the ionic conductivity of SBEs system.

26 citations

Journal ArticleDOI
23 Mar 2018-Ionics
TL;DR: In this article, the ion transport properties and structural analysis of plasticized solid polymer electrolytes (SPEs) based on carboxymethyl cellulose (CMC)-NH4Br-PEG were investigated.
Abstract: The present study investigates the ion transport properties and structural analysis of plasticized solid polymer electrolytes (SPEs) based on carboxymethyl cellulose (CMC)-NH4Br-PEG. The SPE system was successfully prepared via solution casting and has been characterized by using electrical impedance spectroscopy (EIS), Fourier transform infrared (FTIR) spectroscopy, and x-ray diffraction (XRD) technique. The highest conductivity of the SPE system at ambient temperature (303 K) was found to be 1.12 × 10−4 S/cm for un-plasticized sample and 2.48 × 10−3 S cm−1 when the sample is plasticized with 8 wt% PEG. Based on FTIR analysis, it shows that interaction had occurred at O–H, C=O, and C–O moiety from CMC when PEG content was added. The ionic conductivity tabulation of SPE system was found to be influenced by transport properties and amorphous characteristics as revealed by IR deconvolution method and XRD analysis.

24 citations

Journal ArticleDOI
01 Apr 2018
TL;DR: In this article, the development of solid biopolymer electrolytes (SBEs) system which has been accomplished by incorporating various composition of ionic dopant namely ammonium bromide (NH4Br) with alginate solution casting method.
Abstract: This paper present the development of solid biopolymer electrolytes (SBEs) system which has been accomplished by incorporating various composition of ionic dopant namely ammonium bromide (NH4Br) with alginate solution casting method. The prepared sample of SBEs has been analyzed via electrical impedance spectroscopy (EIS) showed that the ionic conductivity at room temperature was increased from 4.67 x 10-7 S cm-1 for un-doped sample to optimum value at 4.41 x 10-5 S cm-1 for composition of 20 wt. % NH4Br. The SBEs system was found to obey the Arrhenius characteristics with R2~1where all sample is thermally activated when increasing temperature. The dielectric behavior of the alginate-NH4Br SBEs system were measured using complex permittivity (e*) and complex electrical modulus (M*) and shown the non-debye behavior where no single relaxation was found for present SBEs system.

22 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the carboxymethyl cellulose and polyvinyl alcohol (CMC/PVA) based hybrid polymer (HPe) system with different ratio of composition have been prepared via solution casting.
Abstract: The carboxymethyl cellulose and polyvinyl alcohol (CMC/PVA) based hybrid polymer (HPe) system with different ratio of composition have been prepared via solution casting. The features of interaction between CMC and PVA were investigated using X-ray diffraction (XRD), and infrared (IR) spectroscopy to disclose the reduction of crystallinity of the HPe system. Morphological properties observed by Scanning electron microscopy (SEM) confirmed the homogeneity of the HPe system. Differential scanning calorimetry (DSC) result explains the miscibility of the HPe system which was confirmed by means of variations in the glass transition temperature (Tg). Two degradation mechanisms were revealed by thermogravimetric analysis (TGA) in the HPe system attributed to the decarboxylation in CMC and degradation of bond scission in PVA backbone. The blend of 80:20 compositions of CMC/PVA HPe system was found to be the optimum ratio with an increase in conductivity of CMC/PVA by one magnitude order from 10−7 to 10−6 S/cm with the lowest in crystallinity.

122 citations

Journal ArticleDOI
TL;DR: In this paper, a simple chemical precipitation method was used to synthesize ZnO: Co2+ as nanoparticles and the solution casting technique was used for the preparation of polymer films of Carboxymethyl cellulose (CMC) doped with different contents (0.5, 1, 3, and 5,wt%).

63 citations

Journal ArticleDOI
25 Dec 2020
TL;DR: In this article, the structure, physico-chemical properties and various types of cellulose derivatives, as well as the different manufacturing approaches to obtain porous cellulose membranes are discussed.
Abstract: There is a growing demand for lithium ion batteries (LIBs) fabricated with environmentally-friendly materials to transition toward a more sustainable society based on a circular economy. Battery separator, typically a porous petroleum-polymer, plays a pivotal role as it serves to efficiently transfer ions between electrodes while preventing electrical short-circuits. To reduce our dependence on fossil resources, cellulose and its derivatives are being used as sustainable battery separators thanks to its easily controllable porosity, suitable mechanical and thermal properties, non-toxicity and inherent hydrophilicity. Here we first present the structure, physico-chemical properties and various types of cellulose derivatives, as well as the different manufacturing approaches to obtain porous cellulose membranes. Further, the most recent developments in the field of cellulose and its derivates for lithium ion battery separators and solid polymer electrolytes are discussed. Finally, the main issues and properties to be improved in the near future concerning cellulosic separators are shown.

56 citations

Journal ArticleDOI
TL;DR: In this paper, the FTIR analysis demonstrated the interaction between CMC-PVA and NH4Br via COO− and the optimum ionic conductivity at ambient temperature is found to be 3.21 × 10−4 S/cm for the sample containing 20% NH4br with the lowest percentage of crystallinity and total weight loss.

54 citations

Journal ArticleDOI
01 Jun 2019-Ionics
TL;DR: In this paper, the abnormal trend of electrochemical properties of solid biopolymer electrolytes (SBEs) system-based carboxymethyl cellulose (CMC) blended with polyvinyl alcohol (PVA)-doped NH4Cl was investigated.
Abstract: The present work was carried out to investigate the abnormal trend of electrochemical properties of solid biopolymer electrolytes (SBEs) system-based carboxymethyl cellulose (CMC) blended with polyvinyl alcohol (PVA)-doped NH4Cl. The SBEs system was prepared via solution casting technique and analyzed through Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), X-ray diffraction (XRD) analysis, and electrical impedance spectroscopy (EIS). Complexation was observed with the changes of peaks at 1065 cm−1, 1598 cm−1, 2912 cm−1, and 3396 cm−1 that corresponds to C–O–C, C=O of COO− stretching, C–H stretching, and O–H stretching, respectively, of CMC/PVA blend system upon the addition of NH4Cl. The decrease of the amorphousness and the increase of weight loss demonstrated the abnormal observation of the ionic conductivity when (1–5 wt%) NH4Cl was added in the SBEs system which was lower than the un-doped SBEs system. It was also observed that the highest ionic conductivity at 8.86 × 10−5 Scm−1 was achieved by the sample containing 6 wt% of NH4Cl. The temperature dependence of the SBEs system is found to be governed by the Arrhenius rule. Through the IR deconvolution technique, the conductivity of CMC/PVA-NH4Cl SBEs system was shown to be primarily influenced by the ionic mobility and diffusion coefficient of the ions.

51 citations