Article
Engineering, Environmental
Khaled Charradi, Mourad Chemek, Bechir Slimi, Ahmed M. M. Ramadan, Abdullah Y. A. Alzahrani, Radhouane Chtourou, Sherif M. A. S. Keshk
Summary: Conductive and optically tunable polyvalent metals chloride-loaded oxidized polyvinyl alcohol (OPVA) hybrid films were fabricated. Aluminum chloride/OPVA hybrids exhibited better electrical and optical absorption properties compared to cuprous and cobalt chlorides. The proton conductivity of the hybrid films depended on the ionic radii of the incorporated cations. Additionally, doped cations improved the performance of OPVA film for different optoelectronics applications.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2023)
Article
Polymer Science
Wafa A. A. Bawazir, Qana A. A. Alsulami, Sherif M. A. S. Keshk
Summary: In this study, the proton conductivity of poly(vinyl alcohol) (PVA) was enhanced by crosslinking polyvinyl pyrrolidone (PVP) with PVA, forming polyvinyl ketal (PVKL), without using any crosslinkers. Characterization techniques such as FT-IR, H-1-NMR, XRD, and TGA were employed. The PVKL film exhibited excellent water uptake ability and a proton conductivity of 100 mS cm(-1) at 110 degrees C. The increased proton conductivity of the PVKL film was attributed to the larger charge carrier concentration due to ketal ring formation. These findings suggest that the PVKL film has a longer lifespan and excellent proton conductivity, making it potentially useful in various optoelectronic applications.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Engineering, Environmental
Hassan G. El Gohary, Talal F. Qahtan, Huda G. Alharbi, G. M. Asnag, A. L. Waly
Summary: In this study, a polyvinyl alcohol/sodium alginate (PVA/SA) blend was used as a matrix material for creating nanocomposites with copper nanoparticles (Cu NPs) and zinc oxide nanorods (ZnO NRs) as hybrid nanofillers. The addition of nanofillers enhanced the optical and thermal properties of the blend, as evidenced by X-ray diffraction (XRD), Fourier transform infrared (FTIR), and UV-Vis spectra analysis. The impedance spectroscopic study also confirmed the improvement in alternating current (AC) conductivity, and the presence of nanofillers created 3-D channels for increased movement of charge carriers.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2023)
Article
Engineering, Electrical & Electronic
V. Sanjay, K. M. Rajashekara, Vinayak Pattar, M. V. Murugendrappa
Summary: This study evaluates the electrical and dielectric properties of poly (vinyl alcohol)-tellurium (PVA-Te) nano-composite films. The dispersion and functional groups were characterized using X-ray diffraction and Fourier transmission infrared-attenuated total reflection spectroscopic studies. The surface morphology was studied using scanning electron microscope and high-resolution-transmission electron microscope. These composites show potential applications in microwave and microelectronic industries.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Polymer Science
Zhiwei Wang, Hao Zheng, Jinyao Chen, Wei Wang, Furui Sun, Ya Cao
Summary: In this research, we investigated the relationship between the structural attributes of crosslinked PVA membranes and their properties for fuel cell applications. We found that the concentration of the crosslinking agent and the crosslinking temperature had a significant impact on the degree of crosslinking and crystallinity. The properties and structural attributes of the PVA membranes underwent coherent modifications under different crosslinking conditions.
Article
Engineering, Environmental
K. Meera, K. Arun, M. T. Ramesan
Summary: Biopolymer nanocomposite films were prepared by blending polyvinyl alcohol (PVA) and cashew gum (CG) with various concentrations of nanochitosan (nCS) using the green solution casting method. The effects of nCS on the structural, morphological, mechanical, thermal, and electrical/dielectric characteristics of the blend were investigated. The study found that the addition of nCS affected the absorption peaks, crystallinity, distribution, glass transition temperature, thermal stability, electrical conductivity, and dielectric properties of the PVA/CG blend. The blend nanocomposite films exhibited semiconducting behavior and improved tensile strength compared to the pure blend.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2023)
Article
Chemistry, Physical
S. Nasri, R. Mendil, A. Oueslati
Summary: This study investigates the physical properties of the sodium diphosphate epsilon-Na4P2O7 ceramic using X-ray diffraction, morphology, dielectric, and electrical measurements. The compound is found to crystallize in an orthorhombic structure and exhibits AC conductivity and dielectric relaxation. The behavior of the AC conductivity as a function of temperature is well explained by the correlated barrier hopping (CBH) model, and the correlation between electrical and structural properties is discussed. Furthermore, the results suggest that sodium diphosphate epsilon-Na4P2O7 could be a promising cathode material for sodium-ion batteries.
Article
Chemistry, Physical
Tyler Cosby, Christopher D. Stachurski, Robert A. Mantz, Paul C. Trulove, David P. Durkin
Summary: Ion dynamics and charge transport in various ionic liquids are investigated using multiple techniques. The study reveals an anion and temperature-dependent separation of molecular relaxation rates, showcasing significant heterogeneity in the local ion dynamics. The degree of dynamic heterogeneity correlates with the strengths of slow dielectric and mechanical relaxations, indicating the influence of mesoscale solvophobic aggregates. This correlation provides a new insight into the transport properties of ionic liquids.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Biochemistry & Molecular Biology
Sunil Chauhan, Ankit Kumar, Soumya Pandit, Anusha Vempaty, Manoj Kumar, Bhim Sen Thapa, Nishant Rai, Shaik Gouse Peera
Summary: The current study investigated the development and application of lithium-doped zinc oxide impregnated polyvinyl alcohol proton exchange membrane separator in a single-chambered microbial fuel cell. Physiochemical analysis was performed to characterize the synthesized Li-doped ZnO. The optimized PVA-ZnO-Li separator showed higher power generation and improved proton conductivity in the MFC.
Article
Materials Science, Multidisciplinary
A. Y. Yassin
Summary: By blending LiClO4 filler with PVA/PVP host matrix, the structural, thermal, and dielectric properties of the prepared composite material were improved, making it suitable for manufacturing lithium polymer batteries and high-performance energy storage devices.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Chemical
Ke Liu, Xiaoqing Wei, Shu Hu, Qingquan Li, Weimin Gao, Dan Wu, Quantong Che
Summary: Carbon dots (CDs) were used to construct high temperature proton exchange membranes with multilayered microstructures, facilitating proton conduction. The CDs provided anchor points for phosphoric acid (PA) molecules, and the PVC nanofibers guided the proton conduction behavior. The presence of hydrophilic oxygenated functional groups surrounding the CDs also improved proton conduction. The (PVC/CDs/PVC)es/PA membrane showed higher proton conductivity compared to the PVC/CDs/PA membrane. Notably, the mechanical strength of the PA doped membrane was retained without microstructure expansion. Evaluation: 8/10.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Physical
A. V. Shlyakhtina, N. V. Lyskov, I. V. Kolbanev, A. N. Shchegolikhin, O. K. Karyagina, L. G. Shcherbakova
Summary: The study focused on the structure and proton conductivity of rhombohedral La6-xMoO12-delta (x = 0.5, 0.6, 0.7, 1) lanthanum molybdates produced by mechanical activation and thermal annealing. It was found that an increase in molybdenum concentration in the La6-xMoO12-delta series led to a decrease in both rhombohedral distortion and proton conductivity. The optimal composition of La6-xMoO12-delta (x = 0.5) exhibited a proton conductivity of approximately 4.0 x 10(-5) S/cm at 500 degrees C in wet air.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Polymer Science
Tarek Dayyoub, Aleksey Maksimkin, Dmitry I. Larionov, Olga V. Filippova, Dmitry V. Telyshev, Alexander Yu. Gerasimenko
Summary: In this article, a new approach to activate PVA hydrogels by applying an AC voltage is proposed. The proposed approach involves an activation mechanism in which the actuators undergo extension/contraction cycles due to the local vibration of ions, resulting in the swelling of the hydrogels. Two types of linear actuators based on PVA hydrogels were prepared and studied, showing high extension/contraction performance and activation force. These developed actuators have broad applications in medicine, soft robotics, the aerospace industry, and artificial muscles.
Article
Nanoscience & Nanotechnology
Xinglong Pan, Michael G. Debije, Albert P. H. J. Schenning, Cees W. M. Bastiaansen
Summary: This study prepared high thermal conductivity polymer composite materials using water-soluble PVA and dispersible GO, with the help of a co-additive to improve dispersion and thermal conductivity. The hydrogen bonding between GO and PVA, along with the alignment in composite films, contributed to the improved thermal conductivity. This work offers a new method for preparing water-processable polymer composite films with high thermal conductivity, potentially useful for thermal management applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
R. Jansi, Boligarla Vinay, M. S. Revathy, P. Sasikumar, Mohamed Abbas
Summary: PVA: NaAlg: NH4NO3 polymer composites with the highest conductivity of 1.05 x 10-6 S cm-1 were synthesized by solution casting technique. The ionic conductivity of the electrolytes followed a non-debye type temperature dependent behavior. Results of CV and LSV studies confirmed the feasibility of the electrolyte for electrochemical applications.
JOURNAL OF SAUDI CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
B. Saravanakumar, S. P. Ramachandran, G. Ravi, V. Ganesh, A. Sakunthala, R. Yuvakkumar
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2019)
Article
Chemistry, Inorganic & Nuclear
Manjula R. Shenoy, Sakunthala Ayyasamy, Mogalahalli VenkateshReddy Venkatashamy Reddy, Kadarkarai Govindan, T. Saravanakumar, T. Selvaraju, Arout Chelvane Jeyaramane, Stefan Adams
SOLID STATE SCIENCES
(2019)
Article
Chemistry, Physical
I Sheebha, Vanisree Venugopal, Judy James, V Maheskumar, A. Sakunthala, B. Vidhya
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Chemistry, Physical
Ashwini Swaminathan, Ranjithkumar Ravi, M. Sasikumar, Mahadevaiah Dasaiah, G. Hirankumar, Sakunthala Ayyasamy
Article
Engineering, Electrical & Electronic
Manjula R. Shenoy, Sakunthala Ayyasamy, Mogalahalli VenkateshReddy Venkatashamy Reddy, Govindan Kadarkarai, J. Suryakanth, Saravanakumar Tamilarasan, Selvaraju Thangavelu, Arout Chelvane Jeyaramane
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2020)
Article
Engineering, Electrical & Electronic
Manjula R. Shenoy, Sakunthala Ayyasamy, Vidhya Bhojan, Rajesh Swaminathan, Nandhakumar Raju, P. Senthil Kumar, M. Sasikumar, Govindan Kadarkarai, Saravanakumar Tamilarasan, Selvaraju Thangavelu, J. Suryakanth, M. V. Reddy
Summary: The study investigates the efficiency of alpha-Fe2O3/hBN composite in degrading methylene blue under visible light, with emphasis on the impact of different weight percentages of hBN on photocatalytic performance. Results show that the addition of 5% hBN to alpha-Fe2O3 composite enhances the degradation efficiency and reaction rate.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Rojin Varghese, V. Shobin Vijay, S. Rajesh, A. Sakunthala, P. Senthil Kumar, Raman Sankar
Article
Materials Science, Multidisciplinary
V. Shobin Vijay, Rojin Varghese, A. Sakunthala, S. Rajesh, B. Vidhya
Summary: Vanadium oxide thin films were deposited on stainless steel substrates at different temperatures using pulsed laser deposition technique. The effect of post-annealing on the crystallization of V2O5 film was studied, showing a positive impact on crystallization. The structural and morphological properties were analyzed using XRD, Raman, and SEM, revealing changes in phase orientations and tunable morphological growth. The prepared thin films have potential applications in energy storage devices.
Article
Engineering, Electrical & Electronic
A. Banu, B. Filip Jones, V Muthuraj, Kadarkarai Govindan, P. Senthil Kumar, M. Sasikumar, M. Thamilselvan, B. Vidhya, S. Rajesh, A. Sakunthala
Summary: The study investigates the high photocatalytic degradation efficiency of MgNi0.5Mn1.5O4 compound doped with nickel for norfloxacin under UV-Vis light, attributed to a higher number of oxygen vacancies, increased light absorption, and better charge separation retention characteristics. The compound exhibits a high rate constant value and reusability up to four cycles, making it a promising candidate for efficient wastewater treatment through photocatalysis.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Electrochemistry
Arunkumar Dorai, Junichi Kawamura, Takahisa Omata
Summary: Lithium-sulfur batteries have the highest theoretical energy density but face challenges such as rapid degradation due to the dissolution of intermediate polysulfides. This study used NMR and MRI techniques to visualize the dissolution process and identified the origin of MRI signal enhancement as the formation of paramagnetic radicals in the dissolved polysulfides.
ELECTROCHEMISTRY COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
R. Ranjithkumar, J. Deepak Rosario, Rajesh Swaminathan, Nandhakumar Raju, Vidhya Bhojan, Sakunthala Ayyasamy
Summary: The electroadhesive actuators were created using Cu-Ni fabric electrodes and hBN-incorporated BaTiO3 dielectric composite materials in PVdF-HFP matrix as the electroadhesive tape. The electroadhesive performance of the tape was tested with different weight percentages of ball-milled hBN. The load bearing capacity increased from 100 to 950 gm for a voltage of 250 V. The dielectric behavior of the tape was analyzed using an impedance analyzer, and XRD and SEM studies were performed to understand the behavior of the powder composites embedded in the tape.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Physics, Applied
O. Sreejith, Arunkumar Dorai, Junichi Kawamura, Murugan Ramaswamy
Summary: Adapting lithium titanate as a negative electrode for lithium-ion batteries leads to safe and long-lasting battery technology, especially for electric vehicles. However, the poor conductivity and lithium-ion diffusion of lithium titanate need to be addressed for widespread use in next-generation E-mobility.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Inorganic & Nuclear
S. Pavithra, S. P. Keerthana, R. Yuvakumar, P. Senthil Kumar, S. Rajesh, B. Vidhya, A. Sakunthala
Summary: In this study, iron oxide (beta-FeOOH) nanoparticles with a narrow size distribution were prepared using a simple precipitation method assisted by ultrasound. The nanoparticles exhibited excellent electrochemical performance.
INORGANIC AND NANO-METAL CHEMISTRY
(2023)
Article
Physics, Multidisciplinary
Ashwini Swaminathan, Biswadeep Ray, Rajesh Swaminathan, Vidhya Bhojan, Nandha Kumar Raju, Sakunthala Ayyasamy
Summary: CuO microspheres were successfully prepared using hydrothermal route with P123 as capping agent. The material exhibited monoclinic crystal structure and pseudo-capacitance properties, and showed non-toxicity in cytotoxicity studies.
INDIAN JOURNAL OF PURE & APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Hirankumar Gurusamy, Sakunthala Ayyasamy, Daries Bella
Summary: The study explored a non-aqueous electrolyte system with LiNfO as the salt and PC, DME as the solvent for lithium battery applications, showing high ionic conductivity and potential window stability, with fabricated lithium ion cells exhibiting high specific discharge capacity. The potential advantages of the proposed NALE are discussed in detail.
MATERIA-RIO DE JANEIRO
(2022)
