Article
Spectroscopy
Dineshkumar Sengottuvelu, Muthusamy Athianna, Anand Siddeswaran
Summary: A series of azomethine diol monomers containing naphthalene moiety were oxidatively polymerized in aqueous alkaline medium using NaOCl as oxidant. The polymers exhibit high thermal stability and good spectroscopic properties.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Polymer Science
Asif Raza, Amara Nasir, Mehwish Tahir, Shaista Taimur, Tariq Yasin, Muhammad Nadeem
Summary: Polyaniline grafted conducting nanohybrids were successfully synthesized by emulsion graft polymerization, with sepiolite as an ideal substrate showing excellent thermal stability and electrical conductivity. These nanohybrids exhibited outstanding EMI shielding effectiveness in the X-band frequency range.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Chemistry, Applied
Adrian Perez, Emily Kynaston, Christopher Lindsay, Nicholas Ballard
Summary: This study investigates the influence of alkali soluble resins (ASRs) on the mechanical properties of latex films. It is found that the composition of the copolymer phase has little effect on the Young's modulus, while the high Tg ASR phase plays a key role. Increasing the Tg of the copolymer phase leads to higher elongation break and tougher materials. Polar additives in coatings formulations selectively plasticize the polar ASR phase, resulting in a significant decrease in mechanical performance.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Polymer Science
Tomaz Kotnik, Gregor Zerjav, Albin Pintar, Ema Zagar, Sebastijan Kovacic
Summary: A new synthetic route to transition-metal free pi-conjugated polyHIPEs was reported, combining Schiff-base condensation reaction and emulsion-templating technology. The resulting highly porous azine- or imine-linked poly(arylene) networks exhibit high chemical resistance, thermal stability, and visible-light harvesting ability. Their photocatalytic properties were investigated in the degradation of aniline dissolved in water.
Article
Chemistry, Inorganic & Nuclear
Ramanath Prabhu, Karthika Shetty, T. Jeevananda, H. C. Ananda Murthy, Mika Sillanpaa, Tan Nhat
Summary: Polyaniline-halloysite nanoclay composites (PHC) were successfully prepared through inverted emulsion polymerization technique using benzoyl peroxide (BP) as the oxidizing agent. The FTIR spectra showed vibration bands associated with the stretching of NH, benzenoid, and quinoid rings. The specific conductance of the composites decreased with increasing halloysite nanoclay concentration, while the XRD pattern exhibited peaks at 20.08(0) and 25.34(0). Thermogravimetric analysis indicated improved thermal resistance compared to pure polyaniline. Field emission scanning electron microscopy revealed agglomeration of polyaniline particles and coating on halloysite nanoclay. The AC specific conductance increased due to the formation of bipolar and polarons, while the dielectric constant decreased with increasing frequency. The highest dielectric constant was observed for PHC (70/30) at 10(2) Hz, with a value of 14.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Polymer Science
Julio E. Trevino, Swati Mohan, Alexandra E. Salinas, Emilia Cueva, Karen Lozano
Summary: This study developed and characterized PVDF-conjugated polymer nanofiber-based systems, with PVDF/PPY nanofiber system exhibiting the highest piezoelectric performance. These systems show potential as an attractive source of energy for various devices.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Alexander Schmitt, Negar Kazerouni, Barry C. Thompson
Summary: Recent reports have shown that altering structural variables of non-conjugated pendant electroactive polymers (NCPEPs), such as stereoregularity, nature of the pendant group, and length of the spacer, is significant for tuning their optoelectronic properties. The post-polymerization functionalization method allows for selectively studying the effects of tuning these variables, but its scope for tuning the pendant group itself remains largely unexplored. This work investigates the compatibility of the photochemical thiol-ene post-polymerization method with various pendant groups and discusses the limitations and effects on the optoelectronic properties of the functionalized NCPEPs.
Article
Chemistry, Physical
Leila Mouacher, Ahmed Yahiaoui, Aicha Hachemaoui, Abdelkader Dehbi, Ali Mustapha Benkouider
Summary: This study investigated the chemical oxidative polymerization of aniline and 2-aminothiazole in the presence of an organoclay. Nanocomposites were synthesized with the addition of a stoichiometric amount of ammonium, and the effect of reaction time and molar ratio on polymer yield was examined. Characterization techniques confirmed successful polymerizations and the incorporation of polymers/copolymers into the clay, resulting in nanocomposites with good electrical response and improved thermal stability.
COLLOID AND POLYMER SCIENCE
(2021)
Review
Polymer Science
Ki-Young Yoon, Guangbin Dong
Summary: Multicomponent polymerization is an efficient method for synthesizing complex pi-conjugated polymers from simple building blocks. This feature article outlines several strategies for multicomponent polymerization and discusses the challenges and outlooks in the field.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Review
Polymer Science
Buket Bezgin Carbas
Summary: This review provides a brief description of electrochromic conductive polymers containing fluorene, focusing on their chemical, electrochemical, and optical properties. Understanding the effects of the position of functional groups on the conjugated polymer chain is crucial for researchers in this field.
Article
Multidisciplinary Sciences
Shiyan Chen, Lixia Peng, Yanan Liu, Xiang Gao, Ying Zhang, Chun Tang, Zhenghao Zhai, Liulin Yang, Weitai Wu, Xumin He, Liu Leo Liu, Feng He, Haiping Xia
Summary: This study reports the synthesis of conjugated polymers based on metalla-aromatic building blocks, which exhibit broad and strong absorption bands and good solubility. The polymerization mechanism was revealed through kinetic studies using NMR experiments and UV-Vis spectroscopy.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Multidisciplinary
Yuhan Jiang, Masato Kibune, Masatoshi Tosaka, Shigeru Yamago
Summary: The practical synthesis of structurally controlled hyperbranched polymers (HBPs) by organotellurium-mediated radical polymerization (TERP) in water under emulsion conditions is reported. The method allows for the controlled synthesis of HBPs with diverse branch structures and tunable polymer properties by changing the monomers used.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Evelyn Y. Calvillo-Munoz, Araceli Vega-Paz, Diego Guzman-Lucero, Irina Lijanova, Octavio Olivares-Xometl, Natalya Likhanova
Summary: The synthesis of water-soluble terpolymers by free-radical inverse microemulsion and solution polymerization techniques was investigated. The results showed that the solution method yielded terpolymers with higher molecular weights at lower temperatures, while the inverse microemulsion method incorporated more (vinylbenzyl)trimethylammonium chloride into the terpolymer structure.
Article
Engineering, Electrical & Electronic
Praveen Kumar Sharma, Navneet Gupta, Plamen I. Dankov
Summary: In this paper, a complete analysis of the complex dielectric constant of a flexible substrate from the silicon-based polymer- Polydimethylsiloxane (PDMS) is performed through two experimental methods, revealing uniaxial anisotropy and frequency dependencies. The temperature dependencies of the measured PDMS parameters are relatively strong, especially in the temperature range -30/+40 degrees C.
IEEE SENSORS JOURNAL
(2021)
Article
Polymer Science
Jin Qu, Xinru Ma, Guohao Miao, Yu Yang, Junping Zheng, Xiaofei Liu
Summary: This study investigates the structure and oil displacement performance of the oil-based supramolecular system based on polyacrylamide, and further discusses its oil displacement mechanism. The results show that the viscosity of the system increases significantly, improving the mobility ratio and swept volume. The ability of the system to remove crude oil from surfaces is enhanced, and the mathematical relationships are discussed. The oil displacement efficiency of the system in different dispersion media is explored using nonhomogeneous multistage bifurcation microchannels, supporting its practical application in oil fields.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Ceramics
Sukhbir Singh, Pardeep Khichi, Sajjan Dahiya, Rajesh Punia, A. S. Maan, Rahul Tripathi, Anil Ohlan
Summary: The present work systematically explores the impact of La substitution on the solubility range of Lanthanum in the Sr3Co2Fe24O41 structure. La substituted hexaferrites Sr3-xLaxCo2Fe24O41 were prepared and characterized using XRD, TEM, and SEM. The results indicate a limit of La solubility in Sr3-xLaxCo2Fe24O41 at x = 0.45. The dielectric properties of the samples exhibit frequency-dependent and thermally stimulated behavior. With increasing La substitution, the saturation magnetization decreases and coercivity increases, indicating an increase in magnetic hardness. Weak magneto-electric coupling is observed in the SCFO sample.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Miquel Angel Coll-Ramis, Patricia Horrach-Rossello, Juanabel Genovart-Balaguer, Aitor Martinez-Garcia, Anil Ohlan, R. Punia, A. S. Maan
Summary: Pristine and zinc-doped nickel oxide isotype heterojunction devices were fabricated on p-type silicon substrates using the sol-gel spin coating deposition technique. Structural, composition, defect state, and phase analyses were performed using X-ray diffraction and Raman spectroscopy techniques. The non-linear current-voltage characteristics of the devices showed diodic behavior. Incorporating Zn2+ in NiO significantly improved the UV photodetection behavior, with the largest photoresponse observed for 15% Zn2+ molar concentration.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Engineering, Electrical & Electronic
Sunil Agrohiya, Sajjan Dahiya, Ishpal Rawal, Parveen Kumar Goyal, Anil Ohlan, Rajesh Punia, A. S. Maan
Summary: Ultra-violet photodetectors based on ZnMn2O4 spinel were fabricated on silicon substrates using the sol-gel spin coating technique. The addition of 5% Zn to Mn2O3 resulted in the formation of a composite with two mixed phases, Mn2O3 and ZnMn2O4, which ultimately transformed into a pure ZnMn2O4 spinel phase at higher Zn concentrations. The fabricated devices exhibited significantly large photoresponses when illuminated with UV light, with increasing Zn concentration leading to improved device parameters and ultralow response and recovery times.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Energy & Fuels
Rimjhim Yadav, Ayushi Saini, Jyoti Choudhary, Silki Sardana, Anil Ohlan, Kuldeep Singh, Surinder P. Singh
Summary: In this study, binary nanocomposites of PPy with MoS2 in two different morphologies were prepared. The PPyNTs/MoS2 nanocomposite exhibited higher specific capacitance and better cycling stability compared to PPyC/MoS2, making it a suitable electrode material for flexible supercapacitors.
Article
Materials Science, Multidisciplinary
Preeti Redhu, Preeti Sharma, Ashima Hooda, Anupinder Singh, Anil Ohlan, Rajesh Punia
Summary: The effect of Cr doping on the dielectric, ferroelectric, and magnetic properties of Ba0.80Ca0.20TiO3 (BCT) ceramics has been studied, and structural changes have been correlated. The Cr-doped BCT ceramics showed a single-phase tetragonal perovskite structure. Tolerance factor, lattice parameters, unit cell volume, c/a ratio, and grain size decreased with increasing Cr dopant concentration. Dielectric measurements exhibited a dielectric anomaly at around 447 K caused by acceptor-induced defect dipoles. The temperature-dependent dielectric measurements showed a diffused phase transition, and the width of the transition increased with Cr doping. A weak ferromagnetic behavior was observed at room temperature under low magnetic fields.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Materials Science, Ceramics
Sukhbir Singh, Pardeep Khichi, Sajjan Dahiya, Rajesh Punia, P. K. Saini, Srinibas Satapathy, Rahul Tripathi, Anil Ohlan
Summary: This research aims to create composite films that combine the ferrimagnetic capabilities of Sr3Co2Fe24O41 Z-hexaferrites and the multifunctional features of ferroelectric polymers. Flexible magnetoelectric (ME) polymer composite films were synthesized using solution casting method. The inclusion of ferroelectric poly vinylidene fluoridehexafluoropropylene (PH) enhanced the magnetoelectric coupling of the composite films. The maximum value of magnetoelectric coupling coefficient (αME) observed was significantly increased in the composite films compared to pure SF.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Suman Pawaria, Jyoti Ahlawat, Preeti Sharma, Sajjan Dahiya, Anil Ohlan, R. Punia, A. S. Maan
Summary: The glass transition and crystallization kinetics of lithium-modified zinc borate glasses with different compositions were studied using differential scanning calorimetry. The glass composition of 20ZnO·10Li2O·70B2O3 showed the highest thermal stability and glass-forming tendency among all other compositions. The activation energies for crystallization and glass transition were determined and found to be in close agreement with each other. The formation of a pure monoclinic LiZnBO3 crystalline phase was observed in certain compositions, which has potential for electric double-layer capacitance fabrication.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Suman Pawaria, Jyoti Ahlawat, Sajjan Dahiya, Anil Ohlan, R. Punia, S. Murugavel, A. S. Maan
Summary: This study investigated the conductivity spectra of (80-x)B2O3.20ZnO.xLi(2)O (x = 10, 20, 30, and 40) glass series and found that the Overlapping Large Polaron Tunneling mechanism is applicable in these glasses. The activation energy values obtained from different analyses were in good agreement. The glass composition with the highest conductivity was identified for potential use in energy storage devices.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Sukhbir Singh, Sajjan Dahiya, Rajesh Punia, A. S. Maan, P. K. Saini, Srinibas Satapathy, Rahul Tripathi, Anil Ohlan
Summary: The Neodymium (Nd) substituted Sr-based Z-Hexaferrites were prepared and their properties were investigated. The structure and morphology of the samples were examined using X-ray diffraction and Scanning Electron Microscopy. The results showed the formation of Z-hexaferrite with adequate phase purity. The samples exhibited a relaxation-type, frequency-dependent, and thermally activated dielectric response. The coercivity values indicated a soft magnetic behavior in Nd substituted samples, and the magnetoelectric coupling coefficient varied with Nd substitution.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Silki Sardana, Sajjan Dahiya, Rajesh Punia, A. S. Maan, Kuldeep Singh, Anil Ohlan
Summary: This article presents a simple method to prepare an electrode for supercapacitors and demonstrates its high specific capacitance and cycling stability. The electrode exhibits excellent electrochemical performance and morphological characteristics, making it a potential solution for energy storage.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Sanket Malik, Silki Sardana, Sajjan Dahiya, Rajesh Punia, A. S. Maan, Anil Ohlan
Summary: The rapid development in the technology and communication field has sparked researchers' interest in materials that can reduce electromagnetic pollution. In this study, mesoporous La0.5Sr0.5Fe0.5Mn0.5O3 (LSFMO) was synthesized and mixed with graphene oxide to prepare composites. The resulting composite material showed high electrical conductivity and shielding effectiveness.
APPLIED SURFACE SCIENCE ADVANCES
(2023)
Article
Chemistry, Multidisciplinary
Anjli Sharma, Ashima Makhija, Deepika Yadav, Sajjan Dahiya, Anil Ohlan, R. Punia, A. S. Maan
Summary: This work reports on the electronic transport properties of SrxSn1-xS2 (x = 0, 0.02, 0.04, 0.06 and 0.08) nanoplates synthesized using the hydrothermal method. The AC conductivity, electric modulus, and impedance spectra of the nanoplates were studied in a frequency and temperature range. The results reveal different conduction mechanisms for different values of x, and a modified model was used to explain the electric modulus behavior. The activation energy values estimated from conductivity and electric modulus analysis were found to be consistent.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)
Article
Chemistry, Physical
Sunil Agrohiya, Ravinder Singh, Sajjan Dahiya, Ishpal Rawal, Amit Kumar, Anil Ohlan, R. Punia, A. S. Maan
Summary: Pure and zinc-doped cobalt oxide heterojunction devices have been fabricated on n-type silicon substrates using sol-gel spin coating deposition. The introduction of Zn2+ into Co3O4 results in a substantial increase in the photoresponse, detectivity, EQE values, and linear dynamic range (LDR) of the devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Energy & Fuels
Pardeep Khichi, Rahul Tripathi, Anil Ohlan
Summary: Transition metal dichalcogenides (MoSe2) have potential applications in hydrogen evolution reactions and other electronic and optoelectronic applications. However, synthesizing layered MoSe2 through the hydrothermal route is challenging. The study found that selenium does not easily dissolve in water and ethanol, but partially dissolves in a solution containing sodium borohydride and hydrazine monohydrate, leading to unreacted selenium in the product. An alternative method was adopted to remove the excess unreacted selenium and optimize the reaction parameters.
Article
Energy & Fuels
Silki Sardana, Kanika Aggarwal, Priya Siwach, Latisha Gaba, A. S. Maan, Kuldeep Singh, Anil Ohlan
Summary: With the rapid development of portable, lightweight, and flexible electronics, the demand for advanced energy storage systems that are flexible, cost-effective, and have higher power/energy densities has increased. In this study, a binder-free and flexible supercapacitor electrode based on hierarchical three dimensional conducting polymer hydrogels was developed using a two-step approach. The composite hydrogel electrode showed excellent electrochemical performance, cyclic stability, and energy density, making it a viable choice for high-performance and cost-effective energy storage devices.
