Article
Engineering, Electrical & Electronic
Farah Deeba, Ankit K. Gupta, Vaibhav Kulshrestha, Minal Bafna, Ankur Jain
Summary: The effect of different concentrations of zinc oxide on the dielectric properties of composite films was studied. It was found that increasing the zinc oxide content significantly increased the dielectric constant, AC conductivity, and loss tangent. A direct correlation between the dielectric parameter and the mean relaxation time of polymer chain segmental dynamics was observed, suggesting that the dielectric properties of these materials can be tailored by varying the amount of metal oxide filler for use in microelectronics.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Polymer Science
M. I. Mohammed
Summary: In this study, the effects of ZnO nanoparticles on PMMA/PVDF blend were investigated by using solution-cast technique to prepare nanocomposites. FTIR and SEM studies were conducted to analyze the properties. The results showed that the nanocomposites exhibited high dielectric constant and low dielectric loss, making them suitable for capacitors and memory device applications.
Article
Polymer Science
Zhuo Wang, Jinteng Kang, Dan Wu, Ying Xue, Zhihui Yi
Summary: The residual polarization of antiferroelectric ceramics is very small, but they possess high energy storage density and efficiency. Incorporating antiferroelectric ceramic particles into a polymer matrix is beneficial for improving the energy storage performance of composites. This study focused on using AgNbO3 as a filler modified with silane coupling agent KH550, and adjusting the amount of PVDF as the matrix to improve the energy storage performance of the composite.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Sumara Khursheed, Vinay Kumar, Vivek K. Singh, H. C. Swart, Jitendra Sharma
Summary: In this study, Sr3B2O6:Tb3+/PMMA luminescent polymer nanocomposite films were synthesized by combustion synthesis of Sr3B2O6:Tb3+ nanophosphors and dispersion in a PMMA matrix. Experimental investigations confirmed the viability of these LPNC films for solid state lighting applications, showing unique photoluminescence properties and thermal performance.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Materials Science, Composites
Juan Yi, Yiheng Song, Zhilong Cao, Chenjian Li, Chuanxi Xiong
Summary: With the demand for green energy increasing, piezoelectric nanogenerators (PENGs) are being developed for the next generation of wearable energy supply. This study focused on the preparation of Y-doped ZnO and PVDF, and the application of electrospun films in PENGs. Results showed that increasing the amount of Y-ZnO and enhancing the alignment of PVDF can improve the piezoelectric output, with the 15 Y-Z PENG showing promising performance under different loads.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Polymer Science
Ismail Borazan, Ayse Celik Bedeloglu
Summary: This paper investigates the development of self-standing piezoelectric nanogenerator (PENG) fabrics using flexible composite poly(vinylidene fluoride) (PVDF) nanofiber yarns doped with zinc oxide (ZnO) nanoparticles to enhance energy output. The most successful fabric achieved a peak total power of 81 µW and a power density of 30 µW/cm(2). These findings open up opportunities for the development and use of PVDF/ZnO-based nanomats in healthcare and engineering industries for sensors and actuators.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Optics
Ali K. Khaleel, Lamia K. Abbas
Summary: This study aimed to manufacture PVDF/PMMA thin films containing ZnO nanoparticles in different weight ratios by spin coating and use them as high-performance humidity sensors. The films were characterized for their structure, functional groups, transmittance, and optical energy band gap. The results showed that the films had polycrystalline hexagonal structures, with decreasing grain size as the weight ratio of ZnO nanoparticles increased. The films also exhibited a homogeneous distribution of nanoparticles and high sensitivity to humidity. The sensors manufactured using the films had acceptable values for parameters such as response time and retrieval time.
Article
Polymer Science
Ye Zhou, Wenting Liu, Bin Tan, Cheng Zhu, Yaru Ni, Liang Fang, Chunhua Lu, Zhongzi Xu
Summary: PVDF/PMMA blend films were prepared by biaxial stretching, and the effects of PMMA content and stretching ratio on the crystallinity and beta phase fraction of PVDF in blend films were investigated. Results showed that increasing PMMA content and stretching ratio improved the beta phase fraction and crystallinity of PVDF, with a continuous increasing trend observed even after preheating.
Article
Chemistry, Physical
K. Chandramouli, B. Suryanarayana, T. Anil Babu, Vemuri Raghavendra, D. Parajuli, N. Murali, Venkaiah Malapati, Tulu Wegayehu Mammo, P. S. Shanmukhi, Umesh Reddy Gudla
Summary: The structure, particle size, and antibiotic nature of synthesized ZnO nanoparticles were studied using XRD, TEM, and FTIR, revealing spherical particles with a single wurtzite hexagonal crystal structure. The correlation between defect and antibiotic properties of ZnO was identified.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Physical
Shalendra Kumar, Faheem Ahmed, Naushad Ahmad, Nagih M. Shaalan, Rajesh Kumar, Adil Alshoaibi, Nishat Arshi, Saurabh Dalela, Fatima Sayeed, Kavita Kumari
Summary: In this study, Cu-doped ZnO nanostructures were prepared using a microwave-assisted chemical route synthesis. The synthesized nanostructures were characterized structurally, morphologically, optically, and magnetically. The results showed that the samples had a single-phase polycrystalline hexagonal crystal structure, with a decrease in lattice parameters by increasing Cu% doping. The samples exhibited photoemission in the UV and blue-green regions, with changes in these regions caused by Cu doping, and Cu ions successfully incorporated into the ZnO lattice. All of the samples exhibited ferromagnetic behavior, with enhanced ferromagnetic character with increasing Cu%.
Article
Materials Science, Paper & Wood
Roberta Motta Neves, Heitor Luiz Ornaghi, Benoit Duchemin, Ademir Jose Zattera, Sandro Campos Amico
Summary: This study investigates the grafting amount and structural characteristics of microcrystalline cellulose (MCC) functionalized with 3-aminopropyltriethoxysilane (APTES) (MCC-Si) at different contents. Three different methods for quantifying the APTES grafting amount were compared, and supplementary analyses were performed. The nitrogen content method showed better correlation with the grafting amount. The structural properties of MCC-Si samples were explored using nuclear magnetic resonance, Fourier-transform infrared spectroscopy, and scanning electron microscopy.
Article
Engineering, Electrical & Electronic
A. Sedky, N. Afify, Abdullah Almohammedi, E. M. M. Ibrahim, Atif Mossad Ali
Summary: We investigated the structural, optical, photoluminescence (PL), and magnetic properties of Zn1-x-yFexMyO nanoparticles. The lattice constants and crystallite size decreased with increasing Fe content, and further decreased up to (Fe + M) = 0.30. Fe doping led to a compressive stress and the particle size ranged from 180 to 277 nm in the order of ZnO, (Fe + Cu), (Fe + Ni), and Fe samples. While pure and Fe-doped ZnO had a single energy gap (E-g), co-doped samples exhibited two energy gaps (E-gh and E-gl). Fe generally increased E-g, followed by a further increase in the Cu-series and a decrease in the Ni-series. Refractive indices n(K) and n(T) decreased with Fe, with a further decrease in both series. Although Fe doping reduced the carrier density (N/m*), it increased again in the co-doped samples. Fe decreased the residual dielectric constant epsilon(L), followed by an increase in the Cu-series but a decrease in the Ni-series. The loss factor tan delta slightly increased with Fe, followed by an increase in the Ni-series and a decrease in the Cu-series. Fe significantly depressed the optical conductivity sigma(opt), followed by a further decrease, particularly in the Cu-series. PL measurements showed four visible emissions, and an infrared emission at around 825 nm was only observed in the co-doped samples. The blue emission (I-blue) was higher than the ultraviolet emission (I-UV), [(I-blue/I-UV) > 1], and the Ni series had a greater blue emission than the Cu series. ZnO exhibited diamagnetic behavior, while Fe and co-doped samples exhibited ferromagnetic behavior, with higher magnetization in the Ni-series than the Cu. Overall, the results suggest that co-doped samples at the nanoscale have potential applications in advanced devices.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Nuengruethai Ekthammathat, Anukorn Phuruangrat, Thirawit Phonkhokkong, Wachiraporn Maisang, Patcharanan Junploy, Arrak Klinbumrung, Somchai Thongtem, Titipun Thongtem
Summary: Mn-doped ZnO samples were successfully synthesized using sonochemical method, with XRD showing peak shifts due to Mn2+ incorporation. SEM and TEM observations revealed morphological changes in Zn1-xMnxO at different doping concentrations. The highest saturation magnetization was observed in 3 mol% Mn-doped ZnO, while 5 mol% Mn-doped ZnO exhibited suppressed ferromagnetic properties due to Mn cluster formation.
Article
Polymer Science
Pen Yiao Ang, Marko Cehovski, Frederike Lompa, Christian Haenisch, Dinara Samigullina, Sebastian Reineke, Wolfgang Kowalsky, Hans-Hermann Johannes
Summary: Organic thin-film lasers are considered potential light sources with advantages such as low cost, high performance, and color tunability. This study tested the feasibility of using organic dye-doped PMMA as an organic dye laser and found the best sample design model.
Article
Materials Science, Composites
Zhen Wang, Wenqing Xue, Yongzhi Yang, Yuchao Li, Shuangshuang Wang, Yanhu Zhan, Wei Li, Jigong Hao, Jun-Wei Zha, Chen Liu, Yulin Cao, Zhouguang Lu
Summary: In this study, PMMA brush-modified graphene (rGO-g-PMMA) was successfully incorporated into PVDF matrix, resulting in increased dielectric constant and breakdown strength. The addition of rGO-g-PMMA also suppressed dielectric loss and improved thermal stability and mechanical strength of the obtained films. This research provides a new strategy for obtaining flexible, high strength, and large energy storage dielectric films.
COMPOSITES COMMUNICATIONS
(2023)
Review
Chemistry, Medicinal
Hari Madhav, Nasimul Hoda
Summary: Malaria is an endemic disease prevalent in tropical and subtropical regions, with current therapeutic efforts being insufficient due to drug resistance, lack of vaccine availability, and absence of new mechanism drugs. Recent intensification of antimalarial research has led to the development of single dose multistage therapeutic agents to overcome drug resistance. The review explores progress in developing new promising antimalarials against target proteins with potential for clinical use, along with highlighting drug resistance aspects and new drug candidates.
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
(2021)
Article
Polymer Science
Neetika Singh, Elham S. Aazam, Ufana Riaz
Summary: The study reported the chemical oxidative polymerization of benzoquinone with triphenylamine using ultrasound-assisted technique, characterizing the polymer obtained through various analyses. The experimental data were in good agreement with the theoretically computed results, showcasing the potential of the synthesized polymer as a near infrared bioimaging agent.
Review
Polymer Science
Vijay Prakash Jain, Shivani Chaudhary, Deepa Sharma, Neeru Dabas, Ram Sunil Kumar Lalji, Brajendra Kumar Singh, Gautam Jaiswar
Summary: This study reviews recent important advances in the functionalization of graphene, emphasizing the physical properties upon tailored modification. Functionalization has been shown to stabilize graphene's unique properties and introduce new properties. Different methods like covalent and non-covalent functionalization, as well as decoration with nanoparticles, can be used for graphene functionalization.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Neetika Singh, Rahat Ali, S. M. Ashraf, Abdur Rub, Ufana Riaz
Summary: Introduction of multi-functionality in conducting polymers through modification with dyes is a simple technique to design photosensitive and fluorescent polymers. This study successfully modified conventional conducting polymers with Sudan-I dye using a microwave-assisted method, resulting in oligomers with unique properties such as singlet oxygen generation and cytotoxicity against Leishmania parasite. The oligomers demonstrated potential for the development of new, effective and less toxic techniques for treating leishmaniasis.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2021)
Review
Polymer Science
Neetika Singh, Ufana Riaz
Summary: Conducting polymers have been extensively studied due to their unique electrical, optical, and mechanical properties, as well as their ease of synthesis and high environmental stability. This review discusses the fundamental properties of conducting polymers, various methods of polymerization, and the synergistic effects observed in these polymers. Current applications in energy, medical diagnostics, and sensing devices are also discussed.
Article
Engineering, Chemical
Paramjit Singh, Hari Madhav, Neetika Singh, Gautam Jaiswar, Nahid Nishat
Summary: Functional polymers have a wide range of applications, and this study contributes to the understanding of functionalization in designing easy and cost-effective materials with desired properties. The research also provides insights into the impact of different amino functional groups on the optical properties of PMMA, with PHNG3 showing strong UV absorption.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Chemistry, Physical
Mohit Kumar, Meenakshi Singh, Gautam Jaiswar, Ram Sunil Kumar Lalji, Brajendra K. Singh, Arun Sharma, Ghazala Khanum, Aysha Fatima, Anuj Kumar, Jaipal, Nazia Siddiqui, Saleem Javed
Summary: The quantum chemical properties and experimental spectroscopy of 2-aminobenzothiazole (2-ABT) were investigated, providing insights into its molecular structure, properties, and interactions.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Review
Environmental Sciences
G. Jaiswar, N. Dabas, S. Chaudhary, V. P. Jain
Summary: This review article focuses on different types of absorbers for capturing CO2 emissions from stationary point sources. It discusses the absorption of CO2 by nanofluids, nanocrystals, and two types of membranes - hollow fibre membrane and omniphobic membrane. The potential applications of omniphobic membrane as CO2 absorbers are also highlighted. The use of nanofluids with SiO2 and Al2O3 nanoparticles for CO2 absorption and CO2 absorption by nanocrystals such as amin-based cellulose nanocrystals and amino silane-grafted cellulose nanocrystals are discussed. The article is divided into four sections covering introduction, membrane types and designs, nanocrystals applications, and nanofluids properties. Future research should focus on modifying membranes and nanomaterials to improve the absorption of CO2 gas.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Medicinal
Hari Madhav, Somaya A. Abdel-Rahman, Md Amiruddin Hashmi, Md Ataur Rahman, Mohammad Rehan, Kavita Pal, Shahid M. Nayeem, Moustafa T. Gabr, Nasimul Hoda
Summary: The study developed pyrazine-based multi-target directed ligands (MTDLs) through multicomponent Petasis reaction for the simultaneous inhibition of tau-aggregation and human acetylcholinesterase (hAChE) in Alzheimer's disease. The synthesized ligands were structurally validated, and showed strong inhibitory effects against tau-oligomerization and hAChE, with moderate activity against A beta 42. Compound 21 exhibited potential neuroprotective effects and displayed higher binding energy with AChE compared to compound 24. This study provides insights into the design of new MTDLs and identifies compound 21 as a potential obstacle in the development of anti-AD medications.
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
(2023)
Review
Polymer Science
Deepa Sharma, Mohit Kumar, Vijay Prakash Jain, Shivani Chaudhary, Gautam Jaiswar
Summary: This study focuses on bio-based polyamides (PAs) and their nanocomposites with nanoclay, carbon nanotubes (CNT), and graphene. These materials are widely used in industries such as automobile, flame retardant, packaging, and textile due to their excellent thermal properties and processability. The research on polyamide-based nanocomposites has been conducted for many years and has shown significant enhancements in material properties. The synthesis of polyamides and nanocomposites was achieved through solution, melt-blending, and in situ polymerization methods. The study discusses various properties of polyamides and how these properties can be improved through nanocomposites. The applications of these polymer nanocomposites in flame retardancy, packaging, textile, and automotive parts are also discussed, with a focus on their eco-friendly sustainability.
IRANIAN POLYMER JOURNAL
(2023)
Article
Chemistry, Medicinal
Hari Madhav, Tarosh S. Patel, Zeba Rizvi, G. Srinivas Reddy, Abdur Rahman, Md. Ataur Rahman, Saiema Ahmedi, Sadaf Fatima, Kanika Saxena, Nikhat Manzoor, Souvik Bhattacharjee, Bharat C. Dixit, Puran Singh Sijwali, Nasimul Hoda
Summary: Malaria is a widespread infectious disease that caused nearly 247 million cases in 2021. The lack of an effective vaccine and declining effectiveness of current antimalarials pose major challenges to eradicating malaria. In this study, a series of 4,7-dichloroquinoline and methyltriazolopyrimidine analogues were synthesized to develop novel antimalarials. These synthesized molecules were found to have potent in-vitro antimalarial activity and inhibit cysteine proteases. They also demonstrated the ability to arrest the growth of parasites without significant cytotoxicity. Overall, these findings suggest the potential of these molecules as new antimalarial agents.
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Sadaf Fatima, Almaz Zaki, Hari Madhav, Bibi Shaguftah Khatoon, Abdur Rahman, Mohd Wasif Manhas, Nasimul Hoda, Syed Mansoor Ali
Summary: In this study, several 2-methoxy-6-((4-(6-morpholinopyrimidin-4-yl)piperazin-1-yl)(phenyl)methyl)phenol derivatives were synthesized and their anti-inflammatory activity in LPS-stimulated macrophage cells was evaluated. Among these derivatives, 2-methoxy-6-((4-methoxyphenyl)(4-(6-morpholinopyrimidin-4-yl)piperazin-1-yl)methyl)phenol (V4) and 2-((4-fluorophenyl)(4-(6-morpholinopyrimidin-4-yl)piperazin-1-yl)methyl)-6-methoxyphenol (V8) showed significant inhibition of NO production at non-cytotoxic concentrations. These compounds also reduced iNOS and COX-2 gene and protein expression, indicating their potential as a novel therapeutic strategy for inflammation-associated disorders.
Review
Biochemistry & Molecular Biology
Hari Madhav, Ehtesham Jameel, Mohammad Rehan, Nasimul Hoda
Summary: This review highlights the recent advancements and developments of chromones as potential therapeutic molecules for neurodegenerative diseases. Different chromone derivatives have been studied as multi-target-directed ligands with potential inhibition against proteins and pathological processes associated with neurodegenerative diseases.
RSC MEDICINAL CHEMISTRY
(2022)
