jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: S. P. Gawali | P.B. Abhange | Ram S. Barkule | A.V. Raut | D.V. Mane
Source: Asian Journal of Chemistry (article, 2026-03-06)
Field: Materials Science — Materials Chemistry

Synthesis of Pure and Ag-doped CuFe2O4 Nanoparticles using a Microwave-Assisted Biosynthesis Method and Investigation of their Antioxidant and Antimicrobial Activity This study reports the successful synthesis and characterisation of silver-doped copper ferrites nanoparticles (Agx​Cu1-xFe2​O4, where x = 0.05, 0.1, 0.2) through microwave-assisted biosynthesis employing Asteracantha longifolia leaf extract as a reducing and stabilizing agent. X-ray diffraction analysis (XRD) confirmed the formation of single-phase cubic spinel structures with systematic lattice parameter variations from 8.294 to 8.165 Å upon silver incorporation. Electron microscopy (SEM) revealed morphological evolution from spherical to irregular geometries with crystallite sizes ranging between 15.43-18.85 nm. The substitutional mechanism of Ag+ ions into tetrahedral and octahedral sites was evidenced by structural refinement, demonstrating successful dopant integration without phase segregation. Spectroscopic investigations revealed enhanced optical absorption in the UV-visible region (300-800 nm) due to surface plasmon resonance effects of silver nanodomains. Magnetic characterisation showed decreased saturation magnetisation values correlating with silver content, attributed to the diamagnetic nature of Ag+ ions disrupting magnetic exchange interactions. Thermal gravimetric analysis indicated structural stability up to 600 ºC with minimal mass loss. Antioxidant evaluation through DPPH radical scavenging demonstrated concentration-dependent activity enhancement, with Ag0.2Cu0.8Fe2O4 exhibiting 55.35% radical neutralisation efficiency compared to 41.87% for undoped copper ferrite. The improved performance stems from increased electron-donating capacity facilitated by the electronic properties of silver, establishing these nanocomposites as promising materials for advanced oxidative stress mitigation applications in biomedical and environmental sectors. Copper ; Surface plasmon resonance ; Nanoparticle ; Crystallite ; Thermogravimetric analysis ; Spinel ; Nanomaterials ; Dopant ; DPPH Magnetic Properties and Synthesis of Ferrites ; Nanoparticles: synthesis and applications ; Nanoparticle-Based Drug Delivery
Authors: Raquel Becerril | Estela Pérez-Bondía | Alejandro Delso | David Rupérez | Margarita Aznar | Filomena Silva
Source: Food and Bioprocess Technology (article, 2026-03-13)
Field: Materials Science — Biomaterials

Chemical Risk Assessment of an Antimicrobial Packaging with Cellulose Nanofibers from Industrial Recycled Pulp Abstract The current study aims to develop an antimicrobial bio-based packaging material using cellulose nanofibers (CNFs) isolated from recycled industrial paper pulp while evaluating its safety as food contact material for dry or fatty food packaging. CNFs were produced through TEMPO-mediated oxidation followed by ball milling defibrillation and physical–chemical characterization. CNF suspensions were used to prepare emulsions with oregano essential oil (OEO) for the coating of a cellulose food contact material. The resulting active film exhibited antimicrobial activity, with films coated with 4% OEO completely inhibiting the growth of foodborne bacteria and molds , except Pseudomonas putida . In terms of mechanical performance, CNF coatings increased the tensile strength of the cellulosic film from 34.8 to 79.3, while CNF-OEO coatings showed a tensile strength of 45.4 MPa. Additionally, CNF-OEO coatings also improved the elongation at break from 22.6 to 45.5%. Finally, migration studies of CNF-OEO-coated films indicated that the overall migration, as well as the migration values obtained for each migrant, were lower than their respective migration limits or toxicological threshold values. The results obtained have demonstrated that a sustainable and available as recycled paper pulp, can be used as a source of cellulose nanofibers for the development and improvement of antimicrobial active packaging. Graphical Abstract Cellulose ; Ultimate tensile strength ; Food packaging ; Nanofiber ; Antimicrobial ; Pulp (tooth) ; Coating ; Wet strength Advanced Cellulose Research Studies ; Nanocomposite Films for Food Packaging ; Natural Fiber Reinforced Composites
Authors: Wiwit Sepvianti | Suherman Suherman | Bambang Purwono
Source: ScienceRise Pharmaceutical Science (article, 2026-02-28)
Field: Materials Science — Materials Chemistry

Synthesis and antibacterial activity of nitrogen-doped carbon dots The aim of our work is to synthesize N-CD and to evaluate its antibacterial activity against Gram-positive and Gram-negative bacteria. Material and Methods. N-CDs were synthesized from citric acid and urea using a bottom-up approach using microwave-assisted treatment. The nitrogen doping in the CDs structure was studied on an FTIR (Shimadzu IR Prestige-21). The optical properties of N-CDs were detected using fluorescence spectroscopy (Shimadzu RF-6000) and UV-Vis absorption spectroscopy (Shimadzu 1800). The size of N-CDs nanoparticles was confirmed on a TEM (JEOL-JEM 1400). Elemental analysis was performed on an ELEMENTAR vario EL cube. The antibacterial activity of N-CDs was investigated using the agar disk diffusion and dilution method against S.aureus and E.coli bacteria. Results. The structure and characteristics of N-CDs were confirmed through several stages. The size of N-CDs based on TEM images ranged from 2.4 to 2.6 nm with a fairly uniform size distribution. The success of nitrogen doping was confirmed through fluorescence spectra, UV-vis absoption spectra, FTIR spectra and elemental analysis. The antibacterial activity tests showed that N-CDs were able to inhibit the growth of Gram-positive bacteria (S. aureus, clear zone=9.93±0.2 mm, MIC=50 µg/mL, IC50=272 µg/mL) and Gram-negative bacteria (E. coli, clear zone=8.29±0.3 mm, MIC=50 µg/mL, IC50=339 µg/mL) which makes it a broad-spectrum antibacterial candidate. Conclusions: N-CD was successfully synthesized and exhibited broad bacterial inhibitory activity. However, its inhibitory performance against Gram-positive bacteria was much better, as seen from the clear zone diameter and IC50 values Antibacterial activity ; Fourier transform infrared spectroscopy ; Fluorescence ; Bacteria ; Antibacterial agent ; Dilution ; Elemental analysis ; Absorption spectroscopy ; Absorption (acoustics) Carbon and Quantum Dots Applications ; Synthesis and bioactivity of alkaloids ; Curcumin's Biomedical Applications
Authors: Xinjian Li | Fan Wang | Haowen Yin | Yang Wang | Guangxi Li | Junjie Huang | Yanhe Yuan | Minghao Zhou | Shuai Zhao | Yingjie Liang | Guangyu Cao | Le Li
Source: Nanomaterials (article, 2026-01-27)
Field: Materials Science — Materials Chemistry

Study on Dielectric Properties of Nanoclay-Modified Disulfide-Containing Polyurea Composites To address the frequent faults (e.g., bird-related hazards, wind deviation) of transmission lines under extreme environments and the limitations of traditional insulating materials (insufficient dielectric properties, poor interface compatibility, etc.), this study synthesized a disulfide-containing polyurea (DPU) with dynamic covalent bonds and prepared Halloysite nanotubes (HNTs) modified by aminopropyltriethoxysilane (APTES) to form the HNTs/DPU composite. Methods included characterizations like Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and performance tests such as contact angle measurement, breakdown strength, arc resistance, dielectric constant tests, and a tower gap breakdown test. Results showed that APTES modification enhanced interface compatibility, leading to a uniform and dense microstructure. Compared with commercial polyurea (CPU) and commercial insulating sheath (CIS), HNTs/DPU exhibited superior performance: higher glass transition temperature (Tg) and thermal stability, excellent hydrophobicity, improved breakdown strength and dielectric constant, longer arc resistance time by blocking microcrack propagation, and optimal insulation effect at 4 mm coating thickness in the tower gap test with a significantly higher breakdown voltage. In conclusion, HNTs/DPU provides a new technical solution for transmission line insulation protection under extreme conditions, with comparative data demonstrating advancements over existing materials. Polyurea ; Dielectric ; Differential scanning calorimetry ; Dielectric strength ; Dielectric spectroscopy ; Coating ; Fourier transform infrared spectroscopy ; Scanning electron microscope High voltage insulation and dielectric phenomena ; Thermal Analysis in Power Transmission ; Lightning and Electromagnetic Phenomena
Authors: Sumesh Keerthiveettil Ramakrishnan | Kavimani Vijayananth | Tatana Vackova
Source: Polymer Composites (article, 2026-01-26)
Field: Materials Science — Polymers and Plastics

Flax Fiber Flyash/Steel Reinforced Sustainable Composites in Corrosive Conditions: Mechanical, Wear, and Corrosion Properties ABSTRACT A composite sample with 18% flax fiber flyash (FF) exhibits increased tensile strength (TS) and greater load‐transfer efficiency of the reinforcement under corrosive conditions. Similarly, increasing the biowaste filler (BW) content from 2 to 6 wt% improves bonding between the reinforcement and the polylactic acid (PLA) matrix, resulting in better tensile properties. A high applied load of 15 N in the composite samples led to better contact with EN 31 steel, resulting in a higher wear rate. The 18FF/6BW sample exhibited better wear resistance, similar to that of the 18FF/6BW/5 steel (ST) combination in the corrosive environment. A sliding distance in the range of 500–1500 m demonstrated improved wear resistance, with values between 6.1 and 6.4 × 10 −4 mm 3 /Nm, when utilizing a hybrid bio combination containing 5ST. The sliding speed at 1500 rpm resulted in greater interaction between the counter steel plate and the composite specimen, thereby increasing the wear rate. The hybrid combination with FF, ST, and BW has not been tried yet. The application of increased reinforcement at 18FF/6BW/15ST produced a coefficient of friction (CoF) reaching up to 0.43 in the hybrid sample. It can be observed that the 18FF/6BW and 18FF/6BW/5ST combinations have the lower corrosion rate (CR) (0.12 and 0.15 mpy) and better inhibition efficiency (IE) (34% and 30%) among all the combinations. The bio‐combination acted as a corrosion inhibitor, exhibiting improved corrosion properties. Ultimate tensile strength ; Composite number ; Corrosion ; Reinforcement ; Polylactic acid ; Fiber ; Friction coefficient Natural Fiber Reinforced Composites ; Tribology and Wear Analysis ; Aluminum Alloys Composites Properties
Authors: Joana B. Caldeira | Rita Branco | Paula V. Morais
Source: Frontiers in Microbiology (article, 2026-04-09)
Field: Chemistry — Inorganic Chemistry

Understanding the role of vanadium: insights into bacterial responses and adaptations Vanadium (V) is a critical and important metal used in various industries, but its accumulation in the environment poses a risk and can lead to pollution. The study of microorganisms for metal recycling in renewable biotechnologies has attracted significant research interest. However, there is limited information on the interaction between V and bacteria. The present paper aims to summarize advancements made in the last 5 years (2020–2025) by systematically reviewing articles that mention V. We analyzed a total of 347 articles, ultimately focusing on 45 relevant studies from three different databases. This work enhances our understanding of the bacterial mechanisms responding to V-exposure, as reported in the literature over the last 5 years. The published articles primarily focus on three areas: the exploration of V-containing proteins, the investigation of genes and proteins that are most active with V-exposure, or bioremediation processes. The articles demonstrate a clear that become most active upon V-exposure, and the study of bioremediation processes involving V. The articles illustrate a clear biological relationship between V resistance mechanisms and denitrification processes. Specifically, it has been shown that certain metabolic activities typically associated with nitrates and nitrites become more prevalent in the presence of V. Moreover, mechanisms that provide resistance to other metals, such as chromate and arsenate, are suggested to also contribute to cellular resistance to V. Similar to the effects of other metals, V-exposure appears to induce oxidative stress, with many stress protection mechanisms being enhanced during V-exposure. While some studies indicate that cells can perform V-bioreduction, quantifying this process and making comparisons is challenging due to limitations in experimental design. Extracellular V-immobilization has been observed through interactions with bacterial extracellular polymeric substances; however, the specific enzymatic activities involved remain unidentified. This review also identifies some knowledge gaps that will drive future research into bacterial interactions with V. The lack of identified dedicated V(V)-reductases, as well as unclear mechanisms of V transport and intracellular handling, requires further investigation. By consolidating this information, the review reveals bacterial mechanisms related to V and offers insights for the development of new biotechnologies. Bioremediation ; Mechanism (biology) ; Resistance (ecology) ; Process (computing) ; Organism Vanadium and Halogenation Chemistry ; Metalloenzymes and iron-sulfur proteins ; Metal Extraction and Bioleaching
Authors: Lindsay M. Harrison | Alisha Clark | Adam Sarafian | Lisa A. Moore | Craig D. Nie | Galan Moore | James Tingley | Matthew E. McKenzie
Source: The Journal of Physical Chemistry B (article, 2026-03-19)
Field: Materials Science — Ceramics and Composites

Chemical Species-Dependent Structural Modification of Vitreous SiO <sub>2</sub> by Monovalent Anions The effects of volatile species on vitreous SiO<sub>2</sub> (<i>v</i>-SiO<sub>2</sub>) influence transport and physical properties that have important implications for telecommunications and geological applications. While the effects of monovalent anions such as fluorine, chlorine, and hydroxyl on the transport and optical properties of <i>v</i>-SiO<sub>2</sub> are highly studied, their effects on elastic properties are less well-known. We measured density and performed resonance ultrasound spectroscopy, gigahertz ultrasonic interferometry, Raman spectroscopy, Fourier transform infrared spectroscopy, and molecular dynamics simulations to obtain the elastic moduli, elastic wave speeds, structural properties, and fictive temperatures of F-, Cl-, and OH-doped <i>v</i>-SiO<sub>2</sub>. We find that while density reductions as a function of mol % dopant are the same for both F and Cl, the elasticity and structural data show that the addition of Cl to <i>v</i>-SiO<sub>2</sub> has a buttressing effect on the network, leading to a stiffer material relative to the F-doped <i>v</i>-SiO<sub>2</sub> with the formation of percolation channels. Although all three monovalent anions are incorporated into <i>v</i>-SiO<sub>2</sub> by replacing an oxygen atom in SiO<sub>4</sub><sup>4-</sup> tetrahedra, the halogens and OH have markedly different effects on the medium-range order of <i>v</i>-SiO<sub>2</sub>. Poisson's ratio and structural data show that the incorporation of halogen anions leads to closer packing of tetrahedra and an increase in the populations of smaller tetrahedral rings (3- and 4-membered) at the expense of larger tetrahedral rings (≥5-membered). In contrast, there is little distinguishable change in larger ring size in hydroxyl-doped <i>v</i>-SiO<sub>2</sub> as the populations of smaller tetrahedral rings decrease, and Poisson's ratio indicates a more open, less densely packed structure. These results imply that OH-doped <i>v</i>-SiO<sub>2</sub> will be able to accommodate more stress before the onset of permanent densification than halogen-doped <i>v</i>-SiO<sub>2</sub>. The results of this study offer new insights into the relationship between the structure and properties of F-, Cl-, and OH-doped fused silica glasses, which are particularly applicable to the understanding of Rayleigh scattering. Tetrahedron ; Halogen ; Dopant ; Elasticity (physics) ; Raman spectroscopy ; Infrared ; Atom (system on chip) ; Molecular dynamics ; Fourier transform infrared spectroscopy Glass properties and applications ; Structural Analysis of Composite Materials ; Silicone and Siloxane Chemistry
Authors: Senthil Kumar Kuppusamy | Christian Pachl | Zhaoyang Jing | Sagar Paul | Benoît Heinrich | Olaf Fuhr | Svetlana Klyatskaya | Wolfgang Wernsdorfer | Annie K. Powell | Karin Fink | Mario Ruben
Source: Dalton Transactions (article, 2026-01-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Ligand-field symmetry and magneto-optical correlations in a luminescent Dy( <scp>iii</scp> ) single-molecule magnet The establishment of ligand field (LF) symmetry around lanthanoid (Ln(III)) centres is of paramount importance to understand factors that govern magnetization relaxation in single-molecule magnets (SMMs). We investigated a luminescent mononuclear Dy(III) compound [Dy(BA)<sub>4</sub>] (pip) (1), where pip is a piperidinium cation and BA is a benzoylacetonate ligand. The stoichiometric compound exhibits zero-field SMM characteristics; quantum tunnelling of magnetization (QTM) dominates magnetization relaxation. In the diluted version of the compound (1@Y), the QTM is mitigated, and Raman and Orbach processes are involved in the relaxation. The effective energy barrier (<i>U</i><sub>eff</sub> = 53.61 cm<sup>-1</sup>; <i>H</i><sub>DC</sub> = 0 Oe) estimated for magnetization relaxation is comparable with the LF splitting (Δ<i>E</i> = 57.2 cm<sup>-1</sup>) between the ground and first excited Kramers doublets (KDs) determined from the <sup>4</sup>F<sub>9/2</sub> → <sup>6</sup>H<sub>15/2</sub> Dy(III)-based transition recorded at 2.4 K. By analysing the emission spectrum of the isostructural Eu(III) analogue as a spectroscopic probe for site symmetry, the LF symmetry around the Dy(III) centre is assigned as <i>C</i><sub>2v</sub>. The close proximity (178 cm<sup>-1</sup>) of the triplet state of the ligand and the <sup>4</sup>F<sub>9/2</sub> state of the Dy(III) facilitates back energy transfer, thereby rendering 1 emissive only at cryogenic temperatures. The predictive accuracy of the complete active space spin-orbit configuration interaction (CASOCI) method is benchmarked against the experimental emission profile. Overall, we propose a strategy to assign effective LF symmetry around Dy(III), establish magneto-optical correlations, and provide a comprehensive analysis of the emission process of 1. Lanthanide ; Symmetry (geometry) ; Magnetization ; Magnetic relaxation ; Relaxation (psychology) ; Luminescence ; Field (mathematics) ; Magnet Magnetism in coordination complexes ; Lanthanide and Transition Metal Complexes ; Organic Light-Emitting Diodes Research
Authors: Qiuyun Guo | He Lv | Ran Dong | Wu Yi | Hongxi Wang | Hui Liu | Deng-Guang Yu | Tao Yi
Source: Polymers (article, 2026-03-25)
Field: Materials Science — Biomaterials

Fast Dissolving Resveratrol–Polyvinylpyrrolidone Nanofibrous Films Fabricated in Bulk Using a Special Hole Electrospinning Technique Batch production of nanomaterials is highly desired for developing commercial nanoproducts. Here, a brand-new electrospinning method, termed hole electrospinning, was developed for batch production of drug-loaded polymeric nanofibers. Using resveratrol and polyvinylpyrrolidone as model drug and filament-forming matrix, respectively, both hole and single-needle electrospinning were conducted. The resultant nanofibrous films were compared in terms of morphology, physical and thermal properties, mechanical performance, fast-dissolution rate, and antioxidant activity. Analytical and characterization results verified that nanofibers from different processes showed no significant differences in morphology, diameter, porosity, tensile strength, amorphous state, fast-dissolution performance and antioxidant activity. However, hole electrospinning provided 13.3-fold higher productivity than single-needle electrospinning, better drug encapsulation efficiency (97.3 ± 4.5% versus 83.7 ± 6.1%), and higher energy efficiency (0.0393 W/g versus 0.1247 W/g). Based on the protocols reported here, not only was a batch nano-conversion method for polymeric engineering developed, but also an attractive approach for the large-scale production of various complex configurations was proposed for potential commercial nanostructure-based products. Electrospinning ; Polyvinylpyrrolidone ; Nanofiber ; Nanomaterials ; Ultimate tensile strength ; Amorphous solid ; Dissolution Electrospun Nanofibers in Biomedical Applications ; Advanced Sensor and Energy Harvesting Materials ; Tissue Engineering and Regenerative Medicine
Authors: Xincong Du | Heguang Liu | Yiwei Shao | Na Tian | Caiyin You
Source: Nano Research (article, 2026-02-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Graphene composite aerogel for highly efficient and multifunctional EMI shielding via dielectric-magnetic synergy strategy The accelerated growth of modern electronics and devices has drawn considerable attention for the exploration and fabrication of innovative electromagnetic interference (EMI) shielding materials. Due to its layered porous architecture and distinctive characteristics, graphene aerogel is considered an appropriate candidate for advanced EMI shielding materials. Nonetheless, developing effective EMI shielding materials from graphene aerogel is challenging due to its moderate electrical conductivity. In this study, motivated by the concept of dielectric-magnetic synergy strategy, we present a graphene composite aerogel incorporating CoFe<sub>2</sub>O<sub>4</sub> nanoparticles (NPs) and Ag nanowires (NWs) as enhancements. The CoFe<sub>2</sub>O<sub>4</sub> NPs/Ag NWs/graphene composite aerogel, benefiting from the synergistic effects of CoFe<sub>2</sub>O<sub>4</sub> NPs, Ag NWs, and graphene aerogel, demonstrated exceptional EMI shielding capabilities. Specifically, the CoFe<sub>2</sub>O<sub>4</sub> NPs/Ag NWs/graphene composite aerogel (5 mm) offered an optimal shielding effectiveness of 67.4 dB, which was 247% of the graphite aerogel. Meanwhile, it exhibited a remarkable low density of 0.048 g/cm<sup>3</sup> and a high specific shielding effectiveness value of up to 1291.67 dBcm<sup>3</sup>/g. In addition, it also showed superior Joule heating performance and hydrophobicity. Aerogel ; Graphene ; Electromagnetic shielding ; EMI ; Composite number ; Graphite ; Electromagnetic interference Electromagnetic wave absorption materials ; Electromagnetic Fields and Biological Effects ; Smart Materials for Construction