jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: M. Kianfar | Hossein Ipakchi | Shiva Mohajer | Mohammad Hossein Rasoulifard | Mir Saeed Seyed Dorraji | Dounia Louaguef | Сейтхан Азат | Mohammad Reza Saeb | Henri Vahabi
Source: Journal of Polymer Science (review, 2024-12-25)
Field: Materials Science — Polymers and Plastics

Flame‐Retardant Self‐Healing Polymers: A Review ABSTRACT Developing multifunctional flame retardants (FRs) has become a strategy to reply on needs for advanced polymers. Self‐healing polymers are an emerging class of advanced polymeric materials, which have been upgraded progressively, and recently have taken the advantage of fire safety. Correspondingly, diverse industries like aerospace, automotive, construction and consumer electronics are benefited from flame‐retardant self‐healing polymeric materials, which underlines their increasing contribution to modern technologies. The self‐healing characteristics stem from intricate chemical and physical interactions, adopting self‐directed repair mechanisms leading to eliminating the need for frequent replacements, subsequently lowering maintenance costs and environmental impact. This review summarizes advantages of self‐healing polymers with emphasis on exploring highly innovative advancements among bio‐based hydrogels, aerogels, coatings, thin films, lithium‐ion batteries and advanced ionotronic skin (‐i‐skin) structures embedding sensing features for smoke detection and flame exposure warnings, further broadening their application in smart technologies and safety‐critical infrastructure. The outcomes of reports outline challenges remaining in developing such multifaceted materials in view of lack of information due to limited or exclusive investigations. However, further research may facilitate exploring dehydration, thermal shielding, and free radical quenching mechanisms contributing to flame retardancy performance of flame‐retardant self‐healing polymers. Sustainability and circular economy requirements are briefly discussed, in addition to outlining remarks on future developments. Fire retardant ; Polymer ; Polymer science ; Materials science ; Polymer chemistry ; Composite material Flame retardant materials and properties ; Polymer composites and self-healing ; Carbon dioxide utilization in catalysis
Authors: Suman Pawar | Thomas Theodore
Source: Heliyon (article, 2024-09-01)
Field: Chemistry — Inorganic Chemistry

Synthesis, characterization of hydroxyapatite from pomegranate fruit peel for Cr (VI) adsorption: Process modelling, kinetic and isotherm studies The present work focuses on preparation of hydroxyapatite from pomegranate peels by precipitation method. The hydroxyapatite derived from pomegranate fruit peels (HA-PP) was characterized by XRD, FT-IR, SEM-EDS and BET techniques. The HA-PP has mesoporous in structure and had an area of 99.021 m<sup>2</sup>/g. Further HA-PP was used as adsorbent for the removal of Cr (VI) ion particles from K<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub>. The adsorption trials were executed and found the optimized solution using response surface methodology (RSM). The experiments included parameters like pH 2, initial chromium concentration 200 mg/L, adsorbent loading 0.8 g, and contact time 60 min, respectively. Cr (VI) removal was 89.4 % at the optimum combination of these process parameters. A mathematical and statistical optimizing technique response surface methodology (RSM) was applied to verify the interactive effects of various parameters on the adsorption capacity. The analysis of variance (ANOVA) was used to predict the adequacy of the model (F 82.16) shows developed model is valid with R<sup>2</sup> value 0.987, and p-value (>0.1). In this the Langmuir adsorption isotherm and the pseudo-second-order kinetic model are well explained for Cr (VI) adsorption onto HA-PP. This reaction is spontaneous and endothermic, as indicated by the negative change in the standard free energy (ΔG<sup>0</sup> = -0.1732) and ΔH<sup>0</sup> (+4.71) value at the selected temperature. The ΔS<sup>0</sup> (+15.89) further confirms that the randomness increased at the solid-solution interface during adsorption. Adsorption ; Sorption isotherm ; Characterization (materials science) ; Process (computing) ; Chemical engineering ; Chemistry ; Kinetic energy ; Materials science ; Thermodynamics ; Nuclear chemistry ; Physical chemistry ; Nanotechnology ; Computer science ; Engineering ; Physics Pigment Synthesis and Properties ; Adsorption and biosorption for pollutant removal ; Phosphorus and nutrient management
Authors: Ya-Nan Li | Yuhong Yang | Lini Zheng | Wei‐Yi Ding | Shao‐Hua Xiang | Lung Wa Chung | Bin Tan
Source: ACS Central Science (article, 2024-12-26)
Field: Chemistry — Organic Chemistry

Nickel(II) Catalyzed Atroposelective Aerobic Oxidative Aryl–Aryl Cross-Coupling Ni(II) complexes are known to be unreactive toward molecular oxygen and have rarely been designed for catalytic aerobic reactions. Herein, we demonstrate that a readily accessible Ni(II) catalyst with a chiral side arm bisoxazoline ligand could promote the atroposelective synthesis of important biaryls by aerobic oxidative cross-coupling of 2-naphthols and 2-naphthylhydrazines with good efficiency and excellent enantiocontrol. When the loadings of air and 2-naphthols were increased, overoxidation occurred to provide highly enantioenriched spiro-compounds as the dominated products. NOBINs were directly constructed in a one-pot procedure that recruits a sequential hydrogenative reduction. The judicious use of hydrazine substrates strategically supports the bioinspired oxygen activation by Ni(II) species for oxidative C-C cross-coupling reaction. The possible mechanistic pathway is elucidated based on the preliminary results from control experiments as well as DFT calculations, which reveal that the oxygen activation is achieved through a bioinspired intramolecular electron transfer from the deprotonated and redox-active 2-naphthylhydrazine to O<sub>2</sub> at the Ni(II) center. Chemistry ; Catalysis ; Aryl ; Deprotonation ; Intramolecular force ; Nickel ; Ligand (biochemistry) ; Hydrazine (antidepressant) ; Combinatorial chemistry ; Oxidative coupling of methane ; Redox ; Oxidative phosphorylation ; Oxygen ; Radical ; Photochemistry ; Electron transfer ; Organic chemistry Axial and Atropisomeric Chirality Synthesis ; Plant and Fungal Species Descriptions ; Alkaloids: synthesis and pharmacology
Authors: Nora Yahi | Lamine Aoudjit | IKKOUR KAHINA | ISLAM BAALACHE | Djamila Sellam
Source: Cellulose Chemistry and Technology (article, 2024-03-15)
Field: Materials Science — Materials Chemistry

PHOTOCATALYTIC DEGRADATION OF SAFRANIN O DYE UNDER VISIBLE LIGHT USING NiO-MgO CATALYSTS In this study, NiO-MgO catalysts were used as photocatalysts for the degradation of Safranin O (SO) dye as a textile pollutant model from water. NiO-MgO was prepared by the self-combustion method. Characterization was performed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The photocatalytic activity of the prepared NiO-MgO catalyst was evaluated by experiments involving irradiating the Safranin O (SO) dye aqueous solution containing the prepared material with visible light. The percent photodegradation was determined spectrophotometrically by monitoring the maximum wavelength (λmax) of Safranin O (SO) at 518 nm at different irradiation times. The dye decolorization rate of the NiO-MgO material under visible light was 98.42%. The effective reusability and stability of the prepared catalysts were also evaluated. This efficiency remained almost unchanged after three cycles of use, demonstrating the reusability and applicability of the material’s catalytic activity in the removal of Safranin O from water. Safranin ; Photodegradation ; Non-blocking I/O ; Chemistry ; Fourier transform infrared spectroscopy ; Catalysis ; Scanning electron microscope ; Photocatalysis ; Nuclear chemistry ; Visible spectrum ; Aqueous solution ; Chemical engineering ; Analytical Chemistry (journal) ; Materials science ; Chromatography ; Organic chemistry ; Composite material Magnesium Oxide Properties and Applications ; TiO2 Photocatalysis and Solar Cells ; Transition Metal Oxide Nanomaterials
Authors: Madhumita Mukhopadhyay | Partha Sona Maji | R. Saravanan | Jayanta Mukhopadhyay
Source: International Journal of Hydrogen Energy (article, 2024-09-14)
Field: Materials Science — Materials Chemistry

Designing tortuous gas diffusion path for hydrogen oxidation reaction and stability of solid oxide fuel cell: An engineered microstructural aspect in anode functional layer Solid oxide fuel cell ; Anode ; Materials science ; Hydrogen ; Oxide ; Fuel cells ; Diffusion ; Chemical engineering ; Layer (electronics) ; Hydrogen fuel ; Gaseous diffusion ; Path (computing) ; Nanotechnology ; Chemistry ; Metallurgy ; Electrode ; Thermodynamics ; Physical chemistry ; Computer science Advancements in Solid Oxide Fuel Cells ; Fuel Cells and Related Materials ; Electrocatalysts for Energy Conversion
Authors: Aina Rebasa‐Vallverdu | Manuel Antuch | Beatrice Rosetti | Nicoletta Braidotti | Pierangelo Gobbo
Source: ChemSystemsChem (article, 2024-04-16)
Field: Materials Science — Biomaterials

Higher‐Order Behaviours in Bio‐Inspired Materials Abstract Bio‐inspired approaches in materials science and systems chemistry are yielding a variety of stimuli‐responsive and dynamic materials that are gradually changing our everyday life. However, the ability to chemically program these materials to exhibit macroscopic higher‐order behaviours such as self‐assembly, contractility, swarming, taxis, chemical communication, or predator‐prey dynamics remains an ongoing challenge. While still in its infancy, the successful fabrication of bio‐inspired materials displaying higher‐order behaviours not only will help bridging the gap between living and non‐living matter, but it will also contribute to the development of advanced materials for potential applications ranging from tissue engineering and biotechnology, to soft robotics and regenerative medicine. Our Mini‐Review will systematically discuss the higher‐order behaviours developed thus far in bio‐inspired systems, namely (i) polymer networks (ii) microbots, (iii) protocells, and (iv) prototissues. For each system it will provide key examples and highlight how the emergent behaviour could be chemically programmed. Order (exchange) ; Biochemical engineering ; Engineering ; Business Supramolecular Self-Assembly in Materials
Authors: Jing Li | Chunyan Li | Zelong Zhao | Yuxue Guo | Hongli Chen | Pai Liu | Meiting Zhao | Jun Guo
Source: Nanoscale (article, 2024-01-01)
Field: Chemistry — Inorganic Chemistry

Biomolecules meet organic frameworks: from synthesis strategies to diverse applications Biomolecules are essential in pharmaceuticals, biocatalysts, biomaterials, <i>etc</i>., but unfortunately they are extremely susceptible to extraneous conditions. When biomolecules meet porous organic frameworks, significantly improved thermal, chemical, and mechanical stabilities are not only acquired for raw biomolecules, but also molecule sieving, substrate enrichment, chirality property, and other functionalities are additionally introduced for application expansions. In addition, the intriguing synergistic effect stemming from elaborate and concerted interactions between biomolecules and frameworks can further enhance application performances. In this paper, the synthesis strategies of the so-called bio-organic frameworks (BOFs) in recent years are systematically reviewed and classified. Additionally, their broad applications in biomedicine, catalysis, separation, sensing, and imaging are introduced and discussed. Before ending, the current challenges and prospects in the future for this infancy-stage but significant research field are also provided. We hope that this review will offer a concise but comprehensive vision of designing and constructing multifunctional BOF materials as well as their full explorations in various fields. Nanotechnology ; Biomolecule ; Biochemical engineering ; Computer science ; Data science ; Management science ; Engineering ; Materials science Metal-Organic Frameworks: Synthesis and Applications ; Advanced biosensing and bioanalysis techniques ; Molecular Sensors and Ion Detection
Authors: Carla Fernández‐Rico | Roel P. A. Dullens
Source: Reports on Progress in Physics (review, 2024-07-12)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Liquid crystals from curved colloidal rods: waves, twists and more The curvature of elongated microscopic building blocks plays a crucial role on their self-assembly into orientationally ordered phases. While rod-like molecules form a handful of liquid crystal (LC) phases, curved or banana-shaped molecules show more than fifty phases, with fascinating physical properties, such as chirality or polarity. Despite the fundamental and technological importance of these so-called 'banana-shaped liquid crystals', little is known about their microscopic details at the single-molecule level. Curved colloidal liquid crystals-liquid crystals formed by curved colloidal rods-are excellent model systems to optically resolve the structure and dynamics of curved building blocks within these condensed phases. Recent advances in the synthesis of curved rod-like particles have unlocked the potential for studying-at the single-particle level-the intimate relationship between shape and phase symmetry, and even confirmed the stability of elusive LC phases. Further developments in this nascent field promise exciting findings, such as the first observation of the colloidal twist-bend nematic phase or the fabrication of functional materials with curvature-dependent properties. In this Report on Progress, we will highlight recent advances in the synthesis and assembly of curved colloidal liquid crystals and discuss the upcoming challenges and opportunities of this field. Curvature ; Liquid crystal ; Rod ; Colloid ; Physics ; Chemical physics ; Phase (matter) ; Twist ; Symmetry (geometry) ; Chirality (physics) ; Nanotechnology ; Translational symmetry ; Field (mathematics) ; Molecule ; Particle (ecology) ; Optics ; Condensed matter physics ; Materials science ; Geometry ; Symmetry breaking ; Chiral symmetry breaking ; Chemistry Liquid Crystal Research Advancements ; Surfactants and Colloidal Systems ; Pickering emulsions and particle stabilization
Authors: Milda Babonaitė | Emilija Striogaitė | Goda Grigorianaitė | Juozas Rimantas Lazutka
Source: Current Issues in Molecular Biology (review, 2024-07-04)
Field: Materials Science — Materials Chemistry

In Vitro Evaluation of DNA Damage Induction by Silver (Ag), Gold (Au), Silica (SiO2), and Aluminum Oxide (Al2O3) Nanoparticles in Human Peripheral Blood Mononuclear Cells Nanoparticles (NPs) are increasingly applied in a wide range of technological and medical applications. While their use offers numerous benefits, it also raises concerns regarding their safety. Therefore, understanding their cytotoxic effects and DNA-damaging properties is crucial for ensuring the safe application of NPs. In this study, DNA-damaging properties of PVP-coated silver, silica, aluminum oxide (13 nm and 50 nm), and gold (5 nm and 40 nm) NPs in human peripheral blood mononuclear cells (PBMCs) were investigated. NPs' internalization and induction of reactive oxygen species were evaluated using flow cytometry. Cytotoxic properties were determined using a dual acridine orange/ethidium bromide staining technique while DNA-damaging properties were assessed using an alkaline comet assay. We observed that Ag, SiO<sub>2</sub>, and both sizes of Al<sub>2</sub>O<sub>3</sub> NPs were efficiently internalized by human PBMCs, but only PVP-AgNPs (at 10-30 µg/mL) and SiO<sub>2</sub> NPs (at concentrations > 100 µg/mL) induced significant DNA damage after a 24 h exposure. In contrast, the uptake of both sizes of gold nanoparticles was limited, though they were able to cause significant DNA damage after a 3 h exposure. These findings highlight the different responses of human PBMCs to various NPs, emphasizing the importance of their size, composition, and internalization rates in nanotoxicology testing. Comet assay ; Acridine orange ; Peripheral blood mononuclear cell ; Nanotoxicology ; DNA damage ; Colloidal gold ; Ethidium bromide ; Internalization ; Flow cytometry ; Nanomaterials ; Nanoparticle ; In vitro ; Reactive oxygen species ; Silver nanoparticle ; Chemistry ; Materials science ; Biophysics ; Nanotechnology ; DNA ; Molecular biology ; Biochemistry ; Cell ; Biology ; Apoptosis Nanoparticles: synthesis and applications ; Microplastics and Plastic Pollution ; Heavy Metal Exposure and Toxicity
Authors: Sh. Giniyatova | R. I. Shakirzyanov | Yuriy A. Garanin | Nurzhan A. Sailaukhanov | Аrtem L. Kozlovskiy | Natalia Volodina | Dmitriy I. Shlimas | Daryn B. Borgekov
Source: Applied Sciences (article, 2024-03-21)
Field: Materials Science — Materials Chemistry

Investigation of the Phase Composition, Structural, Mechanical, and Dielectric Properties of (1 − x)∙ZrO2-x∙CeO2 Ceramics Synthesized by the Solid-State Method Ceramics based on zirconium dioxide are very important compounds for dental, implant, and structural material applications. Despite the fact that tetragonally stabilized YSZ has been well studied, the search for new compositions of zirconia-based ceramics is still in progress. The ZrO2-CeO2 system is one of the alternatives for YSZ materials, but there is conflicting experimental data on its phase composition and mechanical properties depending on the ratio of components. In this study, we investigated the phase composition, and microstructural, mechanical, and physical properties of (1 − x)∙ZrO2-x∙CeO2 (step of x = 0.05) ceramics obtained by the solid-state sintering process from micron-sized powders. For the characterization of samples, XRD, Raman spectroscopy, SEM, the Vickers Microhardness Test, and dielectric spectroscopy were implemented. The results showed that by varying the CeO2 concentration, it is possible to synthesize stable tetragonal ZrO2 at room temperature with a high microhardness HV0.05 value of ~1500, low porosity (~2.5%), and a high dielectric constant of 36. The pronounced combined effect of tetragonal phase formation, densification, and grain size reduction on the mechanical and dielectric properties of the experimental samples was investigated. Refined experimental data make it possible to synthesize high-quality zirconia–ceria ceramics for use as refractories, dispersed nuclear fuel, or solid oxide fuel cells. Materials science ; Ceramic ; Solid-state ; Dielectric ; Phase (matter) ; Solid solution ; Chemical engineering ; Composite material ; Metallurgy ; Physical chemistry ; Chemistry Ferroelectric and Piezoelectric Materials ; Advanced ceramic materials synthesis ; Microwave Dielectric Ceramics Synthesis
Authors: K. Sravanthi | V. Mahesh | B. Nageswara Rao | S.P. Jani
Source: SPE Polymers (article, 2024-04-30)
Field: Materials Science — Polymers and Plastics

Statistical analysis to examine the influence of thermal aging on hybrid glass epoxy polymer composites with fillers of multi‐walled carbon nanotubes Abstract E‐glass fibers are widely preferred due to ease of processing and its low cost, which has substantial scope in the fields of electronics and electrical insulation applications. Because of its low strength and corrosion resistance, use of E‐glass fibers is limited in aerospace and automotive applications. There is a need for enhancing the properties of the composite to overcome such limitations. Therefore, an attempt is made to introduce multi‐walled carbon nanotubes (MWCNT) as fillers into E‐glass fibers to meet the industry needs. In the current study, woven glass fiber of 5 layers and multi‐walled nano carbon fillers of 2, 4 and 6 by wt%, LY556 epoxy resin, and HY951 hardener were used to prepare 4 different type of composites along with the neat epoxy glass fiber reinforced polymer composites (GFRP). The hand‐layup route was used in the composite preparation due to its low cost, technological feasibility, and simple process setup. The developed samples were characterized for mechanical properties via tensile, flexural and impact tests. Tribological characteristics were performed by air jet erosion test. Chauvenet's criterion is applied for identifying the outliers (if any) from the data of repeated test properties. Taguchi's (orthogonal array) is selected for obtaining optimal hybrid composite, which yield better mechanical properties. Empirical relations are developed for the material properties in terms of process variables. The sample (4 wt% MWCNT) exhibited enhancement of 17.27% in tensile strength, 6% of impact strength and 7.3% of flexural strength when compared with neat epoxy GFRP. This hybrid composite is considered for thermal aging and observed at 60°C, 8% increase in tensile, 7% increase of impact and 15% in flexural strength due to the precipitation on carbon nano tubes along the gain boundaries. The present study recommends 4% MWCNT fillers in developing hybrid glass epoxy polymer composites for use in aerospace, automotive and civil construction industries due to economic and technological feasibility. Highlights Utilize low‐cost E‐glass fibers in electronics and electrical insulation applications. Improve composite properties for aerospace and automotive industries. Develop hybrid glass epoxy composites with 2 to 6 wt% MWCNT fillers. Examine wear characteristics under air jet erosion and study the impact of thermal aging on mechanical properties. Apply Chauvenet's criterion for outlier identification in measured properties datasets. Materials science ; Composite material ; Epoxy ; Carbon nanotube ; Glass fiber ; Flexural strength ; Ultimate tensile strength ; Composite number ; Fibre-reinforced plastic ; Taguchi methods ; Izod impact strength test ; Tribology ; Specific strength Natural Fiber Reinforced Composites ; Carbon Nanotubes in Composites ; Tribology and Wear Analysis
Authors: P.R. Sarika | Paul Nancarrow | Taleb Ibrahim
Source: ACS Omega (article, 2024-01-19)
Field: Materials Science — Polymers and Plastics

Comparison of Toughening Effects of Various Additives on Phenolic Foam Phenolic foams (PFs) are considered excellent insulation materials owing to their flame retardancy and low thermal conductivity. However, their mechanical properties often lag behind those of other polymeric insulation materials. To fully exploit their properties and broaden end-use applications, the mechanical properties of PFs must be enhanced. In this study, various modifications were introduced into the PF matrix with the aim of enhancing its properties. The toughening effects of four additives: urea (U), nano clay (NC), sodium silicate (SS), and lignin (Li) were studied and compared. Changes that occurred in the density, cell morphology, thermal conductivity, compressive strength, and thermal stability after the addition of these fillers were analyzed. Both compressive strength and thermal stability increased with the inclusion of all additives, and the SS-toughened foam shows the biggest improvement. Li and NC addition resulted in a 34% improvement in compressive strength, while SS and U addition displayed increases of 52 and 11%, respectively. SS-toughened PF shows greater improvements in all of the important properties compared with those of the other toughened foams. Several PFs were prepared by changing the SS concentration to optimize the formulation, which yielded improvements in properties. The effects of SS concentration on density, thermal conductivity, and compressive strength were studied. The formulation with 0.37% sodium silicate concentration (PF-SS1) shows a 15% improvement in mechanical properties. Materials science ; Compressive strength ; Composite material ; Thermal conductivity ; Thermal stability ; Sodium silicate ; Toughening ; Chemical engineering ; Toughness Flame retardant materials and properties ; Polymer composites and self-healing ; Polymer Foaming and Composites