jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Erque Zhao | Shanshan Li | Yingnan Dong | Kaijian Guo | He Zhang | Yunjiao Zhang | K Vojisavljevic | T Vrabelj | H Ursic | A Rmk | A Hehs | A Hab | Dan Liang | H Chen | Q | A Jj | B Mg | L Chen | A Sarve | J George | S Agrawal | K Brahim | M Gzaiel | A Oueslati | M Wu | Z Zhang | X Xu | A Kadam | N Bhosale | S Patil | E Majdi | S Elmakhloufy | A Ouasri | I Cuadra | F Martinez-Casado | J Cheda | Z Ge | S Zhan | A Bj | Chapin Korosec | Tachibana
Source: International Journal of Engineering Technology and Construction (article, 2022-09-25)
Field: Materials Science — Materials Chemistry

Research and Development of Preparation Technology of Strontium Niobate Titanate Single Crystal With the continuous warming of semiconductor research, sto has become a candidate to construct a new memristor structure due to its resistance switching phenomenon. By doping sto with metal, researchers can replace SR or Ti elements in sto. For example, sto doped with Nb, Nd, La and other elements becomes an n-type semiconductor. More and more researchers have paid attention to metal doped sto materials. Therefore, the preparation process of strontium niobate doped (SND) single crystals is researched and developed in this paper. Firstly, the optimization and mechanism of hydrothermal synthesis of strontium titanate were studied, and then the preparation process of strontium titanate doped with niobium was analyzed; Finally, the sto single crystal samples doped with 0.05%wt and 0.7%wtnb were characterized. Hall test showed that the single crystal was a donor doped semiconductor. The electrical performance test showed that the strontium niobate single crystal had excellent resistance. Strontium titanate ; Strontium ; Materials science ; Single crystal ; Nanotechnology ; Crystallography ; Thin film ; Chemistry Ferroelectric and Piezoelectric Materials ; Microwave Dielectric Ceramics Synthesis
Authors: Maha F. Abbass | Salah Al-Shukri | Ahmed A. Ahmed
Source: Zenodo (CERN European Organization for Nuclear Research) (article, 2022-03-30)
Field: Chemistry — Organic Chemistry

Selective mono substitution of cyclotri-phosphazene by 2-Hydroxyethylacrylate producing new acrylate cyclo-triphosphazene In this work, new acrylate cyclotriphosphazene moiety (PN-A) was successfully synthesized starting from cyclotriphosphazene (PN) compound. This compound reacted with 2-hydroxyethylacrylate utilizing 1:1 mole ratio to increase the priority of one substitution reaction and forming PN-A molecule. The crud product was purified by recrystallization using n-hexane and column chromatography using cyclohexane: ethyl acetate 60:40 mL ratio as eluent. The obtained pure target product was characterized using FTIR, <sup>1</sup>H NMR, <sup>13</sup>C NMR, and <sup>31</sup>P NMR techniques. All spectra demonstrates the chemical structure of the product hence the showed all required peaks to identify it. Phosphazene ; Substitution (logic) ; Acrylate ; Chemistry ; Organic chemistry ; Computer science ; Copolymer ; Polymer Organophosphorus compounds synthesis ; Synthesis and Reactivity of Sulfur-Containing Compounds ; Flame retardant materials and properties
Authors: Omar A. M. Abdelraouf | Ziyu Wang | Hailong Liu | Zhaogang Dong | Qian Wang | Ming Ye | Xiao Renshaw Wang | Qi Jie Wang | Hong Liu
Source: arXiv (Cornell University) (preprint, 2022-01-19)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Recent Advances in Tunable Metasurfaces: Materials, Design and Applications Metasurfaces, a two-dimensional (2D) form of metamaterials constituted by planar meta-atoms, exhibit exotic abilities to freely tailor electromagnetic (EM) waves. Over the past decade, tunable metasurfaces have come to the frontier in the field of nanophotonics, with tremendous effort focused on developing and integrating various active materials into metasurfaces. As a result, tunable/reconfigurable metasurfaces with multi-functionalities triggered by various external stimuli have been successfully demonstrated, openings a new avenue to dynamically manipulate and control EM waves for photonic applications in demand. In this review, we first brief the progress of tunable metasurfaces development in the last decade and highlight representative works from the perspectives of active materials development, design methodologies and application-driven exploration. Then, we elaborate on the active tuning mechanisms and relevant active materials. Next, we discuss recent achievements in theory as well as machine learning (ML) assisted design methodologies to sustain the development of this field. After that, we summarize and describe typical application areas of the tunable metasurfaces. We conclude this review by analyzing existing challenges and presenting our perspectives on future directions and opportunities in this vibrant and fast-developing field. Metamaterial ; Nanophotonics ; Computer science ; Field (mathematics) ; Nanotechnology ; Materials science ; Optoelectronics Metamaterials and Metasurfaces Applications ; Advanced Antenna and Metasurface Technologies ; Antenna Design and Analysis
Authors: Sirine Fattoum
Source: theses.fr (ABES) (article, 2022-11-23)
Field: Materials Science — Materials Chemistry

Synthesis of copper (I) oxide nanopowders for medical and electronic applications Les travaux de cette thèse portent sur la synthèse par la méthode de sonoélectrochimie pulsée déphasée de nanopoudres d’oxyde de cuivre (I) (Cu2O) pur et dopé. La première partie de l’étude concerne l’oxyde pur. Le matériau a été caractérisé par plusieurs techniques de caractérisations physico-chimiques (diffraction de rayons X, microscopie électronique en transmission, sédimentation par centrifugation en phase liquide, mesures de la surface spécifique et du potentiel zêta…) et les mêmes analyses ont été réalisées sur des matériaux commerciaux (nanopoudres de Cu2O et de Cu) pour comparaison. Ensuite, les propriétés antimicrobiennes de ces échantillons ont été étudiées à savoir les activités antibactériennes vis-à-vis de deux Grams de bactéries : Staphylococcus aureus résistant à la méthicilline (modèle de bactérie à Gram positif) et Escherichia coli (bactérie à Gram négatif) et les activités antifongiques vis-à-vis de Candida albicans. Enfin, pour compléter l’étude, la biocompatibilité a été étudiée entre les nanopoudres de Cu2O synthétisées et les cellules sanguines. Cette dernière comporte des tests d’hémolyse, d’agrégation plaquettaire et de coagulation. La suite de la thèse s’intéresse aux nanopoudres de Cu2O dopé avec du cobalt et vise à étudier leurs propriétés cristallographiques et magnétiques en fonction du taux de dopage. Les résultats ont montré que les nanopoudres de Cu2O sont de bons candidats pour des applications médicales et électroniques, tout en utilisant une méthode simple, peu coûteuse et adaptable à l’échelle industrielle. Cobalt ; Chemical reduction ; Liquid phase ; Pharmaceutical technology Copper-based nanomaterials and applications ; Laser-Ablation Synthesis of Nanoparticles ; Nanoporous metals and alloys
Authors: M. Lelis
Source:  (article, 2022-09-25)
Field: Materials Science — Materials Chemistry

Investigation of bi-layered ZnO-Ni photocatalyst powder produced by reactive magnetron sputtering technique The goal of the current study was to produce magnetic photocatalyst powder consisting of bi-layered ZnO-Ni particles for easy manipulation and collection during the repetitive photocatalytic water treatments. First, magnetron sputtering was used to cover NaCl grains by Ni underlayer and ZnO overlayer. Then the salt was washed off with distilled water. SEM, EDS and XRD analysis confirmed that obtained particles can be characterized as bi-layered open shells with nanocrystalline ZnO phase on one side and metallic Ni on the other side. In laboratory tests larger part of initial bi-layered powder were successfully recollected by magnets even after 10 consecutive usage cycles. Measurements of photocatalytic performance demonstrated relatively high activity and stability of bi-layered ZnO-Ni powder. Photocatalytic treatment of S. Typhimurium bacteria with ZnO-Ni powder and UV light in 1 hour reduced S. Typhimurium viability by more than 98 %, but similar treatment using visible light was not efficient. Photocatalysis ; Materials science ; Nanocrystalline material ; Distilled water ; Overlayer ; Sputter deposition ; Sputtering ; Chemical engineering ; Visible spectrum ; Thin film ; Optoelectronics ; Nanotechnology ; Catalysis ; Chemistry ; Chromatography ZnO doping and properties ; Advanced Photocatalysis Techniques ; Copper-based nanomaterials and applications
Authors: Rapelang Patala | Nomcebo P. Khumalo | Hlengilizwe Nyoni | Bhekie B. Mamba | Dan Liŭ | Jianzhou Gui | Alex T. Kuvarega
Source: Research Square (preprint, 2022-02-03)
Field: Chemistry — Organic Chemistry

Polysulfone Membranes With Embedded Palladium Nanoparticles for Catalytic Reduction of 4-nitrophenol Polysulfone ; Palladium ; Nitrophenol ; Membrane ; 4-Nitrophenol ; Catalysis ; Reduction (mathematics) ; Selective catalytic reduction ; Nanoparticle ; Materials science ; Chemistry ; Nanotechnology ; Organic chemistry ; Mathematics Nanomaterials for catalytic reactions ; Graphene research and applications ; MXene and MAX Phase Materials
Authors: M. Narayana
Source: International Journal of Science and Research Archive (article, 2022-12-08)
Field: Materials Science — Materials Chemistry

Effect of Sm3+ doped Ni-Cd Nano ferrite synthesis and structural characterization by citrate-gel auto combustion method Ferrite nano particles of basic composition Ni Cd Smx Fe2-xO4(0.0 ≤ x ≤ 0.05, X=0.01) where synthesized by citrate-gel auto combustion method have investigated. X-ray diffraction profile indicates that the samples are in single phase structure for the sample without Sm content. For the samples with Sm ions, some diffraction peaks appeared which belongs to the orthorhombic phase structure further, the XRD have been used calculated the lattice parameter, density and grain size. The particle size of the starting powder composition varied from 30 nm to 45 nm. The values of lattice parameter (a) decreased and X-ray density (dx) increased with the increase of Sm content. Morphology of the prepared samples by citrate-gel method was studied using scanning electron microscope (SEM). The elemental analysis of all the Ni-Cd-Sm ferrite samples with different compositions was analyzed by Energy Dispersive Spectrometer (EDS). The observed results can be explained on the basis of composition and crystal size. Orthorhombic crystal system ; Scanning electron microscope ; Materials science ; Analytical Chemistry (journal) ; Ferrite (magnet) ; Particle size ; Lattice constant ; Crystal structure ; Doping ; Diffraction ; Sol-gel ; Nanoparticle ; Crystallography ; Chemistry ; Chromatography ; Nanotechnology ; Optics Magnetic Properties and Synthesis of Ferrites ; Chalcogenide Semiconductor Thin Films ; Semiconductor materials and interfaces
Authors: Fabian Härtwig
Source:  (article, 2022-09-25)
Field: Materials Science — Materials Chemistry

Triboscopic Insights into Long-Term Tribologic Behavior of Brass/ta-C in High Vacuum It is widely known that tribological systems operating in vacuum environments face significant challenges. MoS2 is a well-known material for its low friction properties in both ambient and vacuum environments. However, it has a low wear resistance and a limited ability to withstand higher contact pressures. A possible alternative to MoS2 are super-hard hydrogen-free tetrahedral amorphous carbon coatings (ta-C). In normal atmospheric conditions, they have low friction and wear properties, but their performance in vacuum is limited. In this work, ta-C coatings are paired with brass in high vacuum conditions. Long-term tribological performance tests are conducted and analyzed using triboscopic imaging. It was found that the brass/ta-C friction pair exhibited an increase of the friction coefficient in the long term (up to 0.52) due to a change in wear mechanism. Different wear and healing behaviors could be found for both the brass counterbody and the ta-C discs using triboscopy. Brass ; Tribology ; Materials science ; Ultra-high vacuum ; Amorphous carbon ; Metallurgy ; Amorphous solid ; Friction coefficient ; Wear resistance ; Composite material ; Nanotechnology ; Chemistry ; Copper Diamond and Carbon-based Materials Research ; Metal and Thin Film Mechanics ; Advanced materials and composites
Authors: Hanna Pires Caramez Gonçalves | Cristiane de Souza Siqueira Pereira | José Thomaz De Carvalho | Hídila Souza Teixeira da Silva
Source: Revista Eletrônica TECCEN (article, 2022-06-30)
Field: Materials Science — Biomaterials

Estudo da Conversão do Óleo de Mamona (Ricinus communis L) em Polímeros uma Revisão A conversão de óleos vegetais em biopolímeros aparece como uma alternativa sustentava promissora na substituição polímeros produzida à base de petróleo. Dentre os demais óleos vegetais já conhecidos, o óleo oriundo da mamona (Ricinus communis L) apresenta um grande potencial de utilização devido à quantidade de ácidos graxos que sua estrutura apresenta especialmente o do ácido ricinoleico. A modificação do ácido ricinoleico possibilitando a conversão do óleo em diferentes polímeros. Sua obtenção é dada, geralmente, pela prensagem a frio e extração com solventes. Posteriormente o óleo é filtrado e refinado visando o aumento da estabilidade. O óleo refinado é encaminhado para as etapas de conversão, onde se inicia a síntese dos polímeros que é combinada pela sequência de operações tais como: desidratação, hidrogenação, pirólise, transesterificação e polimerização. Os polímeros obtidos podem ser classificados como: poliuretanos, poliamidas e poliésteres, e os que difere são as diferentes propriedades físicas e químicas. Esses polímeros sintetizados podem ser aplicados em diversos setores tanto industriais quanto farmacêuticos. Deste modo, esta revisão apresenta as etapas de produção desses polímeros mais frequentemente utilizadas, desde a extração do óleo como as diferentes aplicações. Physics ; Horticulture ; Chemistry ; Biology biodegradable polymer synthesis and properties
Authors: Vipul Mann | Karoline Dantas Brito | Rafiqul Gani | Venkat Venkatasubramanian
Source: ChemRxiv (preprint, 2022-04-18)
Field: Materials Science — Materials Chemistry

Hybrid, Interpretable Machine Learning for Thermodynamic Property Estimation using Grammar2vec for Molecular Representation Property prediction models have been developed for several decades with varying degrees of performance and complexity, from the group contribution-based methods to molecular simulations-based methods. An interesting issue in this area is finding an appropriate representation of molecules inherently suited for the property modeling problem. Here, we propose Grammar2vec, a SMILES grammar-based framework for generating dense, numeric molecular representations. Grammar2vec embeds molecular structural information contained in the grammar rules underlying SMILES string representations of molecules. We use Grammar2vec representations to build machine learning-based models for estimating normal boiling point (Tb) and critical temperature (Tc) and benchmark their performance against the popularly used group contribution (GC)-based methods. To ensure interpretability of the developed ML model, we perform a Shapley values-based analysis to estimate feature importance and simplify (or prune) the trained model. Interpretability ; Computer science ; Representation (politics) ; Property (philosophy) ; Feature (linguistics) ; Benchmark (surveying) ; Artificial intelligence ; Grammar ; Machine learning ; String (physics) ; Point (geometry) ; Theoretical computer science ; Natural language processing ; Mathematics Machine Learning in Materials Science ; Computational Drug Discovery Methods ; Protein Structure and Dynamics
Authors: Adnan Kurt | Murat Koca
Source: Afyon Kocatepe University Journal of Sciences and Engineering (article, 2022-06-30)
Field: Materials Science — Materials Chemistry

Thermal Degradation Kinetics of a Novel Pyrazole Based Copolymer [poly(1,3-diphenyl-1H-pyrazol-5-yl methacrylate-co-styrene)] In the present study, a new copolymer containing pyrazole substituted 1,3-diphenyl-1H-pyrazol-5-yl methacrylate (DPMA) and styrene (St) units, [poly(DPMA-co-St)], was synthesized. Thermal degradation kinetics of the copolymer system was investigated in detail with the thermogravimetric analysis (TGA) technique. An increase in the thermal stability of the copolymer from 252.02 °C to 274.89 °C was observed depending on the change in heating rate (5 °C/min – 20 °C/min). The thermal degradation activation energies of the copolymer were 149.37 kJ/mol and 140.99 kJ/mol, respectively, with the Kissinger and Flynn-Wall-Ozawa methods in the conversion range of 9% - 21%. The thermal degradation mechanism of the copolymer was investigated in the light of different kinetic methods such as Coats-Redfern, Tang, Madhusudanan, Van-Krevelen and Horowitz-Metzger. The results showed that the thermal decomposition mechanism of the copolymer proceeds through a one-dimensional diffusion-type deceleration mechanism, namely the D1 mechanism, at the optimum heating rate of 20 °C/min, especially according to the Coats-Redfern method. Copolymer ; Thermogravimetric analysis ; Kinetics ; Thermal stability ; Styrene ; Polymer chemistry ; Activation energy ; Materials science ; Thermal decomposition ; Methacrylate ; Degradation (telecommunications) ; Methyl methacrylate ; Reaction mechanism ; Diffusion ; Chemistry ; Physical chemistry ; Catalysis ; Polymer ; Organic chemistry ; Composite material ; Thermodynamics ; Physics Thermal and Kinetic Analysis ; Advanced Polymer Synthesis and Characterization ; Polymer crystallization and properties
Authors: Jingqiao Yang
Source: Highlights in Science Engineering and Technology (article, 2022-08-03)
Field: Materials Science — Materials Chemistry

Effects of Isothermal Crystallization on Carrier Transport and Breakdown Characteristics of HDPE/LDPE Insulation In this paper, the influence of the crystalline morphology of high-density polyethylene (HDPE)/low density polyethylene (LDPE) blend on its electrical conductivity, breakdown performance and trap distribution were studied by using the method of isothermal crystallization. Five HDPE/LDPE blends were prepared by melt blending method, and they were cooled to 118°C for isothermal crystallization treatment for 0, 5, 10, 20 and 40 min. The experimental results show that HDPE/LDPE blend with 10min isothermal crystallization time has the lowest conductivity at 70℃, and its conductivity-temperature dependence is also low. As the isothermal crystallization time increases from 0 to 10min, both the DC and AC breakdown strengths of HDPE/LDPE blend increase, and further increase the isothermal crystallization time to 20 and 40min, the breakdown performance of HDPE/LDPE blend decreases significantly. The aggregate structure of HDPE/LDPE blend is closely related to its electrical properties. When the isothermal crystallization time is 10 min, the HDPE/LDPE blend shows a denser crystalline morphology and introduces many of deep traps measured by the isothermal discharge current (IDC) method. Therefore, space charge accumulation and local electric field distortion in the dielectrics are reduced. Also, the breakdown field strength of the HDPE/LDPE blend is improved. Low-density polyethylene ; Materials science ; High-density polyethylene ; Crystallization ; Polyethylene ; Isothermal process ; Composite material ; Dielectric ; Chemical engineering ; Thermodynamics High voltage insulation and dielectric phenomena ; Advanced Sensor and Energy Harvesting Materials ; Electrostatic Discharge in Electronics
Authors: Rafia Rafique
Source: Pakistan Journal of Science (article, 2022-12-18)
Field: Chemistry — Analytical Chemistry

PHYTOCHEMICAL ANALYSIS AND FT-IR OF LEAF AND STEM EXTRACTS OF OLEA FERRUGINEA ROYLE &#x0D; &#x0D; &#x0D; The latest study was performed to investigate the ethno pharmacological potential of ethnobotanical significant plant, Olea ferruginea Royle that is a member of the Oleaceae family. The stem of this plant and leaf powders were macerated in different (polar and non-polar) solvents. The phytochemical study showed the occurrence of saponins, alkaloids, anthraquinonines, flavonoids, minimizing sugars, cardiac glycosides, tannins and terpenoids in reasonable quantities in Olea ferruginea, as verified by Fourier Transform Infrared (FT-IR) analysis. Based on the findings of the current research, the traditional use of this targeted plant of the Oleaceae family as food, fodder, feed, and medicinal seems acceptable and therefore justifiable.&#x0D; &#x0D; &#x0D; Olea ; Oleaceae ; Phytochemical ; Biology ; Glycoside ; Terpenoid ; Traditional medicine ; Botany ; Medicine Spectroscopy and Chemometric Analyses
Authors: Nurdan Selin KIRIK | Bünyamin Şahin
Source: DergiPark (Istanbul University) (article, 2022-05-18)
Field: Materials Science — Materials Chemistry

Nadir Toprak Elementi Ce Katkılı ZnO/CuO Kompozit İnce Filminin Yapısal, Morfolojik ve Optik Özelliklerinin İncelenmesi In this study, we report on our research of the influence of Rare-Earth element Ce-doping on the structural, morphological and optical properties of SILAR fabricated CuO/ZnO composite nanostructures.The structural, surface morphological and optical characterizations of the Ce: ZnO/CuO samples have been examined utilizing X-ray diffraction (XRD) analysis, Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and Ultraviolet–visible (UV–Vis) spectrophotometry measurements. The SEM and AFM image of the Ce: ZnO/CuO films presented that the surface morphology of the samples did not contain cracks and voids . The optical bandgap values of Ce:ZnO/ CuO nanostructured composite samples increased from 2.19 to 2.25 eV as Ce concentrations increased from 1.0 to 2.0 %. Physics ; Materials science ; Nuclear chemistry ; Chemistry Copper-based nanomaterials and applications ; Transition Metal Oxide Nanomaterials ; Infrared Target Detection Methodologies
Authors: D. Baba Basha | E. Veena | Madunuri Chandra Sekhar | A. Mallikarjuna | B. Venkata Shiva Reddy
Source: Journal of Ovonic Research (article, 2022-09-09)
Field: Materials Science — Materials Chemistry

High saturation magnetization in Ni0.2Mn0.8Fe2O4 nanoparticles The present work is focused on the synthesis of NiMn ferrite nanoparticles using hydrothermal method. The samples are examined by X-ray diffractometer (XRD), Field emission scanning electron microscope (FESEM), Transmission electron microscope (TEM), Vibrating sample magnetometer (VSM) and LCR controller in order to understand the ferrite structure, crystallite size, surface morphology, grain size, particle size, M-H loop behavior, and the variation of magnetic permeability as a function of frequency and composition. The results indicated that the high saturation magnetization is observed in case of high manganese content. Besides, the permeability versus frequency plots satisfied the Snoke's law. Nanoparticle ; Saturation (graph theory) ; Condensed matter physics ; Materials science ; Magnetization ; Nuclear magnetic resonance ; Nanotechnology ; Physics ; Mathematics ; Magnetic field ; Combinatorics ; Quantum mechanics Magnetic Properties and Synthesis of Ferrites ; Electrical and Thermal Properties of Materials ; Magneto-Optical Properties and Applications