jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Xiao-Hui Chu | Na Gao | Wei Wang | Zhong Zheng | Jinjun Wang
Source: Royal Society Open Science (article, 2024-02-01)
Field: Chemistry — Organic Chemistry

One-pot domino syntheses of 3-alkyl-3- <i>N</i> -substituted aminobenzofuran-2(3 <i>H</i> )-ones based on alkali-promoted Michael addition and lactonization In this paper, a novel cascade reaction of caesium carbonate-promoted Michael addition and lactonization for the one-pot synthesis of 3-alkyl-3-<i>N</i>-substituted aminobenzofuran-2(3<i>H</i>)-one derivatives has been established based on the screening of the alkaline reagents and optimization of reaction conditions, in which the <i>N</i>-substituted (<i>ortho</i>-hydroxy)aryl glycine esters were used as the Michael donors to react with different <i>α</i>, β-unsaturated carbonyl compounds. In the case of using the asymmetric starting material, the epimers could be successfully separated by conventional chromatography. In addition, plausible mechanisms were suggested and the absolute configuration of the epimer was analysed. All the chemical structures of unreported benzofuran-2(3<i>H</i>)-one derivatives were characterized by <sup>1</sup>H nuclear magnetic resonance (NMR), <sup>13</sup>C NMR, IR and high-resolution mass spectrometry (HRMS). Chemistry ; Epimer ; Michael reaction ; Reagent ; Cascade reaction ; Alkyl ; Organic chemistry ; Aryl ; Medicinal chemistry ; Catalysis Synthesis of Indole Derivatives ; Synthesis of Organic Compounds ; Synthesis of heterocyclic compounds
Authors: Luca Persichetti | Daniele Paoloni | Alice Apponi | Luca Camilli | Antonio Caporale | Vitaliy Babenko | Stephan Hofmann | M. Angelucci | R. Cimino | M. De Seta | A. Ruocco | L. Di Gaspare
Source: Materials Science in Semiconductor Processing (article, 2024-01-16)
Field: Materials Science — Materials Chemistry

Probing post-growth hydrogen intercalation and H2 nanobubbles formation in graphene on Ge(110) We investigate the reproducibility of repeated intercalation of hydrogen in graphene/Ge (110) and the formation of H2 nanobubbles after thermal treatments. By exploiting high-resolution electron energy loss, we obtain direct spectroscopic fingerprints of H2 trapped gas in the samples when nanobubbles are present and we are able to track the effectiveness of H intercalation via the Ge–H vibrational mode. We correlate the effectiveness of interface re-hydrogenation to the presence of structural defects in graphene as highlighted by Raman spectroscopy. The π-plasmon mode of graphene on Ge (110) is investigated as a function of the hydrogen presence at the interface, revealing that, independent of the hydrogen intercalation status, graphene is weakly interacting on Ge (110). Graphene ; Intercalation (chemistry) ; Materials science ; Raman spectroscopy ; Hydrogen ; Chemical physics ; Electron energy loss spectroscopy ; Plasmon ; Electron ; Graphene nanoribbons ; Spectroscopy ; Nanotechnology ; Optoelectronics ; Inorganic chemistry ; Optics ; Chemistry Graphene research and applications ; ZnO doping and properties ; Electronic and Structural Properties of Oxides
Authors: Mabrouka Rejeb | R. Souissi | C. Ben Alaya | Manef Abderrabba | N. Bouguila | M. Bouaïcha
Source: International Journal of Applied Ceramic Technology (article, 2024-04-04)
Field: Materials Science — Materials Chemistry

Interesting UV and visible photodetection properties of GZO‐based device Abstract The aim of this study is to investigate the performance of chemically deposited Ga doped ZnO (GZO) thin film for enhanced UV and visible light detection. Transparent thin film was grown on glass substrates by a spray pyrolysis technique. The Ga doping concentration was maintained at 1 at.% in the solution. The influence of gallium concentration in zinc oxide (ZnO) films on structural, morphological, electrical, and optical properties was studied. Measurements of the photoconductivity were performed by DC electrical tool under visible and UV illuminations. Obtained results reported in this study on the performances of the fabricated GZO based device reveal that the photoresponse, rapidity, photosensivity, responsivity, detectivity, and reproducibility of the device are very interesting in photodetection, especially in UV wavelength domain. We notice that the device has a good responsivity as compared to detectors fabricated using other techniques, with a rather good repeatability. Furthermore, the electronic conductivity mechanism is modeled as an ohmic one. Photodetection ; Materials science ; Optoelectronics ; Visible spectrum ; Photodetector ZnO doping and properties ; Gas Sensing Nanomaterials and Sensors ; Ga2O3 and related materials
Authors: Anatoliy Ranskiy | О.М. Sandul | Оlga Gordienko | Natalia Didenko | Taras Titov
Source: Eastern-European Journal of Enterprise Technologies (article, 2024-02-28)
Field: Materials Science — General Materials Science

Development of new C, S, N-containing plastic lubricants based on products from industrial waste integrated processing The object of this research is the integrated processing of industrial waste from various industries, which makes it possible to reduce the use of material and energy resources and improve the ecological state of the environment. Waste from the chemical, petrochemical, and machine-building industries was subject to integrated technological processing. The common link that united the investigated complex technological cycles was the use of a regenerated mixed sorbent (activated carbon+kieselguhr), on the surface of which topochemical transformations of chemicals that were part of industrial waste took place. Using a regenerated mixed sorbent, exhausted industrial oil which was the mineral basis of the developed new C, S, N-containing plastic lubricants was purified. In particular, we have established the conditions for obtaining diethyl ammonium chloride from unusable pesticides of the formula R1R2R3R4C6HCOOH∙HN(C2H5)2, whose topochemical interaction on the surface of the mixed sorbent leads to the formation of a sorbed fragment [sorbent (activated carbon+kieselguhr)]∙[(C2H5)2NC(=S)SK]. Subsequent interaction of aqueous solutions containing copper(II) ions with such a fragment leads to the formation of bis–(diethyldithiocarbamate)copper(II) on the surface of mixed sorbent. The resulting substances of the general composition [sorbent (activated carbon + kieselguhr)]∙{[(С2H5)2NC(=S)S]2Cu} were studied as thickeners and active polyfunctional components of the obtained plastic lubricants. Research into the tribological properties of new C, S, N-containing plastic lubricants showed their high anti-wear and heat-resistant properties and the possibility of effective use in highly loaded friction nodes Plastic waste ; Manufacturing engineering ; Process engineering ; Engineering ; Waste management ; Environmental science ; Materials science Material Properties and Applications ; Thermal and Kinetic Analysis ; Polymer Science and Applications
Authors: Jyoti Guleria | Minhaj Ahmad Khan
Source: AIP conference proceedings (article, 2024-01-01)
Field: Materials Science — Biomaterials

Biomaterials and biopolymers in circular economy: Latest trends and applications The biomaterial is a substance which is designed to interact with the living system without giving any side-effect. Petrochemical plastics are in use for more than a century. Plastics have found use in different forms in various industries like food, cosmetics, textiles, medical sciences, engineering, and agriculture. Synthetic plastics take millions of years to degrade hence economies have switched to the production of biodegradable plastics. Present methods of synthesizing biomaterials use biological methods like microbial fermentations, which makes biomaterial synthesis and production, cost-effective and eco-friendly. The aim of this research article is to analyse the present state of research in large-scale biomaterial production and its safety for mankind and the environment. This review provides insight into the literature concerning the use of various bacteria-derived polymers and their use in the medical, healthcare, and food industry. This review will also consider the unique abilities of bacteria in using industrial waste and by-products of industries as substrate and their utilization as carbon and nitrogen source. The review will list the literature mentioning the barriers in present research based on microbial production of biomaterials and future directions to improve the production of biomaterials. Biomaterial ; Petrochemical ; Biochemical engineering ; Production (economics) ; Biotechnology ; Nanotechnology ; Engineering ; Manufacturing engineering ; Waste management ; Materials science biodegradable polymer synthesis and properties ; 3D Printing in Biomedical Research ; Bone Tissue Engineering Materials
Authors: Elavarasan Krishnasamy | Saranraj Iyyanar | Vinayagamoorthy Munusamy | Priya SD | Mohammed H. Fallah | K.P. Singh
Source: E3S Web of Conferences (article, 2024-01-01)
Field: Materials Science — Polymers and Plastics

Study on the effect of ZnO nanoparticles embedded ramie fiber reinforced epoxy matrix composite – A novel material for sustainable development This study explores the potential of Zinc Oxide (ZnO) nanoparticles as fillers in ramie fiber reinforced epoxy composites to develop materials that align with sustainable development goals. We systematically varied the ZnO nanoparticle content across three distinct samples are 5g, 10g, and 15g to investigate their effects on the mechanical and thermal properties of the composites. Mechanical testing included tensile, flexural, and impact strength assessments, while thermal stability was evaluated through thermal analysis. Additionally, Scanning Electron Microscopy (SEM) was employed to analyze the microstructural changes induced by varying nanoparticle concentrations. Preliminary results indicate that increasing the concentration of ZnO nanoparticles enhances both the thermal stability and mechanical strength of the composites, suggesting a reinforcing effect in the polymer matrix. The 15g sample displayed the most significant improvement in performance, confirming the potential of ZnO nanoparticles to create more durable and thermally stable materials. Ramie ; Epoxy ; Materials science ; Composite number ; Composite material ; Nanoparticle ; Fiber ; Matrix (chemical analysis) ; Fiber-reinforced composite ; Nanotechnology Natural Fiber Reinforced Composites ; Advanced Cellulose Research Studies ; Nanocomposite Films for Food Packaging
Authors: Prajna Bhatt | Yuhan Liu | Mark A. Isaacs | Robert G. Palgrave
Source: ChemRxiv (preprint, 2024-04-01)
Field: Materials Science — Surfaces, Coatings and Films

Correlation Analysis in X-ray Photoemission Spectroscopy X-ray photoelectron spectroscopy (XPS) is a powerful technique for surface analysis, but such analysis can be hindered by uncertainty in modelling spectra. Often, many spectral models have a similar goodness of fit, and distinguishing between them can be impossible without additional information. A further challenge is found in interpreting spectra from samples consisting of multiple chemical compounds. We show here how correlation analysis can be used to interpret large XPS datasets. Correlations in atomic concentrations and binding energies of core lines can be interpreted within a framework of an underlying chemical model and this can yield additional information compared with analysis of each spectrum individually. We give examples of the usage of this analysis on some simple systems, and discuss the potential and limitations of the technique. Angle-resolved photoemission spectroscopy ; Photoemission spectroscopy ; Inverse photoemission spectroscopy ; Spectroscopy ; Correlation ; X-ray ; X-ray photoelectron spectroscopy ; Physics ; Materials science ; Atomic physics ; Condensed matter physics ; Nuclear magnetic resonance ; Optics ; Electronic structure ; Mathematics ; Astronomy ; Geometry Electron and X-Ray Spectroscopy Techniques ; X-ray Spectroscopy and Fluorescence Analysis ; Nuclear Physics and Applications
Authors: Md. Asrafusjaman | M. A. Islam | Areef Billah | Bashir Ahmmad
Source: Royal Society Open Science (article, 2024-12-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

First-principles pressure-dependent investigation of the physical and superconducting properties of ThCr <sub>2</sub> Si <sub>2</sub> -type superconductors SrPd <sub>2</sub> X <sub>2</sub> (X = P, As) The physical and superconducting characteristics of SrPd<sub>2</sub>P<sub>2</sub> and SrPd<sub>2</sub>As<sub>2</sub> compounds with applied pressure were calculated using density functional theory. The pressure effect on the structural properties of these compounds was investigated. The results show that both lattice constants and volume decrease almost linearly with increasing pressure. The elastic constants (<i>C</i> <sub>ij</sub>) for both compounds increase with increasing pressure and satisfy Born criteria for mechanical stability. The elastic parameters indicate the ductile behaviour and anisotropic nature of these compounds under applied pressure. The Debye temperature (<i>ϴ</i> <sub>D</sub>) and melting temperature (<i>T</i> <sub>m</sub>) increase with increasing pressure. The electronic band structure calculation of both compounds exhibits metallic characteristics at different pressures. The density of electronic states at the Fermi level, <i>N</i>(<i>E</i> <sub>F</sub>), consistently decreases as pressure increases, which is also reflected in the repulsive Coulomb pseudopotential (<i>µ*</i>), and the electron-phonon coupling constant (<i>λ</i>). These optical features suggest that both compounds are suitable for optoelectronic device applications. Furthermore, the superconducting transition temperature, <i>T</i> <sub>c</sub>, for both compounds is predicted to vary with applied pressure due to changes in <i>ϴ</i> <sub>D</sub> <i>, N</i>(<i>E</i> <sub>F</sub>)<i>, µ*</i> and <i>λ</i>. Superconductivity ; Pseudopotential ; Condensed matter physics ; Debye model ; Lattice constant ; Density functional theory ; Electronic structure ; Superconducting transition temperature ; Anisotropy ; Band gap ; Density of states ; Fermi level ; Coulomb ; Materials science ; Electronic band structure ; Electron ; Chemistry ; Physics ; Computational chemistry ; Quantum mechanics Iron-based superconductors research ; Rare-earth and actinide compounds ; Superconductivity in MgB2 and Alloys
Authors: Muhammad Faiz Aizamddin | Muhamad Saipul Fakir | Nazreen Che Roslan | Ayu Natasha Ayub | Mohd Muzamir Mahat | Awis Sukarni Mohmad Sabere | Zarif Mohamed Sofian | Yee Hui Robin Chang | Mohd Ifwat Mohd Ghazali | Kishor Kumar Sadasivuni | Mohamad Arif Kasri
Source: JOURNAL OF POLYMER MATERIALS (article, 2024-01-01)
Field: Materials Science — Polymers and Plastics

Poly-3,4-ethylenedioxythiophene/Polystyrene Sulfonate/Dimethyl Sulfoxide-Based Conductive Fabrics for Wearable Electronics: Elucidating the Electrical Conductivity and Durability Properties through Controlled Doping and Washing Tests Poly-3,4-ethylenedioxythiophene: polystyrene sulfonate (PEDOT/PSS) has revolutionized the field of smart textiles as an advanced conductive polymer, offering an unprecedented combination of high electrical conductivity, solut... | Find, read and cite all the research you need on Tech Science Press Polystyrene sulfonate ; Materials science ; PEDOT:PSS ; Dimethyl sulfoxide ; Electrical conductor ; Durability ; Poly(3,4-ethylenedioxythiophene) ; Doping ; Polystyrene ; Sulfonate ; Conductivity ; Chemical engineering ; Composite material ; Optoelectronics ; Chemistry ; Organic chemistry ; Polymer ; Metallurgy ; Engineering Conducting polymers and applications ; Advanced Sensor and Energy Harvesting Materials ; Organic Electronics and Photovoltaics
Authors: Anding Li | Ruirui Liu | Liu Leo Liu | Yukun Chen | Xiao Zhou
Source: Materials (article, 2024-06-06)
Field: Materials Science — Materials Chemistry

The Effect of Sputtering Sequence Engineering in Superlattice-like Sb-Rich-Based Phase Change Materials This paper presents a comprehensive investigation into the thermal stability of superlattice-like (SLL) thin films fabricated by varying the sputtering sequences of the SLL [Ge<sub>8</sub>Sb<sub>92</sub>(25nm)/GeTe(25nm)]<sub>1</sub> and SLL [GeTe(25nm)/Ge<sub>8</sub>Sb<sub>92</sub>(25nm)]<sub>1</sub> configurations. Our results reveal significantly enhanced ten-year data retention (<i>T<sub>ten</sub></i>) for both thin films measured at 124.3 °C and 151.9 °C, respectively. These values surpass the <i>T<sub>ten</sub></i> of Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> (85 °C), clearly demonstrating the superior thermal stability of the studied SLL configurations. Interestingly, we also observe a distinct difference in the thermal stability between the two SLL configurations. The superior thermal stability of SLL [GeTe(25nm)/Ge<sub>8</sub>Sb<sub>92</sub>(25nm)]<sub>1</sub> is attributed to the diffusion of the Sb precipitated phase from Ge<sub>8</sub>Sb<sub>92</sub> to GeTe. This diffusion process effectively reduces the impact of the Sb phase on the thermal stability of the thin film. In contrast, in the case of SLL [Ge<sub>8</sub>Sb<sub>92</sub>(25nm)/GeTe(25nm)]<sub>1</sub>, the presence of the Sb precipitated phase in Ge<sub>8</sub>Sb<sub>92</sub> facilitates the crystallization of GeTe, leading to reduced thermal stability. These findings underscore the significant influence of the sputtering sequence on the atomic behavior and thermal properties of superlattice-like phase change materials. Such insights provide a robust foundation for the design and exploration of novel phase change materials with improved thermal performance. Thermal stability ; Sputtering ; Superlattice ; Materials science ; Thin film ; Thermal ; Phase (matter) ; Thermodynamics ; Optoelectronics ; Nanotechnology ; Chemical engineering ; Chemistry ; Physics Phase-change materials and chalcogenides ; Chalcogenide Semiconductor Thin Films ; Liquid Crystal Research Advancements
Authors: Md. Zakir Hossain | Ogawa Kosei
Source: ACS Omega (article, 2024-07-18)
Field: Materials Science — Materials Chemistry

Detection of Ultraviolet Light by Graphene Oxide Derived from Epitaxial Graphene on SiC and Graphite Because of their tunable band gap, flexibility, and high surface-to-volume ratio, two-dimensional materials have appeared as the most promising materials for ultraviolet (UV) light sensors. Here, we report the detection of UV light by oxidized epitaxial graphene (EG) formed on the Si-face of the SiC substrate and graphene oxide (GO) produced by Hummer oxidation of graphite. Both epitaxial graphene oxide (EGO) and GO were characterized by Raman and X-ray photoelectron spectroscopy, and the devices were made simply by placing two parallel copper electrodes onto the graphene oxide layers. Irradiation of UV light onto the graphene oxides was realized by the real-time current measurements between two electrodes at a fixed bias of 1 V. The sudden upward jump of the current (Ids) upon UV light irradiation was observed in both EGO- and GO-based devices, which were returned to the original value, while the UV source was turned OFF. The photocurrent (<i>I</i> <sub>ph</sub>), the magnitude of the current jump by the UV irradiation, for EGO, was estimated at 8 mA with a channel distance of 2 mm and UV power of 80 mW/cm<sup>2</sup>. The <i>I</i> <sub>ph</sub>linearly increases with UV power. In the case of GO, <i>I</i> <sub>ph</sub>was estimated at 0.2 nA with a similar setup. The photoresponse time and responsivity for EGO are ∼11 s and 5.6 A/W, respectively, which are higher than those of GO. The quantum efficiencies (η) for EGO and GO are calculated as 1907 and 2.3 × 10<sup>-6</sup> %, respectively, with an incident power of UV light at 9 mW/cm<sup>-2</sup>. Because of the advantages of the EG on SiC concerning the stability and wafer scale growth, the present study is expected to lead the development of lab-on-chip-based ultrasensitive UV sensors. Graphene ; Ultraviolet ; Materials science ; Graphite ; Oxide ; Graphene oxide paper ; Optoelectronics ; Ultraviolet light ; Graphite oxide ; Epitaxy ; Nanotechnology ; Composite material ; Metallurgy Graphene research and applications ; Graphene and Nanomaterials Applications ; Carbon and Quantum Dots Applications
Authors: Efrizal Siregar | Salam Irianto Nadeak | Ika Agustina | Pangawet Panjaitan
Source: KnE Engineering (article, 2024-03-07)
Field: Chemistry — Inorganic Chemistry

Manufacture of Eco-cleaner Based on Eco-enzyme Reinforced Catalyst as Reduction of Metals and Impurities on Roller and Blanked to Improve Offset Quality Offset printing machines play an important role in the printing process in the printing industry, so many industrial players make various efforts to maintain the quality of offset machine printouts. One of the efforts made is to keep the rollers and blankets on the offset machine clean from metal impurities that come from printing inks. To keep rollers and blankets clean, industry players usually use chemical fluids that can clean rollers and blankets on offset machines. However, the continuous use of chemical fluids can damage the rollers and blankets due to oxidation of these chemicals over time. This affects the printing results, such as the paper getting easily damaged, the blanket becoming sticky, the print being uneven, and the density becoming low. In addition, the cleaning chemicals used can cause environmental damage such as water pollution and soil pollution. This research synthesizes an eco-cleaner from an organic waste fermentation process reinforced with a catalyst that can be used as a substitute for the chemicals used today. This research aims to produce an eco-cleaner product that can reduce metal impurities on rollers and blankets to improve the printing quality of offset machines. The resulting product works effectively to remove metal impurities without damaging the rollers and blankets because the eco-cleaner is non-corrosive. The resulting products can be used by the public and the printing industry. The method used in this research is an experiment with the fermentation synthesis method. Furthermore, the eco-cleaner is tested for characterization for feasibility according to SNI standards. The tests carried out are the organic plating test, physical properties test, test and then analysis of the test results to see the feasibility of the eco-cleaner. Keywords: eco-cleaner, roller-blanket, printing quality, offset printing Offset (computer science) ; Impurity ; Materials science ; Catalysis ; Reduction (mathematics) ; Environmental science ; Chemistry ; Computer science ; Organic chemistry ; Mathematics Pigment Synthesis and Properties ; Additive Manufacturing and 3D Printing Technologies