jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Mahmoud El-Shenawy | Mohamed M. Z. Ahmed | Ahmed Nassef | Medhat A. El-Hadek | Bandar Alzahrani | Yasser Zedan | Waleed H. El-Garaihy
Source: Metals (article, 2021-06-09)
Field: Materials Science — Materials Chemistry

Effect of ECAP on the Plastic Strain Homogeneity, Microstructural Evolution, Crystallographic Texture and Mechanical Properties of AA2xxx Aluminum Alloy This study presents a comprehensive evaluation of Equal Channel Angular Pressing (ECAP) processing on the structural evolution and mechanical properties of AA2xxx aluminum alloy. Finite element analysis (FE) was used to study the deformation behavior of the AA2xxx billets during processing in addition investigate the strain homogeneity in the longitudinal and transverse direction. Billets of AA2011 aluminum alloy were processed successfully through ECAP up to 4-passes with rotating the sample 90° along its longitudinal axis in the same direction after each pass (route Bc) at 150 °C. The microstructural evolution and crystallographic texture were analyzed using the electron back-scatter diffraction (EBSD) and optical microscopy (OM). An evaluation of the hardness and tensile properties was presented and correlated with the EBSD findings and FE simulations. The FE analysis results were in good agreement with the experimental finding and microstructural evolution. Processing through 4-passes produced an ultrafine-grained structure (UFG) and a recrystallized fine grain dominated the structure coupled with a geometric grain subdivision which indicated by grain refining and very high density of substructures. This reduction in grain size was coupled with an enhancement in the hardness, tensile strength by 66.6%, and 52%, respectively compared to the as-annealed counterpart. Processing through 1-pass and 2-passes resulted in a strong texture with significant rotation for the texture components whereas 4-passes processing led to losing the symmetry of the texture with significant reduction in the texture intensity. Materials science ; Electron backscatter diffraction ; Alloy ; Microstructure ; Ultimate tensile strength ; Homogeneity (statistics) ; Metallurgy ; Grain size ; Severe plastic deformation ; Texture (cosmology) ; Pressing ; Composite material Microstructure and mechanical properties ; Aluminum Alloys Composites Properties ; Aluminum Alloy Microstructure Properties
Authors: Jiajia Shen | Zhi Zeng | Mohammadreza Nematollahi | Norbert Schell | Emad Maawad | R.N. Vasin | Keyvan Safaei | Behrang Poorganji | Mohammad Elahinia | J.P. Oliveira
Source: Additive Manufacturing Letters (article, 2021-07-14)
Field: Materials Science — Materials Chemistry

In-situ synchrotron X-ray diffraction analysis of the elastic behaviour of martensite and H-phase in a NiTiHf high temperature shape memory alloy fabricated by laser powder bed fusion High temperature shape memory alloys of the Ni-Ti-Hf system are potential candidates for aerospace applications where powder bed additive manufacturing technologies are being increasingly used. In this work, a Ti-rich NiTiHf high temperature shape memory alloy powder was processed by laser powder bed fusion. The standard heat treatment of 550 ⁰C for 3 hours was imposed to promote H-phase precipitation. At room temperature, the material has a dual-phase microstructure composed of martensite, the matrix, and H-phase, as a strengthening precipitate. High energy synchrotron X-ray diffraction is used to evaluate, in-situ, the elastic behaviour of the fabricated part. The deformation anisotropy of several (h k l) families of planes of both phases is evidenced. No major texture changes were observed upon macroscopic elastic loading. We illustrate the potential of using high energy synchrotron X-ray diffraction for detailed analyses of minority phases in additively manufactured components. Materials science ; Synchrotron ; Shape-memory alloy ; Diffraction ; Alloy ; Texture (cosmology) ; Phase (matter) ; Microstructure ; Martensite ; X-ray crystallography ; Deformation (meteorology) ; Diffusionless transformation ; Composite material ; Precipitation ; Synchrotron radiation ; Crystallography ; Optics Shape Memory Alloy Transformations ; High Entropy Alloys Studies ; Titanium Alloys Microstructure and Properties
Authors: Ambroise van Roekeghem | Jesús Carrete | Natalio Mingo
Source: Computer Physics Communications (article, 2021-03-01)
Field: Materials Science — Materials Chemistry

Quantum Self-Consistent Ab-Initio Lattice Dynamics Anharmonicity ; Ab initio ; Lattice (music) ; Quantum ; Calculator ; Python (programming language) ; Physics ; Interatomic potential ; Statistical physics ; Quantum mechanics ; Molecular dynamics ; Computer science Electronic and Structural Properties of Oxides ; Ferroelectric and Piezoelectric Materials ; Advanced Condensed Matter Physics
Authors: Ze Zheng | Andrei Komar | Khosro Zangeneh Kamali | John Noble | Lachlan Whichello | Andrey E. Miroshnichenko | Mohsen Rahmani | Dragomir N. Neshev | Lei Xu
Source: Journal of Applied Physics (article, 2021-08-05)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Planar narrow bandpass filter based on Si resonant metasurface Optically resonant dielectric metasurfaces offer unique capability to fully control the wavefront, polarization, intensity, or spectral content of light based on the excitation and interference of different electric and magnetic Mie multipolar resonances. Recent advances of the wide accessibility in nanofabrication and nanotechnologies have led to a surge in the research field of high-quality functional optical metasurfaces, which can potentially replace or even outperform conventional optical components with ultra-thin features. Replacing conventional optical filtering components with metasurface technology offers remarkable advantages, including lower integration cost, ultra-thin compact configuration, easy combination with multiple functions, and less restriction on materials. Here, we propose and experimentally demonstrate a planar narrow bandpass filter based on the optical dielectric metasurface composed of Si nanoresonators in arrays. A broadband transmission spectral valley (around 200 nm) has been realized by combining electric and magnetic dipole resonances adjacent to each other. Meanwhile, we obtain a narrow-band transmission peak by exciting a high-quality leaky mode, which is formed by partially breaking a bound state in the continuum generated by the collective longitudinal magnetic dipole resonances in the metasurface. Owing to the in-plane inversion symmetry of our nanostructure, the radiation of this antisymmetric mode is inhibited at far field, manifesting itself a sharp Fano-shape peak in the spectrum. Our proposed metasurface-based filter shows a stable performance for oblique light incidence with small angles (within 10°). Our work implies many potential applications of nanoscale photonics devices, such as displays, spectroscopy, etc. Photonics ; Nanophotonics ; Optical filter ; Dielectric ; Plasmon ; Planar ; Excitation ; Dipole ; Magnetic dipole ; Electric field Metamaterials and Metasurfaces Applications ; Plasmonic and Surface Plasmon Research ; Photonic Crystals and Applications
Authors: Jing Cui | Aqeela Afzal | Zhongliang Zu
Source: Magnetic Resonance in Medicine (article, 2021-09-30)
Field: Materials Science — Materials Chemistry

Comparative evaluation of polynomial and Lorentzian lineshape‐fitted amine CEST imaging in acute ischemic stroke The variation in opposite directions led to an insignificant correlation of the Lorentzian fit of amine CEST with APT and the different results in different experimental conditions. Amine gas treating ; Chemistry ; Arginine ; Nuclear magnetic resonance ; Analytical Chemistry (journal) ; Chromatography ; Biochemistry ; Amino acid ; Organic chemistry ; Physics Lanthanide and Transition Metal Complexes ; Advanced MRI Techniques and Applications ; Atomic and Subatomic Physics Research
Authors: Aditya Sood | C. Sievers | Yong Cheol Shin | Victoria Chen | Shunda Chen | Kirby K. H. Smithe | Sukti Chatterjee | Davide Donadio | Kenneth E. Goodson | Eric Pop
Source: ACS Nano (article, 2021-11-23)
Field: Materials Science — Materials Chemistry

Engineering Thermal Transport across Layered Graphene–MoS<sub>2</sub> Superlattices Layering two-dimensional van der Waals materials provides a high degree of control over atomic placement, which could enable tailoring of vibrational spectra and heat flow at the sub-nanometer scale. Here, using spatially resolved ultrafast thermoreflectance and spectroscopy, we uncover the design rules governing cross-plane heat transport in superlattices assembled from monolayers of graphene (G) and MoS<sub>2</sub> (M). Using a combinatorial experimental approach, we probe nine different stacking sequences, G, GG, MG, GGG, GMG, GGMG, GMGG, GMMG, and GMGMG, and identify the effects of vibrational mismatch, interlayer adhesion, and junction asymmetry on thermal transport. Pure G sequences display evidence of quasi-ballistic transport, whereas adding even a single M layer strongly disrupts heat conduction. The experimental data are described well by molecular dynamics simulations, which include thermal expansion, accounting for the effect of finite temperature on the interlayer spacing. The simulations show that an increase of ∼2.4% in the layer separation of GMGMG, relative to its value at 300 K, can lead to a doubling of the thermal resistance. Using these design rules, we experimentally demonstrate a five-layer GMGMG superlattice "thermal metamaterial" with an ultralow effective cross-plane thermal conductivity comparable to that of air. Materials science ; Thermal conductivity ; Superlattice ; van der Waals force ; Graphene ; Thermal conduction ; Molecular dynamics ; Condensed matter physics ; Thermal ; Stacking ; Nanotechnology ; Molecular physics ; Chemical physics ; Optoelectronics ; Thermodynamics ; Composite material ; Computational chemistry ; Molecule ; Chemistry ; Physics Thermal properties of materials ; Graphene research and applications ; Advanced Thermoelectric Materials and Devices
Authors: M.M. Harussani | S.M. Sapuan
Source: Chemistry Africa (article, 2021-11-10)
Field: Materials Science — Polymers and Plastics

Development of Kenaf Biochar in Engineering and Agricultural Applications Biochar ; Kenaf ; Pyrolysis ; Biomass (ecology) ; Materials science ; Environmental science ; Adsorption ; Charcoal ; Waste management ; Composite material ; Fiber ; Chemistry ; Engineering ; Agronomy Natural Fiber Reinforced Composites ; Polymer Foaming and Composites ; Thermochemical Biomass Conversion Processes
Authors: Hyun‐Do Jung
Source: Metals (article, 2021-12-02)
Field: Materials Science — Materials Chemistry

Titanium and Its Alloys for Biomedical Applications In the past decades, metals have been considered as promising materials in the fields of regenerative medicine and tissue engineering [...] Regenerative medicine ; Titanium alloy ; Materials science ; Titanium ; Nanotechnology ; Tissue engineering ; Metallurgy ; Biomedical engineering ; Engineering ; Alloy ; Biology ; Stem cell Titanium Alloys Microstructure and Properties ; Bone Tissue Engineering Materials ; Orthopaedic implants and arthroplasty
Authors: Dorota Nieciecka | Joanna Celej | Michał Żuk | Agnieszka Majkowska‐Pilip | Kinga Żelechowska-Matysiak | Antoni Lis | Magdalena Osial
Source: Pharmaceutics (article, 2021-04-01)
Field: Materials Science — Biomaterials

Hybrid System for Local Drug Delivery and Magnetic Hyperthermia Based on SPIONs Loaded with Doxorubicin and Epirubicin Cancer is one of the most common causes of death worldwide, thus new solutions in anticancer therapies are highly sought after. In this work, superparamagnetic iron oxide nanoparticles (SPIONs) conjugated with anticancer drugs are synthesized and investigated as potential magnetic drug nanocarriers for local drug delivery and mild magnetic hyperthermia. We have obtained a hybrid system loaded with holmium and anticancer drugs and thoroughly studied it with respect to the size, morphology, surface modifications and magnetic properties, and interactions with the model of biological membranes, cytotoxicity. We present that nanoparticles having a round shape and size 15 nm are successfully stabilized to avoid their agglomeration and modified with doxorubicin or epirubicin within a controlled way. The number of drugs loaded into the SPIONs was confirmed with thermogravimetry. The hybrid based on SPIONs was investigated in touch with model biological membranes within the Langmuir-Blodgett technique, and results show that modified SPION interacts effectively with them. Results obtained with magnetic hyperthermia and biological studies confirm the promising properties of the hybrid towards future cancer cell treatment. Epirubicin ; Doxorubicin ; Nanocarriers ; Drug delivery ; HeLa ; Magnetic hyperthermia ; Superparamagnetism ; Nanotechnology ; Magnetic nanoparticles ; Targeted drug delivery ; Nanomedicine ; Materials science ; Chemistry ; Nanoparticle ; Cytotoxicity ; Biophysics ; Cell ; Chemotherapy ; Medicine ; Biochemistry ; Biology ; Magnetic field ; Cyclophosphamide ; Surgery Nanoparticle-Based Drug Delivery ; Characterization and Applications of Magnetic Nanoparticles ; Blood properties and coagulation
Authors: Friné Velázquez-Contreras | Camilo Zamora‐Ledezma | Iván López-Gónzalez | Luis Meseguer‐Olmo | Estrella Núñez‐Delicado | José Antonio Gabaldón
Source: Polymers (review, 2021-12-28)
Field: Materials Science — Biomaterials

Cyclodextrins in Polymer-Based Active Food Packaging: A Fresh Look at Nontoxic, Biodegradable, and Sustainable Technology Trends Using cyclodextrins (CDs) in packaging technologies helps volatile or bioactive molecules improve their solubility, to guarantee the homogeneous distribution of the complexed molecules, protecting them from volatilization, oxidation, and temperature fluctuations when they are associated with polymeric matrices. This technology is also suitable for the controlled release of active substances and allows the exploration of their association with biodegradable polymer targeting to reduce the negative environmental impacts of food packaging. Here, we present a fresh look at the current status of and future prospects regarding the different strategies used to associate cyclodextrins and their derivatives with polymeric matrices to fabricate sustainable and biodegradable active food packaging (AFP). Particular attention is paid to the materials and the fabrication technologies available to date. In addition, the use of cutting-edge strategies, including the trend of nanotechnologies in active food packaging, is emphasized. Furthermore, a critical view on the risks to human health and the associated updated legislation is provided. Some of the more representative patents and commercial products that currently use AFP are also listed. Finally, the current and future research challenges which must be addressed are discussed. Food packaging ; Active packaging ; Homogeneous ; Legislation ; Packaging engineering ; Human health ; Nanotechnology ; Materials science ; Business ; Biochemical engineering ; Chemistry ; Engineering ; Food science ; Marketing biodegradable polymer synthesis and properties ; Microplastics and Plastic Pollution ; Nanocomposite Films for Food Packaging
Authors: Jiayan Zhao | Hang Wu | Jiulong Zhao | Yichen Yin | Zhilun Zhang | Shige Wang | Kun Lin
Source: Journal of Nanobiotechnology (article, 2021-02-03)
Field: Materials Science — Materials Chemistry

2D LDH-MoS2 clay nanosheets: synthesis, catalase-mimic capacity, and imaging-guided tumor photo-therapy Owing to the hypoxia status of the tumor, the reactive oxygen species (ROS) production during photodynamic therapy (PDT) of the tumor is less efficient. Herein, a facile method which involves the synthesis of Mg-Mn-Al layered double hydroxides (LDH) clay with MoS<sub>2</sub> doping in the surface and anionic layer space of LDH was presented, to integrate the photo-thermal effect of MoS<sub>2</sub> and imaging and catalytic functions of Mg-Mn-Al LDH. The designed LDH-MoS<sub>2</sub> (LMM) clay composite was further surface-coated with bovine serum albumin (BSA) to maintain the colloidal stability of LMM in physiological environment. A photosensitizer, chlorin e6 (Ce6), was absorbed at the surface and anionic layer space of LMM@BSA. In the LMM formulation, the magnetic resonance imaging of Mg-Mn-Al LDH was enhanced thanks to the reduced and acid microenvironment of the tumor. Notably, the ROS production and PDT efficiency of Ce6 were significantly improved, because LMM@BSA could catalyze the decomposing of the overexpressed H<sub>2</sub>O<sub>2</sub> in tumors to produce oxygen. The biocompatible LMM@BSA that played the synergism with tumor microenvironment is a promising candidate for the effective treatment of cancer. Photodynamic therapy ; Bovine serum albumin ; Photosensitizer ; Chemistry ; Reactive oxygen species ; Catalase ; Tumor hypoxia ; Tumor microenvironment ; Thermal stability ; Nuclear chemistry ; Biophysics ; Biochemistry ; Cancer research ; Photochemistry ; Enzyme ; Tumor cells ; Organic chemistry ; Internal medicine ; Medicine Layered Double Hydroxides Synthesis and Applications ; Advanced Photocatalysis Techniques ; Nanoplatforms for cancer theranostics
Authors: Assem Barakat | Ayman El‐Faham | Matti Haukka | Abdullah Mohammed Al‐Majid | Saied M. Soliman
Source: Applied Organometallic Chemistry (article, 2021-07-29)
Field: Chemistry — Organic Chemistry

<i>s</i>‐Triazine pincer ligands: Synthesis of their metal complexes, coordination behavior, and applications Pincer ligands are interesting chelating agents due to their high ability to motivate the metal ion characteristics leading to diverse types of applications. These ligands and their metal complexes are smart materials which have a great impact in the development of diverse applications helped alot in the advancement of the field of coordination chemistry. In homogenous catalytic transformations, pincer ligands improved the chemical and thermal stability that serve to minimize the leaching of the metal during the catalytic cycle. Also, they offered the ability to fine‐tune the electronic properties for the metal center, thereby increasing the scope of their coordination chemistry and applications especially the pincer ligands comprising s ‐triazine core. This review discusses some of the general synthetic protocols of these s ‐triazine pincer ligands and their metal complexes with various applications in different fields. In addition, their structural diversity and the ligand coordination behaviors with different metal ions were also explored. Chemistry ; Pincer movement ; Coordination complex ; Triazine ; Combinatorial chemistry ; Metal ; Ligand (biochemistry) ; Metal ions in aqueous solution ; Pincer ligand ; Catalysis ; Chelation ; Nanotechnology ; Polymer chemistry ; Organic chemistry ; Materials science Synthesis and Characterization of Heterocyclic Compounds ; N-Heterocyclic Carbenes in Organic and Inorganic Chemistry ; Metal-Organic Frameworks: Synthesis and Applications
Authors: Ganesh Shimoga | Ramasubba Reddy Palem | Dong‐Soo Choi | Eun‐Jae Shin | Pattan‐Siddappa Ganesh | Ganesh Dattatraya Saratale | Rijuta Ganesh Saratale | Soo‐Hong Lee | Sang‐Youn Kim
Source: Metals (article, 2021-06-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Polypyrrole-Based Metal Nanocomposite Electrode Materials for High-Performance Supercapacitors Metallic nanostructures (MNs) and metal-organic frameworks (MOFs) play a pivotal role by articulating their significance in high-performance supercapacitors along with conducting polymers (CPs). The interaction and synergistic pseudocapacitive effect of MNs with CPs have contributed to enhance the specific capacitance and cyclic stability. Among various conjugated heterocyclic CPs, polypyrrole (PPy) (prevalently knows as “synthetic metal”) is exclusively studied because of its excellent physicochemical properties, ease of preparation, flexibility in surface modifications, and unique molecular structure–property relationships. Numerous researchers attempted to improve the low electronic conductivity of MNs and MOFs, by incorporating conducting PPy and/or used decoration strategy. This was succeeded by fine-tuning this objective, which managed to get outstanding supercapacitive performances. This brief technical note epitomizes various PPy-based metallic hybrid materials with different nano-architectures, emphasizing its technical implications in fabricating high-performance electrode material for supercapacitor applications. Supercapacitor ; Polypyrrole ; Materials science ; Nanotechnology ; Nanocomposite ; Conductive polymer ; Capacitance ; Flexibility (engineering) ; Electrode ; Metal-organic framework ; Metal ; Nanostructure ; Polymer ; Composite material ; Polymerization ; Chemistry ; Organic chemistry ; Metallurgy Supercapacitor Materials and Fabrication ; Conducting polymers and applications ; Advanced Sensor and Energy Harvesting Materials
Authors: Xiaofeng Zhu | Guan‐Wen Yang | Rui Xie | Guang‐Peng Wu
Source: Angewandte Chemie International Edition (article, 2021-12-06)
Field: Materials Science — Polymers and Plastics

One‐Pot Construction of Sulfur‐Rich Thermoplastic Elastomers Enabled by Metal‐Free Self‐Switchable Catalysis and Air‐Assisted Coupling Construction of well-defined sulfur-rich macromolecules in a facile manner is an interesting but challenging topic. Herein, we disclose how to readily construct well-defined triblock sulfur-rich thermoplastic elastomers via a self-switchable isothiocyanate/episulfide copolymerization and air-assisted oxidative coupling strategy. During self-switchable polymerization, alternating copolymerization of isothiocyanate and episulfide occurs initially due to the lower energy barrier for isothiocyanate insertion with respect to successive episulfide ring-opening. After exhaustion of isothiocyanate, ring-opening polymerization of episulfide begins, providing diblock polymers. Subsequent exposure of the reaction to air leads to a transformation of diblock copolymers into triblock thermoplastic elastomers. This protocol can be extended to diverse isothiocyanates and episulfides, allowing fine-tuning of the performance of the produced sulfur-rich thermoplastic elastomers. Thermoplastic elastomer ; Copolymer ; Polymerization ; Elastomer ; Sulfur ; Materials science ; Isothiocyanate ; Polymer chemistry ; Polymer ; Macromolecule ; Thermoplastic ; Chemistry ; Organic chemistry ; Composite material Polymer composites and self-healing ; Carbon dioxide utilization in catalysis ; Synthesis and properties of polymers
Authors: Matteo Poddighe | Plinio Innocenzi
Source: Materials (review, 2021-11-11)
Field: Materials Science — Surfaces, Coatings and Films

Hydrophobic Thin Films from Sol–Gel Processing: A Critical Review Fabrication of hydrophobic thin films from a liquid phase is a hot topic with critical technological issues. Interest in the production of hydrophobic surfaces is growing steadily due to their wide applications in several industrial fields. Thin films from liquid phases can be deposited on different types of surfaces using a wide variety of techniques, while the design of the precursor solution offers the possibility of fine-tuning the properties of the hydrophobic coating layers. A general trend is the design of multifunctional films, which have different properties besides being hydrophobic. In the present review, we have described the synthesis through sol-gel processing of hydrophobic films enlightening the main achievements obtained in the field. Materials science ; Fabrication ; Thin film ; Sol-gel ; Nanotechnology ; Coating ; Chemical engineering ; Engineering Surface Modification and Superhydrophobicity ; Aerogels and thermal insulation ; Silicone and Siloxane Chemistry