jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Liuxiang Yang | Kah Chun Lau | Zhidan Zeng | Dongzhou Zhang | Hu Tang | Bingmin Yan | Huiyang Gou | Yanping Yang | Yuming Xiao | Duan Luo | Srilok Srinivasan | Subramanian K. R. S. Sankaranarayanan | Wenge Yang | Jianguo Wen | Ho‐kwang Mao
Source: arXiv (Cornell University) (preprint, 2021-11-17)
Field: Materials Science — Materials Chemistry

Lonsdaleite: The diamond with optimized bond lengths and enhanced hardness Diamond is known as the hardest substance due to its ultra-strong tetrahedral sp3 carbon bonding framework. The only weak link is its cubic cleavage planes between (111) buckled honeycomb layers. Compressing graphite single crystals and heating to moderate temperatures, we synthesized a bulk, pure, hexagonal diamond (lonsdaleite) with distorted carbon tetrahedrons that shorten the bond between its hexagonal (001) buckled honeycomb layers, thus strengthening their linkage. We observed direct transformation of graphite (100) to lonsdaleite (002) and graphite (002) to lonsdaleite (100). We find the bulk lonsdaleite has superior mechanical properties of Vicker hardnesses HV = 164+/-11 GPa and 124+/-13 GPa, measured on the surface corresponding to the original graphite (001) and (100) surfaces, respectively. Properties of lonsdaleite as the supreme material can be further enhanced by purifying the starting material graphite carbon and fine-tuning the high pressure-temperature synthesis conditions. Graphite ; Diamond ; Materials science ; Cleavage (geology) ; Carbon fibers ; Crystallography ; Hexagonal crystal system ; Bond cleavage ; Composite material ; Chemistry ; Organic chemistry ; Composite number Diamond and Carbon-based Materials Research ; Advanced materials and composites ; Boron and Carbon Nanomaterials Research
Authors: Adam Włodarczyk
Source: Tetrahedron (article, 2021-12-24)
Field: Chemistry — Inorganic Chemistry

Transition metal catalyzed P–C(sp2) constructing couplings Chemistry ; Catalysis ; Reactivity (psychology) ; Transition metal ; Metal ; Combinatorial chemistry ; Coupling (piping) ; Atom (system on chip) ; Stereochemistry ; Organic chemistry ; Metallurgy Asymmetric Hydrogenation and Catalysis ; Catalytic Cross-Coupling Reactions ; Organophosphorus compounds synthesis
Authors: Zhixuan Jia | Tejal Pawale | Guillermo Iván Guerrero-García | Sid Hashemi | José A. Martínez‐González | Xiao Li
Source: Crystals (article, 2021-04-12)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Engineering the Uniform Lying Helical Structure in Chiral Nematic Liquid Crystals: From Morphology Transition to Dimension Control Chiral nematic liquid crystals (CLCs), with a unique helix structure, have attracted immense recognition over the last few decades owing to the abundant presence in natural phenomena and their diverse applications. However, the optical properties of CLC are usually hindered by the abundance of the so-called fingerprint domains. Up to now, studies have worked on controlling the in-plane orientation of the lying helix through surface rubbing and external stimuli. It remains challenging to achieve a steady and uniform lying helical structure. Here, by varying the surface anchoring strength, a uniform lying helical structure with long-range order is achieved as thermodynamically stable state without any external support. Poly (6-(4-methoxy-azobenzene-4’-oxy) hexyl methacrylate) (PMMAZO)—a liquid crystalline polymer—is deposited onto the silicon substrate to fine-tune the surface anchoring. By changing the grafting density of PMMAZO, both pitch size and morphology of the lying helical structure can be controlled. As the grafting density increases, the enhanced titled deformation of helical structure suppresses the pitch size of CLC at the same cell thickness; as the cell thickness increases, the morphology transition from long-range order stripes to small fingerprint domains is facilitated. Rubbing ; Materials science ; Liquid crystal ; Helix (gastropod) ; Superstructure ; Substrate (aquarium) ; Anchoring ; Morphology (biology) ; Chemical physics ; Optics ; Crystallography ; Composite material ; Optoelectronics ; Chemistry ; Physics Liquid Crystal Research Advancements ; Advanced Materials and Mechanics ; Photonic Crystals and Applications
Authors: Augustine George | Mohan Indhu | Sundarapandian Ashokraj | Ganesh Shanmugam | Ganesan Ponesakki | Numbi Ramudu Kamini | Niraikulam Ayyadurai
Source: Bioorganic & Medicinal Chemistry (article, 2021-10-19)
Field: Chemistry — Organic Chemistry

Genetically encoded dihydroxyphenylalanine coupled with tyrosinase for strain promoted labeling Chemistry ; Dihydroxyphenylalanine ; Tyrosinase ; Biochemistry ; Strain (injury) ; Chemical synthesis ; Enzyme ; In vitro ; Dopamine Click Chemistry and Applications ; Chemical Synthesis and Analysis ; Monoclonal and Polyclonal Antibodies Research
Authors: Tyrchain Mitre Lipon | Ibakyntiew D. Marpna | Kmendashisha Wanniang | O. Risuklang Shangpliang | Badaker M. Laloo | Rishanlang Nongkhlaw | Bekington Myrboh
Source: ACS Omega (article, 2021-10-05)
Field: Chemistry — Inorganic Chemistry

Selenium Dioxide-Mediated Bromination of α,β-Unsaturated Ketones Using <i>N</i>-Bromosuccinimide in the Presence of <i>p</i>-Toluenesulfonic Acid: A Versatile Route for the Synthesis of α′-Bromo-4-arylbut-3-en-2-one and α′,α′-Dibromo-4-arylbut-3-en-2-one An efficient method for the synthesis of α,β-unsaturated α'-bromoketones and α,β-unsaturated α',α'-dibromoketones is described using <i>N</i>-bromosuccinimide (NBS) as the brominating agent mediated by selenium dioxide (SeO<sub>2</sub>) in the presence of <i>p</i>-toluenesulfonic acid (PTSA) monohydrate in toluene. The method is simple, employing easily available shelf reagents to afford a wide range of products in good yields. The method highlighted that simple fine-tuning of the reaction conditions and molar equivalents of the reactants easily affords either mono- or dibrominated products in excellent yields. A number of these products have not been reported in the literature. All of the reactions were carried out in gram-scale quantities. p-Toluenesulfonic acid ; N-Bromosuccinimide ; Halogenation ; Chemistry ; Reagent ; Selenium ; Toluene ; Organic chemistry ; Catalysis Vanadium and Halogenation Chemistry ; Oxidative Organic Chemistry Reactions ; Synthesis and Biological Evaluation
Authors: Piue Ghosh | Varsha Thambi | Ashish Kar | Arup Lal Chakraborty | Saumyakanti Khatua
Source: Optics Letters (article, 2021-08-13)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Light-induced in situ active tuning of the LSPR of gold nanorods over 90 nm We demonstrate an easy and controllable method for light-induced active tuning of the longitudinal surface plasmon resonance (LSPR) of gold nanorods (AuNRs) over ∼94<i>n</i><i>m</i>. The red-shift of the LSPR can be controlled by varying the time of exposure to a 532 nm laser. The tuning is achieved by photo-induced dissolution of individual AuNRs by sodium dodecyl sulfate (SDS) under continuous illumination. The dissolution of the AuNRs increases the aspect ratio, and consequently the LSPR exhibits a gradual but large redshift. A key feature is that it is possible to selectively tune the LSPR of a specific AuNR in a group while leaving the others totally unaffected. Such controllable, light-induced, post-synthesis fine-tuning of the LSPR is useful for tailoring the plasmonic response of individual AuNRs for a wide range of applications. Nanorod ; Materials science ; Optics ; In situ ; Colloidal gold ; Optoelectronics ; Nanotechnology ; Nanoparticle ; Chemistry ; Physics Gold and Silver Nanoparticles Synthesis and Applications ; Plasmonic and Surface Plasmon Research ; Advanced biosensing and bioanalysis techniques
Authors: Sandeep Kumar Chaluvadi | Debashis Mondal | Chiara Bigi | Jun Fujii | Rajdeep Adhikari | Regina Ciancio | A. Bonanni | G. Panaccione | G. Rossi | I. Vobornik | P. Orgiani
Source: Coatings (article, 2021-02-26)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Direct-ARPES and STM Investigation of FeSe Thin Film Growth by Nd:YAG Laser Research on ultrathin quantum materials requires full control of the growth and surface quality of the specimens in order to perform experiments on their atomic structure and electron states leading to ultimate analysis of their intrinsic properties. We report results on epitaxial FeSe thin films grown by pulsed laser deposition (PLD) on CaF2 (001) substrates as obtained by exploiting the advantages of an all-in-situ ultra-high vacuum (UHV) laboratory allowing for direct high-resolution surface analysis by scanning tunnelling microscopy (STM), synchrotron radiation X-ray photoelectron spectroscopy (XPS) and angle-resolved photoemission spectroscopy (ARPES) on fresh surfaces. FeSe PLD growth protocols were fine-tuned by optimizing target-to-substrate distance d and ablation frequency, atomically flat terraces with unit-cell step heights are obtained, overcoming the spiral morphology often observed by others. In-situ ARPES with linearly polarized horizontal and vertical radiation shows hole-like and electron-like pockets at the Γ and M points of the Fermi surface, consistent with previous observations on cleaved single crystal surfaces. The control achieved in growing quantum materials with volatile elements such as Se by in-situ PLD makes it possible to address the fine analysis of the surfaces by in-situ ARPES and XPS. The study opens wide avenues for the PLD based heterostructures as work-bench for the understanding of proximity-driven effects and for the development of prospective devices based on combinations of quantum materials. Angle-resolved photoemission spectroscopy ; X-ray photoelectron spectroscopy ; Materials science ; Scanning tunneling microscope ; Heterojunction ; Photoemission spectroscopy ; Thin film ; Epitaxy ; Substrate (aquarium) ; Synchrotron radiation ; Pulsed laser deposition ; Optoelectronics ; Nanotechnology ; Electronic structure ; Optics ; Condensed matter physics ; Physics ; Nuclear magnetic resonance Iron-based superconductors research ; Corporate Taxation and Avoidance ; Surface and Thin Film Phenomena
Authors: R.T. Mouchou | Kingsley Ukoba | Opeyeolu Timothy Laseinde | Tien‐Chien Jen
Source: International Journal of Photoenergy (article, 2021-11-26)
Field: Materials Science — Polymers and Plastics

Fabrication of p-NiO/n-TiO2 Solar Device for Photovoltaic Application Energy demand is increasing globally owing to population growth. Solar cell development has gained considerable attention because of its potential to provide everyone with sustainable, affordable, clean, and globally accessible energy. A heterojunction solar device for photovoltaic applications was developed in this study, using nickel oxide (NiO) as the p-type and titanium oxide (TiO2) as the n-type. The material chosen was motivated by the affordability, availability, and performance compared to existing silicon that is more efficient but less affordable and available. The TiO2 and NiO2 were synthesised and characterised before the deposition and characterisation of the solar cells. The characterisation was carried out using Fourier transform infrared spectroscopy (FTIR), Transmission Electron Microscopy (TEM), scanning electron microscopy (SEM), EDX, X-ray Diffraction (XRD), and a four-point probe. The deposition parameters were fine-tuned to achieve optimum optoelectronic properties for the solar device. The final device exhibited an open-circuit voltage of 370 mV, a current density of 1.7 mA, and solar cells efficiency of 3.7. Non-blocking I/O ; Nickel oxide ; Materials science ; Photovoltaic system ; Fourier transform infrared spectroscopy ; Solar cell ; Optoelectronics ; Scanning electron microscope ; Solar energy ; Nanotechnology ; Oxide ; Chemical engineering ; Chemistry ; Electrical engineering ; Metallurgy ; Composite material ; Engineering Transition Metal Oxide Nanomaterials ; ZnO doping and properties ; Copper-based nanomaterials and applications
Authors: Gabriele Barrera | Federica Celegato | Matteo Cialone | Marco Coïsson | Paola Rizzi | Paola Tiberto
Source: Nanomaterials (article, 2021-01-22)
Field: Materials Science — Materials Chemistry

Structural, Wetting and Magnetic Properties of Sputtered Fe70Pd30 Thin Film with Nanostructured Surface Induced by Dealloying Process FePd alloys in the thin film form represent a multipurpose and versatile material with relevant chemical and physical properties studied in different research fields. Moreover, the ability to manipulate and fine-tune the film surface with nanometric scale precision represents a degree of freedom useful to adapt these thin film properties to the demands of different desired applications. In this manuscript, Fe<sub>70</sub>Pd<sub>30</sub> (at. %) thin films are prepared with a thickness of 50 and 200 nm by means of the widely used co-sputtering deposition technique. Subsequently, selective removal of the iron element from the alloy and the consequent surface diffusion of the palladium was induced by a dealloying treatment under free corrosion conditions in hydrochloric acid. The size and shape of the grains of the as-deposited thin films determine the dissolution rate of the iron element with a direct consequence not only on the surface morphology and the stoichiometry of the alloy but also on the wetting and magnetic properties of the sample. X-ray diffraction, Scanning Electron Microscopy (SEM) images, contact angle and magnetic measurements have been performed to provide a thorough characterisation of the fundamental properties of these nanostructured bimetallic thin films. Materials science ; Thin film ; Wetting ; Scanning electron microscope ; Sputtering ; Alloy ; Contact angle ; Corrosion ; Dissolution ; Composite material ; Nanotechnology ; Metallurgy ; Chemical engineering Nanoporous metals and alloys ; Metallic Glasses and Amorphous Alloys ; Electrodeposition and Electroless Coatings
Authors: Shankar Khanal | Marco Sanna Angotzi | Valentina Mameli | Miroslav Veverka | Huolin L. Xin | Carla Cannas | Jana Vejpravová
Source: Nanomaterials (article, 2021-10-26)
Field: Materials Science — Materials Chemistry

Self-Limitations of Heat Release in Coupled Core-Shell Spinel Ferrite Nanoparticles: Frequency, Time, and Temperature Dependencies We explored a series of highly uniform magnetic nanoparticles (MNPs) with a core-shell nanoarchitecture prepared by an efficient solvothermal approach. In our study, we focused on the water dispersion of MNPs based on two different CoFe<sub>2</sub>O<sub>4</sub> core sizes and the chemical nature of the shell (MnFe<sub>2</sub>O<sub>4</sub> and spinel iron oxide). We performed an uncommon systematic investigation of the time and temperature evolution of the adiabatic heat release at different frequencies of the alternating magnetic field (AMF). Our systematic study elucidates the nontrivial variations in the heating efficiency of core-shell MNPs concerning their structural, magnetic, and morphological properties. In addition, we identified anomalies in the temperature and frequency dependencies of the specific power absorption (SPA). We conclude that after the initial heating phase, the heat release is governed by the competition of the Brown and Néel mechanism. In addition, we demonstrated that a rational parameter sufficiently mirroring the heating ability is the mean magnetic moment per MNP. Our study, thus, paves the road to fine control of the AMF-induced heating by MNPs with fine-tuned structural, chemical, and magnetic parameters. Importantly, we claim that the nontrivial variations of the SPA with the temperature must be considered, e.g., in the emerging concept of MF-assisted catalysis, where the temperature profile influences the undergoing chemical reactions. Materials science ; Spinel ; Nanoparticle ; Magnetic nanoparticles ; Ferrimagnetism ; Chemical engineering ; Adiabatic process ; Chemical physics ; Nanotechnology ; Magnetic field ; Magnetization ; Thermodynamics ; Chemistry Magnetic Properties and Synthesis of Ferrites ; Magnetic properties of thin films ; Characterization and Applications of Magnetic Nanoparticles
Authors: Chenjiao Ge | Xuejian Zhang | Hongyu Wang | Pooyan Safari
Source: The European Physical Journal Plus (article, 2021-09-12)
Field: Materials Science — Materials Chemistry

Stability analysis of embedded axially functionally graded nanotubes containing flow with spinning motion under an axial load based on generalized differential quadrature method Axial symmetry ; Mechanics ; Axial compressor ; Instability ; Quadrature (astronomy) ; Spinning ; Equations of motion ; Nyström method ; Parametric statistics ; Physics ; Classical mechanics ; Materials science ; Mathematical analysis ; Mathematics ; Geometry ; Optics ; Composite material Nonlocal and gradient elasticity in micro/nano structures ; Composite Structure Analysis and Optimization ; Numerical methods in engineering
Authors: Jun-Feng Yang | Zhu Tao | Carl Redshaw | Xi Zeng | Hen Luo
Source: Tetrahedron (article, 2021-10-21)
Field: Materials Science — Materials Chemistry

Color tuning and white light emission based on tetraphenylethylene-functionalized cucurbit[7]uril and FRET triggered by host-guest self-assembly Luminophore ; Chemistry ; Tetraphenylethylene ; Förster resonance energy transfer ; Photochemistry ; Acceptor ; Amphiphile ; Aqueous solution ; Rhodamine ; Luminescence ; Cucurbituril ; Fluorescence ; Perylene ; Supramolecular chemistry ; Molecule ; Organic chemistry ; Copolymer ; Optoelectronics ; Aggregation-induced emission ; Materials science Luminescence and Fluorescent Materials ; Supramolecular Chemistry and Complexes ; Molecular Sensors and Ion Detection
Authors: Hyun‐Woo Kang | Minhwan Ko | Hyobin Choi | Wanggon Lee | Ranveer Singh | Mohit Kumar | Hyungtak Seo
Source: Journal of Asian Ceramic Societies (article, 2021-07-03)
Field: Materials Science — Polymers and Plastics

Surface hydrogeneration of vanadium dioxide nanobeam to manipulate insulator-to-metal transition using hydrogen plasma This report suggests the process of hydrogen doping in vanadium dioxide (VO2) nanobeam using hydrogen plasma, and in turn reveals the modification in the structural, chemical, physical, and electrical properties of VO2 nanobeam that are associated with the different doping concentration. All V2O5 films were grown by spin-coating followed by heat treatment for the fabrication of VO2 nanobeams. Further, the hydrogen is doped using reactive ion etching process and concentration of hydrogen in VO2 is controlled by power and exposure time of ion etching. The hydrogen plasma-treated VO2 nanobeams exhibits an additional triclinic (T) phase in comparison to monoclinic (M1) phase (observed in the pristine) and shows a decrease in the ratio of V4+ ions and forming Vx+ ions (2 ≤ x ≤ 3). In addition, the measured work function of the VO2 nanobeams decreases with increasing hydrogen doping concentration. Further, the conductivity shows increasing behavior with increasing power (etching time) for a fixed etching time (power) at room temperature and the insulator-to-metal transition (IMT) temperature was found to be decrease to ~ 306 K. This study demonstrates the fine-tuning of IMT temperature just by controlling the doping concentration of hydrogen on the surface of VO2 nanobeam at 300 K. Materials science ; Hydrogen ; Doping ; Reactive-ion etching ; Vanadium ; Etching (microfabrication) ; Monoclinic crystal system ; Isotropic etching ; Analytical Chemistry (journal) ; Inorganic chemistry ; Nanotechnology ; Optoelectronics ; Crystal structure ; Crystallography ; Metallurgy ; Chemistry Transition Metal Oxide Nanomaterials ; ZnO doping and properties ; Gas Sensing Nanomaterials and Sensors
Authors: Naohiro Kameta | Wuxiao Ding | Mitsutoshi Masuda
Source: Bulletin of the Chemical Society of Japan (article, 2021-01-14)
Field: Materials Science — Biomaterials

Effect of Glycine Position on the Inner Diameter of Supramolecular Nanotubes Consisting of Glycolipid Monolayer Membranes Abstract Three novel glycolipids were synthesized by amide bond formation among a d-gluconolactone, 12-aminododecanoic acids, and a glycine. Self-assembly of the glycolipids in water produced nanotubes, in which the glycolipids were tilted, packed in parallel, and formed monolayer membranes. The inner diameters of the nanotubes were smaller in glycolipids with a shorter distance between the glycine unit and the glucose headgroup. X-ray diffraction, infrared, and circular-dichroism spectroscopy revealed that the nanotubes with smaller inner diameter had weaker intermolecular hydrogen bonds between glycolipids and larger supramolecular chirality amplified by twist packing of the tilted glycolipids within the monolayer membranes. J-type aggregates of achiral dye molecules encapsulated into nanotubes with smaller inner diameter exhibited induced circular dichroism. These findings should be useful for the fine tuning of the inner diameter of supramolecular nanotubes. Chemistry ; Glycolipid ; Monolayer ; Membrane ; Supramolecular chemistry ; Hydrogen bond ; Circular dichroism ; Crystallography ; Glycine ; Molecule ; Supramolecular chirality ; Stereochemistry ; Organic chemistry ; Biochemistry ; Amino acid Supramolecular Self-Assembly in Materials ; Polydiacetylene-based materials and applications ; Luminescence and Fluorescent Materials
Authors: Morgan R. Olsen | Ian Colliard | Tasnim Rahman | Taiki C. Miyaishi | Bryan J. Harper | Stacey L. Harper | May Nyman
Source: ACS Applied Materials & Interfaces (article, 2021-04-15)
Field: Materials Science — Materials Chemistry

Hybrid Polyoxometalate Salt Adhesion by Butyltin Functionalization Polyoxometalate (POM)-based ionic liquids, with nearly infinite compositional variations to fine-tune antimicrobial and physical properties, function as water purification filters, anticorrosion/antibacterial coatings for natural stones, self-repairing acid-resistant coatings, catalysts, and electroactive, stable solvents. By combining hydrophobic quaternary ammonium cations (QACs; tetraheptylammonium and trihexyltetradecylammonium) with butyltin-substituted polyoxotungstates [(BuSn)<sub>3</sub>(α-SiW<sub>9</sub>O<sub>37</sub>)] via repeated solvent extraction-ion exchange, we obtained phase-pure hybrid POM salts (referred to as such because they melt above room temperature). If the solvent extraction process is performed only once, then solids with high salt contamination and considerably lower melting temperatures are obtained. Solution-phase behavior, based on POM-QAC interactions, was similar for all formulations in polar and nonpolar organic solvents, as observed by X-ray scattering and multinuclear magnetic resonance spectroscopy. However, solid thin films of the butyltin-functionalized hybrid POM salts were significantly more stable and adhesive than their inorganic analogues. We attribute this to the favorable hydrophobic interactions between the butyltin groups and the QACs. All synthesized hybrid POM salts display a potent antimicrobial activity toward <i>Escherichia coli</i>. These studies provide fundamental form-function understanding of hybrid POM salts, based on interactions between ions in these complex hybrid phases. Polyoxometalate ; Materials science ; Salt (chemistry) ; Solvent ; Hybrid material ; Ionic liquid ; Extraction (chemistry) ; Phase (matter) ; Chemical engineering ; Ion exchange ; Inorganic chemistry ; Organic chemistry ; Catalysis ; Ion ; Chemistry ; Nanotechnology Polyoxometalates: Synthesis and Applications ; Vanadium and Halogenation Chemistry ; Chemical Synthesis and Reactions