jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: V. K. | Ramesh Kumar. K | Sri Vidhya. P | V Akilandeshwari. | S Amarnath. | Surya Sukumaran | S Valarmathy.
Source: International Journal of Pharmacy and Pharmaceutical Research (article, 2024-01-01)
Field: Materials Science — Materials Chemistry

Transferosomes – A Versatile and Flexible Nano Vesicular Therapeutic Delivery System Vesicular carriers based on phospholipids have been extensively studied for improved drug delivery.Liposomes, which are traditional phospholipid vesicles, are limited to the upper stratum corneum and cannot enter the deeper layers of the skin.This prompted research on Transferosomes, a unique class of ultra-deformable vesicular carriers.High concentrations of different active drugs can be delivered via this deformable vesicular carrier, which can pass through other transmucosal membranes and the deep layers of skin.It is made up of at least one inner aqueous compartment that is encircled by a lipid bilayer that has unique characteristics because the vesicular membrane has "edge activators" included in it, which facilitate the passage through membrane barriers.This study explains the conventional method of transferosome preparation, the thin film hydration technique and other modified preparation methods.Characterization of transferosomes reveals entrapment efficiency, vesicular morphology, surface charge, and drug release by In-vitro and In-vivo studies along with factors affecting the properties of transferosomes.The review presents a large number of active molecules incorporated in these carriers and investigated In vitro and Ex vivo studies. Nano- ; Nanotechnology ; Delivery system ; Computer science ; Engineering ; Materials science ; Biomedical engineering ; Chemical engineering Quantum Dots Synthesis And Properties
Authors: Xiaoming Wang | Jiajing He | Ao Wang | Kun Zhang | Yufei Sheng | Weida Hu | Chao‐Yuan Jin | Hua Bao | Yaping Dan
Source: arXiv (Cornell University) (preprint, 2024-01-11)
Field: Materials Science — Materials Chemistry

Analytical impact excitation of Er/O/B co-doped Si light emitting diodes Er doped Si light emitting diodes may find important applications in the generation and storage of quantum information. These diodes exhibit an emission efficiency two orders of magnitude higher at reverse bias than forward bias due to impact excitation. However, physics of impact excitation in these devices remains largely unexplored. In this work, we fabricated an Er/O/B co-doped Si light emitting diode which exhibits a strong electro-luminescence by the impact excitation of electrons inelastically colliding the Er ions. An analytical impact excitation theory was established to predict the electroluminescence intensity and internal quantum efficiency which fit well with the experimental data. From the fittings, we find that the excitable Er ions reach a record concentration of 1.9 x 10^19 cm-3 and up to 45% of them are in excitation state by impact excitation. This work has important implications for developing efficient classical and quantum light sources based on rare earth elements. Excitation ; Electroluminescence ; Doping ; Diode ; Light-emitting diode ; Ion ; Quantum efficiency ; Luminescence ; Materials science ; Atomic physics ; Optoelectronics ; Physics ; Nanotechnology ; Quantum mechanics Silicon Nanostructures and Photoluminescence ; Integrated Circuits and Semiconductor Failure Analysis ; Near-Field Optical Microscopy
Authors: Sophia Westendorf | Shangjing Li | Patrick Michel | Bin Hu | Marcus Scheele
Source: ChemRxiv (preprint, 2024-12-23)
Field: Materials Science — Materials Chemistry

Spectroelectrochemistry with Hydrogen-Doped Indium Oxide Electrodes Monitors Electron and Hole Injection into PbS Quantum Dots We combine potential-modulated absorption spectroscopy with working electrodes made of hydrogen-doped indium oxide on glass to study the electrochemically induced changes to the infrared absorption of ethanedithiol-crosslinked PbS quantum dot thin films. We demonstrate an electrochemical window of -1.5 V to 1 V vs. ferrocene/ferrocenium as well as a spectral window of 800 nm – 1900 nm, and we show how these ranges can be fine-tuned by tailoring the composition of the working electrode. We find evidence for the successful injection of electrons and holes into the quantum dots to a comparable degree. This enables us to locate the absolute positions of the band edges and the Fermi level for PbS quantum dots with different diameters, monitor how the band edge positions depend on the diameter and show a correlation between the position of the Fermi level with the appearance of in-gap states. We discuss the specific advantages of the technique presented here for monitoring the redox behaviour of IR-active quantum dots, detail the experimental challenges and devise strategies for their mitigation. Quantum dot ; Indium ; Materials science ; Electrode ; Doping ; Optoelectronics ; Absorption (acoustics) ; Fermi level ; Absorption spectroscopy ; Oxide ; Spectroscopy ; Electron ; Nanotechnology ; Chemistry ; Optics ; Physics Quantum Dots Synthesis And Properties ; Chalcogenide Semiconductor Thin Films ; Electrochemical Analysis and Applications
Authors: Daniel Mazur | L. V. Bekenov | B. Kh. Zhuravlov | S. V. Mokliak | Yu. M. Kucherenko | V. M. Antonov
Source: METALLOFIZIKA I NOVEISHIE TEKHNOLOGII (article, 2024-02-06)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Electronic Structure and X-ray Magnetic Circular Dichroism in A-site ordered perovskite CaCo$_{3}$V$_{4}$O$_{12}$ We are studied the electronic and magnetic properties of the A-site ordered perovskite CaCo3V4O12 within the density-functional theory using the generalized gradient approximation (GGA) with the consideration of strong Coulomb correlations (GGA + U) in the framework of the fully relativistic spinpolarized Dirac linear muffin-tin orbital method of band-structure calculation.The x-ray absorption spectra and x-ray magnetic circular dichroism at the Ca, Co, and V K-edges are investigated theoretically.The effect of the electric quadrupole E2 transitions and magnetic dipole M1 transitions are analysed.The calculated results are in good agreement with experimental data. Materials science ; Magnetic circular dichroism ; Perovskite (structure) ; X-ray magnetic circular dichroism ; Crystallography ; X-ray ; Circular dichroism ; Condensed matter physics ; Optics ; Physics ; Chemistry ; Spectral line Magnetic and transport properties of perovskites and related materials ; Advanced Condensed Matter Physics ; Electronic and Structural Properties of Oxides
Authors: Alexander Kiselev | A. A. Nevzorov | А.А. Бурцев | V. A. Mikhalevsky | N.N. Eliseev | V. V. Ionin | А. А. Лотин
Source: Письма в Журнал экспериментальной и теоретической физики (article, 2024-10-03)
Field: Materials Science — Materials Chemistry

Optically controlled fine-tuning phase shift cell based on thin-ﬁlm Ge2Sb2Te5 for light beam phase modulation Modulation (music) ; Materials science ; Phase (matter) ; Optoelectronics ; Optics ; Phase modulation ; Beam (structure) ; Thin film ; Physics ; Nanotechnology ; Quantum mechanics Phase-change materials and chalcogenides ; Optical and Acousto-Optic Technologies ; Chalcogenide Semiconductor Thin Films
Authors: Xingyu Liu | О. V. Мykhailenko | Adriana Faraone | Jérôme Waser
Source: Angewandte Chemie (article, 2024-05-29)
Field: Chemistry — Organic Chemistry

Hypervalent Iodine Amino Acid Building Blocks for Bioorthogonal Peptide Macrocyclization Abstract Ethynylbenziodoxol(on)es (EB(X)xs) reagents have emerged as useful reagents for peptide/protein modification due to their versatile reactivity and high selectivity. Herein, we report the successful introduction of ethynylbenziodoxoles (EBxs) on different amino acid building blocks (Lys/Orn/Dap), and show their compatibility with both solid phase peptide synthesis (SPPS) and solution phase peptide synthesis (SPS). The selective incorporation of the EBx core into peptide sequences enable efficient macrocyclizations under mild conditions for the synthesis of topologically unique cyclic and bicyclic peptides. Hypervalent molecule ; Bioorthogonal chemistry ; Iodine ; Chemistry ; Peptide ; Combinatorial chemistry ; Amino acid ; Stereochemistry ; Biochemistry ; Organic chemistry ; Click chemistry Click Chemistry and Applications ; Oxidative Organic Chemistry Reactions ; Chemical Synthesis and Analysis
Authors: M.B. Ioannidis | Faidra Oikonomopoulou | Telesilla Bristogianni | Marcel Bilow | Anna Maria Koniari
Source: Glass Structures & Engineering (article, 2024-09-13)
Field: Materials Science — General Materials Science

Surface and finishing quality exploration of complex cast glass forms produced on disposable moulds Abstract Glass casting displays great forming potential allowing for the realisation of three-dimensional glass elements of virtually any shape and size, as showcased in glass art. Disposable mould technology seems to be ideal for the fabrication of such customised and complex geometries, including for architectural and structural cast glass components deriving from structural topology optimization, since it offers great shape freedom and cost effectiveness. However, currently, glass casting on disposable moulds faces the major drawback of a resulting rough and opaque glass surface quality, requiring considerable post-processing to yield a glossy, smooth surface. This in turn results in a compromised dimensional accuracy and on increased time and production costs. If the surface remains unprocessed, it can greatly affect not only the visual but also the mechanical properties of the cast glass element. Aim of this research is to improve the surface quality of complex glass components cast in disposable moulds, directly during demoulding, reducing in this way the need for post-processing. To achieve this the research focuses on exploring ways to pre-process disposable moulds. In specific, the research focuses on series of kiln-cast laboratory experiments at various maximum firing temperatures / annealing schedules involving the use of two different types of disposable moulds, 3D-printed sand moulds and silica plaster moulds (Crystalcast®), and the application of refractory coatings, coating combinations and protective layers. The experimental work conducted thus far indicates that the best results are obtained at the lowest maximum temperature tested (870 °C), with the combination offering the best finishing quality to be a synthetic (ceramic) sand mould coated with Crystalcast® and Zirkofluid® (6672, 1219). Scaling-up of the kiln-cast prototypes unveils a complex correlation between the maximum dwell time at the maximum firing temperature and the casting effectivity/ performance of mould materials and coatings. Quality (philosophy) ; Surface (topology) ; Materials science ; Metallurgy ; Composite material ; Mathematics ; Geometry ; Physics Material Properties and Applications ; Additive Manufacturing and 3D Printing Technologies ; Manufacturing Process and Optimization
Authors: İbrahim Çinar
Source: Konya Journal of Engineering Sciences (article, 2024-09-01)
Field: Materials Science — Materials Chemistry

ADVANCING MEMORY DENSITY: A NOVEL DESIGN FOR MULTIPLE-BIT-PER-CELL PHASE CHANGE MEMORY Multiple-bit-per-cell phase-change memory (MPCM) has emerged as a promising solution to address the escalating demands for high-density, low-power, and fast-access memory in modern computing and data storage systems. This paper presents a novel device design aimed at enabling multiple bits per cell in phase-change memory, thereby significantly enhancing memory density while maintaining performance and reliability. Leveraging innovative material compositions and advanced fabrication techniques, the proposed design demonstrates the potential to push the boundaries of memory capacity, efficiency, and scalability. Through comprehensive simulation analysis and performance evaluations, we showcase the feasibility and advantages of the new device design, highlighting its potential to revolutionize memory architectures and meet the evolving needs of next-generation computing systems. Phase-change memory ; Computer science ; Scalability ; Reliability (semiconductor) ; Computer architecture ; Semiconductor memory ; Embedded system ; Computer data storage ; Computer hardware ; Power (physics) ; Phase change ; Operating system ; Engineering Phase-change materials and chalcogenides ; Advanced Memory and Neural Computing ; Transition Metal Oxide Nanomaterials
Authors: Leyla Majidi | Abolhassan Vaezi | Mehdi Kargarian
Source: arXiv (Cornell University) (preprint, 2024-03-14)
Field: Materials Science — General Materials Science

Stoner ferromagnetism, correlated metal and thermoelectricity in partially flat-band materials Recent discovery of correlated electronic phases in twisted heterostructures raised a surge of interests in studying models and materials with flat bands where the electronic excitations are nearly dispersionless in momentum space. As such, the kinetic energy is quenched and the correlations are enhanced, giving rise to a plethora of unusual magnetic, superconducting and transport behaviors. Finding materials whose energy bands are completely flat is rather challenging, yet those whose dispersion is flat only in a portion of the momentum space might be more accessible in material search. In this work, we propose a partially flat-band system on a square lattice. Using the Hubbard model, it is demonstrated that the suppression of the electronic kinetic energy in the flat portion of the band dispersion drives the system to Stoner ferromagnetism even at very weak interactions, i.e., much smaller than the bandwidth, with significantly enhanced Curie temperature. While the low-energy magnon modes are well defined collective excitations, flat magnon bands can be observed at high energies. We show that the strong interaction leads to reduction of the flat portion of the magnon band. However, tuning the chemical potential at a strong interaction regime may lead to spin density wave at finite wave vectors. Then, focusing on the non-magnetic correlated phase and using dynamical mean-field theory, we demonstrate the appearance of a flat-band induced sharp peak in the density of states in addition to the correlation-induced Mott bands. Furthermore, the large seebeck coefficient and the figure of merit of the proposed partially flat-band model, compared to symmetric regular band models, put them in the category of efficient thermoelectric materials. Ferromagnetism ; Condensed matter physics ; Metal ; Thermoelectric effect ; Materials science ; Physics ; Metallurgy ; Quantum mechanics Metallurgical and Alloy Processes
Authors: Anjali Bisht | Manoj Das | Suchi Yadav | Amitava Sengupta | Poonam Arora
Source:  (article, 2024-01-01)
Field: Chemistry — Spectroscopy

Improved Optical setup and electronic subsystems for reliable operation of NPLI-CsF1 Computer science ; Reliability engineering ; Engineering Spectroscopy and Laser Applications
Authors: Patrick Johansen Sarsfield | Sergey Slizovskiy | Mikito Koshino | Vladimir I. Fal’ko
Source: arXiv (Cornell University) (preprint, 2024-12-09)
Field: Materials Science — Materials Chemistry

Electronic properties of stacking faults in Bernal graphite Using the tight-binding model of graphite, incorporating all Slonczewski-Weiss-McClure parameters, we compute the spectrum of two-dimensional states of electrons bound to a stacking fault in Bernal graphite. We find that those bands retain characteristic features of the low-energy bands of a rhombohedral graphene trilayer, which actually represents the lattice structure the fault. Based on the self-consistent analysis of charge and potential distribution across the fault layers, we determine the shape of the Fermi contour for the 2D band, which has the form of three pockets with a hole-like conic dispersion and Dirac points above the Fermi level. The computed frequency of Shubnikov-de Haas oscillations and the cyclotron mass of the fault-bound charge carriers (at the Fermi level) are sufficiently different from the corresponding bulk values in graphite, making such stacking faults identifiable by quantum transport and cyclotron resonance measurements. Stacking ; Graphite ; Materials science ; Composite material ; Physics ; Nuclear magnetic resonance Graphite, nuclear technology, radiation studies ; Graphene research and applications
Authors: Anatoly Kuklov | Nikolay Prokof’ev | Boris Svistunov
Source: arXiv (Cornell University) (preprint, 2024-04-28)
Field: Materials Science — Materials Chemistry

Autonomous dynamics of two-dimensional insulating domain with superclimbing edges Superclimbing dynamics is the signature feature of transverse quantum fluids describing wide superfluid one-dimensional interfaces and/or edges with negligible Peierls barrier. Using Lagrangian formalism, we show how the essence of the superclimb phenomenon -- dynamic conjugation of the fields of the superfluid phase and geometric shape -- clearly manifests itself via characteristic modes of autonomous motion of the insulating domain (``droplet") with superclimbing edges. In the translation invariant case and in the absence of supercurrent along the edge, the droplet demonstrates ballistic motion with the velocity-dependent shape and zero bulk currents. In an isotropic trapping potential, the droplet features a doubly degenerate sloshing mode. The period of the ground-state evolution of the superfluid phase (dictating the frequency of the AC Josephson effect) is sensitive to the geometry of the droplet. The supercurrent along the edge dramatically changes the droplet dynamics: The motion acquires features resembling that of a 2D charged particle interacting with a perpendicular magnetic field. In a linear external potential (uniform force field), the state with a supercurrent demonstrates a spectacular gyroscopic effect -- uniform motion in the perpendicular to the force direction. Dynamics (music) ; Domain (mathematical analysis) ; Statistical physics ; Computer science ; Physics ; Mathematics ; Mathematical analysis ; Acoustics High voltage insulation and dielectric phenomena ; Geological Modeling and Analysis ; 3D Modeling in Geospatial Applications
Authors: Xinfei Song | Changjiang Zhao | Leran Zhao | Juncheng Liu
Source: Journal of Physics D Applied Physics (article, 2024-06-27)
Field: Materials Science — Surfaces, Coatings and Films

Effect of magnetron sputtering power on the properties of the AlO<i> <sub>X</sub> </i> monolayer and AlO<i> <sub>X</sub> </i>/MgF<sub>2</sub> bilayer anti-reflection films Abstract The AlO X monolayer anti-reflection (MLAR) films and the AlO X /MgF 2 bilayer anti-reflection (BLAR) films were deposited on high-purity glasses with magnetron sputtering. We investigated the influences of sputtering power on the O/Al molar ratio, microstructure, and optical properties of the AlO X MLAR films and AlO X /MgF 2 BLAR films. The results showed that a too high or a too low sputtering power was detrimental to the preparation of the high-quality films, which could only be obtained when the sputtering power was 115 W. However, the sputtering power did not affect the crystallinity of the films, all of which were amorphous. When the sputtering power was 115 W, the high-purity AlO X MLAR film exhibited an O/Al molar ratio of 2.27:1, a refractive index of 1.426, and an average transmittance ( T avg : average transmittance of the quartz glass deposited the film, hereinafter the same) of 94.03% within 300–1100 nm wavelength range. The T avg of AlO X /MgF 2 BLAR film with a power of 115 W was 94.99%, which was 1.92% higher than that of the glass substrate. And it improved the cell’s photoelectric conversion efficiency ( PCE ) by 3.19%. Bilayer ; Materials science ; Monolayer ; Reflection (computer programming) ; Sputter deposition ; Optoelectronics ; Cavity magnetron ; Sputtering ; Thin film ; Nanotechnology ; Chemistry ; Computer science ; Membrane Optical Coatings and Gratings ; Magnesium Oxide Properties and Applications ; Acoustic Wave Resonator Technologies
Authors: M. J. Greenall | Matthew J. Derry
Source: arXiv (Cornell University) (preprint, 2024-03-21)
Field: Chemistry — Organic Chemistry

Temperature dependence of micelle shape transitions in copolymer solutions: the role of inter-block incompatibility The nature of the transition between worm-like and spherical micelles in block copolymer dispersions varies between systems. In some formulations, heating drives a transition from worms to spheres, while in other systems the same transition is induced by cooling. In addition, a sphere-worm interconversion can be accompanied either by an increase or a decrease in the solvation of the core, even if the direction of the temperature dependence is the same. Here, self-consistent field theory is used to provide a potential explanation of this range of behaviour. Specifically, we show that, within this model, the dependence of the transition on the incompatibility $χ_{BS}$ of the solvophobic block B and the solvent S (the parameter most closely related to the temperature) is strongly influenced by the incompatibility $χ_{AB}$ between B and the solvophilic block A. When $χ_{AB}$ is small ($χ_{AB}\le 0.1$), it is found that increasing $χ_{BS}$ produces a transition from worm-like micelles to spheres (or, more generally, from less curved to more curved structures). When $χ_{AB}$ is above 0.1, increasing $χ_{BS}$ drives the system from spheres to worm-like micelles. Whether a transition is observed within a realistic range of $χ_{BS}$ is also found to depend on the fraction of solvophilic material in the copolymer. The relevance of our calculations to experimental results is discussed, and we suggest that the direction of the temperature dependence may be controlled not only by the solution behaviour of the solvophobic block (upper critical solution temperature versus lower critical solution temperature) but also by $χ_{AB}$. Copolymer ; Micelle ; Block (permutation group theory) ; Materials science ; Chemical physics ; Chemical engineering ; Polymer chemistry ; Chemistry ; Polymer ; Mathematics ; Physical chemistry ; Geometry ; Composite material ; Engineering ; Aqueous solution Surfactants and Colloidal Systems ; Advanced Polymer Synthesis and Characterization ; Analytical Chemistry and Chromatography