Materials Chemistry - Science topic

Oxygen evolution reaction (OER) plays a key role in proton exchange membrane water electrolysis, yet the electrocatalysts still suffer from the disadvantages of low activity and poor stability in acidic conditions. Here, we have successfully fabricated a new class of CdRu 2 IrO x nanoframes with distorted structure for acidic OER. Impressively, CdR...

Rendahnya hasil belajar peserta didik di SMK Muhammadiyah 5 Babat pada pembelajaran kimia materi redoks, dikarenakan mereka mengalami kesulitan untuk memahami materi. Dalam hal ini guru masih sering menggunakan metode ceramah dan tidak melibatkan peserta didik untuk aktif dalam belajar. Penelitian ini adalah penelitian tindakan kelas yang bertujuan...

The science and technologies of emulsion droplets have been a long‐term focus of extensive research endeavors for their practical utility across a breadth of industries, including pharmaceutical products, oil recovery processes, and the food sciences. However, with advances in materials chemistry and characterization tools, new emerging areas are a...

A model to rationalize the effects of test temperature and microstructural variables on the creep crack growth (CCG) and creep-fatigue crack growth (CFCG) rates in ferritic steels is described. The model predicts that as the average spacing between grain boundary particles that initiate creep cavities decrease, the CCG and CFCG rates increase. Furt...

Frustrated, or nonoptimal, interactions have been proposed to be essential to a protein’s ability to display responsive behav-ior, such as allostery, conformational signaling, and signal transduction. However, the intentional incorporation of frustrated noncovalent interactions has not been explored as a design element in the field of dynamic folda...

Oscillatory systems regulate many biological processes, including key cellular functions such as metabolism and cell division, as well as larger-scale processes such as circadian rhythm and heartbeat1–4. Abiotic chemical oscillations, discovered originally in inorganic systems5,6, inspired the development of various synthetic oscillators for applic...

Metallocenes are highly versatile organometallic compounds. The versatility of the metallocenes stems from their ability to stabilize a wide range of formal electron counts. To date, d-block metallocenes with an electron count of up to 20 have been synthesized and utilized in catalysis, sensing, and other fields. However, d-block metallocenes with...

Metallic cellular solids, made of biocompatible alloys like titanium, stainless steel, or cobalt-chromium, have gained attention for their mechanical strength, reliability, and biocompatibility. These three-dimensional structures provide support and aid tissue regeneration in orthopedic implants, cardiovascular stents, and other tissue engineering...

Hydrosilylation with octaspherosilicate (HSiMe2O)8Si8O12 (1) has provided hundreds of molecular and macromolecular systems so far, making this method the most popular in the synthesis of siloxane-based, nanometric, cubic, and reactive building blocks. However, there are no reports on its selective reaction with 1,3-diynes, which allows for the form...

Triptycene derivatives are used extensively in supramolecular and materials chemistry, however, most are prepared using a multi-step synthesis that involves the generation of a benzyne intermediate, which hinders scale-up. Inspired by the ease of resorcinarene synthesis, we report the rapid and efficient preparation of triptycene-like 1,6,2’,7’-tet...

The rapid growth of materials chemistry data, driven by advancements in large-scale radiation facilities as well as laboratory instruments, has outpaced conventional data analysis and modelling methods, which can require enormous manual effort. To address this bottleneck, we investigate the application of supervised and unsupervised machine learnin...

Characterisation of material structure with Pair Distribution Function (PDF) analysis typically involves refining a structure model against an experimental dataset. However, finding or constructing a suitable atomic model for PDF modelling can be an extremely labour-intensive task, requiring carefully browsing through large numbers of possible mode...

Skutterudites are crystals with a cagelike structure that can be augmented with filler atoms (“rattlers”), usually leading to a reduction in thermal conductivity that can be exploited for thermoelectric applications. Here, we leverage the recently introduced Wigner formulation of thermal transport to elucidate the microscopic physics underlying hea...

There is incessant interest in the transfer of common chemical processes from organic solvents to water, which is vital for the development of bioinspired and green chemical technologies. Diarylethenes feature a rich photochemistry, including both irreversible and reversible reactions that are in demand in organic synthesis, materials chemistry, an...

The 2nd Symposium on Polydopamine is a unique conference dedicated to the latest developments in the rapidly growing field of materials chemistry, biomaterials and polymers and their applications in medicine, catalysis and energy generation/storage. The flagship catechol material that has found application in the aforementioned areas is polydopamin...

The prototypical chalcogenide perovskite BaZrS3, with its direct band gap, exceptionally strong light-harvesting ability and good carrier transport properties, provides fundamental prerequisites for a promising photovoltaic material. This inspired synthesis of BaZrS3 in the form of thin films, using sputtering and rapid thermal processing, aimed at...

In order to achieve low refractive index detection in biomedical and material chemistry, a D-type microstructured optical fiber (MOF) sensor based on surface plasmon resonance (SPR) is proposed in this paper. The sensor uses gold nanofilm as sensing material between the core of the fiber and the plasma on the surface, and is coated at the open ring...

The construction of hypothetical environments to produce organic molecules such as metabolic intermediates or amino acids is the subject of ongoing research into the emergence of life. Experiments specifically focused on an anabolic approach typically rely on a mineral catalyst to facilitate the supply of organics that may have produced prebiotic b...

Defects determine many important properties and applications of materials, ranging from doping in semiconductors, to conductivity in mixed ionic-electronic conductors used in batteries, to active sites in catalysts. The theoretical description of defect formation in crystals has evolved substantially over the past century. Advances in supercomputin...

Knowing oxide-forming ability is vital to gain desired or avoid deleterious oxides formation through tuning oxidizing environment and materials chemistry. Here, we have conducted a comprehensive thermodynamic analysis of 137 binary oxides using the presently predicted Ellingham diagrams. It is found that the active elements to form oxides easily ar...

X-ray microspectroscopic techniques are essential for studying morphological and chemical changes in materials, providing high-resolution structural and spectroscopic information. However, its practical data analysis for reliably retrieving the chemical states remains a major obstacle to accelerating the fundamental understanding of materials in ma...

Connecting organic building blocks by covalent bonds to design porous crystalline networks has led to covalent organic frameworks (COFs), consequently transferring the flexibility of dynamic linkages from discrete architectures to extended structures. By virtue of the library of organic building blocks and the diversity of dynamic linkages and topo...

The addition of polyetheretherketone (PEEK) filler to polytetrafluoroethylene (PTFE) is known to result in an orders-of-magnitude decrease in dry sliding wear of PTFE. Unlike similar ultra-low wear PTFE composites, PEEK as a filler is particularly effective since ultra-low wear of PEEK–PTFE is insensitive to environmental moisture. Mechanisms of lo...

Background: Applying 3D printed bioink to bone tissue engineering is an emerging technology for restoring bone tissue defects. This study aims to evaluate the application of 3D printing bioink in bone tissue engineering from 2010 to 2022 through bibliometric analysis, and to predict the hotspots and developing trends in this field. Methods: We retr...

Defects determine many important properties and applications of materials, ranging from doping in semiconductors, to conductivity in mixed ionic-electronic conductors used in batteries, to active sites in catalysts. The theoretical description of defect formation in crystals has evolved substantially over the past century. Advances in supercomputin...

Soutenu le 22/09/2015 devant le jury composé de : M me HAMADOU Lamia MCA-U.M.M.T.O Présidente M me MELLIL Baya MCB-U.M.M.T.O Rapporteur M me BENBRAHIM Nassima Professeur-U.M.M.T.O Examinatrice M r BOUDINAR Salem Docteur-UMMTO Invité Session : Septembre 2015 N° d'ordre : REPUBLIQUE ALGERIENNE DEMOCRATIQUE ET POPULAIRE MINISTERE DE L'ENSEIGNEMENT SUP...

Objectives The introduction of hydraulic cement sealers has increased the popularity of single cone obturation where the chemistry and properties of hydraulic cement sealers are crucial. This article has investigated the materials present on the market by reviewing the chemistry aiming at understanding whether these materials are optimized or have...

Polycyclic aromatic hydrocarbons (PAHs) are important compounds in materials chemistry, particularly for optoelectronic applications. One strategy for tuning PAH properties involves the net exchange of carbon atoms for heteroatoms, such as nitrogen. We report a comparative study of the well-known fluorophore 9,10-diphenylanthracene with an aza anal...

Lightweight and flexible electronic materials with high energy attenuation hold an unassailable position in electromagnetic stealth and intelligent devices. Among them, emerging heterodimensional structure draws intensive attention in the frontiers of materials, chemistry, and electronics, owing to the unique electronic, magnetic, thermal, and opti...

In order to achieve low refractive index detection in biomedical and material chemistry, a D-type microstructured optical fiber (MOF) sensor based on surface plasmon resonance (SPR) is proposed in this paper. The sensor uses gold nanofilm as sensing material between the core of the fiber and the plasma on the surface, and is coated at the open-ring...

The inception of an unprecedented class of voluminous Platonic solids displaying hierarchical geometry based on pyrogallol[4]arene moieties seamed by divalent calcium ion is described. Single-crystal X-ray structural determination has established the highly conserved geometry of two original Ca²⁺-seamed nanocapsules to be essentially cubic in shape...

Ultrasound (US)-triggered cascade amplification of nanotherapies has attracted considerable attention as an effective strategy for cancer treatment. With the remarkable advances in materials chemistry and nanotechnology, a large number of well-designed nanosystems have emerged that incorporate presupposed cascade amplification processes and can be...

Silanols are key players in the application performance of zeolites, yet, their localization and hydrogen bonding strength need more studies. The effects of post-synthetic ion exchange on nanosized chabazite (CHA), focusing on the formation of silanols, were studied. The significant alteration of the silanols of the chabazite nanozeolite upon ion e...

In recent years, Web of Science has published nearly one hundred reports per year on quinoxalin-2(1H)-ones, which have attracted great interest due to their wide applications in pharmaceutical and materials fields, especially in recyclable heterogeneous catalytic reactions for direct C-H functionalisation. This review summarises for the first time...

Despite meloxicam’s many benefits, it will cause many drawbacks if the meloxicam release rate is not controlled. Accordingly, we introduced a technique based on the electrospinning process to control the release rate and also to reduce side effects. For this purpose, different nanofibers were used as drug couriers. Nanofibers were prepared using po...

In comparison with all-carbon parent compounds, the incorporation of Si-element into carboskeletons generally endows the corresponding sila-analogues with unique biological activity and physical-chemical properties. Silacycles have recently shown promising application potential in biological chemistry, pharmaceuticals industry, and material chemist...

Having access to accurate electron densities in chemical systems, especially for dynamical systems involving chemical reactions, ion transport, and other charge transfer processes, is crucial for numerous applications in materials chemistry. Traditional methods for computationally predicting electron density data for such systems include quantum me...

Machine learning is an emerging tool in the field of materials chemistry for uncovering a principle from large datasets. Here, we focus on the spherical precipitation behavior of polymers and computationally extract a hidden trend that is orthogonal to the availability bias in the chemical space. For constructing a dataset, four polymers were preci...

Multimetallic clusters play a key role as models to doped metals, as candidates to new types of superatomic catalysts and as precursors to new multimetallic solids. Understanding formation pathways is an essential and necessary step forward in the development of cluster synthesis and research, yet remains considerably lacking owing to difficulty in...

There is growing interest in using corrosion inhibitors and protective treatments to limit the degradation of mild steel, leading to the development of numerous Schiff bases as cutting-edge inhibitors. In this study, the effectiveness of a Schiff base, 3-((5-mercapto-1,3,4-thiadiazol-2-yl)imino)indolin-2-one (MTIO), to prevent mild steel corrosion...

A robust imaging protocol utilizing laboratory XCT is presented. Hybrid 2D/3D imaging at different scales with real-time monitoring allowed to assess, in operation, the evolution of zinc electrodes within three environments, namely alkaline, near-neutral, and mildly acidic. Different combinations of currents were used to demonstrate various scenari...

Designing and developing green methodologies to synthesize biologically and pharmacologically active heterocyclic moieties is the need of the hour. Green method at first involves the use of green heterogeneous nano catalyst on a solid support, making the process sustainable. Multicomponent reaction is the second step towards the greener process, wh...

Cobalt-doped titania nanocomposites were fabricated to be utilized for radiation shielding aims. The chemical composition of the composites was measured using the energy-dispersive X-ray spectrometer. Moreover, the structure of the composites was evaluated using the X-ray diffractometer, and the morphology of the fabricated composites was presented...

MAX/MAB phases are a series of non-van der Waals ternary layered ceramic materials with a hexagonal structure, rich in elemental composition and atomic structure, and embody the physical properties of both ceramics and metals. They exhibit great potential for applications in extreme environments such as high temperature, strong corrosion, and irrad...

In the present study, flax fiber based semicarbazide biosorbent was prepared in two successive steps. In the first step, flax fibers were oxidized using potassium periodate (KIO4) to yield diadehyde cellulose (DAC). Dialdehyde cellulose was, then, refluxed with semicarbazide.HCl to produce the semicarbazide functionalized dialdehyde cellulose (DAC@...

Certain types of ceramics have property that shows direct bonding to living bone tissue in vivo, and are referred to as bioactive materials. As a bioactive material, Bioglass® was discovered and developed in early 1970’s, inorganic glasses and materials based on them have been studied for bone substitutes for tissue repairing. In addition, elucidat...

Ce travail révèle des actualités sur les études de recherche portant sur l’évaluation de l’efficacité de la phytothérapie contre la nouvelle pandémie de Covid-19. Nous avons utilisé les serveurs SwissADME, pkCSM et ProTox II pour l’analyse des propriétés ADME-T des principes actifs de plantes médicinales algériennes à potentiel antiseptique. Les ré...

Nanomaterials are highly promising for potential large-scale employment in a wide range of technological, medicinal, and pharmaceutical applications. While different approaches have been employed for nanomaterials synthesis, green protocols have received significant attention as they address the clean and sustainable environmental aspects, and offe...

In the field of heterocyclic synthesis, alkynyl aldehydes serve as privileged reagents for cyclization reactions with other organic compounds to construct a broad spectrum of N-, O-, and S-heterocycles. Due to the immense application of heterocyclic molecules in pharmaceuticals, natural products, and material chemistry, the synthesis of such scaffo...

It has been about 36 years since the first published paper about the calorimetry and adsorption (Cal-Ad) method by Prof. Drago. These separated methods are very old and important characterization tools for different molecules and materials, as recognized in chemistry. The idea of coupling these two techniques arose from the need to have more inform...

Cobalt, from industrial waste and nuclear laundry, possess health risk to human beings, animals and plants. Number of methods, other than adsorption, have been reported in literature for Co removal from waste water. In this research walnut shell powder after modification has been utilized for Co adsorption. First step of modification involved chemi...

We're currently looking for highly-motivated students of chemistry, who are interested in joining our research group at the doctoral (PhD.) level and would like to work in the field of organic, inorganic, or materials chemistry, with an emphasis on the preparation of materials for modern laser technologies, dye-sensitized solar cells and/or sensiti...

Materials synthesis via liquid-like mineral precursors has been studied since their discovery almost 25 years ago, because their properties offer several advantages, e.g., the ability to infiltrate small pores, the production of non-equilibrium crystal morphologies or mimicking textures from biominerals, resulting in a vast range of possible applic...

To realize sustainable development, more and more countries forwarded carbon neutrality goal. Accordingly, improving the utilization efficiency of traditional fossil fuel is an effective strategy for this great goal. Keeping this in mind, developing thermoelectric devices to recover waste heat energy resulted in the consumption process of fuel is d...

(The published version of this preprint is now available at link https://doi.org/10.1016/j.mtcomm.2023.106552) In materials chemistry and physics, discussing the results of X-ray techniques is a routine job. In the thin film, powder, bulk, or another form of material, suitable electronic rings of the atoms forming the top-layered surface experience...

We’re currently looking for highly-motivated students of chemistry, who are interested in joining our research group at the doctoral (PhD.) level and would like to work in the field of organic, inorganic, or materials chemistry, with an emphasis on the preparation of materials for modern laser technologies, dye-sensitized solar cells and/or sensiti...

Mechanochemistry is a rapidly emerging synthetic approach that gained momentum in organic synthesis, catalysis, and materials chemistry. Its growing popularity stems from its ability to provide fast and efficient chemical transformations with a reduced environmental footprint as well as enabling products not accessible in solution. However, despite...

Substituting toxic lead with tin (Sn) in perovskite solar cells (PSCs) is the most promising route towards the development of high‐efficiency lead‐free devices. Despite the encouraging efficiencies of Sn‐PSCs, they are still yet to surpass 15% and suffer detrimental oxidation of Sn(II) to Sn(IV). Since their first application in 2014, many investig...