Advances In Metal Research Articles

Recent Advances in Metal−Organic Frameworks for Applications in Magnetic Resonance Imaging

Recent Advances in Metal−Organic Frameworks for Applications in Magnetic Resonance Imaging

Editorial: Advances in metals and trace elements isotopes measurements, experiments and application in environmental sciences

Editorial: Advances in metals and trace elements isotopes measurements, experiments and application in environmental sciences

Recent advances in metal–organic framework-based materials for removal of fluoride in water: Performance, mechanism, and potential practical application

Clean water is necessary in all areas of life, especially for our body. Fluoride in water has serious negative effects on human health and the environment. Effectively repairing fluoride-polluted water remains a critical mission. Among the numerous technologies for removing fluoride from water, metal–organic framework (MOF) materials are regarded as promising adsorption materials. In this study, the synthesis of MOFs and their application progress in aquatic defluoridation in recent years, which are classified according to the central metal ions, are reviewed. In particular, an understanding of the effect factors for water remediation is provided, and the potential environmental application is analyzed. The adsorption mechanism and the evaluation on potential practical applications for fluoride removal by different MOFs are elucidated. Finally, future research opportunities and prospects of MOF-based materials for fluoride removal are proposed.

Recent Advances in Metal, Ceramic, and Metal–Ceramic Composite Films/Coatings

Coating materials and technologies are becoming increasingly important in many research areas because they can provide an efficient and affordable way to engineer materials with desirable properties for a broad range of applications [...]

Recent Advances in Metal Catalyzed C−H Functionalization with a Wide Range of Directing Groups

AbstractC−H bond functionalization is an emerging field with various pharmaceuticals, agrochemicals and dye chemistry applications. We have explored the use of C−H bond functionalization with catalytic metals and various remote/directing groups such as pyridine, pyrimidine, 8‐aminoquinoline or n‐quinoline, 2‐isopropylpyridine, oxazoline,2‐aminopyridine‐1‐oxide, N‐(2‐(methylthio)phenyl), 2‐methoxyiminoacetyl, 2‐amino‐3‐fluoro‐N,N‐dimethylbenzamide, 2‐dimethylaminoethylamine, N‐(2‐aminophenyl)‐acetamide, 5‐methylisoxazole‐3‐carboxamide, oligopeptide, β‐carboline amide, N‐tosylethylenediamine, acetohydrazide, β‐alanine, 3‐amino‐2‐benzylpropanoic acid and 2‐(methylsulfinyl)aniline with metacycles sides. Moreover, these metals employed (Pd, Rh, Ru, Mn, Ni, Fe, Cu or Co) in these reactions have relevant good catalytic properties and can catalyze a wide range of chemical reactions such as cyanations, arylations, alkenylations, allylations, alkylations and alkynylations with a wide range of removable auxiliary were reviewed. Importantly, functionalization of β‐C(sp3)−H, ortho‐(sp2)−H carbonyl compounds, γ‐C(sp3)−H arylation and γ‐C(sp2)−H of amines, amino esters and alkyl acetal are summarized in this review.

Recent advances in metal-organic frameworks for gas adsorption/separation.

The unique structural advantage of metal–organic frameworks (MOFs) determines the great prospect and developability in gas adsorption and separation. Both ligand design and microporous engineering based on crystal structure are significant lever for coping with new application exploration and requirements. Focusing on the designable pore and modifiable frameworks of MOFs, this review discussed the recent advances in the field of gas adsorption and separation, and analyzed the host–guest interaction, structure–performance relations, and the adsorption/separation mechanism from ligand design, skeleton optimization, metal node regulation, and active sites construction. Based on the function-oriented perspective, we summarized the main research recently, and made an outlook based on the focus of microporous MOFs that require further attention in the structure design and industrial application.

Recent advances in metal-organic frameworks and their composites for the phototherapy of skin wounds.

Wound healing is a complex process that greatly affects the normal physiological activities of genes, proteins, signaling pathways, tissues, and organs. Bacterial infection could easily lead to serious tissue damage during wound healing, thus countering wound infections becomes a major challenge for clinicians and nursing professionals. At present, the exploration of highly effective, low toxicity and environment friendly methods for wound healing is attracting considerable interest all over the world. Recently, metal-organic frameworks (MOFs) have presented great potential for treating wound infections due to their unique characteristics of diversified functionality, large specific surface area, and high biocompatibility. These properties endow MOFs/MOF-based composites with an outstanding anti-wound infection effect, which is mainly attributed to the continuously released active components and the exerted catalytic activity with the assistance of phototherapy. In this review, the current progress of MOFs/MOF-based composites for the phototherapy of skin wounds is presented. Firstly, we illustrate the pathophysiological mechanisms, principles of phototherapy and the conventional methods for wound healing. Then, the structures and characteristics of MOFs are systematically summarized. Moreover, the review highlights the recent advances in the application of phototherapy for wound healing (including photodynamic therapy, photothermal therapy, and synergistic therapy) based on various MOFs/MOF-based composites. Finally, the challenges and perspectives are provided for the further development of MOF-based materials for medical application.

Recent Advances in Metal–Gas Batteries with Carbon‐Based Nonprecious Metal Catalysts

AbstractMetal–gas batteries draw a lot of attention due to their superiorities in high energy density and stable performance. However, the sluggish electrochemical reactions and associated side reactions in metal–gas batteries require suitable catalysts, which possess high catalytic activity and selectivity. Although precious metal catalysts show a higher catalytic activity, high cost of the precious metal catalysts hinders their commercial applications. In contrast, nonprecious metal catalysts complement the weakness of cost, and the gap in activity can be made up by increasing the amount of the nonprecious metal active centers. Herein, recent work on carbon‐based nonprecious metal catalysts for metal–gas batteries is summarized. This review starts with introducing the advantages of carbon‐based nonprecious metal catalysts, followed by a discussion of the synthetic strategy of carbon‐based nonprecious metal catalysts and classification of active sites, and finally a summary of present metal–gas batteries with the carbon‐based nonprecious metal catalysts is presented. The challenges and opportunities for carbon‐based nonprecious metal catalysts in metal–gas batteries are also explored.

Environmental remediation potentialities of metal and metal oxide nanoparticles: Mechanistic biosynthesis, influencing factors, and application standpoint

Nanotechnology has emerged as a promising field in the development and modification of new nanostructured materials for multifaceted applications, including environmental remediation. Nanoparticles based trendy materials as robust adsorbents and efficient catalytic constructs offer unique structural, chemical, and multifunctional properties, such as high mechanical strength, morphologies, and diverse composition, which promise its use in catalysis, adsorption, degradation, and so on. Herein, we report contemporary advances in metal and metal oxide nanoparticles and their strategic role in environmental approaches, mainly due to the great interest and need for scientific community. The concept of green nanoscience is a practical application of advanced nanotechnology and, therefore, following this relationship between nanotechnology and green chemistry, the biosynthesis of nanoparticles has evolved as an excellent approach. In view of the different techniques widely explored for nanoparticles synthesis, it is possible to state that the main methods currently used are expensive, environmentally harmful, and inefficient regarding the use of materials with applications viewpoints. The natural extracts contain several secondary metabolites that assist in the redox process of metal ions in nanoparticles. Special attention is given to synthetic biological procedures and solvent systems when compared to nanoparticles obtained by non-biological methods. Here, we review recent advances in mechanistic approaches to nanoparticle biosynthesis, as well as the parameters influencing production rate, size, morphology, and their environmental implications. It will become evident that the environmental implication is a rapidly growing field. • The mechanism and factors affecting biosynthesis of metal and metal oxide nanoparticles are discussed in detail. • Biomass acts as reducing and stabilizing molecules in biosynthesis. • Physical chemistry techniques to characterize nanoparticles are outlined. • Environmental remediation potentialities of biosynthesized nanoparticles.

Recent Advances in Metal‐ and Organocatalyzed Asymmetric Functionalization of Pyrroles

AbstractThe wide occurrence of pyrroles in natural products and pharmaceuticals calls for novel synthetic methodologies for the efficient synthesis of enantiopure pyrroles. Owing to their highly reactive nature and wide‐ranging chemical landscape, enormous efforts have been dedicated not only to their synthesis but also to the development of reactions using them as a platform and their utilization in the stereocontrolled synthesis of diverse molecules. In sharp contrast to the extensive studies devoted toward indoles, the asymmetric functionalization of pyrroles was less explored. Nevertheless, the attractiveness of pyrroles for their selective functionalization to access natural product analogy, and medicinally useful architectures have witnessed tremendous growth in the last few years. Their effectiveness under both metal‐ and organocatalytic conditions currently encompasses a vast majority of enantioselective transformations. This review article aims to present a comprehensive overview of the catalytic asymmetric C−H as well as N−H functionalization of pyrroles reported from 2010 to now.

Recent Advances in Metal-Organic Frameworks Derived Nanocomposites for Photocatalytic Applications in Energy and Environment.

Solar energy is a key sustainable energy resource, and materials with optimal properties are essential for efficient solar energy‐driven applications in photocatalysis. Metal–organic frameworks (MOFs) are excellent platforms to generate different nanocomposites comprising metals, oxides, chalcogenides, phosphides, or carbides embedded in porous carbon matrix. These MOF derived nanocomposites offer symbiosis of properties like high crystallinities, inherited morphologies, controllable dimensions, and tunable textural properties. Particularly, adjustable energy band positions achieved by in situ tailored self/external doping and controllable surface functionalities make these nanocomposites promising photocatalysts. Despite some progress in this field, fundamental questions remain to be addressed to further understand the relationship between the structures, properties, and photocatalytic performance of nanocomposites. In this review, different synthesis approaches including self‐template and external‐template methods to produce MOF derived nanocomposites with various dimensions (0D, 1D, 2D, or 3D), morphologies, chemical compositions, energy bandgaps, and surface functionalities are comprehensively summarized and analyzed. The state‐of‐the‐art progress in the applications of MOF derived nanocomposites in photocatalytic water splitting for H2 generation, photodegradation of organic pollutants, and photocatalytic CO2 reduction are systemically reviewed. The relationships between the nanocomposite properties and their photocatalytic performance are highlighted, and the perspectives of MOF derived nanocomposites for photocatalytic applications are also discussed.

Advances in metal–organic frameworks and their derivatives for diverse electrocatalytic applications

Oxygen evolution reaction (OER), hydrogen evolution reaction (HER), oxygen reduction reaction (ORR), nitrogen reduction reaction (NRR), and carbon dioxide reduction reaction (CO2RR) are five major reactions in the progress, conversion, and storage of clean energy.Efficient electrocatalysts can be used to decrease the overpotential of these reactions and elevate practical applications of energy-related systems.Metal–organic frameworks (MOFs), via the modification of electrodes, provide new opportunities to develop green and sustainable energy systems and conduct fundamental research on electrocatalytic applications. Benefitting from the versatility of engineering and construction strategies, compositional/structural modification, high electrical conductivity, various high-density active sites, and the capability as precursors, MOFs and the derived materials are considered as efficient electrocatalysts. Based on those merits, the electrochemical application of MOFs and their derived materials for the five mentioned reactions are briefly discussed in this mini review. Furthermore, the challenges and perspectives for engineering MOF-based electrocatalysts are also provided.

Recent advances in metal nanoparticle‐based floating gate memory

AbstractNonvolatile memory is distinguished for the application in many electronic products due to its excellent charge storage ability. Nevertheless, as the device dimensions are scaled down, floating gate memory encounters various challenges: the increasing leakage current leading to a serious reliability issue and the decreasing of charge density. Hence, metal nanoparticle‐based floating gate memory has been proposed and become a promising candidate for nonvolatile memories due to its outstanding operation speed, excellent scalability, and favorable reliability. This review briefly introduces the classification of memory devices. The operation mechanisms, fabrication and characterization of metal nanoparticle‐based floating gate memory are discussed based on research activities reported in recent years.

A novel nacre-like metal/metal structure by lithography and electrodeposition

Taking a leaf out of Nature’s book, the use of nacre-like structure in the materials synthesis has generated notable successes in creating novel structural composites but has yielded few practical advances in metals. Here we have successfully architected the intricate hierarchical microstructure, the brick-and-mortar structure, in metal/metal hybrids simply by deploying the coupling of lithographic method and electrodeposition technique, which allows the accurate control over the size, volume fraction and shape of the brick, amorphous Ni-P alloy or nanocrystalline Ni, and the formation of a fully interconnected mortar phase, ultrafine-grained Ni or Cu. Tensile testing results show that these innovative composites exhibit an enhanced crack-initiation fracture toughness, and their fracture behaviors have a strong dependency on the initial notch/crack orientation. Our work removes restrictions on the design and synthesis of the real nacre-like metal/metal structure, and provides a promising strategy for developing advanced metals by taking advantages of complex 3 demension brick-and-mortar structure and intricate interface architectures.

Advances in deep eutectic solvents and water: applications in metal- and biocatalyzed processes, in the synthesis of APIs, and other biologically active compounds.

Owing to a growing awareness towards environmental impact, the search for "greener", safer, and cost-effective solvents able to replace petroleum-derived solvents has never been greater today. In this context, the use of environmentally responsible solvents like water and the so-called deep eutectic solvents (DESs), constructed from bio-based compounds, has recently experienced important growth in several fields of sciences. This short review highlights the key features of the chemistry of water and (hydrated) DESs when applied to metal- and biocatalyzed transformations as well as to the synthesis of active pharmaceutical ingredients (APIs) and other biologically relevant compounds by providing, through discussion of all relevant literature over the past five years, a comparison of the outcomes of the reactions when carried out in one or the other solvent.

Metallohelices emulate the properties of short cationic α-helical peptides.

Naturally occurring peptides in many living systems perform antimicrobial and anticancer host defence roles, but their potential for clinical application is limited by low metabolic stability and relatively high costs of goods. Self-assembled helical metal complexes provide an attractive synthetic platform for non-peptidic architectures that can emulate some of the properties of short cationic α-helical peptides, with tuneable charge, shape, size and amphipathicity. Correspondingly there is a growing body of evidence demonstrating that these supramolecular architectures exhibit bioactivity that emulates that of the natural systems. We review that evidence in the context of synthetic advances in the area, driven by the potential for biomedical applications. We note some design considerations for new biologically-relevant metallohelices, and give our outlook on the future of these compounds as therapeutic peptidomimetics.

Recent advances in metal-organic framework-based electrode materials for supercapacitors.

Exploring porous electrode materials with designed micro/nano-structures is an effective way to realize high-performance supercapacitors (SCs). A metal-organic framework (MOF) is a porous crystalline material with a periodic structure formed by coordination of metal ions/clusters and organic ligands. Due to the excellent properties (e.g., large specific surface area, high porosity and tailorable structure), MOFs have been widely used in diverse applications. This Frontier article highlights the recent progress in the synthesis of MOF-based micro/nano-structured electrode materials including pristine MOFs, MOF composites and MOF derivatives, and their application in SCs. Furthermore, the challenges of MOF-based electrode materials and possible solutions are also discussed.

Recent advances in metal–organic framework-based photocatalysts for hydrogen production

This review precisely addresses the recent advances in MOF-based photocatalysts for photocatalytic hydrogen production.

Recent advances in metal-organic frameworks as adsorbent materials for hazardous dye molecules.

Water is vital for the sustenance of all forms of life. Hence, water pollution is a universal crisis for the survival for all forms of life and a hurdle in sustainable development. Textile industry is one of the anthropogenic activities that severely pollutes water bodies. Inefficient dyeing processes result in thousands of tons of synthetic dyes being dumped in water bodies every year. Therefore, the efficient removal of synthetic dyes from wastewater has become a challenging research field. Owing to their tuneable structure-property aspects, metal-organic frameworks (MOFs) have emerged as promising adsorbents for the adsorptive removal of dyes from wastewater and textile effluents. In this perspective, we highlight recent studies involving the application of MOFs for the adsorptive removal of hazardous dye molecules. We also classify the developed MOFs into cationic, anionic, and neutral framework categories to comprehend their suitability for the removal of a given class of dyes.

Recent Advances in Metal Decorated Nanomaterials and Their Various Biological Applications: A Review.

Nanoparticles (nanoparticles) have received much attention in biological application because of their unique physicochemical properties. The metal- and metal oxide–supported nanomaterials have shown significant therapeutic effect in medical science. The mechanisms related to the interaction of nanoparticles with animal and plant cells can be used to establish its significant role and to improve their activity in health and medical applications. Various attempts have been made to discuss the antibiotic resistance and antimicrobial activity of metal-supported nanoparticles. Despite all these developments, there is still a need to investigate their performance to overcome modern challenges. In this regard, the present review examines the role of various types of metal-supported nanomaterials in different areas such as antibacterial, antifungal, anticancer, and so on. Based on the significant ongoing research and applications, it is expected that metal-supported nanomaterials play an outstanding role not only in medical but also in other important areas.