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Compounds with Polar Metallic Bonding

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ISBN: 9783039210701 9783039210718 Year: Pages: 154 DOI: 10.3390/books978-3-03921-071-8 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Chemistry (General) --- Inorganic Chemistry
Added to DOAB on : 2019-08-28 11:21:27
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The Special Edition 'Compounds with Polar Metallic Bonding' is a collection of eight original research reports presenting a broad variety of chemical systems, analytical methods, preparative pathways and theoretical descriptions of bonding situations, with the common aim of understanding the complex interplay of conduction electrons in intermetallic compounds that possess different types of dipoles. Coulombic dipoles introduced by electronegativity differences, electric or magnetic dipoles, polarity induced by symmetry reduction—all the possible facets of the term 'polarity'—can be observed in polar intermetallic phases and have their own and, in most cases, unique consequences on the physical and chemical behaviour. Elucidation of the structure–property relationships in compounds with polar metallic bonding is a modern and growing scientific field which combines solid state physics, preparative chemistry, metallurgy, modern analytic methods, crystallography, theoretical calculations of the electronic state and many more disciplines.

Advanced Synchrotron Radiation Techniques for Nanostructured Materials

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ISBN: 9783039216802 9783039216819 Year: Pages: 138 DOI: 10.3390/books978-3-03921-681-9 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Mathematics --- Science (General)
Added to DOAB on : 2019-12-09 11:49:16
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Nanostructured materials exploit physical phenomena and mechanisms that cannot be derived by simply scaling down the associated bulk structures and phenomena; furthermore, new quantum effects come into play in nanosystems. The exploitation of these emerging nanoscale interactions prompts the innovative design of nanomaterials. Understanding the behavior of materials on all length scales—from the nanostructure up to the macroscopic response—is a critical challenge for materials science. Modern analytical technologies based on synchrotron radiation (SR) allow for the non-destructive investigation of the chemical, electronic, and magnetic structure of materials in any environment. SR facilities have developed revolutionary new ideas and experimental setups for characterizing nanomaterials, involving spectroscopy, diffraction, scatterings, microscopy, tomography, and all kinds of highly sophisticated combinations of such investigation techniques. This book is a collection of contributions addressing several aspects of synchrotron radiation as applied to the investigation of chemical, electronic, and magnetic structure of nanostructured materials. The results reported here provide not only an interesting and multidisciplinary overview of the chemicophysical investigations of nanostructured materials carried out by state-of-the-art SR-induced techniques, but also an exciting glance into the future perspectives of nanomaterial characterization methods.

Electrochemical Surface Science: Basics and Applications

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ISBN: 9783039216420 9783039216437 Year: Pages: 398 DOI: 10.3390/books978-3-03921-643-7 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Chemistry (General) --- Inorganic Chemistry
Added to DOAB on : 2019-12-09 11:49:15
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Electrochemical surface science (EC-SS) is the natural advancement of traditional surface science (where gas–vacuum/solid interfaces are studied) to liquid (solution)/electrified solid interfaces. Such a merging between two different disciplines—i.e., surface science (SS) and electrochemistry—officially advanced ca. three decades ago. The main characteristic of EC-SS versus electrochemistry is the reductionist approach undertaken, inherited from SS and aiming to understand the microscopic processes occurring at electrodes on the atomic level. A few of the exemplary keystone tools of EC-SS include EC-scanning probe microscopies, operando and in situ spectroscopies and electron microscopies, and differential EC mass spectrometry (DEMS). EC-SS indirectly (and often unconsciously) receives a great boost from the requirement for rational design of energy conversion and storage devices for the next generation of energetic landscapes. As a matter of fact, the number of material science groups deeply involved in such a challenging field has tremendously expanded and, within such a panorama, EC and SS investigations are intimately combined in a huge number of papers. The aim of this Special Issue is to offer an open access forum where researchers in the field of electrochemistry, surface science, and materials science could outline the great advances that can be reached by exploiting EC-SS approaches. Papers addressing both the basic science and more applied issues in the field of EC-SS and energy conversion and storage materials have been published in this Special Issue.

Keywords

electrosynthesis --- switchable surfaces --- alkoxyamine surfaces --- redox monolayers --- porphyrins --- self-assembly --- surface nanostructures --- in situ EC-STM --- metal-electrolyte interface --- potential-dependent structures --- combined non-covalent control --- ECALE --- CdS --- silver single crystals --- alkanthiols --- SAMs --- EQCM --- AES --- polypyrrole --- diazonium salts --- flexible ITO --- adhesion --- redox properties --- X-ray absorption spectroscopy --- energy dispersive --- quick-XAS --- FEXRAV --- free electron laser --- electrochemistry --- photoelectrochemistry --- photochemistry --- pump &amp --- probe --- oxygen evolution reaction --- water splitting --- iridium --- thin-films --- spin-coating --- model systems --- electrocatalysts --- oxygen evolution reaction --- iridium --- nickel --- electrodeposition --- model catalyst --- water oxidation --- CO oxidation --- DFT --- hydrogen adsorption --- Pt–Ru catalysts --- ordered mesoporous carbons --- graphitization --- CO oxidation --- methanol oxidation --- direct methanol fuel cells --- electrocatalysis --- catalysts --- methanol oxidation reaction --- graphene --- DMFC --- Pt --- SOFC --- cathode --- XAFS --- in situ --- cobalt oxide --- water oxidation --- photo-electrochemistry --- hydroxyl radical --- electro-oxidation --- Lead OPD --- surface alloy --- XPS --- UPS --- EF-PEEM --- ORR --- Platinum --- PVDF --- PEMFC --- in situ ambient pressure XPS --- hard X rays --- photoelectron simulations --- solid/liquid interface --- TiO2 --- APTES --- Cu(111) --- electrochemical interface --- in-situ X-ray diffraction --- carbon nanofiber --- porous fiber --- electrospinning --- mesopore --- micropore --- porogen --- ammonia activation --- surface area --- methanol oxidation --- platinum single crystals --- pH and concentration effects --- adsorbed OH --- reduced graphene oxide --- electrophoretic deposition --- surface chemistry --- click chemistry --- gold --- palladium --- bimetallic alloy --- carbon nanofibers (CNFs) --- cyclic voltammetry (CV) --- Surface Modification --- Blackening of Steel --- Magnetite --- Corrosion Protection --- Auger-Electron Spectroscopy --- Ordered mesoporous carbon --- nitrogen doping --- cobalt-based electrocatalyst --- bifunctional oxygen electrode --- solvothermal method --- underpotential deposition (upd) --- Au --- Pt --- Pd --- nanoparticles --- cyclic voltammetry --- electrocatalysis --- operando --- near ambient pressure XPS --- scanning photoelectron microscopy --- solid oxide fuel cells --- surface science --- electrodeposited alloys --- CO electro-oxidation --- Pt single-crystal electrodes --- potential cycling --- potential stepping --- surface reconstruction --- electrocatalysis --- oxygen reduction --- ORR --- gas diffusion electrode --- platinum --- fuel cells --- thin-films --- benchmarking --- mass transport --- formic acid oxidation --- Au nanocrystals --- Pd thin films --- electrocatalysis --- d-band theory --- polymer --- silicon nanoparticles --- EPR spectroscopy --- photoconversion --- n/a

Mineral Surface Reactions at the Nanoscale

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ISBN: 9783038978961 9783038978978 Year: Pages: 220 DOI: 10.3390/books978-3-03897-897-8 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Geology --- Earth Sciences
Added to DOAB on : 2019-06-26 08:44:06
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Reactions at mineral surfaces are central to all geochemical processes. As minerals comprise the rocks of the Earth, the processes occurring at the mineral–aqueous fluid interface control the evolution of the rocks and hence the structure of the crust of the Earth during processes such as metamorphism, metasomatism, and weathering. In recent years focus has been concentrated on mineral surface reactions made possible through the development of advanced analytical methods such as atomic force microscopy (AFM), advanced electron microscopies (SEM and TEM), phase shift interferometry, confocal Raman spectroscopy, and advanced synchrotron-based applications, to enable mineral surfaces to be imaged and analyzed at the nanoscale. Experiments are increasingly complemented by molecular simulations to confirm or predict the results of these studies. This has enabled new and exciting possibilities to elucidate the mechanisms that govern mineral–fluid reactions. In this Special Issue, “Mineral Surface Reactions at the Nanoscale”, we present 12 contributions that highlight the role and importance of mineral surfaces in varying fields of research.

Catalysis by Precious Metals, Past and Future

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ISBN: 9783039287222 / 9783039287239 Year: Pages: 204 DOI: 10.3390/books978-3-03928-723-9 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Chemistry (General) --- Inorganic Chemistry
Added to DOAB on : 2020-06-09 16:38:57
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The future of the precious metals is shiny and resistant. Although expensive and potentially replaceable by transition metal catalysts, precious metal implementation in research and industry shows potential. These metals catalyze oxidation and hydrogenation due to their dissociative behavior toward hydrogen and oxygen, dehydrogenation, isomerization, and aromatization, etc. The precious metal catalysts, especially platinum-based catalysts, are involved in a variety of industrial processes. Examples include Pt–Rh gauze for nitric acid production, the Pt/Al2O3 catalyst for cyclohexane and propylene production, and Pd/Al2O3 catalysts for petrochemical hydropurification reactions, etc. A quick search of the number of published articles in the last five years containing a combination of corresponding “metals” (Pt, Pd, Ru, Rh and Au) and “catalysts” as keywords indicates the importance of the Pt catalysts, but also the continuous increase in the contribution of Pd and Au. This Special Issue reveals the importance of precious metals in catalysis and focuses on mono- and bi-metallic formulations of any supported precious metals and their promotional catalytic effect of other transition metals. The application of precious metals in diverse reactions, either homogeneous or heterogeneous, and studies of the preparation, characterization, and applications of the supported precious metal catalysts, are presented.

Surface Modification to Improve Properties of Materials

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ISBN: 9783038977964 9783038977971 Year: Pages: 356 DOI: 10.3390/books978-3-03897-797-1 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2019-04-25 16:37:17
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This book contains selected contributions on surface modification to improve the properties of solid materials. The surface properties are tailored either by functionalization, etching, or deposition of a thin coating. Functionalization is achieved by a brief treatment with non-equilibrium gaseous plasma containing suitable radicals that interact chemically with the material surface and thus enable the formation of rather stable functional groups. Etching is performed in order to modify the surface morphology. The etching parameters are selected in such a way that a rich morphology of the surfaces is achieved spontaneously on the sub-micrometer scale, without using masks. The combination of adequate surface morphology and functionalization of materials leads to superior surface properties which are particularly beneficial for the desired response upon incubation with biological matter. Alternatively, the materials are coated with a suitable thin film that is useful in various applications from food to aerospace industries.

Keywords

sulphur hexafluoride (SF6) plasma --- tetrafluoromethane (CF4) plasma --- polymer polyethylene terephthalate (PET) --- surface modification --- functionalization and wettability --- optical emission spectroscopy (OES) --- electronegativity --- PVD nanocomposite coatings --- aluminum die casting --- tool life --- tribological performance --- plasma surface modification --- polymer polypropylene --- neutral oxygen atom density --- initial surface functionalization --- food packaging --- wettability --- tantalum --- hardness --- gradient nanostructured layer --- grain size --- residual stress --- dry wear behavior --- surface texture --- surface treatment --- Ti6Al4V alloy --- tribology --- biology --- materials characterization --- shot-peening --- image processing --- TIG welding --- aluminum 6061-T6 --- special surfaces --- wettability --- superhydrophobic --- cell cultures --- anti-bio adhesion --- self-cleaning fabrics --- polyethylene granules --- low-pressure MW air plasma --- optical emission spectroscopy --- XPS --- laser cobalt catalytic probe --- Alloy 718 --- surface hardness --- surface residual stress --- grain size --- fretting failure --- corrosion --- antimicrobial film --- nisin --- physical properties --- plasma treatment polyvinyl alcohol --- surface characterization --- microhole-textured tool --- CaF2 --- micro-EDM --- tribological properties --- egg shell --- stearic acid --- modification --- particle characterization --- epoxy composites --- dynamic mechanical analysis --- adhesion effectiveness --- Poly(tetrafluoroethylene) --- Teflon --- plasma treatment --- zeta potential --- surface energy --- contact angle measurement --- lectin --- bovine serum albumin --- adsorption --- cellulose thin film --- polystyrene --- gold --- surface plasmon resonance spectroscopy --- silver nanoparticles --- laser ablation in liquids --- laser synthesis of colloidal nanoparticles solution --- nanoparticle-impregnated paper --- antimicrobial activity --- fiber fines --- sheet forming --- vacuum filtration --- pulse power --- electrical stimulation --- electric field --- mushroom --- L. edodes --- Lyophyllum deeastes Sing --- surface modification --- porous silicon --- silicon surface --- carbonization --- oxidation --- aluminum --- alloy --- duralumin --- etching --- surface texture --- porous-like --- adhesive bonding --- superhydrophobic --- porous silicon --- visible light assisted organosilanization --- solid state NMR --- XPS --- ToF-SIMS --- atmospheric pressure plasma jets --- plasma polymerization --- superhydrophobicity --- wetting --- biomaterial --- polymer --- plasma --- functionalization --- surface properties --- thrombosis --- hemocompatibility --- endothealization --- vascular graft --- biocompatibility --- endothelial cells --- surface properties --- nanostructuring --- functionalization --- grafting

Mineralogy of Noble Metals and “Invisible” Speciations of These Elements in Natural Systems

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ISBN: 9783039286348 / 9783039286355 Year: Pages: 224 DOI: 10.3390/books978-3-03928-635-5 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Geology --- Earth Sciences
Added to DOAB on : 2020-06-09 16:38:57
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This Special Issue covers a broad range of topics related to the mineralogy of noble metals (Au, Ag, Pt, Pd, Rh, and Ru) and the occurrence, formation, and distribution of these elements in natural ore-forming systems. This collection of eleven research articles discusses various problems related to these topics. I hope this Special Issue will contribute to a better understanding of the genesis of gold, silver, and other noble metal deposits as well as the behavior of these elements in endogenic and supergene environments, and suggest ways forward to solving the problem of their full extraction from ores.

Keywords

gold selenide --- gold sulfoselenide --- colloids --- nanoparticles --- nucleation --- liquid intermediates --- deposition --- XPS --- sulfide minerals --- platinum --- deposition --- valleriite --- chloride complexes --- zircon U–Pb age --- in situ sulfur isotopes --- gold source --- ore genesis --- Chaoyangzhai gold deposit --- Southeast Guizhou --- mineralization age --- Nibao gold deposit --- ore-forming fluid --- Rb–Sr isotopic composition --- Yunnan–Guizhou–Guangxi “Golden Triangle” region --- Gaching ore deposit --- mustard gold --- calaverite --- maletoyvayamite --- Fe-Sb(Te,As,Se,S)-oxides --- Au-Sb(Te,Se,S,As)-oxides --- Cu-Fe-Ni-S system --- platinum-group elements --- Au --- Ag --- metalloid elements --- fractional crystallization --- drop-shaped inclusions --- noble metals --- invisible species --- distribution --- pyrite --- arsenopyrite --- structural and surficial modes --- arsenopyrite --- crystal lattice --- ligand surroundings --- non-equal positions --- Mössbauer Effect --- gold --- “invisible” gold --- gold ore deposits --- Kagan ultramafic massif --- Southern Urals --- antigorite serpentinites --- magnetite veins --- gold mineralization --- native gold --- thermodynamic modeling --- fluid regime --- Fennoscandian Shield --- Kolmozero–Voronya belt --- Oleninskoe deposit --- mustard gold --- dyscrasite --- chlorargyrite --- gold ore field --- karst cavities --- monolithic and porous gold --- Tl oxides (avicennite) --- Tl carbonates --- Tl tellurates and antimonates --- n/a

Design and Development of Nanostructured Thin Films

Authors: --- ---
ISBN: 9783039287383 / 9783039287390 Year: Pages: 386 DOI: 10.3390/books978-3-03928-739-0 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General)
Added to DOAB on : 2020-06-09 16:38:57
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Due to their unique size-dependent physicochemical properties, nanostructured thin films are used in a wide range of applications from smart coating and drug delivery to electrocatalysis and highly-sensitive sensors. Depending on the targeted application and the deposition technique, these materials have been designed and developed by tuning their atomic-molecular 2D- and/or 3D-aggregation, thickness, crystallinity, and porosity, having effects on their optical, mechanical, catalytic, and conductive properties. Several open questions remain about the impact of nanomaterial production and use on environment and health. Many efforts are currently being made not only to prevent nanotechnologies and nanomaterials from contributing to environmental pollution but also to design nanomaterials to support, control, and protect the environment. This Special Issue aims to cover the recent advances in designing nanostructured films focusing on environmental issues related to their fabrication processes (e.g., low power and low cost technologies, the use of environmentally friendly solvents), their precursors (e.g., waste-recycled, bio-based, biodegradable, and natural materials), their applications (e.g., controlled release of chemicals, mimicking of natural processes, and clean energy conversion and storage), and their use in monitoring environment pollution (e.g., sensors optically- or electrically-sensitive to pollutants)

Keywords

InAlN --- nanospiral --- metamaterial --- sputtering --- chirality --- microparticle deposition --- self-assembly --- homogeneity --- monomer synthesis --- mask --- hazardous organic solvents --- photonic nanostructures --- self-assembly --- polymer nanoparticles --- biomimetic solvent sensors --- iridescence --- mesoporous --- Al2O3 --- MgO --- poly(dimethylacrylamide) --- hydrogel --- thin film --- spin coating --- SEM --- FIB --- Kr physisorption --- hydrogenated amorphous carbon films --- metallic nanoparticles --- hybrid deposition system --- nanoscratch --- nanocomposites --- aqueous dispersion --- carbon nanotube --- graphene oxide --- ink --- rod coating --- electrical conductivity --- optical transmittance --- mechanical flexibility --- silk sericin --- agarose --- lysozyme --- composite gel --- wound dressing --- nanofiber --- lamination --- water filtration --- CdTe --- self-catalysed --- wires --- Mg alloy --- LDH --- corrosion --- deposition --- coating --- ReB2/TaN multilayers --- modulation structure --- first-principles calculation --- interfacial model --- adsorption energy --- interfacial energy --- biomaterial --- biomedical --- nanofibers --- scaffolds --- reinforced --- hybrid material --- thermal analysis --- nanofibrous membranes --- light trapping --- silicon thin film --- photovoltaics --- polystyrene sphere assisted lithography --- nanostructured back reflectors --- Raman scattering --- quantum confinement --- electron–phonon coupling --- polar semiconductors --- zinc oxide --- metal-organic framework --- microscopy --- thin films --- powders --- electrodeposition --- platinum --- highly oriented pyrolytic graphite --- 2D growth --- barrier material --- nanocoating of SiOx --- polymeric matrix --- plasma deposition --- PVD --- PA-PVD --- PECVD --- permeation --- CERAMIS® --- SorpTest --- iron oxides --- FeO --- Fe3O4 --- ultrathin films --- epitaxial growth --- platinum --- ruthenium --- symmetry --- LEEM --- LEED --- XPEEM --- electrodeposition --- platinum --- highly oriented pyrolytic graphite --- 2D growth --- thin films --- TiO2NPs --- AuNPs --- photocatalysis --- mercury vapors adsorbing layer --- PAS device --- iron oxides --- ultrathin films --- silver --- epitaxial growth --- structural characterization --- STM --- LEED --- XPS --- DFT --- model system --- Pt thin deposits --- galvanic displacement --- UPD --- SLRR --- electrocatalysis --- nanostructured films --- birefringence --- nanocrystalline cellulose --- Mueller matrix --- vanadium dioxide --- post-treatment --- plasma irradiation --- luminous transmittance --- phase transition performance --- electrospinning deposition --- chemosensor --- nanocomposite conductive polymers --- polyhydroxibutyrate --- polystyrene --- H2TPP --- VOCs selectivity --- mesoporous graphene --- thin film --- nanostructure --- CaxCoO2 --- sputtering --- phase transformation --- Ge surface engineering --- La2O3 passivation layer --- atomic layer deposition --- electrical properties

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