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Spectroscopic investigations of delaminated and intercalated phyllosilicates

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Book Series: Karlsruher Mineralogische und Geochemische Hefte ISSN: 16182677 ISBN: 3937300589 Year: Volume: 27 Pages: VIII, 150 p. DOI: 10.5445/KSP/1000003440 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: General and Civil Engineering
Added to DOAB on : 2019-07-30 20:01:58

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The characteristic feature of phyllosilicates like muscovite (KAl2[Si3AlO10(OH)2] is their layered structure. Due to the resulting anisotropic optical and electrical properties this mineral is an important raw material in paint industries and polymer composites.Crucial for many of these properties is on one hand a high aspect ratio of the stacks, which will be enhanced by delamination of the mineral. On the other hand the exchange of the interlayer cations like potassium changes the chemical properties of the muscovite, its refraction behaviour and surface properties. But these interlayer cations are difficult to access and are not exchangeable under normal conditions.Thus a process for the intercalation of cations like Cu2+, Mg2+ or Zn2+ from super saturated nitrate solutions in autoclaves was developed to reveal a chemically modified mica phase.The extensive modification of the muscovite structure, due to the intercalation is monitored by X-ray diffractometry and several spectroscopic methods. The XRD results strongly suggest the formation of an intercalated irregular mixed-layer phase. This is proven by far infrared spectroscopy which show the simultaneous occurrence of both K+ and Cu2+ in the interlayer region, strongly increasing the interlayer space.1Investigations in the mid infrared region using diffuse reflectance spectroscopy (DRIFT) suggest a further migration of the intercalated cations deep into the ditrigonal holes of the tetrahedral sheet and their fixation within these holes close to the OH groups.

Structure and Mechanical Properties of Transition Group Metals, Alloys, and Intermetallic Compounds

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ISBN: 9783039211463 / 9783039211470 Year: Pages: 222 DOI: 10.3390/books978-3-03921-147-0 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering --- Materials
Added to DOAB on : 2019-08-28 11:21:27
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The aim of this Special Issue is to present the latest theoretical and experimental achievements concerning the mechanisms of microstructural change in metallic materials subject to different processing methods, and their effect on mechanical properties. It is my pleasure to present a series of compelling scientific papers written by scientists from the community of transition group metals, alloys, and intermetallic compounds.

Keywords

metal matrix composites --- laser metal deposition --- Inconel 625 --- additive manufacturing --- laser processing --- metal matrix composites --- Z-pin reinforcement --- delamination --- carbon fiber --- strengthening mechanisms --- severe plastic deformation (SPD) --- cross-channel extrusion (CCE) --- back pressure (BP) --- numerical simulation (FEM) --- physical modeling technique (PMT) --- metal–matrix composites (MMCs) --- carbon fiber --- mechanical properties --- z-pin reinforcement --- laminate --- titanium alloys --- high pressure torsion --- microhardness --- Cu–Ag alloy --- high-pressure torsion --- ultrafine microstructure --- phase dissolution --- microhardness --- friction stir welding --- heat treatment --- AA2519 --- microstructure --- fatigue --- fractography --- AZ91 --- magnesium alloys --- creep --- high pressure die casting --- additive manufacturing --- Ti-6Al-4V --- LENS --- mechanical characterization --- twin roll casting --- magnesium alloy --- calcium --- Mg-Zn-Al-Ca alloy --- texture --- flow curve --- processing map --- honeycomb structure --- additive manufacturing --- laser engineered net shaping --- LENS --- Ti6Al4V alloy --- energy absorption --- dynamic tests --- solidification thermal parameters --- Cu-Al-Ni-Fe bronze alloys --- hardness --- microhardness --- specific intermetallics --- MAX phase --- Ti3SiC2 --- composite --- high energy ball milling --- spark plasma sintering --- structure --- mechanical properties --- deformation behavior --- tribaloy-type alloy --- CoCrMoSi alloy coatings --- T-800 alloy --- Laves phase --- Laser Engineered Net Shaping (LENSTM) --- electron microscopy (in situ SEM) --- delamination --- metal matrix composites (MMCs) --- z-pinning

Graphene and Other 2D Layered Nanomaterial-Based Films: Synthesis, Properties and Applications

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ISBN: 9783039219025 / 9783039219032 Year: Pages: 138 DOI: 10.3390/books978-3-03921-903-2 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Chemistry (General) --- Organic Chemistry
Added to DOAB on : 2020-01-07 09:08:26
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This book is dedicated to highlighting some relevant advances in the field of thin films and coatings based on two-dimensional crystals and layered nanomaterials. Due to their layered structure, graphene and a variety of new 2D inorganic nanosystems, called “graphene analogues”, have all attracted tremendous interest due to their unprecedented properties/superior performance, and may find applications in many fields from electronics to biotechnology. These two-dimensional systems are ultrathin and, hence, tend to be flexible, also presenting distinctive and nearly intrinsic characteristics, including electronic, magnetic, optical, thermal conductivity, and superconducting properties. Furthermore, the combination of different structures and synergetic effects may open new and unprecedented perspectives, making these ideal advanced materials for multifunctional assembled systems. As far as the field of coatings is concerned, new layered nanostructures may offer unique and multifunctional properties, including gas barrier, lubricant, conductive, magnetic, photoactive, self-cleaning, and/or antimicrobial surfaces. This book contains new findings on the synthesis and perspectives of multifunctional films that are at the forefront of the science and coating technologies.

Advancements in Gel Science—A Special Issue in Memory of Toyoichi Tanaka

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ISBN: 9783039213436 / 9783039213443 Year: Pages: 178 DOI: 10.3390/books978-3-03921-344-3 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- Chemical Technology
Added to DOAB on : 2019-12-09 11:49:15
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A gel is a state of matter that consists of a three-dimensional cross-linked polymer network and a large amount of solvent. Because of their structural characteristics, gels play important roles in science and technology. The science of gels has attracted much attention since the discovery of the volume phase transition by Professor Toyoichi Tanala at MIT in 1978. MDPI planned to publish a Special Issue in Gels to celebrate the 40th anniversary of this discovery, which received submissions of 13 original papers and one review from various areas of science. We believe that readers will find this Special Issue informative as to the recent advancements of gel research and the broad background of gel science.

Keywords

gel --- thermoresponsive property --- monomer sequence --- co-crosslinking --- copolymerization --- acrylamide derivative --- swelling --- volume phase transition --- agarose gel --- compression --- solvent transport --- sucrose --- xylitol --- volume phase transition --- effects of electric charge --- swelling of thermosensitive gels --- sol-gel transition --- site-bond correlated-percolation model for polymer gelation --- gelation temperature --- cloud point temperature --- spinodal temperature --- spinodal decomposition --- janus particle --- anisotropic shape --- phase separation --- wetting --- micrometric confinement --- micropipette aspiration --- PVA gel --- gamma ray sterilization --- artificial hydrogel cartilage --- frictional property --- wear --- xerogel --- Brunauer-Emmett-Teller theory --- Barrett-Joyner-Halenda analysis --- temperature --- solids content --- drying --- solvent exchange --- microgel --- electrophoresis --- light scattering --- paint coating --- wrinkle --- swelling --- buckling --- Sephadex® (crosslinked dextran) --- crosslink density (density of crosslinks) --- ice grain --- ice crystallization during rewarming --- glassy water --- X-ray CT --- XRD --- poly(vinyl alcohol) --- chemical gel --- microcrystallite --- hydrogen bond --- swelling behavior --- hysteresis --- hydrogel --- friction --- fatigue --- wear --- fracture --- crack --- adhesion --- delamination --- poly (acryl amide) gel --- time domain reflectometry (TDR) of dielectric spectroscopy --- pulse field gradient spin echo method of nuclear magnetic resonance (PFG-NMR) --- scaling analysis --- fractal analysis --- heterogeneous gelation dynamics --- moving boundary picture --- phase transition dynamics --- kinetic coefficient --- blood coagulation --- n/a

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