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Graphene-Polymer Composites

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ISBN: 9783038970415 9783038970422 Year: Pages: 232 DOI: 10.3390/books978-3-03897-042-2 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: General and Civil Engineering --- Materials
Added to DOAB on : 2018-09-13 11:10:39
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Presenting very high surface-to-volume ratio, relatively simple processability and low cost, graphene and graphene-related materials were soon identified as promising nanofillers for polymer matrixes. Reports have shown notorious property enhancements for graphene-polymer composites (GPC) at very low filler loadings. Uses of GPC in varied fields, such as energy, electronics, catalysis, separation and purification, biomedicine, aerospace, tribology, etc., have been demonstrated and, in some cases, put into industrial practice. However, challenges still exist. Platelet agglomeration within the polymer matrix is often seen to hinder performance improvements. Poor interfacial adhesion between filler and matrix is also a limiting factor in many systems, demanding for tuning the surface chemistry to promote physical or chemical interactions with the polymer chains. The range of routes for fabrication of graphene-related materials, leading to different morphologies, oxidation states, and degrees of platelet exfoliation, have an impact on the final properties of the composites that has not yet been fully addressed. Some argue that the potential of graphene, and its advantages in relation to other nanofillers, has not yet been clearly demonstrated for polymer composites. This Special Issue provides a state of the art view on the different facets of graphene-polymer composite materials, showing that this area of research is thriving and relevant advancements are still to be expected.

Nano- and Microcomposites for Electrical Engineering Applications

ISBN: 9783038422921 9783038422938 Year: Pages: XVI, 286 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Chemistry (General)
Added to DOAB on : 2016-12-05 09:48:54
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In a dedicated Special Issue, the journal Polymers has compiled papers on the current trends and research directions within the preparation, characterization and application of polymer-based composite materials in electrical engineering applications. In recent times, this type of material has evolved to become one of the most thoroughly investigated materials, stimulated by the demand for the resource-efficient assembly of generators, transformers, communication devices, etc. Novel composites are to be used as insulating materials with high thermal conductivity and excellent temperature stability, through which premature ageing and degradation of devices shall be avoided or at least reduced. This Special Issue comprises twelve contributions by internationally renowned researchers; to mention Petru V. Nothinger (University Politehnica of Bucharest), Alun S. Vaughan (University of Southampton), Stanislaw M. Gubanski (Chalmers University of Technology), Michael Muhr (Graz University of Technology), Johan J. Smit (TU Delft), and Ulf W. Gedde (KTH Royal Institute of Technology) as prominent examples. The state-of-the-art research and technology of the area ‘micro- and nanocomposites for electrical engineering applications’ has been summarized in three review articles, while the current research trends and the development and characterization of novel materials have been described in eight original research articles. Stimulated by the vivid current interest in this topic, this Special Issue of Polymers has additionally been compiled in a book version.

Solid Catalysts for the Upgrading of Renewable Sources

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ISBN: 9783038975724 Year: Pages: 226 DOI: 10.3390/books978-3-03897-573-1 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Chemistry (General) --- Science (General)
Added to DOAB on : 2019-04-05 11:07:22
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The use of solid catalysts for the upgrade of renewable sources gives the opportunity to combine the two main cores of green chemistry, that is, on the one hand, the set-up of sustainable processes and, on the other, the use of biomass-derived materials. Solid catalysts have taken on a leading role in traditional petrochemical processes and could represent a key tool in new biorefinery-driven technologies.

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: eng
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

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