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Photocalytic Coatings for Air-Purifying, Self-Cleaning and Antimicrobial Properties

ISBN: 9783038421382 9783038421375 Year: Pages: 212 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Added to DOAB on : 2016-05-10 11:58:41
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This Special Issue of Coatings is focused on the study of different photocatalyst-basedcoatings for developing self-cleaning, air-purifying and antibacterial properties. In this case, awide variety of photocatalysts (TiO2, Si-TiO2, TiO2−xNy, Ag-TiO2, Mo-TiO2, ZnO, SnO2-Ag,Nb2O5 and C60 fullerene) were evaluated towards the removal of different molecules.Similarly, substrates such as glass, silica, sapphire, polycarbonate, aluminium, stainless steel,concrete and mortar were included in this issue. This information certainly contributes to a betterunderstanding of the photocatalytic removal of different molecules (e.g., Escherichia coli,Staphylococcus aureus, resazuring, rhodamine B, methylene blue, Demeton-S, 2-chloroethylphenyl sulfide (CEPS) and NOx (NO and NO2)) and the coating technologies required forsuch performances. Based on these interesting results, I encourage you to read through thisSpecial Issue and use the valuable information provided therein to help us move forward inthe exciting area of photocatalytic coatings for developing air-purifying, self-cleaning, andantimicrobial properties.

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.

Near Infrared Laser Sensor System for In-Line Detection of Conversion in UV-Cured Polymer Coatings

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ISBN: 9783866448391 Year: Pages: VII, 129 p. DOI: 10.5445/KSP/1000027435 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:59
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The work describes a method for the determination of the conversion by radical photopolymerization of acrylic coatings that is suitable for an in situ monitoring during the coating process.The applied method is based on the 1620 nm overtone absorption of the acrylate end group. The capability of the sensor to discriminate between polymerized and unpolymerized coatings on metal substrates down to a coating thickness of less than 16µm is demonstrated and and proved by reference measurements.

Metallic Glasses

Authors: ---
ISBN: 9783038425076 9783038425069 Year: Pages: 194 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Chemistry (General)
Added to DOAB on : 2018-01-04 14:58:25
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Due to their amorphous character and the concomitant lack of dislocations, metallic glasses exhibit physical and chemical properties that are quite different from those of other solid materials. For example, they can be twice as strong as steels, exhibit superior soft magnetic behavior and outstanding corrosion resistance and, sometimes, interesting catalytic properties, thus having potential for a widespread range of technological applications. The aim of this book is to address, from both experimental and theoretical points of view, some of the challenges to improve the glass forming ability of these materials, to optimize their overall mechanical performance, and to enhance their functional properties. Through the contributions from different renowned authors in the field, new prospects towards the development of innovative compositions and novel applications, particularly in devices with micrometer and submicrometer sizes, are provided, where the full potential of these glassy materials is being achieved.

Manufacturing and Surface Engineering

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ISBN: 9783038429791 9783038429807 Year: Pages: VI, 134 Language: english
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: General and Civil Engineering --- Materials --- Chemistry (General)
Added to DOAB on : 2018-08-09 15:59:11
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The desired properties of surface components include the improvement of different properties, such as aesthetic appearance, oxidation resistance, wear resistance, mechanical properties, electronic or electrical properties, thermal insulation, wear, triboemission and corrosion resistance through barriers.These properties can be enhanced using different methods, such as by adding a coating. Nevertheless, the bulk of the material or substrate cannot be considered independent of the surface treatment. Metal cutting is one of the general machining methods used to achieve high accuracy and productivity for metal parts.The topics of the book “Manufacturing and Surface Engineering” include the full range of surface engineering aspects, i.e., surface integrity, contact mechanics, friction and wear, coatings and surface treatments, multiscale tribology, computational methods, and optimization techniques applied in surface engineering.Recent experimental works by Zhang, Li, Zhang, Zhang and Duan, and by other researchers outlined that coating layer surface treatments may increase the damping behavior of thin-walled mechanical components vibrating in flexural conditions. Nevertheless, it was also experimentally found by the authors that most of these coating surface treatments had a negligible or null effect with respect to the vibrational damped response in testing or operating conditions. Ciniero, Le Rouzic and Reddyhoff report the potential of measuring charged particle emissions and/or tribocharging for the study or monitoring of the failure of coatings. The spatial information of triboemission allows the identification of the exact time and location of the failure. The evolution of the failure during sliding and the change in the characteristics of the contact are also monitored. After studying the effect of the Ti content on the performance of FeCoCrNiAlTix, He, Zhang, Lin, Zhang, Dong and Li establish that the structure of FeCoCrNiAlTix coatings consists of two kinds of BCC phases. With the continuous increase in Ti content, the number of eutectic structures decreases, accompanying the increase in the proeutectic phase and the Ti-rich second phase is precipitated out. Abutaha, Abdul Razak, and Ibrahim developed an experimental investigation into the engineering properties of concrete incorporating POC as an aggregate and filler material. This approach offers an environmentally-friendly solution to the ongoing waste problems associated with palm oil waste material.Liu and Janssen studied the effects of impact on the wear of the structural steel S235 in various liquids. When the impact is small, corrosion plays a dominant role, thus the sample in seawater wears the least due to the beneficial interaction with abrasion. However, when the impact is large, the wear rates of three liquids do not show a noticeable difference, because the wear mechanism changes from material removal to mainly plastic deformation. The influence of corrosion becomes a minor influencing factor when subject to impact.Vázquez Martínez, Salguero Gómez, Batista Ponce and Botana Pedemonte analyzed the different treatments obtained through setup parameter combinations to obtain samples with widely varying features, according to the thickness of the treated layer and the incidence depth of the laser beam. This diversity of samples shows a range of color tonalities from soft gold to medium gray and blue. Microstructural changes and oxidation layer generation provide a significant increase in the material hardness, reaching Vickers hardness values close to 1000 HV for high intensity treatments.Takada and Sasahara studied the FSB process using four levels of tip radius burnishing tools and investigated their effect on surface roughness, hardness and residual stress for a 0.45% C steel shaft. The thickness of the hardened layer increased as the tool tip radius decreased. The hardness value of the processed layer reached 600 HV. The residual stress on the processed surface was compressive when a radius tool with a smaller tip was used, and the residual stress turned tensile when a radius tool with a larger tip was used.Vereschaka, Kataeva, Sitnikov, Aksenenko, Oganyan and Sotova searched for patterns that allow a reliable justification for the choice of the composition of coatings and their micro- and nanostructures depending on the material being machined and the cutting regimes (in particular, the cutting speed).Amadori, Catania and Casagrande investigated experimentally eight different innovative composite solutions. A significant increase in the damping behavior was observed for all of these solutions with respect to the uncoated components, and with respect to the already known solutions that have previously been investigated by these authors and other researchers. The coating solution employing an Al2O3 powder + matrix, made using a screen-printing and curing technology on an Al alloy substrate, proved to be the most effective technology with respect to the aim of this work. Catania and Strozzi investigated the performance of different solutions in a free and forced flexural vibration response; they propose a simple model based on the assumption of a multi-layer, zig-zag beam, which also locally models the dissipative actions at the interface between the layers. Some virtual prototyping application examples are also reported.

Photovoltaic Materials and Electronic Devices

ISBN: 9783038422167 9783038422174 Year: Pages: XIV, 198 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Added to DOAB on : 2016-07-15 09:10:33
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Given the state-of-the-art in solar photovoltaic (PV) technology and favorable financing terms, it is clear that PV has already obtained grid parity in specific locations [1]. Advances in the next generation of photovoltaic materials and photovoltaic devices can further reduce costs to enable all of humanity to utilize sustainable and renewable solar power [2]. This Special Issue of Materials will cover such materials, including modeling, synthesis, and evaluation of new materials and their solar cells.Specifically, this Special Issue will focus on five material technologies for advanced solar cells:1. New Concepts in PV Materials: Nanostructured materials, low-dimensional physics, multiple charge generation, up/down converters, thermophotovoltaics, low-cost III-V materials, bandgap engineering, hot-carrier effects, plasmonics, metamorphic materials, perovskite and related novel PV materials, novel light trapping, rectennas, quantum dots, carbon nanotubes, and graphene composites.2. Organic PV Materials: Polymer, hybrid and dye sensitized solar cells, high performance contacts, and lifetime degradation and mechanisms.3. Dye-Sensitized Solar Cells (DSSCs) Materials: Recent developments in dyes, working electrodes, technologies for device fabrications, and advances in new electrolytes.4. Amorphous, Nanostructured, and Thin Film Silicon PV Materials: Microstructure characterization, light induced degradation (SWE), large area and high deposition rates, novel processing routes, light trapping, multi-layers, and multi-junction devices.5. Passive Materials for all PV: Transparent conductive oxides (TCOs), encapsulation, connections, optics, glass, anti-reflection coatings (ARCs), alternative buffer layer materials, and contacts.

Siloxane-Based Polymers

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ISBN: 9783038971252 / 9783038971269 Year: Pages: 188 DOI: 10.3390/books978-3-03897-126-9 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- Chemical Engineering
Added to DOAB on : 2019-08-28 11:21:27
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This book, a collection of 12 original contributions and 4 reviews, provides a selection of the most recent advances in the preparation, characterization, and applications of polymeric nanocomposites comprising nanoparticles. The concept of nanoparticle-reinforced polymers came about three decades ago, following the outstanding discovery of fullerenes and carbon nanotubes. One of the main ideas behind this approach is to improve the matrix mechanical performance. The nanoparticles exhibit higher specific surface area, surface energy, and density compared to microparticles and, hence, lower nanofiller concentrations are needed to attain properties comparable to, or even better than, those obtained by conventional microfiller loadings, which facilitates processing and minimizes the increase in composite weight. The addition of nanoparticles into different polymer matrices opens up an important research area in the field of composite materials. Moreover, many different types of inorganic nanoparticles, such as quantum dots, metal oxides, and ceramic and metallic nanoparticles, have been incorporated into polymers for their application in a wide range of fields, ranging from medicine to photovoltaics, packaging, and structural applications.

Keywords

fabrication --- multielectrode array (MEA) --- PDMS --- PDMS etching --- plateau-shaped electrode --- recessed electrode --- spinal cord signal recording --- underexposure --- organosilane --- quartz microcrystal --- encapsulant --- refractive index --- thermal conductivity --- poly(dimethylsiloxanes) --- surface modification --- nanosilica --- diethyl carbonate --- carbon content --- morphology --- coatings --- fillers --- hybrid hydrogel --- MAPOSS --- mechanical properties --- swelling --- drug release --- dental resin --- methacryl POSS --- shrinkage --- hardness --- scratch resistance --- ceramizable silicone rubber --- borate --- halloysite --- composite --- ceramizable mechanism --- polysiloxanes --- mortar --- basalt fibre --- roughness --- surface free energy --- poly(ethylene glycol) (PEG) --- hydrophilic --- non-releasable --- polydimethylsiloxane --- coatings --- cross-linking --- surface --- amphiphilic --- anti-bioadhesion --- hyperbranched poly(methylhydrosiloxanes) --- hydrolytic polycondensation --- 29Si-NMR --- topology of polysiloxane chains --- polyhedral oligomeric silsesquioxanes --- high molecular weight --- nanoparticles --- PDMS --- sugar templating process --- 3D porous network --- thermal stability --- TG-FTIR --- X-ray (Micro-CT) microtomography --- sol-gel --- hybrids --- chlorogenic acid --- bioactivity --- FTIR --- TG --- polysiloxanes --- theranostics --- drug delivery --- nanomedicine --- PDMS --- silicon --- ultraviolet (UV) curable coatings --- low surface energy materials --- fluorinated siloxane resin

Polymeric Materials: Surfaces, Interfaces and Bioapplications

Authors: --- --- --- --- et al.
ISBN: 9783038979623 / 9783038979630 Year: Pages: 342 DOI: 10.3390/books978-3-03897-963-0 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Physics (General)
Added to DOAB on : 2019-06-26 08:44:06
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This book collects the articles published in the Special Issue “Polymeric Materials: Surfaces, Interfaces and Bioapplications”. It shows the advances in polymeric materials, which have tremendous applications in agricultural films, food packaging, dental restoration, antimicrobial systems, and tissue engineering. These polymeric materials are presented as films, coatings, particles, fibers, hydrogels, or networks. The potential to modify and modulate their surfaces or their content by different techniques, such as click chemistry, ozonation, breath figures, wrinkle formation, or electrospray, are also explained, taking into account the relationship between the structure and properties in the final application. Moreover, new trends in the development of such materials are presented, using more environmental friendly and safe methods, which, at the same time, have a high impact on our society.

Keywords

corn stalk fiber --- friction composite --- friction and wear --- worn surface morphology --- antifouling coatings --- biofouling --- natural biofilms --- single-stranded conformation polymorphism --- polydimethylsiloxane --- multidimensional scale analysis --- antimicrobial coatings --- porous surfaces --- breath figures --- antimicrobial polymer --- coatings --- hydrogel --- protein-repellent polymer --- surface-attached polymer network --- polymer cross-linking --- alginate modification --- calcium chloride --- microparticles --- spray drying --- prolonged drug release --- gradient wrinkles --- UV/ozone --- irradiance --- polymeric composites --- bonding agents --- antibacterial --- oral biofilms --- periodontal pathogens --- caries inhibition --- recycling --- polypropylene --- biodegradable polymers --- degradation --- inmiscibility --- hemicelluloses --- chitosan --- composite films --- oxygen barrier property --- food packaging --- nanosecond laser surface modification --- ABS (Acrylonitrile-Butadiene-Styrene) --- surface wettability --- superhydrophobic --- superhydrophilic --- poly(x-chlorostyrene) --- honeycomb --- breath figures --- conformational entropy --- spinal anatomy --- intervertebral disc --- degenerative disc disease --- herniated disc --- spinal fusion --- total disc replacement --- tissue engineering --- Electrically conductive polymers --- Electroactive biomaterials --- Electrical stimulation --- Smart composites --- Bioelectric effect --- Drug delivery --- Artificial muscle --- bio-based --- fossil --- hybrids --- blends --- packaging --- bio-based polymers --- antimicrobial --- biodegradable --- sustainable --- eco-friendly --- graphene oxide --- chitosan --- composites --- scaffolds --- tissue engineering --- surface modification/functionalization --- surface segregation --- micro- and nanopatterned films --- blends and (nano)composites --- coatings --- surface wettability --- stimuli-responsive materials/smart surfaces --- bioapplications

Advanced Glasses, Composites and Ceramics for High Growth Industries

Authors: --- ---
ISBN: 9783038979609 / 9783038979616 Year: Pages: 186 DOI: 10.3390/books978-3-03897-961-6 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering --- Materials
Added to DOAB on : 2019-06-26 08:44:06
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Advanced Glasses, Composites and Ceramics for High-Growth Industries (CoACH) was a European Training Network (ETN) project (http://www.coach-etn.eu/) funded by the Horizon 2020 program. CoACH involved multiple actors in the innovation ecosystem for advanced materials, composed of five universities and ten enterprises in seven different European countries. The project studied the next generation of materials that could bring innovation in the healthcare, construction, and energy sectors, among others, from new bioactive glasses for bone implants to eco-friendly cements and new environmentally friendly thermoelectrics for energy conversion. The novel materials developed in the CoACH project pave the way for innovative products, improved cost competitiveness, and positive environmental impact. The present Special Issue contains 14 papers resulting from the CoACH project, showcasing the breadth of materials and processes developed during the project.

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

Author:
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

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