22 hasil untuk "Hamada Elsayed"
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Artikel Jurnal Teks lengkap
Bioceramics Prepared from Polymer Precursors: From Synthesis to Advanced Additive Manufacturing
Polymer-derived ceramics (PDCs) technology has been established for over five decades as a versatile route for the fabrication of advanced bioceramic materials. However, conventional processing routes for bioceramics, such as melt-quenching and sol–gel methods, still present significant…
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Co-extrusion of highly loaded feedstocks for fabrication of stainless steel-bioceramic core-shell structures
Co-extrusion of multi-materials structures shows technological challenges and opportunities. Filaments made of a metallic core and a ceramic shell are one example of how structural and functional features can be combined in a single component to provide a synergic effect. In this work, we focused…
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Biosilicate® Glass-Ceramic Foams From Refined Alkali Activation and Gel Casting
Biosilicate® glass-ceramics are among the most valid alternatives to 45S5 Bioglass. They combine a similar bioactivity and bioresorbability as the 45S5 with superior mechanical strength, owing to the crystallization of a Na–Ca silicate phase. This crystallization may be experienced upon viscous…
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Structural, Optical, Magnetic and Electrical Properties of Sputtered ZnO and ZnO:Fe Thin Films: The Role of Deposition Power
Structural, optical, magnetic, and electrical properties of zinc oxide (henceforth, ZO) and iron doped zinc oxide (henceforth, ZOFe) films deposited by sputtering technique are described by means of Rutherford backscattering spectrometry, grazing incidence X-ray diffraction, scanning electron…
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Nearly room-temperature fabrication of waste glass-derived foams for sustainable insulation
A substantial proportion of glass waste is disposed of in landfills due to the limitations of conventional recycling methods in processing articles with specific chemical compositions or contamination, such as serigraphed glass, borosilicate glass, and glass mud residues. This study proposes an…
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Masked stereolithography of wollastonite-diopside glass-ceramics from novel silicone-based liquid feedstock
Silicate bioceramics, including systems based on the simultaneous presence of wollastonite (CaSiO3) and diopside (CaMgSi2O6), are of great interest in bone tissue engineering applications, especially in form of variously shaped three-dimensional scaffolds, as determined by application of several…
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Sustainable construction materials from alkali-activated waste fiberglass and waste refractory
In this work, waste fiberglass was up-cycled, alone, or mixed with used alumina-zirconia-silica (AZS) refractory from dismantled glass melting furnaces. Alkali activation was performed by suspending fiberglass and fiberglass/AZS powders in NaOH aqueous solution of various concentrations (8M, 6M…
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Large scale additive manufacturing of artificial stone components using binder jetting and their X-ray microtomography investigations
Additive manufacturing of large scale parts is an innovative, challenging research field, with the potential of producing parts with complex structures, specific functional and structural properties. In this study, binder jetting was employed using two different large scale printers to fabricate…
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Direct Ink Writing of cylindrical lattice structures: A proof of concept
Printing curved lattice structures is a demanding task due to the current limitations in standard 3-axes printing technologies available in the market: a removable support structure often needs to be printed, and printing layer-by-layer to generate an inclined surface causes a significant…
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Robocasting of advanced ceramics: ink optimization and protocol to predict the printing parameters - A review
Direct-Ink-Writing (or robocasting) is a subset of extrusion-based additive manufacturing techniques that has grown significantly in recent years to design simple to complex ceramic structures. Robocasting, relies on the use of high-concentration powder pastes, also known as inks. A successful…
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Functionalization of LCD glass for the manufacturing of advanced 3D-printed translucent photocatalytic scaffolds
In this paper, we discuss the functionalization of translucent glass scaffolds obtained from LCD glass waste with a photocatalytic coating. Scaffolds were in the form of four-layer lattices and gyroids, depending on the printing technology, such as direct ink writing and masked stereolithography…
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Upcycling waste derived glass into high-performance photocatalytic scaffolds by alkali activation and direct ink writing
Novel and eco-friendly solutions are extensively needed for wastewater treatment. This work capitalizes on the combination of waste vitrification and additive manufacturing to produce an efficient photocatalyst for the specific purpose. Fine powders of waste-derived glass, containing Fe3O4…
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Microstructure, Mechanical and Thermal Properties of ZTA/Al2TiO5 Ceramic Composites
Zirconia-toughened alumina (ZTA)/Al2TiO5 composites were prepared via a sol–gel route. The prepared samples were uniaxially pressed and pressurelessly sintered at 1650–1700 °C for 1 h. The microstructure, densification, and X-ray diffraction patterns of the sintered ZTA/Al2TiO5 composites were…
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3D Printing of Hierarchically Porous Lattice Structures Based on Åkermanite Glass Microspheres and Reactive Silicone Binder
The present study illustrates the manufacturing method of hierarchically porous 3D scaffolds based on åkermanite as a promising bioceramic for stereolithography. The macroporosity was designed by implementing 3D models corresponding to different lattice structures (cubic, diamond, Kelvin, and…
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Assessment of in-vitro bioactivity, biodegradability and antibacterial activity of polymer-derived 3D printed åkermanite scaffolds
Reticulated åkermanite (Ca2MgSi2O7) 3D scaffolds were fabricated by direct ink writing of pastes based on a commercial silicone resin and fillers, such as calcium carbonate (CaCO3) and magnesium hydroxide (Mg(OH)2) microparticles, followed by heat treatment at 1100 °C in air. To form liquid phase…
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Attack of discarded soda-lime glass with sodium aluminate for the manufacturing of sustainable geopolymer components
Discarded soda-lime glass (SLG) may contain small amounts of ceramic, metallic, and polymeric contaminants, therefore recycling of this material is far from ideal. The quality of newly made glass products made by remelting of cullet, as a result, declines. Consolidation at low temperatures to form…
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Ion-exchange enhancement of borosilicate glass vials for pharmaceutical packaging
Pharmaceutical containers for parenteral use, including vials, ampoules, prefilled syringes, and cartridges, are traditionally made of glass. However, the most commonly used type, borosilicate glass, is susceptible to issues such as breakage, corrosion, and delamination, which can jeopardize the…
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Direct ink writing of lightweight 3D structures from alkali-activated waste fiberglass and glass microsphere fillers
This study explores the upcycling of glass waste into sustainable materials using additive manufacturing. The direct ink writing technique was used to 3D print structures from waste fiberglass activated with 3 M or 5 M NaOH. All inks showed shear-thinning behavior after 3 h of mixing, ensuring good…
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Additive manufacturing of alumina refractories by binder jetting
In this work, refractory components based on alumina were produced by binder jetting using a large-scale 3D printer. The formulation contained several particle fractions up to a grain size of 3 mm, equal to the printer resolution. The binder system contained fine dead burnt magnesia, milled citric…
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Effect of Additively Manufactured Sphene Ceramic Scaffolds on Bone Response in Rat Critical-Size Calvarial Defects
Silica-based bioceramics are promising bone substitutes with tunable degradation and mechanical properties. We aimed to assess bone response in critical-size calvarial defects in rats, empty or filled with 3D-printed sphene ceramic (CaTiSiO5) scaffolds produced using direct ink writing from…