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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"DIW"”.
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Enabling New Material and Process Capabilities for Ultraviolet-Assisted Direct Ink Write Additive Manufacturing via Exploration of Material Rheology and Reactivity
Ultraviolet-Assisted Direct Ink Write (UV-DIW) is a material extrusion additive manufacturing (AM) technology in which a viscous ink, often at room temperature, is selectively extruded through a translating nozzle to selectively deposit material. The extruded ink is solidified via UV irradiation …
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Optimalizace procesu 3D tisku oxidu hlinitého metodou Direct Ink Writing
… moderní technologie Direct Ink Writing tisku (DIW). Byly popsány podfunkce DIW tisku a vztah tisknutelnosti a reologie vhodných materiálů. V experimentální části byla běžná Fused Filament Fabrication 3D tiskárna přestavěna a přenastavena na DIW technologii. Dále byly připraveny keramické pasty …
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Characterization of the Integration of Additively Manufactured All-Aromatic Polyimide and Conductive Direct-Write Silver Inks
… ultraviolet-assisted direct ink write (UV-DIW) all-aromatic polyimide (PI) provides an opportunity to address these previous shortcomings previously due to its high-temperature stability (450C) and superior surface finish (relative to other AM processes). The primary goal of this thesis is …
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Evaluation of Nanobubble Water Irrigation For Removing Biofilm-Mimicking Hydrogel in Premolars With Type II Canal Systems
… satisfied the assumption of normality except DIW + SA, which showed a significant deviation from normality (W = 0.7702, p = 0.0063). Therefore, fluorescence values were compared using Welch’s one-way ANOVA, which demonstrated a statistically significant difference in mean fluorescence across …
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The Effect of Silver Diamine Fluoride on Caries Lesion Remineralization as a Function of Lesion Baseline Mineral Distribution
… fluoride varnish (FV), and deionized water (DIW) was the negative control. By utilizing three lesion creation protocols (methylcellulose [MeC], hydroxyethylcellulose [HEC], Carbopol [C907]), artificial caries lesions with different mineral distributions (n=20 per subgroup) were created in the …
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Effect of Dispersion on Rheology and 3D Printing of Chitosan-Graphene-Titanium Dioxide Composites
… (AM) process called direct ink write (DIW) with polymer composite ink, it is possible to create parts with tailored internal microstructures that enhance surface area and particle-particle adsorption kinetics for water remediation applications. However, DIW of particle-filled systems …
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Effects of Water-Soluble Binders on Direct Ink Writing Silicon Anode in Lithium-Ion Batteries
… capacity and employs direct ink writing (DIW), an additive manufacturing method, to fabricate intricate in-house anodes. These anodes are tailored for small electronics, sensors, or medical devices, highlighting the potential of DIW in creating complex-shaped electrodes. A significant …
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Anti-Caries Efficacy of Fluoride at Increasing Maturation of a Microcosm Biofilm
… Amine fluoride (AmF); and deionized water (DIW- negative control)) at increasing maturation of a microcosm biofilm. We continued the pH cycling protocol for 4 days, 8 days, and 12 days. We tested biofilm cariogenicity and carious lesion severity at each maturation stage. In the third aim, we …
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Patterning temporally dynamic 4D hydrogel and nanocomposite material gradients: predictive cellular and actuator responses
Direct-Ink Writing (DIW) is a facile form of additive manufacturing that elevates three-dimensional (3D) printed structures into materials regimes whose chemistries enable them to be temporally dynamic (4D). A series of dynamic material systems is prepared that applies DIW methodologies and design …
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Functional Microperiodic Polyacrylamide Gels Fabricated by Opal Inversion and Direct-Write Processes
… FCC lattice of polymer, and direct ink writing (DIW) in which a continuous filament is patterned layer-by-layer into a defined structure.
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Primary Coronal Caries Prevention with Silver Diamine Fluoride – Investigations into Efficacy and Mode of Action
… [AgNO3]) controls to SDF and deionized water (DIW) in preventing enamel demineralization and enhancing remineralization using chemical, biofilm and pH-cycling models. In both chemical demineralization and pH-cycling models there were no statistically significant differences between SDF and …
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Rheology of Filled and Unfilled Polyurethanes for Reactive Extrusion-Based Applications
… To combat these challenges, direct ink write (DIW) AM extrudes highly viscous composites by applying pneumatic backpressure to a syringe, such that the material can be extruded in ambient conditions. This method enables processing of unreacted, thermosetting resins which have been filled with a …
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Processing to Enable Direct-Write Additive Manufacturing of Ceramics and Ceramic Composites
… (AM), specifically the direct ink writing (DIW) and Ceramic On-Demand Extrusion (CODE) manufacturing processes, in order to produce ceramic and ceramic-based composite components. Strongly dispersed, concentrated (φ = 0.42), nanoparticle (d<sub>50</sub> ~0.3 µm), zirconia (ZrO<sub>2</sub>) …
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Tailoring Reactivity, Architecture and Properties of High Performance Polyimides: From Additive Manufacturing to Graft Copolymers
… via ultraviolet assisted direct ink write (UV-DIW) printing. Precursor resins exhibited prerequisite rheology and reactivity for UV-DIW and produced organogels were well-defined and self-supporting. Thermal treatment induced drying and imidization of the precursor organogels to form the desired …
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Interaction between tin/flouride-containing solutions and artificially created dental pellicles on erosion prevetion in vitro
… SnCl2/NaF, NaF, SnCl2 and deionized water (DIW) (as negative control). Forty bovine enamel and dentin specimens 104 (4x4x2 mm3) were prepared and randomly distributed into 4 groups (n = 10). The specimens were incubated in clarified human saliva (CHS) for 24 h for pellicle formation and then …
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Design and evaluation of neuroregenerative properties of 4D hydrogel scaffolds
… cell-scaffold interactions. Direct ink writing (DIW) is prominent among fabrication techniques relevant to tissue engineering due to its versatility in terms of the range of materials that can be used and the limitless geometries that are easily programmed. This thesis describes three different …
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Rheological and Thermal Insights into Solidification Dynamics in Extrusion-Based Additive Manufacturing of Polymer Composites
… through small-format direct ink writing (DIW) is presented in Chapter 2.2. The key rheological requirements for effective processing are highlighted, and a brief explanation of chitosan hydrogels is included, as this is the only non-semicrystalline polymer used in this dissertation. …
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Analysis of slurry composition for the direct ink writing of mayenite electride for use in thermionic cathodes
… slurry composition for direct ink writing (DIW). As the ink composition is critical to the success of any direct ink writing process, an in depth analysis was performed on mayenite slurries, which focused on different solvents, binders, and the dispersion of the ceramic particles. Water and …
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Cellulose Nanofoams: 3D Printing and Characterization
… (3D) structures using direct-ink-write (DIW) technology and molding. We developed composite nanofoams using TEMPO-modified cellulose nanofiber (TCNF). The resultant composite nanofoams showcased remarkable properties such as ultra-low thermal conductivity, low density, outstanding …
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Effect of chemical mechanical planarization processing conditions on polyurethane pad properties
… temperatures and soaking the pad in slurry and DIW for up to two months. The properties of the CMP pad were then measured using four thermo analytical tools - dynamic mechanical analyzer (DMA), thermo-gravimetric analyzer (TGA), thermomechanical analyzer (TMA), and modulated differential …
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