Global ETD Search
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 67 for “"direct write"”.
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Direct-write assembly of colloidal materials
… This thesis describes the development of direct-write assembly, a process combining the bottom-up principle of colloidal self-assembly with the versatility of direct-write 3-D printing. Direct-write assembly is performed by precision dispense of a colloidal suspension from a fine needle …
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Laser direct-write fabrication of MEMS
Micro-electromechanical systems (MEMS) have many applications in healthcare, consumer electronics, and automobile industry. Unfortunately, the development of novel MEMS is significantly hindered by the limitations of the state-of-the-art MEMS microfabrication processes such as high cost of …
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Hybrid inkjet and direct-write multi-material additive manufacturing
… additive manufacturing technologies - inkjet and direct-ink writing - are combined in a hybrid system. Several advantages are realized due to the increased material library and geometric freedom as a result of new printing modalities. Initially, models of each process are reviewed and the …
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Hybrid direct write lithographic strategies for complex hierarchical structures
… morphology over a large area combined with laser direct write. The process of drawing a single line or isolated voxel can result in a hierarchical pattern defined by the latent motif of the larger-scale technique. The net result is to shift the burden of high resolution patterning from the direct …
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Direct-write assembly of 3D microperiodic scaffolds for tissue engineering applications
… microperiodic scaffolds have been fabricated by direct-write assembly for tissue engineering. Such scaffolds are necessary to accurately mimic the complex environment of real tissues. Three distinct inks have been developed: (1) a hydrogel ink that contains high molecular weigh chains of …
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Direct-Write Electrospinning of Highly-Loaded Ceramic Slurries for Additive Manufacture
Ceramics are desirable materials for a range of mechanical, electrical and biomedical applications, but they can be difficult to form and process. Additive manufacture is increasingly being explored for producing ceramic parts without moulds. In this work, a method for controllably patterning …
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Processing to Enable Direct-Write Additive Manufacturing of Ceramics and Ceramic Composites
… processing of novel feedstocks for and during direct-write additive manufacturing (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 …
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Biphasic Nanoparticle Inks for Direct Write Assembly of Three-Dimensional Periodic Structures
Novel nanoparticle inks have been created for the direct-write assembly of 3-D periodic structures with fine scale (∼ 10 mum) features. These nanoparticle inks are composed of two populations of nanoparticles defined by the type of dispersant used to stabilize them, either poly(acrylic …
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Colloidal and Polyelectrolyte Inks for Direct -Write Assembly of 3D Periodic Structures
"Novel inks were developed for the direct-write assembly of 3D periodic structures with varying feature size. Specifically, two ink designs were pursued: (1) a model colloidal ink (feature size > 100 mum) and (2) a polyelectrolyte ink (feature size ∼ 1 mum). The rheological properties of both …
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Functional Microperiodic Polyacrylamide Gels Fabricated by Opal Inversion and Direct-Write Processes
… yields an inverted 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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Iterative learning control of direct write additive manufacturing using online process monitoring
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Freeform, direct-write assembly of thermoplastics and glasses: Theory, practice, and applications
… subset of additive manufacturing, broadly termed direct-write assembly, in which material is deposited through a translating nozzle onto a curved surface, across spanning gaps, into a fluid reservoir, or in free space. The latter approach, referred to here as freeform assembly, is particularly …
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Direct-Write Assembly of Three-Dimensional Polyelectrolyte Scaffolds, Inorganic Hybrids, and Photonic Crystals
… 3D microperiodic polymer scaffolds assembled by direct ink writing. First, polymer woodpiles with a face-centered tetragonal geometry are fabricated by direct ink writing. Chemical vapor depositions of silica and germanium are then performed under controlled conditions to produce optimal layer …
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The Fabrication of Integrated Strain Sensors for “Smart” Implants using a Direct Write Additive Manufacturing Approach
… using the nScrypt 3Dn-300 micro dispensing direct write (MDDW) system. Silver and carbon electrical resistance strain gauges were fabricated and characterised. Carbon resistive strain gauges with gauge factor values greater than 16 were measured using a proven cantilever bending arrangement. …
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Nanoparticle and Sol -Gel Inks for Direct -Write Assembly of Functional Metallic and Metal Oxide Materials
… of low-power, gas sensor devices based upon direct-write assembled TiO2 microwire arrays.
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Characterization of the Integration of Additively Manufactured All-Aromatic Polyimide and Conductive Direct-Write Silver Inks
… additive manufacturing (AM) structures and direct write (DW) deposition of conductive traces enables the design and physical creation of integrated, complex, and conformal electronics such as embedded electronics and complex routing on a fully AM structure. Although this hybridization has a …
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Modeling and control of an easy-to-use direct write printing system for fabrication of bone scaffolds
This Thesis was approved for publication on 2017-07-21 at 08:17.
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Hybridization of PolyJet and Direct Write for the Direct Manufacture of Functional Electronics in Additively Manufactured Components
… layers. This process, in conjunction with direct write (DW) of conductive materials, enables the direct manufacture of parts featuring embedded electronics, including interconnects and sensors. The scope of previous works in which DW and AM processes are combined has been limited to single …
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