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.
Results
Showing 1 to 20 of 30 for “"Direct Writing"”.
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Array -Based Direct Writing of Micro/nano Scale Structures
Applications of these integrated processing elements have been demonstrated by using them to print micro/nano scale patterns using the electro-hydrodynamic (EHD) printing process.
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Towards Direct Writing Of 3-d Photonic Circuits Using Ultrafast Lasers
… be achieved by other current techniques. Laser direct writing has emerged as one of the possible routes for fabrication of optical waveguides in transparent materials. In this thesis, the advantages and limitations of this technique are explored. Two extended-cavity ultrafast lasers were built …
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Direct writing of functional materials for milk point-of-care tests
Direct writing has been used in recent years as an emergent and potential fabrication method for the development of affordable point-of-care applications. This thesis focuses on the application of direct writing methods for milk point-of-care tests, specifically for the detection of residual …
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Direct writing of three-dimensional nanostructures and their application in nanomagnetism
… is capable of realizing general 3D geometries directly from standard 3D printing files. The algorithm has been extensively tested with different precursors and structure designs, demonstrating the effectiveness of both the model and the calibration procedure. The application of the developed 3D …
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Additive manufacturing of non plastic porcelain material by direct writing and freeze casting.
Two direct consolidation methods usually used for advanced ceramics have been combined in this project in order to develop a novel fabrication route for traditional ceramics. Specifically the method used is based on the Additive Manufacturing extrusion process using direct writing of high solid …
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Scanning tunneling microscopy and spectroscopy of tip-induced direct writing of nanometallization in ultra-high vacuum
This thesis discusses scanning tunneling microscopy (STM) nanometallization on Si(100):H of HfB2 and MgB2. We first give an introduction to graphene nanoribbons (GNRs) along with STM and the techniques therein. We found that with STM, self-standing nanoscale features including dots, wires, and 3D …
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Femtosecond laser writing in transparent materials
… index bismuth borate glass by femtosecond laser direct writing. Broadening of the transmitted light source by as much as 500 nm was demonstrated through a waveguide with a length of 1.8 cm. Finally, passive waveguide components such as Y-splitters and directional couplers have also been …
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Solid state electrochemical processes for nanofabrication
… simple alternative to state of the art direct writing techniques (e.g. Ebeam lithography and Focus ion beam lithography). First, a solid state electrochemical direct writing technique is developed using a conductive atomic force microscopy (AFM) tip for rapid prototyping of silver …
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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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Pen-on-paper electronics
… electronics: (1) rollerball pen printing and (2) direct ink writing (DIW). Conductive silver and resistive carbon particle-based inks are created for direct writing of flexible electronics. Specifically, a new silver ink is synthesized that enables printing of high conductivity features, …
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Direct Ink Writing of Functional Fiber/Granular Composites
<p>Direct ink writing provides a versatile manufacturing route for fabricating functional fiber and granular composites with controlled architecture, tunable interfaces, and customized material distributions. Fiber reinforced composites offer high stiffness, strength, fatigue resistance, and …
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Deaf ways of writing narratives : translation vs. direct composition in deaf groups with different bilingual skills
This thesis investigates the writing process in narratives by Greek deaf students in two different conditions: a) translation from Greek Sign Language into written Greek from video stimuli and b) direct composition in written Greek from picture stimuli. Following language assessments, the deaf …
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Novel Inorganic Photoresists for Three-Dimensional Microfabrication
Inorganic photoresists that can be directly patterned in three dimensions via both 3D laser direct writing and 3D interference lithography based fabrication approaches are attractive materials for the fabrication of complex microfluidic and micro-optical components such as chaotic mixing elements …
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Laser direct written silicon nanowires for electronic and sensing applications
… as thin as 60 nm are synthesized using laser direct writing in combination with chemical vapor deposition, which has the advantages of in-situ doping, catalyst-free growth, and precise control of position, orientation, and length. The synthesized nanowires have been fabricated into field …
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Nanostructure fabrication by electron and ion beam patterning of nanoparticles
… been investigated, namely focused ion beam (FIB) direct-writing of nanoparticles, and a technique for electrostatically patterning ionized inorganic nanoparticles, termed nanoxerography. A FIB has been used to directly pattern thin films of organometallic Ag-precursors down to a resolution of 100 …
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Flexible Fabrication of Multi-scale Integrated 3D Periodic Nanostructures with Phase Mask
… as one particular kind of DOE, are a promising direction for simple and rapid fabrication of 3D periodic nanostructures by means of Fresnel diffraction interference lithography. When incident with a coherent beam of light, a suitable phase mask (e.g. with 2D nano-grating) can create multiple …
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Optical Printing of Multiscale Hydrogel Structures
… digital projection stereolithography and laser direct writing have been used to shape hydrogels into structurally complex functional devices and constructs. However, it is still greatly challenging for researchers to design and fabricate multiscale hydrogel structures using a single fabrication …
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Direct UV writing of structures in lithium niobate and lithium tantalate
… thesis presents results from fabrication of UV direct write structures in lithium niobate and lithium tantalate. Unassisted direct writing of surface channel waveguides using lambda = 244 nm cw light resulted in polarisation specific waveguides fabricated on z- cut crystals. Waveguides were …
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Scanning tunneling microscopy and spectroscopy of nanometer scale metallic features on silicon surfaces
… DB wire can be ~2.5 nm along the dimer row direction. The perturbation of an unpaired DB to an adjacent paired DB is also demonstrated. Second, sub-5 nm HfB2 metals can be direct written on the Si surface using STM electron beam induced deposition (STM-EBID). Nanoscale contacts between HfB2 …
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Bangolaidžių integravimas į lydytą kvarcą panaudojant femtosekundinius šviesos impulsus /
… various three dimensional photonic devices directly into the bulk of transparent materials. One of the simplest yet most versatile of such devices when it comes to enabling light manipulation inside a piece of transparent medium, necessary in such areas as optical communication, …
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