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Showing 1 to 20 of 22 for “"fiber drawing"”.
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Polyethylene fiber drawing optimization
Polymer fiber drawing creates fibers with enhanced thermal conductivity and strength compared to bulk polymer because drawing aligns the molecular chains. I optimize the polymer fiber drawing method in order to achieve polymer fibers that are drawn to lengths exceeding 1cm and develop a method to …
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Fiber drawing : beyond the scaling paradigm
The emergence of multimaterial fibers that combine a multiplicity of solid materials with disparate electrical, optical, and mechanical properties into a single fiber presents new opportunities for extending fiber applications. Different functional fiber devices have been fabricated with a thermal …
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Customizing Multifunctional Bidirectional Neural Interfaces through Fiber Drawing
… signals over an extended period of time. Fiber drawing enables the fabrication of biocompatible multifunctional flexible fibers that record and modulate neural activity. However, constraints on the thermomechanical properties of materials have prevented the fiber integration of metals and …
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Synthesis and Characterization of Si, Ge, and SixGe1-x Nanowires by Fiber Drawing
… first time SiGe alloys are produced in optical fiber from a mixture of the two powders across the entire compositional range. A discussion of the properties of silicon and germanium and their alloys is given with emphasis on the differences between properties at the bulk scale and at the …
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Model-free tracking control of an optical fiber drawing process using deep reinforcement learning
… approach for tracking control of an optical fiber drawing process is developed and evaluated. The DRL-based control is capable of regulating the fiber diameter to track either steady or varying reference trajectories in the presence of stochasticity and non-linear delayed dynamics of the …
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Improved draw process in optical fiber fabrication
The performance of an optical fiber depends to a great extent on the conditions of the process being used to draw the fiber from a glass preform. To get fibers with higher strength and lower transmission loss, the parameters of the draw process must be optimized and the geometric uniformity of the …
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A Data-Driven Approach to System Dynamics Modeling and Control Design
… on modeling and simulation of an optical fiber extrusion system and its controllers in production. With measured production data during the fiber drawing process, a long short-term memory (LSTM) neural network is architected, implemented, and trained to model the process dynamics of the …
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Modeling of fluids and waves with analytics and numerics
… role in experimental work such as multimaterial fiber drawing and multilayer particle fabrication. Motivated by complex multi-fluid geometries currently being explored in these applications, we theoretically and computationally studied capillary instabilities in concentric cylindrical flows of N …
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Understanding the Role of Gravity in the Crystallization Suppression of ZBLAN Glass
… region. However, crystallites formed during the fiber drawing process prevent this glass from achieving its low loss-capability. Other researchers have shown that microgravity processing leads to suppressed crystal growth in ZBLAN glass, which can lead to lower transmission loss in the desired …
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Application of Machine Learning in Process Control in Optical Fiber Manufacturing
… use of Machine Learning models in the optical fiber manufacturing industry. Utilizing measured production data from the fiber drawing tower, a long short-term memory (LSTM) neural network structure is used to find the correlation between the inputs and outputs of the process. Different …
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NeuroModular - A Modular Backend for Fiber-Based Wireless Bioelectronic Interfaces
Multifunctional microelectronic fibers are a new class of bioelectronic interfaces that combine the scalability and customization afforded by fiber drawing with the functional maturity of solid-state microdevices. Wireless operation of multifunctional fiber-based devices would allow neuromodulation …
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Processing of composite fibers based on polypropylene and a thermotropic liquid crystalline polymer
… liquid crystalline polymer (TLCP), in two novel fiber spinning processes. In one process, a single VB melt stream was surrounded by a sheath of PP in a manner comparable to a wire coating process just prior to melt spinning to generate fibers possessing a sheath-core structure. The other process …
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Flexible fibers for optoelectronic probing of spinal cord circuits
… and neural recording. In this thesis, fiber drawing techniques are applied to produce flexible and stretchable probes. The utility of the devices for recording and optical stimulation is demonstrated in the spinal cord of transgenic mice expressing the light sensitive protein …
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Multilayer composite photonic bandgap fibers
… of multilayer composite photonic bandgap fibers. The pertinent background in electromagnetic theory of multilayer dielectric mirrors and optical fibers is surveyed. Materials properties constraints are outlined, with emphasis on those constraints related to processing strategy and ultimate …
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Multimaterial rectifying device fibers
… to be incompatible with much simpler thermal drawing techniques used in optical fiber production. The incorporation of metals, polymer insulators, and chalcogenide semiconductors into structured fibers has reversed this paradigm and made it possible to realize optoelectronic device …
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Multimaterial Fibers for Biosensing Application Using Electrochemistry
… component. Multimaterial electrode-embedded fibers are used as the sensing electrode and the electrode material presented is platinum (Pt). Platinum is employed because of its biocompatibility property. The electrodes are placed in the fiber by the method of convergence fiber drawing and the …
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Multifunctional Wireless Gut-Brain Neurotechnology
… that overcome thermomechanical constraints of fiber drawing and allow processing of traditionally non-drawable components. These advances yielded multifunctional probes that allow depth specific optical, electrical, and pharmacological probing of neural circuits in the brain, while also being …
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Analysis of structural development during superdrawing of poly(ethylene terephthalate) fibers
… limitations in processing conditions for superdrawing. Experimental studies were carried out by uniaxial drawing tests at temperatures from 90 to 120°C and at strain rates ranging from 0.008/s to 0.425/s. Crystallinity and orientation of the drawn samples were evaluated using differential …
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The Manufacture and Mechanical Properties of Poly(ethylene terephthalate) Fibers Filled with Organically-Modified Montmorillonite
… to poly(ethylene terephthalate), PET, fibers by the addition of layered silicate nanoparticles and by drawing the un-oriented nanocomposite filaments in a second step. No previous studies on PET fibers filled with montmorillonite (MMT) nanoclay examined fiber drawability at temperatures …
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Advanced light manipulation and waveguiding in plasmonic nanostructured optical fibers.
Conventional optical fibers are well-known for their efficient light guiding mechanism. However, the dielectric properties of core and cladding materials (e.g.- doped silica and silica glasses) limit the functionality of the optical fibers. Therefore, the optical properties of the fibers, such as …
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