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 12 of 12 for “"Composite fibers"”.
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Experimental and modeling investigation of cellulose nanocrystals polymer composite fibers
… agents. However, in order to develop CNC nanocomposites with industrial applications, it is necessary to understand how addition of CNCs affect the properties of the polymer nanocomposite. In the present work, several approaches, experimental and theoretical, are presented in an effort to …
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Processing of composite fibers based on polypropylene and a thermotropic liquid crystalline polymer
… process just prior to melt spinning to generate fibers possessing a sheath-core structure. The other process involved the distribution of continuous VB melt streams within a separately plasticated PP melt to form a composite melt which was drawn to create matrix-fibril fibers consisting of a PP …
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Wet-spinning and thermal analysis of collagen fibers incorporating hydroxyapatite in mixed and coated form
… This study involved the wet-spinning of collagen fibers incorporating HA in mixed and coated form. The weight percent ratio of collagen and HA in the composite fibers was 95 to 5 respectively. HA coating on pure collagen fibers was achieved by immersing them in HA solution formed by mixing HA in …
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Manipulation of Carbon Nanostructures for Multifunctional Composite Materials
Composite fibers comprised of 5:95 wt ratio of ultra-short single walled carbon nanotubes (US-SWCNT):polyacrylonitrile (PAN) were spun using a dry-jet wet-spinning method followed by oxidative stabilization at 285 °C. The as-spun and stabilized composite fibers exhibited a 50 and 40 % increase, …
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Forming of advanced composite materials
Two significant aspects of advanced composite material forming are examined. First, the fiber deformation of aligned fiber composites formed to double curvature parts is analyzed. Aligned fiber composite lay-ups were formed over hemispherical tools and the fiber deformation was mapped. The data …
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Tunable micro-cavities in photonic band-gap yarns and optical fibers
… length-scales. The optical properties of these fibers derive from their multilayer dielectric photonic band-gap structure that exhibits omnidirectional reflectivity. The theoretical tools needed to design, analyze and optimize such structures are introduced. We show that defect layers in these …
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Tension-induced tunable corrugation in two-phase soft composites and its properties as a band gap structure
… elastic deformation response of a two-phase soft composite under externally applied concentric tension and its properties as a band gap structure. By carefully designing the inclusion pattern, it is possible to induce corrugations normal to the direction of stretch. By stacking 1D composite fibers …
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Understand The Structure-Water-Responsive Relationship by Engineering Silk Materials
… for scaling up silk-based WR materials, WR silk composite fibers were developed by coupling nanoscale <em>Bacillus Subtilis</em> peptidoglycan (PG) with silk using a wet-spinning technique. This work provides proof-of-concept demonstrations that use high-energy, muscle-like WR actuators for …
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Nanotube reinforced thermoplastic polymer matrix composites
… attractive reinforcements for polymer matrix composites. However, the structure that makes them desirable also causes highly anisotropic properties and limited reactivity with other materials. This thesis isolates these problems in two separate studies aimed at improving mechanical properties …
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Nanosoldering carbon nanotube fibers and graphene nanoribbon thin film transistors
… involves using carbon nanotubes (CNTs) to build composite structures such as fibers. In the past, our group developed the “nanosoldering” technique to solder carbon nanotube junctions which significantly improved the electrical properties of CNT transistors. For the purpose of our work, we apply …
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Characterization of Aligned Carbon Nanotube/Polymer Composites
… polymer matrices to obtain an orthotropic composite whose strength, stiffness and electrical properties depend on the orientation of the SWNTs. The SWNTs are successfully dispersed and aligned in a polyimide matrix and a polymer blend of UDMA/HDDMA. In-situ polymerization under sonication …
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Electrospun nanofibrous metal oxides as regenerable adsorbents for desulfurization of biomass-derived syngas
… having high aspect ratio, like nanofibers, can remain isolated; thus, potentially providing a more suitable framework for carrying out frequent cyclic sulfidation-regeneration operation. These high aspect ratio nanoscale structures can not only retain the properties from their bulk …