Дисертації з теми "Fiber Coating"
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Culler, Adam J. "Design of a fiber coating system for physical vapor deposition." Ohio : Ohio University, 2001. http://www.ohiolink.edu/etd/view.cgi?ohiou1173811489.
Повний текст джерелаWani, Tushar Yeshwant. "Computer simulation of a fiber coating reactor." Ohio : Ohio University, 1991. http://www.ohiolink.edu/etd/view.cgi?ohiou1183988253.
Повний текст джерелаLin, Angela Sheue-Ping. "Biodegradable implants produced using fiber coating technologies." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/15927.
Повний текст джерелаPuneet, Mr. "Computer simulation of hot wall fiber coating CVD reactor." Ohio : Ohio University, 1991. http://www.ohiolink.edu/etd/view.cgi?ohiou1183736234.
Повний текст джерелаPuneet, Vashistha. "Computer simulation of hot wall fiber coating CVD reactor." Ohio University / OhioLINK, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1183736234.
Повний текст джерелаPoland, Stephan H. "Applications of optical fiber sensors with thick metal coatings." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06232009-063456/.
Повний текст джерелаDeBenedictis, Mach Austin. "Glass fiber / polypropylene prepregs produced by electrostatic fluidized bed powder fusion coating." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/11190.
Повний текст джерелаShakourian, Gelareh. "Enhanced De-inking and Recyclability of Laser Printed Paper by Plasma-Assisted Fiber Coating." Thesis, Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10572.
Повний текст джерелаDitmars, Eric D. (Eric Dennis). "The effect of rubber coating glass strands in fiber reinforced polyester composites on fracture toughness." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/17248.
Повний текст джерелаShestakov, A. F. "Telomeres of Tetrafluoroethylene - Advanced Materials to Create Superhydrophobic Coatings and Optical Fiber with Low Attenuation Coefficient." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35479.
Повний текст джерелаRichards, Regina Hardin. "The chemical vapor deposition of hexagonal aluminates as a fiber-matrix interface coating for oxide-oxide composites." Thesis, Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/18958.
Повний текст джерелаMorishita, Kohei. "Microstructure and mechanical property of SiC fiber, SiC/SiC composite and environmental barrier coating exposed in air at high temperatures." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/136188.
Повний текст джерелаHan, Ning. "Hydrogel-Electrospun Fiber Mat Composite Materials for the Neuroprosthetic Interface." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1292881087.
Повний текст джерелаDonnini, Jacopo. "STUDY OF ENHANCED FIBER REINFORCED CEMENTITIOUS MATRIX (FRCM) SYSTEMS FOR STRUCTURAL REHABILITATION." Doctoral thesis, Università Politecnica delle Marche, 2016. http://hdl.handle.net/11566/242998.
Повний текст джерелаComposites materials are continuously evolving and their use for the repair and retrofit of civil structures has become a common practice among the engineering community. Fabric Reinforced Cementitious Matrix (FRCM) system represents a new repair methodology for structural strengthening and is becoming a viable alternative to FRP, whenever the project conditions do not allow the use of organic polymer based composites. FRCM is described by the American Concrete Institute (ACI) committee 549 like a composite material consisting of a sequence of one or more layers of cement-based matrix reinforced with dry fibers in the form of open single or multiple meshes that, when adhered to concrete or masonry structural members, forms a FRCM system. FRCMs are usually constituted by dry fabrics, however, it is proved that the bond at the matrix-fibers interface is not optimal, since only the external filaments are in contact with the matrix and able to transfer the load, while the inner filaments slip due to the low friction between the fibers. This work aims to advance the FRCM state of the art in several directions and is divided in four studies. In particular, the study is devoted to characterize several FRCM systems, to clarify the differences in performance and behavior of dry and coated fabrics, to analyze the effects of high temperatures on the FRCM mechanical properties, to evaluate the effectiveness and compatibility with masonry substrates of different mortars (cementitious and geopolymeric). The purpose of First Study is to analyze how different types and amounts of organic coatings applied to a carbon bi-directional fabric could affect the bond behavior at the fiber-mortar interface and mechanical properties of the FRCM system. The effectiveness of coating treatments applied on the fabrics surface was studied by means of direct tensile, pull-off and shear-bond double-lap tests. Experimentation was carried out on different combinations of carbon fabrics and mortars, by varying the level of pre-impregnation of the fabric during the manufacturing process. In addition, the use of a quartz sand layer applied to the fabric after impregnation was investigated. Experimental evidence showed a promising enhancement of the bond between fabric and matrix and, therefore, improved performances of the entire FRCM system even with the use of low percentages of resin, depending on the type of mortar used. The purpose of Second Study is to evaluate the FRCM mechanical behavior under high-temperature conditions. Different FRCM systems were evaluated including carbon fabrics with dry or completely impregnated fibers. The experimental campaign comprised of uniaxial tensile and double-shear bond tests performed under temperatures ranging from 20°C to 120°C. Third Study explores the use of a geopolymer mortar coupled with different carbon fabrics for FRCM applications. The study included the mechanical characterization of the mortar, tensile and double-shear bond tests of the FRCM system when applied to masonry substrates. Finally, Fourth Study analyzes the bond at the FRCM to masonry substrate interface, considering the use of different inorganic primers to improve the interface bond.
Justulin, Fernando. "Desenvolvimento de sistema computacional para cálculo de trajetórias no processo de filament winding." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/18/18146/tde-13012011-155409/.
Повний текст джерелаln the search for the replacement of conventional materials by those with high structural performance, the reinforced composite materials have increasingly used by engineers during the product development process. The main reasons lies in their excellent characteristics compared to conventional materials such as: low-density associated with high stiffness and strength, good tolerance to corrosion, resistance to high temperatures and good aesthetic results. One of the manufacturing processes most used to produce composite parts is the Filament Winding. This technique consists in winding continuous impregnated fiber by a bath of resin along a mandrel. The fibers used are generally of glass or carbon, guided through a trajectory calculated by mathematical algorithms. Because of the importance of this study, this work proposes and develops a computational system to calculate the trajectories and sequences of the fiber in the Filament Winding process, considering geodesic trajectories during the hoop, helical and polar winding, which cover the majority of parts produced by this process. The routines and system are validated with the literature as well as in the CAD system.
Källgren, Rasmus. "Influence of level of cellulose oxidation and surface treatment on the adhesion between cellulose beads." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-276412.
Повний текст джерелаMed klimatfrågans växande inverkan på både politiska beslut och hur företagen utvecklar sina produkter så läggs det allt större vikt vid att hitta miljövänliga alternativ till fossilbaserade material. Ett av de mer intressanta materialen är cellulosa vilket är världens mest naturligt förekommande polymer och som kan användas i en rad olika tillämpningar. Ett sätt att modifiera fibrerna och att ändra deras egenskaper är att använda sig av en metod som kalls Layer-by-layer (LbL) behandling där två polymerer mot motsatt laddning växelvis adsorberas till fiberytan. En annan möjlighet är att oxidera cellulosan i fibrerna så att de erhåller de en högre laddning. Detta innebär dels att fibrerna kan adsorbera en högre mängd katjoniska tillsatskemikalier samt att fibrerna sväller mera vilket innebär att de plasticeras och kan skapa starkare fogar mellan fiberytorna i torrt tillstånd vilket resulterar i starkare torra fibernätverk. Vedbaserade fibrer är dock små och inhomogena såväl kemiskt som morfologiskt vilket innebär att det är nödvändigt att använda modellsystem för att kunna klarlägga, i detalj, hur behandlade och icke behandlade ytor växelverkar med varandra på en molekylär nivå. Ett modellsystem som kan användas för att undersöka hur cellulosafibrer påverkas av att beläggas med hjälp av LbL metoden är att använda sig av sfäriska kulor tillverkade från regenererad cellulosa. I föreliggande arbete behandlades dessa kulor med polyallylaminhydroklorid (PAH) och hylauronsyra (HA) samt med PAH och alginat (Alg) innan de tilläts torka ihop och därefter utsattes för dragprovning för att klarlägga adhesionen mellan ytorna. Kulorna behandlades med fem respektive tio bilager av dessa polymerer och torkades sedan ihop på en AKD-belagd yta, för att undvika adhesion till den underliggande ytan, för att undersöka adhesionen mellan kulorna. Adhesionen ökade när de behandlades med LbL och blev högre vid adsorption av flera lager polyelektrolyter och systemet med Alg/PAH resulterade i den största ökningen. Prover med tio lager av Alg/PAH testades även efter att en lösning av kalciumklorid tillsattes under torkningen vilket resulterade i en sämre adhesion mellan kulorna.
MALEKIMOGHADAM, REZA. "Study on the Mechanical Properties of Carbon Nanotube Coated‒Fiber Multi-Scale (CCFM) Hybrid Composites." Doctoral thesis, Politecnico di Torino, 2022. http://hdl.handle.net/11583/2970995.
Повний текст джерелаHofmann, Matthias Colin. "Second Order Nonlinear Silica-Based Fibers and Microspheres." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/76786.
Повний текст джерелаMaster of Science
Muradparist, Kajin. "Stretchable Barrier Coatings For Fiber-Based Materials : A laboratory study into the development of extensible/stretchable barrier coatings with nanoclay implementation, focusing on water vapour barrier properties." Thesis, Karlstads universitet, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-84939.
Повний текст джерелаSammanfattning Idag har förpackningar fått en betydande roll i matindustrin såväl som andra industrier. Vid bestrykning på förpackningar och papperssubstrat så är det vanligt med pigment- eller barriärbestrykning. Vid pigmentbestrykning så tillförs optiska egenskaper till förpackningen, såsom exempelvis förbättrad tryckbarhet. Vid barriärbestrykning tillförs huvudsakligen kemisk skydd mot exempelvis vatten, vattenånga, fetter eller gaser, och innebär för matförpackningar bland annat att hållbarheten blir längre för livsmedlet. Genom fortsatt utveckling av barriärbestrykningar på förpackningar så förväntas även förpackningens roll i samhället att bli större. I denna laborativa studie undersöks möjligheterna kring töjbara barriärer på papperssubstrat, med fokus på vattenångaresistans. De formuleringar som togs fram bestod av en latex med låg glasövergångstemperatur (Tg), kallad Soft latex med implementerad nanolera samt en latex med en Tg kallad Hard latex med implementerad nanolera. Soft latex var en Polyolefin dispersion med Tg -30°C, och Hard latex var en Styren-butadien latex med Tg = 0°C. 8 w/w% nanolera var den halt som bedömdes ge förbättringar i de mekaniska samt barriäregenskaper som eftersöktes för de båda latex. För denna studie valdes Bentonit som nanolera, på grund av dess plana samt dess fjälliga (flaky) struktur. Töjbarheten hos de framtagna barriärformuleringarna testades med töjning i dragprov först i maskin-riktning (MD) och sedan tvär-riktning (CD) samt töjning med hydroforming, med töjning på 3,8/6,7/10,4% för respektive metod. Efter töjning av respektive metod bestämdes överföringshastigheten av vattenångpermabilitet (WVTR) genom barriären. En jämförelse gjordes mellan töjning i dragprov och hydroforming för att få en ökad förståelse kring WVTR-prestationen beroende på metod av töjning. Soft latex visade en oförändrad vattenångaresistans efter 10,4%-töjning i dragprovaren. Detta tros bero på att nanoleran försvårar vattenångan att genomträngas trots töjning. Vid elektronmikroskop (SEM) kunde det ses att dispersionen av nanolera med Soft latex inte var bra, och därför var inte förbättringarna lika tydliga. Den sämre dispersionen av nanolera i matrisen beror på att Polyolefin saknar polära grupper i dess ryggrad (backbone) samt är väldigt hydrofobt, till skillnad från Bentonit som är hydrofilt. Trots sämre dispersion av nanolera och en töjning på 10,4% i MD + CD, så förbättrades vattenånga permeabiliteten (WVP).För hydroforming var prestationen av Soft latexformuleringen gällande WVTR dåliga, och vid Pinholes test fanns det uppenbara pinholes. Hard latex visade en tydlig förbättring av WVTR efter 10,4%-töjning i dragprovaren, som tros bero på en omorientering av nanoleran i polymer matrisen vid töjning, vilket kan bekräftas av elektronmikroskop (SEM) där viss omorientering är synlig. Dessutom sågs en tydlig förbättring i WVP trots en lägre barriärtjocklek.För hydroforming var WVTR-värdena liknande till endast Hard latex och 0% nanolera. Vid töjning var jämförelser beroende på de olika glasövergångstemperaturerna hos polymererna inte möjlig, och därför inte heller möjligt att konstatera ifall glasövergångstemperaturen var viktig för den förbättring som setts trots töjning i dragprovare. Men det kan hävdas att Hard latex har en mer strukturerad och stel struktur, vilket möjliggör en större grad av omorientering. Soft latex däremot, är mindre styvt och mindre ordnat, därav åstadkoms en mindre omorientering. Resultaten av denna studie är att när stretching görs i både dragprovning och hydroformning, kan 8 w/w% nanoclay (bentonit) med Hard latex (styren-butadien) vara fördelaktig i FibreForm-förpackning om töjbarhet önskas samtidigt som barriäregenskaperna mot vattenånga bibehålls.
Roy, Amit Kumar. "Atomic Layer Deposition onto Fibers." Doctoral thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-85451.
Повний текст джерелаDas Hauptziel dieser Dissertation bestand darin nachzuweisen, dass die Atomlagenabscheidung (engl. atomic layer deposition (ALD)) auf „endlose“ Fasern angewendet werden kann. Es wurde ein Reaktor zur Atomlagenabscheidung gestaltet, der speziell für die Beschichtung meterlanger Faserbündel geeignet ist. Aluminiumoxid, Titanoxid, Doppelschichten aus Aluminiumoxid und Titanoxid sowie Aluminiumphosphat wurden mit Hilfe des selbstgebauten Reaktors auf Kohlefaserbündel abgeschieden. Rasterelektronenmikroskopische (REM) und transmissionselektronenmikroskopische (TEM) Aufnahmen zeigten, dass die Beschichtung auf den Fasern einheitlich und oberflächentreu war. Des Weiteren wurde eine gute Adhäsion zwischen Beschichtung und Fasern beobachtet. Das Prinzip der Beschichtung mit Titanoxid und Aluminiumoxid mit Hilfe der ALD war bereits vorher bekannt und im Rahmen dieser Dissertation jedoch erstmals auf "endlose" Fasern angewendet. Des Weiteren wird in dieser Dissertation erstmals gezeigt, dass es möglich ist, Aluminiumphosphat mittels ALD abzuscheiden (sowohl auf planaren Oberflächen als auch auf Fasern). Aluminiumphosphat könnte von besonderem Interesse in der Faserbeschichtung sein, da es ein relativ weiches Material ist und könnte daher als eine Art „schwacher“ Verbindung zwischen Faser und Matrix in Kompositen dienen. Die Oxidationsbeständigkeit von beschichten Kohlefasern wurde im Vergleich zu unbeschichteten Fasern bis zu einem gewissen Grad erhöht. Monoschichten von Aluminiumoxid und Titanoxid waren dafür wenig effektiv. Aluminiumphosphatbeschichtete Fasern waren deutlich besser geeignet als die beiden anderen. Eine Doppelschicht aus Titanoxid gefolgt von Aluminiumoxid verbesserte die Oxidationsbeständigkeit nochmals deutlich gegenüber allen anderen Beschichtungen, die in dieser Dissertation verwendet wurden. Mikroröhren aus Aluminiumoxid, Titanoxid und Doppelschichten wurden durch die selektive Entfernung der zugrunde liegenden Kohlefasern erhalten. Einzelne Mikroröhren waren von benachbarten Röhren getrennt und sie weisen eine nahezu einheitliche Wanddicke auf
Moore, Travis J. "Application of Variation of Parameters to Solve Nonlinear Multimode Heat Transfer Problems." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4254.
Повний текст джерелаVijayakumar, Dineshwaran. "Manufacturing Carbon Nanotube Yarn Reinforced Composite Parts by 3D Printing." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1481031494735314.
Повний текст джерелаGlowania, Micheal, Oliver Weichold, Markus Hojczyk, Gunnar Seide, and Thomas Gries. "Neue Beschichtungsverfahren für PVA-Zement-Composite in textilbewehrtem Beton." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1244043027880-94266.
Повний текст джерелаGualtieri, Carlos Eduardo. "Técnicas de caracterização para avaliação das propriedades mecânicas dos revestimentos de poliuretano acrilado de fibra óptica." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-15102009-102200/.
Повний текст джерелаThe datas and information transmission in the optical fiber have been increasing in the last years. The interest to evaluate the mechanical reliability became necessary, after that a optical fiber, from a cable installed, was cracking very easily. The principal aim of this work was establishing methodologies to evaluate the polymer degradation state. Through of this techniques we search to find out parameters (E\', E\", tan δ, Tg. etc) that could denote the degradation state of the coatings. Different techniques were utilized to evaluate the coating of the optical fibers such as: differential scanning calorimeter (DSC), differential photocalorimeter (DPC), dynamic mechanic thermal analyzer (DMTA) and infrared spectroscopy (FIIR). From the method development (DMTA), it was possible to evaluate the mechanical realiability of many commercial fibers. DMTA and FTIR techniques shown to be very promising to obtain very dates to respect of polymer characteristics.
Meister, Stefan. "Functional optical coatings on fiber end faces." Berlin mbv, Mensch-und-Buch-Verl, 2008. http://d-nb.info/995879184/04.
Повний текст джерелаSatam, Sayali S. "Optimization of Wet Friction Systems Based on Rheological, Adsorption, Lubricant and Friction Material Characterization." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1503358825451407.
Повний текст джерелаPartridge, Matthew. "Fibre-optic sensors with molecular coatings." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/8028.
Повний текст джерелаInci, M. Naci. "Optical coatings for fibre optic sensors." Thesis, Heriot-Watt University, 1992. http://hdl.handle.net/10399/1455.
Повний текст джерелаSchindler, Paul M. "Corrosion detection using metal coatings on fiber optic sensors." Thesis, Virginia Polytechnic Institute and State University, 1995. http://hdl.handle.net/10919/74546.
Повний текст джерелаMaster of Science
Thammongkol, Vivan. "Electrostatic fluidized bed prepegging of carbon fiber with PEEK." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/10272.
Повний текст джерелаKugge, Christian. "Consolidation and structure of paper coating and fibre systems." Doctoral thesis, KTH, Chemistry, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3473.
Повний текст джерелаPaper coatings or coating colours are high solidssuspensions that are applied to paper to improve chieflyprintability and optical properties. A paper coatingsuspension, including pigments, binders and thickeners, is acomplex system which must be understood if the end-useproperties of paper are to be improved. Some of the importantissues that need to be addressed are the mechanisms ofmigration of latices in a drying film, the influence ofthickener on the overall consolidation and the behaviour ofpaper coatings under compression.U nderstanding theconsolidation of paper coatings is essential as the aggregatestructures formed at this stage largely determine theperformance of the paper coating.Similarly, the forming ofpaper itself from pulp fibres requires a detailed understandingof the consolidation and dewatering process.
In this thesis several approaches have been used in order tostudy the consolidation of paper coatings before and afterapplication to substrates. The techniques utilised arerheometry, centrifugation with NMR-imaging, scanning electronmicroscopy (SEM) and atomic force microscopy (AFM).Furthermore, investigations of the compressional rheology offibre systems has indicated that stepped pressure filtrationcan be a useful tool in the study of fibre dewatering.
The primary findings presented in this thesis can besummarised as follows. Studies of the compressive yield stressand rheological properties of ground calcium carbonate (GCC)suspensions indicate that the addition of a commonly usedthickener can cause flocculation, most likely of a depletiontype, which leads to more compact structures during dewatering.When applied to substrates, migration and film formation ofbinder latices in the presence of calcium carbonate pigmentsand CMC thickeners occurs concurrently and collectively. Thisis shown to influence the consolidation of the top layer of thecoating to a great extent. It was found that CMC retards themigration of latices and that ethyl(hydroxyethyl)cellulose(EHEC) adsorbs to latex and creates a composite material uponlocal film formation. The composite retains an internalhoneycomb structure in the film, that is revealed by mapping ofelastic variations using AFM phase imaging.
For fibre systems, the novel method of stepped pressurefiltration has been applied to study the compressional rheologyof pulp suspensions, and the effect of added surfactantsinvestigated. The technique is shown to be a promising tool forthe study of structure-dewatering relationships in fibresuspensions.
Jarzebinska, Renata. "Tapered optical fibre sensors employing nanostructured coatings." Thesis, Cranfield University, 2010. http://dspace.lib.cranfield.ac.uk/handle/1826/5585.
Повний текст джерелаChen, Linlin Gogotsi Yury. "Carbothermal synthesis of coatings on SiC fibers /." Philadelphia, Pa. : Drexel University, 2004. http://dspace.library.drexel.edu/handle/1860/271.
Повний текст джерелаDjurovic, Borislav. "Coating removal from fibre composites using wheat starch blast cleaning." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ29426.pdf.
Повний текст джерелаYang, Hongta. "Fundamentals, preparation, and characterization of superhydrophobic wood fiber products." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24796.
Повний текст джерелаCommittee Chair: Yulin Deng; Committee Member: Jeffery S. Hsieh; Committee Member: Sujit Banerjee; Committee Member: Zhong Lin Wang.
Tridech, Charnwit. "Smart fibre coatings stiffness control in composite structures." Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529352.
Повний текст джерелаTriantafyllidis, Zafeirios. "Structural enhancements with fibre-reinforced epoxy intumescent coatings." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/29514.
Повний текст джерелаBailleul, Carine Alice. "High-speed film forming." Thesis, Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/19129.
Повний текст джерелаYu, Liyan. "Non-linear instabilities in a thin film coating a vertical fibre." Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648789.
Повний текст джерелаGerstenhaber, Jonathan Arye. "ELECTROSPINNING ROBOT FOR REGENERATIVE COATING OF IMPLANTS." Diss., Temple University Libraries, 2017. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/480434.
Повний текст джерелаPh.D.
Electrospinning of nanofibrous mats and scaffolds enables generation of scaffolding that is not only highly porous, but also has a structure that essentially mimics the natural basement membrane. As a result, the method has proliferated extensively, and is commonly used for diverse applications such as water filtration or tissue engineering, the latter of which may involve the use of natural or synthetic materials. Common laboratory scale electrospinning setups can be built inexpensively with merely a syringe pump, a high voltage supply, and an aluminum foil target. These systems, however, are limited to flat target surface geometries that span several centimeters. While a scaffold can be cut or folded to conform to a bone or other biological surface, spinning directly onto a surface with significant peaks and troughs results in poor fiber uniformity. Furthermore, if an alteration of fiber properties is preferred, the high voltage setup limits user access and customization of parameters during the spinning period. Finally, control of the electric field is compromised by the proximity of grounded electrical components. As its first aim, this project develops a robotic control system to enable custom coatings of arbitrary surfaces. By augmenting the traditional electrospinning system with a three-dimensional robotic control system, electric field focusing fibers, and additional aerodynamic forces terms ‘electroblowing’, the device can be produced across targets with strong topographic anisotropy. The second aim continues to enhance these attributes with biocompatible soy based scaffolds. Craniofacial implants are often complex in geometry, and conformal bandages are particularly hard to produce in these areas. Soy based scaffolds will be produced for 3D-printed replicas of these situations. Finally, the methods developed across this aim enables the development and use of a handheld electrospinning system that combines a coaxial high velocity air flow with the high voltage spinning element to reduce effects of operator error. The final goal of the thesis is to test whether fiber control successfully reduces effects of fiber anisotropy in vitro and to use the enhanced fiber control mechanisms to produce scaffolds with significant anisotropy, depositing aligned fibers at a target point to eventually enable generation of scaffolds with programmable variable spatial alignment similar to tendon. When completed, the systems described will enable custom production of coatings or scaffolds for functionality as scaffolding on medically relevant surfaces. Specifically, this means first, that scaffolds can be used with confidence to improve fixation even of non-cylindrical implants and enhance local tissue integration, and second, that implants can be customized with areas of ‘guidance’ fibers or local drug depots to either promote regeneration and population by surrounding tissue or mimic natural anisotropic cues necessary for mechanical or biological functionality.
Temple University--Theses
Topliss, Stephen M. "Optical fibre long period grating sensors with nanostructured coatings." Thesis, Cranfield University, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/6799.
Повний текст джерелаMao, Joan Y. "Genetically engineered phage fibers and coatings for antibacterial applications." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/53247.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 40-42).
Multifunctionality can be imparted to protein-based fibers and coatings via either synthetic or biological approaches. Here, we demonstrate potent antimicrobial functionality of genetically engineered, phage-based fibers and fiber coatings, processed at room temperature. Facile genetic engineering of the M13 virus (bacteriophage) genome leverages the well-known antibacterial properties of silver ions to kill bacteria. Predominant expression of negatively-charged glutamic acid (E3) peptides on the pVIII major coat proteins of M13 bacteriophage (or phage) enables solution-based, electrostatic binding of silver ions and subsequent reduction to metallic silver along the phage length. Antibacterial fibers of micrometer-scale diameters are constructed from such E3-modified phage, via wet-spinning and glutaraldehyde-crosslinking of the E3-modified phage. Silverization of the free-standing fibers is confirmed via energy-dispersive spectroscopy (EDS) and inductively-coupled plasma atomic emission spectroscopy (ICP-AES), showing -0.61,pg/cm of silver on E3-Ag fibers. This degree of silverization is threefold greater than that attainable for the unmodified M13-Ag fibers. Conferred bactericidal functionality is determined via live-dead staining and a modified disk-diffusion (Kirby-Bauer) measure of zone of inhibition (Zol) against Staphylococcus epidermidis and Escherichia coli bacterial strains. Live-dead staining and Zol distance measurements indicate increased bactericidal activity in the genetically engineered virus fibers attached to silver.
(cont.) Coating of Kevlar fibers with E3 viruses exhibits antibacterial effects, as well, with relatively smaller ZoIs attributable to the lower degree of silver loading attainable in these coatings. Such antimicrobial functionality is amenable to rapid incorporation within fiber-based textiles to reduce risks of infection, biofilm formation, or odor-based detection, with the potential to exploit the additional electronic and thermal conductivity of fully silverized fibers and coatings.
by Joan Y. Mao.
S.M.
Farhan, Noor M. "Multiphase Droplet Interactions with a Single Fiber." VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/5937.
Повний текст джерелаBerg, Jolyon. "The role of fibre coatings on interphase formation in glass fibre epoxy resin composites." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245546.
Повний текст джерелаMarks, David John. "Scaling up of plasma polymer coating for interfacial control in fibre composites." Thesis, University of Sheffield, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269340.
Повний текст джерелаPrasad, Ajit. "Influence of processing variables on the mechanical properties of SiC fibers prepared by chemical vapor deposition." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/19651.
Повний текст джерелаThompson, Jonathan Ian. "The mechanical performance of adhesively bonded hydroxyapatite coatings." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245395.
Повний текст джерелаAguilar, Juan Pablo. "Experimental methodology to assess the effect of coatings on fiber properties using nanoindentation." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45781.
Повний текст джерелаWagner, Sabine. "Sensory molecularly imprinted polymer (MIP) coatings for nanoparticle- and fiber optic-based assays." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/19808.
Повний текст джерелаFor the detection of these contaminants in low concentration ranges fast and sensitive analytical tools are required. Molecularly imprinted polymers (MIPs) have been used as synthetic materials mimicking molecular recognition by natural receptors due to their ability to recognize selectively a wide range of analytes, their stability and ease of synthesis. They have gained more and more attention in chemical sensing as receptor material for the detection of suitable groups of analytes at low concentrations especially in combination with fluorescence due to the latter’s high sensitivity. This work aimed the development of optical sensor materials using MIPs as recognition elements connected with fluorescence for the sensitive detection of herbicides and antibiotics in water and food samples and their combination with various device formats for the future detection of a wide range of analytes.
Yamin, Inbar (Inbar S. ). "The role of self-healing coatings on soft polymer fibers." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98556.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (page 32).
Mussel byssal threads exhibit unique self-healing mechanical properties. This study designed a synthetic system modeled after the byssal thread structure in order to isolate the origins of their unique self-healing mechanical properties. PDMS fibers were coated with metal-coordination bonds crosslinked PEG gels and their mechanical properties were tested with uniaxial tension tests. The synthetic system achieved a similar behavior to that of the natural mussel fibers, showing that a thin stiff coating on a soft polymer fiber can have a dramatic effect on its mechanical behavior. The coated fibers were much stiffer at small strains than the uncoated PDMS. The linear elastic region was followed by a distinct yield stress, which indicated the coating beginning to fracture. At high strains, when the coating had failed catastrophically, the PDMS behavior dominated. The coatings were healed though hydration in a humid environment and were then able to recover their stiffness similar to mussel byssal threads.
by Inbar Yamin.
S.B.