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Dissertations / Theses on the topic 'Stretchable materials'

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1

Texidó, Bartes Robert. "Novel electronic stretchable materials for future medical devices." Doctoral thesis, Universitat Ramon Llull, 2017. http://hdl.handle.net/10803/402945.

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L’electrònica convencional basada en el silici te grans dificultats a l’hora de ser implementada en dispositius electrònics que estiguin en contacte amb les corbes i las plasticitat dels teixits del cos humà. Futures aplicacions mèdiques como la pell electrònica, sistemes de alliberació de fàrmac transdèrmic o nous bio-sensors requereixen de sistemes electrònics capaços de ser doblegats, retorçats o enrotllats en superfícies corbes. Tot i els prometedors resultats mostrats por la investigació en electrònica flexible, no hi ha aplicacions comercials directes dins de l’àrea mèdica. La dependènc
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2

Khakalo, Alexey, Jarmo Kouko, Elias Retulainen, and Orlando J. Rojas. "Super-stretchable paper-based materials for 3D forming." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-236369.

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Paper is renewable, recyclable, sustainable and biodegradable material and, as a result, paper-based materials are widely used in the world packaging market. However, paper-based materials cannot compete with plastics in terms of processability into various 3D shapes. This is due to poor formability of paper, which is closely associated with its toughness. To improve paper formability, we report on a facile and green method that combines fiber and paper mechanical modifications at different structural levels as well as biopolymer treatment via spraying. As a result, a remarkable elongation of
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3

BELLACICCA, ANDREA. "SMART MATERIALS FOR STRETCHABLE ELECTRONICS, SENSORS AND SOFT ACTUATION." Doctoral thesis, Università degli Studi di Milano, 2017. http://hdl.handle.net/2434/476724.

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Smart materials can be exploited to facilitate disruptive or transformative changes in several fields like stretchable electronics, soft robotics or to develop new class of sensors. They are innovative materials that interact with the environment and respond to external stimuli altering their physical properties in a controlled fashion. They are made integrating different materials at the nanoscale in a nanocomposite to obtain novel functionalities that are not showed from individual constituents. Polymers are the best candidates to be used in smart material fabrication because of their struc
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4

Melzer, Michael. "Stretchable Magnetoelectronics." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-191026.

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In this work, stretchable magnetic sensorics is successfully established by combining metallic thin films revealing a giant magnetoresistance effect with elastomeric materials. Stretchability of the magnetic nanomembranes is achieved by specific morphologic features (e.g. wrinkles), which accommodate the applied tensile deformation while maintaining the electrical and magnetic integrity of the sensor device. The entire development, from the demonstration of the world-wide first elastically stretchable magnetic sensor to the realization of a technology platform for robust, ready-to-use elastic
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5

Engman, Alexander. "Development and 3D Printing of Intrinsically Stretchable Materials for Microsupercapacitors." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-284517.

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The purpose of this thesis is to develop a simple Direct Ink Writing (DIW) method for fabricating intrinsically stretchable microsupercapacitors as ef- fective on-chip energy storage devices for the emerging stretchable electron- ics. Using the printing method for fabricating intrinsically stretchable elec- tronic components remains a novel approach. In this thesis, interdigitated structures of intrinsically stretchable electrodes were printed on a stretchable thermoplastic polyurethane (TPU) substrate using a formulated ink based on Poly(3,4-ethylenedioxythiophene):Polystyrene Sulfonate. Form
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6

Vatani, Morteza. "Additive Manufacturing of Stretchable Tactile Sensors: Processes, Materials, and Applications." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1436202948.

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7

Tolvanen, J. (Jarkko). "Novel sensor and switch applications for flexible and stretchable electronic materials." Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526220864.

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Abstract In this thesis flexible electronics composite materials were developed and utilized in pressure sensors. Additionally, stretchable materials based on piezoresistive structures were fabricated and their feasibility for printed electronics switches and stretchable strain sensors was investigated. In the first part of the thesis two types of composite materials were developed based on polyurethane foam with added carbon powder and on liquid crystal polymer with ceramic powder. The first developed composite was utilized in piezoresistive and capacitive hybrid sensors and the latter one fo
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8

Yao, Shulong. "Highly Stretchable Miniature Strain Sensor for Large Dynamic Strain Measurement." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849674/.

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This thesis aims to develop a new type of highly stretchable strain sensor to measure large deformation of a specimen subjected to dynamic loading. The sensor was based on the piezo-resistive response of carbon nanotube(CNT)/polydimethysiloxane (PDMS) composites thin films, some nickel particles were added into the sensor composite to improve the sensor performance. The piezo-resistive response of CNT composite gives high frequency response in strain measurement, while the ultra-soft PDMS matrix provides high flexibility and ductility for large strain measuring large strain (up to 26%) with an
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9

Agar, Joshua Carl. "Highly conductive stretchable electrically conductive composites for electronic and radio frequency devices." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/44875.

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The electronics industry is shifting its emphasis from reducing transistor size and operational frequency to increasing device integration, reducing form factor and increasing the interface of electronics with their surroundings. This new emphasis has created increased demands on the electronic package. To accomplish the goals to increase device integration and interfaces will undoubtedly require new materials with increased functionality both electrically and mechanically. This thesis focuses on developing new interconnect and printable conductive materials capable of providing power, ground
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10

Arcovitch, Cory Michael. "Fabrication And Thermoelectric Characterization Of Stretchable Conductive Latex-Based Composites." ScholarWorks @ UVM, 2017. http://scholarworks.uvm.edu/graddis/712.

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Miniaturized stretchable electronic devices that can be bent and strained elastically without breaking, have drawn considerable research interest in recent years for wearable computers and integrated bio-sensor applications. Portable electrical power harvesting remains a critical challenge in flexible electronics materials. One proposed solution has been to convert waste heat from the human body into electricity using thermoelectric materials. Traditionally, however, these materials are brittle ceramic semiconductors with limited fracture resistance under deformation. The primary objective of
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11

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.

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Executive summary Today, packaging has gained a significant role in the food industry as well as other industries. Paper substrates that have been coated in some ways are typically used to make packaging. The amount and type of pigment used in the formulation determine whether this coating is a pigment coating or a barrier coating. Critical pigment volume concentration (CPVC) is the optimum spot when the pigments are packed as densely as possible, and the binder fills the air gaps. When the amount of pigment in a coating is less than CPVC, a barrier coating is formed, although when the amount
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12

Shelton, Travis Edward. "Synthesis and Characterization of Crystalline Transition Metal Dichalcogenides onto Stretchable Substrates by Laser Processing." University of Dayton / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1450405970.

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13

Ghosh, Souvik. "ATMOSPHERIC-PRESSURE in situ PLASMA REDUCTION AND PATTERNING OF METAL-ION CONTAINING POLYMERS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1490872201148598.

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14

Naserifar, Naser. "Material Gradients in Thin Stretchable Substrates for Wearable Electronics." Research Showcase @ CMU, 2016. http://repository.cmu.edu/dissertations/758.

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Stretchable electronics garners attention for its promise in unobtrusive wearable systems for health monitoring and potentially for medical therapy. One significant question though is whether to develop holistic stretchable electronics where the process steps for electronic and mechanical functions are interwoven, or to integrate mature CMOS into stretchable electronic substrates where the CMOS process is separate from mechanical process steps. A major limitation with integrating CMOS is the interface between the soft and hard materials when introduced into functional systems. To address this,
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15

Hockings, Nicholas. "Material and mechanical emulation of the human hand." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.720651.

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The hands and feet account for half of the complexity of the musculoskeletal system, while the skin of the hand is specialised with many important structures. Much of the subtlety of the mechanism of the hand lies in the soft tissues, and the tactile and proprioceptive sensitivity depends on the large number of mechanoreceptors embedded in specific structures of the soft tissues. This thesis investigates synthetic materials and manufacturing techniques to enable building robots that reproduce the biomechanics and tactile sensitivity of vertebrates – histomimetic robotics. The material and mech
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16

Iglesias, Sophie. "Composites conducteurs polymères hautement déformables pour la récupération d’énergie houlomotrice." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI034/document.

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Ces travaux de thèse ont porté sur l’élaboration d’électrodes déformables pour la récupération d’énergie houlomotrice. En effet, la conversion de l’énergie mécanique des vagues en électricité est possible via un système entièrement souple et basé sur la technologie des polymères électroactifs (ou EAP). Ces matériaux ont la capacité de se déformer sous stimuli électrique, d’où la nécessité de développer des matériaux conducteurs déformables. Le matériau EAP choisi pour l’étude est un élastomère silicone. La formulation de composites à matrice élastomère silicone chargée en particules conductric
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17

Al-Milaji, Karam Nashwan. "Material Interactions and Self-Assembly in Inkjet Printing." VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/6053.

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Inkjet printing has attracted much attention in recent years as a versatile manufacturing tool, suitable for printing functional materials. This facile, low-cost printing technique with high throughput and accuracy is considered promising for a wide range of applications including but not limited to optical and electronic devices, sensors, solar cells, biochips, and displays. The performance of such functional devices is significantly influenced by the deposit morphology and printing resolution. Therefore, fabrication functional devices with precise footprints by inkjet printing requires deep
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18

"Fundamentals of Soft, Stretchable Heat Exchanger Design." Doctoral diss., 2020. http://hdl.handle.net/2286/R.I.63012.

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abstract: Deformable heat exchangers could provide a multitude of previously untapped advantages ranging from adaptable performance via macroscale, dynamic shape change (akin to dilation/constriction seen in blood vessels) to enhanced heat transfer at thermal interfaces through microscale, surface deformations. So far, making deformable, ‘soft heat exchangers’ (SHXs) has been limited by the low thermal conductivity of materials with suitable mechanical properties. The recent introduction of liquid-metal embedded elastomers by Bartlett et al1 has addressed this need. Specifically, by remaining
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19

Yu-LunHuang and 黃鈺倫. "Fabrication of Silver Nanowires/Carbon Nanotubes for Stretchable Electrode Materials." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/g5vf5q.

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20

Dauzon, Emilie. "Flexible and stretchable organic materials and devices for application in emerging optoelectronics." Diss., 2020. http://hdl.handle.net/10754/666230.

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New technologies will require more and more compliant materials capable of conforming to curved surfaces, i.e., able to stretch and mechanically resist body motions for wearable and on-skin applications. In this regard, this work discusses strategies to induce stretchability in materials. We focused our attention on improving the elasticity of transparent conducting electrodes (TCE) based on PEDOT:PSS and semiconductors (active layer) for organic solar cells. Firstly, the introduction of DMSO and Zonyl as additives into PEDOT:PSS was shown to produce highly transparent conducting electrode
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21

Damdam, Asrar N. "Reconfigurable Electronics Platform: Concept, Mechanics, Materials and Process." Thesis, 2018. http://hdl.handle.net/10754/628254.

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Electronic platforms that are able to re-shape and assume different geometries are attractive for the advancing biomedical technologies, where the re-shaping feature increases the adaptability and compliance of the electronic platform to the human body. In this thesis, we present a serpentine-honeycomb reconfigurable electronic platform that has the ability to reconfigure into five different geometries: quatrefoil, ellipse, diamond, star and one irregular geometry. We show the fabrication processes of the serpentine-honeycomb reconfigurable platform in a micro-scale, using amorphous silicon, a
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22

(8787839), Raymond Adam Bilodeau. "Designing Multifunctional Material Systems for Soft Robotic Components." Thesis, 2020.

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<p>By using flexible and stretchable materials in place of fixed components, soft robots can materially adapt or change to their environment, providing built-in safeties for robotic operation around humans or fragile, delicate objects. And yet, building a robot out of only soft and flexible materials can be a significant challenge depending on the tasks that the robot needs to perform, for example if the robot were to need to exert higher forces (even temporarily) or self-report its current state (as it deforms unexpectedly around external objects). Thus, the appeal of multifunctional material
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23

"Synthesis of Highly Conductive Stretchable Interconnect with Polymer Composite and its Evaluation Against Market-Available Materials." Master's thesis, 2020. http://hdl.handle.net/2286/R.I.62816.

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abstract: Flexible conducting materials have been in the forefront of a rapidly transforming electronics industry, focusing on wearable devices for a variety of applications in recent times. Over the past few decades, bulky, rigid devices have been replaced with a surging demand for thin, flexible, light weight, ultra-portable yet high performance electronics. The interconnects available in the market today only satisfy a few of the desirable characteristics, making it necessary to compromise one feature over another. In this thesis, a method to prepare a thin, flexible, and stretchable inter-
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24

Lin, Zhi-Yu, and 林志宇. "Highly Stretchable Thermal Interface Materials via Ball Milled Graphene Platelets and Application to Thermal Management of High Power Electronic Devices." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/48209074410325786285.

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碩士<br>國立中央大學<br>機械工程學系<br>105<br>Thermal interface materials (TIMs) is a key component in the majority of power electronic systems. Heat, generated by the semiconductors, has to be transferred to a heat sink and finally dissipated to ambient. In this work, we report a versatile and solvent-free method for the particle size reduced of exfoliated graphite nanoplatelets (EGN) into high-quality ball-milled exfoliated graphite nanoplatelets (BMEGN) by simple solid-state ball-milling, fillers are embedded and thermally cured with Polydimethylsiloxane (PDMS) to make a highly stretchable BMEGN-embedde
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Negrão, Luís Filipe Moreira Simões de Oliveira. "Silver-based Soft Electronic Systems: Materials and Fabrication Methods." Master's thesis, 2018. http://hdl.handle.net/10316/86185.

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Dissertação de Mestrado Integrado em Engenharia Física apresentada à Faculdade de Ciências e Tecnologia<br>Este trabalho incide sobre sistemas eletrónicos extensíveis (\textit{Stretchable}) fabricados com compostos condutores constituídos por micropartículas/microflocos de prata dispersos numa matriz de Polidimetilsiloxano.Num primeiro passo, vários tipos de compostos baseados em prata serão testados e comparados. Isto inclui partículas com diferentes geometrias, nomeadamente micropartículas e microflocos de prata, bem como micropartículas de níquel e ferrite revestidas com prata. Do composto
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26

"Gallium-Based Room Temperature Liquid Metals and its Application to Single Channel Two-Liquid Hyperelastic Capacitive Strain Sensors." Master's thesis, 2015. http://hdl.handle.net/2286/R.I.29675.

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abstract: Gallium-based liquid metals are of interest for a variety of applications including flexible electronics, soft robotics, and biomedical devices. Still, nano- to microscale device fabrication with these materials is challenging because of their strong adhesion to a majority of substrates. This unusual high adhesion is attributed to the formation of a thin oxide shell; however, its role in the adhesion process has not yet been established. In the first part of the thesis, we described a multiscale study aiming at understanding the fundamental mechanisms governing wetting and adhesion o
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27

"Study on Buckling of Stiff Thin Films on Soft Substrates as Functional Materials." Doctoral diss., 2014. http://hdl.handle.net/2286/R.I.24814.

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abstract: In engineering, buckling is mechanical instability of walls or columns under compression and usually is a problem that engineers try to prevent. In everyday life buckles (wrinkles) on different substrates are ubiquitous -- from human skin to a rotten apple they are a commonly observed phenomenon. It seems that buckles with macroscopic wavelengths are not technologically useful; over the past decade or so, however, thanks to the widespread availability of soft polymers and silicone materials micro-buckles with wavelengths in submicron to micron scale have received increasing attention
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28

Fu, Tzu-Hsiang, and 傅咨翔. "Stretchable nanocarbon material hybrids film and heater application." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/27626g.

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碩士<br>國立臺灣科技大學<br>材料科學與工程系<br>107<br>In recent years, the development of electrothermal textiles has received a lot of attention, and the combination of textile and heating elements has become the focus of research in the field of smart textiles. Warm textiles are based on textile materials, which make the textile yarn itself have the function of heating and heat preservation. Generally, the electrothermal product system commonly used in the market is mainly composed of carbon fiber, electric heating wire, etc., and further contains a high-purity nickel-based alloy. However, many problems of e
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29

Gomes, Sérgio Miguel Barbosa dos Santos. "Low cost stretchable thin film electroluminescent devices for display applications." Master's thesis, 2018. http://hdl.handle.net/10362/56429.

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Recent advances in materials science research have enabled the production of highly stretchable devices like sensors and displays. This new field of stretchable electronics stem from strain engineering and nanocomposite approaches, which require expensive production methods and result in fragile devices. The emerging materials group at TU Delft Industrial Design Engineering Department large interest on expandable and stretchable light emitting devices culminated on this work where it was found a method to obtain stretchable electroluminescent devices for application on simple electrolumi
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