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Dissertations / Theses on the topic 'Hydrogels composites'

Author: Grafiati
Published: 25 May 2024
Last updated: 31 July 2025

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1

Lizardo, Daniel (Daniel H. ). "Architectural scale biomimetic composites based on chitosan and alginate hydrogels." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98654.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Materials Science and Engineering, June 2015.<br>Cataloged from PDF version of thesis. "May 2015."<br>Includes bibliographical references (pages 44-46).<br>Developmental research and characterization was conducted on novel biomaterials for a larger project of product and architectural scale digital fabrication using natural bioplastics and hierarchical computational design carried out by the Mediated Matter team, led by Laia Mogas-Soldevila and Jorge Duro-Royo. Chitosan and alginate (among other natural polymers) are processed
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2

Roellinger, Bettina. "De nouveaux hydrogels composites pour la production et le stockage énergétique." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLET053.

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Les hydrogels sont des matériaux poreux visco-élastiques formés d'un réseau tridimensionnel généralement de polymères capables d'absorber une grande quantité d'eau. Du fait de leurs propriétés, on les utilise principalement dans l'industrie pharmaceutique, agroalimentaire et dans le domaine des biotechnologies. Au cours de cette thèse, nous proposons d’ouvrir une voie encore peu exploitée qui est l’intégration des hydrogels pour le stockage et la production d’énergie. Dans un premier temps, les étapes qui ont conduit à la formulation ainsi qu’à la caractérisation physico-chimique d’une électro
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3

Samchenko, Yu M., S. O. Kryklia, T. P. Poltoratska, et al. "Hybrid Hydrogel Materials with Incorporated Nanoparticles." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35464.

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Synthesis and physico-chemical studies of new promising hybrid hydrogels based on polyvinyl alcohol (PVA) acetales and copolymer hydrogels based on vynil monomers have been studied. Acrylamide and Acrylnitrile were used as some of components that carry various fillers . Sponge acetales of polyvinyl alco-hol were used as enforcing net. The synthesized composites demonstrated high strength as compared to standard hydrogels- Yung-module varied in the range of 80 to 300 kPa depending on the extent of PVA ac-etale matrix filling with hydrogel component. The materials showed high sorbability to wate
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4

Marcasuzaa, Pierre. "Composites conducteurs à base de PANI : vers une architecture contrôlée de 2D à 3D." Pau, 2009. http://www.theses.fr/2009PAUU3047.

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Les polymères intrinsèquement conducteurs (PIC) sont une catégorie de matériaux qui connaissent actuellement un important essor. Cependant, leur principal inconvénient est leur insolubilité dans les solvants usuels. C’est pour cela que de nombreuses études les associent avec des matrices polymère pour former des composites. Lors de cette étude, nous avons synthétisé des copolymères à blocs conducteurs dont la structure chimique est contrôlée. Ces copolymères sont composés d’un bloc "matrice" et d’un second bloc conducteur. La première partie, polystyrène ou polyacrylate, est synthétisée par po
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Frayssinet, Antoine. "Hydrogels composites collagène/acide hyaluronique cellularisés et biomimétiques pour la régénération du Nucleus Pulposus." Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS312.

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50 % des douleurs dorsales chroniques sont associées à une dégénérescence du disque intervertébral (IVD). Nous avons émis l'hypothèse qu'un hydrogel biomimétique favoriserait la régénération du Nucleus Pulposus, la partie centrale de l’IVD, en fournissant des signaux physiques adéquats à des cellules souches mésenchymateuses (MSC) pour se différencier en nucléopulpocytes. Avec des teneurs différentes en acide hyaluronique fonctionnalisé (HA-Tyr), des hydrogels composites Collagène/HA-Tyr ont été synthétisés et caractérisés par microscopies électroniques à balayage et à transmission, rhéologie,
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Mushi, Ngesa Ezekiel. "Chitin nanofibers, networks and composites : Preparation, structure and mechanical properties." Doctoral thesis, KTH, Biokompositer, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-155528.

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Chitin is an important reinforcing component in load-bearing structures in many organisms such as insects and crustaceans (i.e. shrimps, lobsters, crabs etc.). It is of increasing interest for use in packaging materials as well as in biomedical applications. Furthermore, biological materials may inspire the development of new man-made material concepts. Chitinmolecules are crystallized in extended chain conformations to form nanoscale fibrils of about 3 nm in diameter. In the present study, novel materialshave been developed based on a new type of chitin nanofibers prepared from the lobster ex
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7

Kryklia, S. O., Yu M. Samchenko, N. O. Pasmurtseva, V. V. Konovalova, and S. M. Scherbakov. "Nano-Sized Hydrogel Composites Based on N-Isopropylacrylamide and Magnetite for Controlled Drug Delivery." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42510.

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Synthesis and characterization studies of promising nano-sized hydrogel composites based on nisopropylacrylamide and magnetite have been studied. N-isopropylacrylamide (NIPA) gel component was used as a carrier of various drugs, magnetite was used as a magneto-responsive component. Presence of magnetite it was proved by EPR method. Composite nanoparticles were characterized by electron microscopy (TEM) and by dynamyc light scattering (DLS) method. It was shown that the average size of nanoparticles is 50 or 100 nm, depending on the method of preparation. The hydrogel is characterized by clear
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8

Knudsen, Bernard. "A Rheological Examination of Polymer Composites: Including Functionalized Carbon Nanotubes, Viable Polyurethane Alternates, and Contact Lens Hydrogels." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4522.

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From medicine to aerospace, innovation in multiple fields will not occur without addressing current questions that still exist in polymer behavior and manipulation. This dissertation represents the research carried out over the course of three separate experiments using rheometry as the key technique to explore the behavior of polymer composites. In all three studies, polymer composites were investigated for changes to their known physical properties caused through the addition of a filler or functionalization. Chapter Two examines the possibility of enhancing poly(4-methyl-1-pentene) throug
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9

Hawkins, Ashley Marie. "BIODEGRADABLE HYDROGELS AND NANOCOMPOSITE POLYMERS: SYNTHESIS AND CHARACTERIZATION FOR BIOMEDICAL APPLICATIONS." UKnowledge, 2012. http://uknowledge.uky.edu/cme_etds/10.

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Hydrogels are popular materials for biological applications since they exhibit properties like that of natural soft tissue and have tunable properties. Biodegradable hydrogels provide an added advantage in that they degrade in an aqueous environment thereby avoiding the need for removal after the useful lifetime. In this work, we investigated poly(β-amino ester) (PBAE) biodegradable hydrogel systems. To begin, the factors affecting the macromer synthesis procedure were studied to optimize the reproducibility of the resulting hydrogels made and create new methods of tuning the properties. Hydro
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Butcher, Annabel Louise. "Deformation and fracture of soft materials for cartilage tissue engineering." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/277890.

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Damaged cartilage can cause severe pain and restricted mobility, with few long term treatments available. The developing field of tissue engineering offers an alternative to the currently used full joint replacement. Restoring damaged cartilage through tissue engineering would enable an active lifestyle to be recovered and retained, without restrictions to joint mobility. This is increasingly important as the prevalence of osteoarthritis rises. Tissue engineering requires biomaterial scaffolds that mimic the function of the tissue while cells develop, and so the scaffold must provide the appro
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11

Wang, Chunhua, C. Mu, and W. Lin. "A Novel Microspheres Composite Hydrogels Cross-linked by Methacrylated Gelatin Nanoparticles - 45: Enhanced Mechanical Property and Biocompatibility." Verein für Gerberei-Chemie und -Technik e. V, 2019. https://slub.qucosa.de/id/qucosa%3A34268.

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Content: Nowadays, protein-based nanoparticle as a biodegradable, biocompatible product attracts considerable interest for new uses in specialized technical areas. Gelatin is a denatured, biodegradable, and nonimmunogenic protein obtained by controlled hydrolysis of the triple-helix structure of collagen into single-strain molecules. As an amphiphilic biopolymer, gelatin can easily assemble into different kinds of aggregates under the defined pH and temperature and the resulting gelatin nanoparticles have been developed to be applied in the food industry and biomedical fields. Herein we report
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12

Bas, Onur. "Deterministic design & additive biomanufacturing of biomimetic soft network composites for tissue engineering applications." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/116584/10/Onur_Bas_Thesis.pdf.

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Design strategies inspired by nature open up new avenues in materials design and facilitate the development of innovative materials outperforming their conventionally engineered counterparts. In this thesis, bioinspired design principles based on the physicochemical and morphological properties of soft biological materials were used to develop functional soft network composites (SNCs) intended for soft tissue engineering applications. These SNCs consist of a network of 3D printed microfibres and a hydrogel matrix mimicking the collagens and proteoglycans present in native extracellular matrice
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13

Santana, Genelane Cruz. "Caracterização e viabilidade do uso de hidrogéis compósitos poli (álcoolvinílico)/atapulgita em sistemas de liberação de fármaco." Universidade Federal de Sergipe, 2012. https://ri.ufs.br/handle/riufs/3521.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Composites hydrogels were developed in film shape based on poly vinyl alcohol (PVA) using acidified attapulgite as crosslinking agent. The hydrogel composites were obtained in solution with amounts of attapulgite ranging from 0.05 to 2% in the polymer matrix in order to study its influence on the crystallinity, in the swelling properties and in the release of gentamicin sulphate. The obtained composites were characterized by XRD, FTIR and DSC. According to XRD data the polymer crystallinity is not affected by the clay addition, how
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14

Jordan, Alex Michael. "FIBER-COMPOSITE IN SITU FABRICATION: MULTILAYER COEXTRUSION AS AN ENABLING TECHNOLOGY." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1467832877.

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15

Strange, Daniel Geoffrey Tyler. "Mechanics of biomimetic materials for tissue engineering of the intervertebral disc." Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/244660.

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Tissue engineering offers a paradigm shift in the treatment of back pain. Engineered intervertebral discs could replace degenerated tissue and overcome the limitations of current treatments that disrupt the biomechanics of the spine. New materials, which exhibit sophisticated mechanical responses, are needed to provide templates for tissue regeneration. These behaviours include time-dependent deformation---facilitating shock absorption and nutrient transfer---and strong material anisotropy and tensile-compressive nonlinearities---providing flexibility in controlled directions. In this work, fr
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16

Roux, Rémi. "Élaboration d'assemblages colloïdaux à partir de nanoparticules de poly(acide lactique) et de chitosane." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10088/document.

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Les assemblages colloïdaux représentent une nouvelle piste très prometteuse dans le domaine de l'ingénierie tissulaire. Idéalement, ce type d'assemblage permet l'obtention de matériaux injectables et gélifiants sur le site lésionnel, favorisant par la suite le développement de néo-tissus viables. Ce travail porte sur la formation de tels assemblages à base de chitosane et de poly(acide lactique) (PLA). Deux types d'assemblages ont été conçus et étudiés dans ce travail. Dans une première approche, le mélange de particules anioniques de poly (acide lactique) (PLA) avec du chitosane en solution f
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17

Kosto, Kimberly Bryan 1977. "Hindered transport in composite hydrogels." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28358.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2004.<br>Includes bibliographical references (leaves 143-152).<br>The ultimate goal of this research was to develop a greater understanding of the structural components needed to describe transport within the glomerular basement membrane (GBM). Specifically, dimensionless diffusive and convective hindrance factors were investigated by measuring macromolecular permeability through synthetic, two-fiber, agarose-dextran hydrogels at very small or very high Pe, respectively. By comparing diffusion and convection
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Desorme, Mylène. "Filage du chitosane pour l’élaboration de textiles biomédicaux innovants." Thesis, Lyon 1, 2011. http://www.theses.fr/2011LYO10112.

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Ce travail concerne le développement de nouvelles méthodes de filage du chitosane ainsi que l’étude des propriétés morphologiques, mécaniques et biologiques des fibres obtenues, en vue de leur utilisation sous forme de fils et textiles dans des applications biomédicales (en particulier, la constitution de prothèses pariétales pour la chirurgie viscérale et de pansements pour le traitement des plaies chroniques). Les monofilaments sont élaborés à partir de solutions hydroalcooliques de chitosane. Les deux procédés décrits sont basés sur la gélification physique du polymère sans utiliser d’agent
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Binti, Adrus Nadia [Verfasser], Mathias [Akademischer Betreuer] Ulbricht, and Christian [Akademischer Betreuer] Mayer. "Stimuli-Responsive Hydrogels and Hydrogel Pore-Filled Composite Membranes / Nadia Adrus. Gutachter: Christian Mayer. Betreuer: Mathias Ulbricht." Duisburg, 2012. http://d-nb.info/1021899720/34.

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20

Perez, Edward Peña. "Bilayer composite hydrogels for corneal prostheses." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11786.

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Belda, Marín Cristina. "Silk bionanocomposites : design, characterization and potential applications." Thesis, Compiègne, 2020. http://www.theses.fr/2020COMP2570.

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Les « bionanocomposites » à base de soie sont des matériaux qui suscitent un intérêt croissant dans de nombreuses applications, et en particulier dans le domaine biomédical, de par leur capacité à combiner les propriétés de la fibroïne (biodégradabilité, biocompatibilité et propriétés mécaniques intéressantes) et celles des nanoparticules (NP). L’objectif de ce travail est de (i) développer une méthode efficace, et « facile » à mettre en oeuvre, permettant l’élaboration de plusieurs types de bionanocomposites de soie ; (ii) fournir une caractérisation approfondie pour une meilleure compréhensi
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Yang, Xianpeng. "Strong Cellulose Nanofiber Composite Hydrogels via Interface Tailoring." Kyoto University, 2020. http://hdl.handle.net/2433/253333.

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Holdforth, Rachel Katherine. "Conductive carbon nanotube-hydrogel composites for nerve repair." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609184.

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Kianbakhsh, Pejman. "Recycling polymer composite hydrogen pressure vessels." Thesis, University of Nottingham, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546472.

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By 2002 the world market for polymer composites was 7.2 Million Tons. The automotive and industrial vehicle industry consumes 25% of the world's composite material output. Composite materials benefit the automotive industry in multiple ways. Regulatory pressure that encourages recyclablity and reduction of energy consumption pushes automotive manufacturers to consider new technologies to meet these environmental standards. The work being undertaken in this research is part of an ED integrated Project under the "Sixth Framework of Research and Development Funding". The project title is "Hydroge
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Shi, Guoqiang. "Preparation and properties of polymeric bacteriostatic composite hydrogel." Магістерська робота, Kyiv National University of Technology and Design, 2021. https://er.knutd.edu.ua/handle/123456789/19545.

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The master's thesis is devoted to developing and preparing a composite hydrogel material that can meet the long-term antibacterial properties through a simple physical cross-linking method. The specific research content is as follows: Using PVA and PHMG as raw materials, without introducing initiator and cross-linking agent, through the freezing-thawing method, an antibacterial hydrogel material was prepared. By controlling the PHMG content, freezing time, the number of freeze-thaw cycles and other conditions, the performance of the hydrogel can be adjusted. The best formulation of the hydroge
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Mottet, Léopold. "Hydrogel composite conducteur pour l'encapsulation de bactéries électroactives." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066583/document.

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Ce travail de thèse est principalement axé sur la création d'un nouveau réacteur biocompatible permettant l'encapsulation et l'étude de bactéries électroactives. Ce compartiment de taille millimétrique, réalisé par coextrusion, est une capsule à coeur liquide possédant une membrane d'hydrogel conducteur. La synthèse de ce bioréacteur a nécessité la formulation d'un hydrogel composite alginate/nanotubes de carbone en deux étapes. Une première étape rapide crée la matrice d'hydrogel par diffusion d'ions divalents dans un mélange Alginate/nanotubes de carbone. Une seconde étape, plus lente, perme
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Nwakwuo, Christopher Chinedu. "Reactive hydride composites for efficient hydrogen energy storage." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:8a3e1081-8655-41db-b1c0-8986658371a1.

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Solid state chemical storage of hydrogen in metals offers promising advantages over compressed hydrogen gas and condensed liquid hydrogen, especially for mobile applications with respect to safety and energy efficiency. However, no single metal hydride simultaneously satisfies the essential performance criteria for onboard hydrogen storage namely, high gravimetric and/or volumetric energy density, fast kinetics and favorable thermodynamics. Recently, a breakthrough achievement was made by the development of reactive hydride composites in which two metal hydride systems (e.g. NaBH<sub>4</sub> a
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Ehrenhofer, Adrian, and Thomas Wallmersperger. "Active hydrogel composite membranes for the analysis of cell size distributions." SPIE, 2019. https://tud.qucosa.de/id/qucosa%3A74237.

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Active membranes with switchable pores that are based on hydrogels can be used to measure the cell size distribution in blood samples. The system investigated in the present research is based on a polyethylene terephthalate (PET) membrane that is surface polymerized with poly (N-isopropyl acrylamide) (PNiPAAm) to form active pores of arbitrary geometry. The PET membrane provides the functionality of a backbone for mechanical rigidity, while the soft PNiPAAm hydrogel forms the active pores. Modeling and simulation of the active hydrogel behavior proved to adequately predict the opening and clos
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Thèvenot, Caroline. "Synthèses, caractérisations et propriétés électrostimulables d'hydrogels composites polyacrylamide-nanoparticules de polystyrène/polyaniline." Pau, 2006. http://www.theses.fr/2006PAUU3028.

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De nouveaux matériaux adaptatifs, des hydrogels composites (HC) électrostimulables ont été élaborés. Ils sont composés d'un réseau de poly(acrylamide) réticulé par du N-N'méthylènebisacrylamide (BisAM) emprisonnant deux types de nanoparticules : (i) de polystyrène (PS) réticulé, (ii) cœur-écorce (CS) constituées d'un cœur de PS et d'une couronne de polymère intrinsèquement conducteur (polyaniline). Ces nanoparticules ont été synthétisées par polymérisation radicalaire en dispersion puis caractérisées. Elles sont de composition et de taille bien définies (400 à 450 nm). La synthèse des HC a été
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Li, Chao. "Synthesis and evaluation of porous composite hydrogels for tissue engineering applications." Thesis, Curtin University, 2012. http://hdl.handle.net/20.500.11937/1388.

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The purpose of this dissertation was to synthesize and evaluate porous poly(2- hydroxyethyl methacrylate) (PHEMA) and PHEMA composite hydrogels containing various concentrations of titanium dioxide (TiO2) nanoparticles, silicon dioxide (SiO2) nanoparticles, and multi-walled carbon nanotubes (CNTs) for tissue engineering applications. Eighteen PHEMA nanocomposite hydrogels and five control PHEMA hydrogels were prepared in varying concentrations of water (60-90 wt.%) via a free radical polymerization process. Four of these hydrogels were modified further with an OVICOLL®CLEAR collagen, a mixtur
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Ehrenhofer, Adrian, and Thomas Wallmersperger. "Adjustable fluid and particle permeation through hydrogel composite membranes." Sage, 2017. https://tud.qucosa.de/id/qucosa%3A74231.

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Membranes act as smart structures in respect to their permeation abilities. Control of particle and fluid permeation through a synthetic membrane can be achieved by using different effects like size-exclusion or electromagnetic interactions that occur between the particles and membrane pores. The simulation of controlled permeability provides an insight into the smart behavior of membranes for chemical signal processing, sensing interfaces or lab-on-a-chip devices. In the current work, we model the underlying physical processes on a microfluidic level using the engineer’s approach of laminar f
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Haji, Aminoddin, Komeil Nasouri, Ahmad Mousavi Shoushtari, and Ali Kaflou. "Reversible Hydrogen Storage in Electrospun Composite Nanofibers." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35201.

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Composite nanofibers containing single-walled carbon nanotubes (SWNT) were prepared by using elec-trospinning technique and hydrogen adsorption/desorption isotherms were carried out by a Sieverts appa-ratus at room temperature. The SEM analysis of the nanofibers revealed that the deformation of the nano-fiber increases with increasing SWNT concentration. The diameter of neat nanofibers was below 200 nm and had smooth surface. The surface of the composite nanofibers was rough even by adding low quantity of SWNT. The hydrogen storage results showed an improvement in the adsorption capacity with
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Mirbaha, Matin. "Development and shaping of conductive composite hydrogels for flow capacitive deionization (FCDI)." Electronic Thesis or Diss., Université Paris sciences et lettres, 2024. http://www.theses.fr/2024UPSLS004.

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La déionisation capacitive sous écoulement (FCDI) est une technologie de dessalement de l’eau qui repose sur l'adsorption d'ions sur des électrodes fluides, généralement constituées de matériaux poreux à base de carbone, qui permettent de renouveler en permanence la surface des électrodes. Une des principales limitations est le colmatage de la cellule d’écoulement dû à la friction entre les particules solides conductrices. Nous émettons l'hypothèse que ce problème peut être résolu en encapsulant les particules dans une matrice polymère.Ce projet vise ainsi à mélanger des matériaux à base de ca
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Way, Amanda E. "Stimuli-Responsive Nanofiber Composite Materials: From Functionalized Cellulose Nanocrystals to Guanosine Hydrogels." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1390388160.

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Yata, Tomoya. "Development of efficient amplification method of DNA hydrogel and composite-type DNA hydrogel for photothermal immunotherapy." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215494.

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Mistry, P. "Development of a core-shell composite hydrogel for 3D bioprinting." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/50395/.

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Recently, 3D printing has become popular in the field of tissue engineering, where materials and biology are combined with the aim of producing functional tissues for regenerative medicine therapies and for in vitro disease and toxicology models. However, current 3D printing techniques are not able to produce functional tissue-engineered constructs that are physiologically-relevant in the long-term. Challenges arise when combining desired mechanical properties with biological properties in a single construct. Often, cell-supportive materials lack mechanical stability and mechanically-robust ma
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Wright, Lee David. "Tissue Engineering Cartilage with a Composite Electrospun and Hydrogel Scaffold." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/37553.

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Osteoarthritis is the most prevalent musculoskeletal disease in humans, severely reducing the standard of living of millions of people. Osteoarthritis is characterized by degeneration and loss of articular cartilage which leads to pain, and loss of joint motility and function. Individuals suffering from severe osteoarthritis are commonly treated with full knee replacements. The procedure does eliminate the problem of degrading cartilage tissue; however, it does not fully restore function and its lifetime can be limited. To overcome the disadvantages of current treatments, tissue engineerin
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Han, 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.

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Kurban, Z. "Electrospun nanostructured composite fibres for hydrogen storage applications." Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1333231/.

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The urgent realisation of the low carbon economy requires the development of cheap, safe and lightweight hydrogen storage, both for commercialisation of hydrogen fuel cell vehicles, and for the use of hydrogen as a reservoir of energy from intermittent renewable energy sources. The primary motivation of this PhD project was to investigate (co)electrospinning, a cheap and scalable fibre production technique, for nanostructuring potential solid state hydrogen storage materials. Solid state storage of hydrogen is being extensively investigated worldwide. However, many of the candidate materials a
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Ramírez, Caballero Silvia. "Composites made of bioceramic and chitosan physical hydrogel as potential bone substitutes." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI010/document.

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Les substituts osseux synthétiques servent au remplacement temporaire des tissus osseux, favorisent la formation, la croissance et la survie de l’os et sont biorésorbables. Aucun matériau monophasé ne remplissant complètement ces exigences, un matériau composite bioinspiré est une alternative possible. L’objectif de cette thèse était par conséquent d’étudier la synthèse et les propriétés de deux composites biocéramiques/biopolymères : des hydrogels physiques de chitosane minéralisés avec de l’apatite, et une hardystonite architecturée imprégnée par des hydrogels physiques de chitosane. Afin d’
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Fu, Ying. "Investigation on hydrogen storage properties of Mg-based nanostructured composites." Aachen Shaker, 2007. http://d-nb.info/987661493/04.

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42

Guillaud, Nicolas. "Tolérance aux dommages générés par impact de structures composites épaisses. Application aux réservoirs composites hyperbares." Thesis, Paris, ENSAM, 2015. http://www.theses.fr/2015ENAM0040/document.

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Cette thèse s'est déroulée dans le cadre du projet TOLEDO (Tolérance aux dommages par impact des réservoirs hyperbares) piloté par Air Liquide en partenariat avec le CEA Le Ripault et l'institut PPRIME.L'hydrogène est stocké au sein de réservoirs de type IV à une pression de service de 700 bar.Ces structures composites présentent comme particularités d'être épaisses (&gt; 30 mm), d'avoir une forte courbure et d'être préchargées en pression lors d'un éventuel impact.Notre travail a montré que ces particularités modifient le type, la quantité et la localisation des différents endommagements cour
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Barros, Manuel João Salazar Guedes de. "Fabrication of hydrogel-bioactive glass composite scaffolds for bone tissue engineering." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/17461.

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Mestrado em Materiais e Dispositivos Biomédicos<br>Bone is an extremely important connective tissue in the human body, as it provides support and protection of internal organs, being also metabolically relevant as the main mineral reservoir and assuring haematopoiesis through the bone marrow. Due to the current ageing of the population, an increase in bone tissue related diseases is noticeable. Thus, more efficient therapies for treating bone diseases is crucial. Tissue Engineering appears as a promising technology for treating several of those problems, such as bone loss and joint problems.
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Barnes, Devon. "In vitro bioengineering applications of melt electrowritten and hydrogel composite scaffolds." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/212352/1/Devon_Barnes_Thesis.pdf.

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Two-dimensional cell cultures provide an inaccurate representation of how cells develop and are affected by disease and injury. Scaffold-based tissue engineering techniques that combine novel biomaterials and printing methods could assist in the design of more physiologically relevant, three-dimensional experimental tissue models. This thesis investigated the application of carbohydrate glass as a sacrificial material toward producing perfusable hydrogel devices using melt electrowriting, the development and optimisation of a three-dimensional bioengineered bone marrow microenvironment, and a
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GUPTA, PREETI. "HYDROGEL BASED WOUND DRESSING MATERIAL." Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18806.

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Weak mechanical strength of hydrogels in wet condition limits their use for load bearing applications. Their mechanical strength can be raised by grafting them over some support or by converting them into nanofibrous form. Present thesis is focused on the preparation of poly (acrylamide-co-acrylic acid) hydrogel grafted over cotton fabric using two different cross-linkers i.e. PEG and MBAAm for making medicated dressing and nanofibers of hydrogel of poly (acrylamide-co-acrylic acid). FTIR was used to confirm the insertion of cross-links into the polymer chains. Grafting of uniform hydro
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Chen, Li. "Hydrogel/Polymer Micelles Composites Derived from Polymerization of Microemulsions for Oral Drug Delivery." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1374539384.

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Lally, Sarah Joanne. "pH-responsive hydrogel composites containing microgels : restoring intervertebral disc height through polymer composition." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/phresponsive-hydrogel-composites-containing-microgels-restoring-intervertebral-disc-height-through-polymer-composition(594cac41-952a-46a5-bad6-632d32cad3b1).html.

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This thesis presents a study into the use of microgels to restore degenerated intervertebral discs (IVDs). This was undertaken using a pH-triggered microgel which was able to form self-supporting gels through an increase in pH. The microgels were based on the poly(A/MAA/X) formulation, where MAA is methacrylic acid and A is the structural and X is the crosslinking monomer. The microgel particles were also used to construct composite poly(ethylene glycol) dimethacrylate (PEGD) hydrogels. The properties of the microgels and the composite hydrogels were then investigated. Microgel particles were
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Annamalai, Perushini. "Electrospinning of porous composite materials for hydrogen storage application." University of the Western Cape, 2016. http://hdl.handle.net/11394/5654.

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>Magister Scientiae - MSc<br>Due to the rapid depletion of fossil fuel reserves and the production of environmentally harmful by-products such as carbon dioxide, there is an urgent need for alternate sustainable clean energy. One of the leading candidates in this endeavour is hydrogen, which can be used as an energy carrier since it has a high energy density, zero emissions and is produced from non-depletable resources such as water. The major challenge hindering a hydrogen economy is the lack of safe and effective storage technologies for mobile applications. A prospective solution to this pr
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El-Zarouk, Khaled Mohamed. "Composite inorganic membranes for hydrogen reaction, separation and purification." Thesis, Robert Gordon University, 2007. http://hdl.handle.net/10059/1249.

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Silica-alumina composite membranes for hydrogen separation and high temperature chemical reactions were prepared using both conventional and modified dip-coating techniques. These were deposited on commercially available a.-alumina macroporous support of 10 millimetre (mm) outer diameter, 7 mm inner diameter and average pore size of 6000 nanometre (nm) wash coated with Titania. The reactants of the coating technique were silicone elastomer and isopentane promoted by a catalyst. The catalyst (silicone curing agent) was added as a templating agent to control the eventual adhesion and densificati
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Ehrenhofer, Adrian, Manfred Hahn, Martin Hofmann, and Thomas Wallmersperger. "Mechanical behavior and pore integration density optimization of switchable hydrogel composite membranes." Sage, 2019. https://tud.qucosa.de/id/qucosa%3A74211.

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Switchable hydrogel-layered composite membranes can be used for the analysis of particle size distributions. This functionality is provided by pores with controllable diameter. In order to obtain a device that can be used to measure the cell size distribution in native biological samples, lots of switchable pores are required. In the current work, we model and simulate the mechanical behavior of active composite membranes with switchable pores. This is done in order to find the maximum number of pores that can be integrated into a membrane without cross-influencing effects on the actuation of
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