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Pereira Espíndola, S. (author)The urgent need to address sustainability within material science, driven by global environmental concerns over pollution, climate change, and resource scarcity, has led to a growing interest in bio-based materials. This thesis explores the potential of biopolymers as alternatives to non-renewable resources, specifically the ones derived from...doctoral thesis 2023
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Rangel Cardenas, A.L. (author)In this thesis several aspects of PEM fuel cells are discussed. From an atomic scale, e.g. crystal and electronic structure of a non-noble metal material, e.g. (H)zLiMn2O4 (protonated spinel lithium manganese oxide) for electrocatalysis and its dynamics, to meso-macro scale effects such as those concerning transport resistances at the membrane...doctoral thesis 2021
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Greidanus, A.J. (author)This thesis describes the investigation of the dynamics of turbulent shear flows over non-smooth surfaces. The research was conducted in two parts, related to the experimental facility used in combination with the applied functional surface. The first part describes the experiments of a turbulent Taylor-Couette flow over a...doctoral thesis 2020
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Westsson, E.E. (author)The increasing energy demand of the world population in combination with tangible climate change effects stemming from rising carbon dioxide emissions is currently characterizing a large portion of the political and societal debate. Despite huge technological advancement in the field of renewable energy resulting in energy prices lower than that...doctoral thesis 2019
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Chu, L. (author)Atomic Force Microscopy (AFM) can not only image the topography of surfaces at atomic resolution, but can also measure accurately the different interaction forces, like repulsive, adhesive and lateral existing between an AFM tip and the sample surface. Based on AFM, various extended techniques have been developed such as colloidal probe AFM,...doctoral thesis 2018
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Zlopasa, J. (author)Nature displays a multitude of fascinating materials, from beautiful colors of butterfly wings to the toughness of mullosc shells, which are formed in mild enviornmental conditions with commonly occuring materials, such as chitosan or calcium carbonate. These composite materials display an intricate interplay of biopolymers and minerals forming...doctoral thesis 2017
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Cordova Chavez, M.E. (author)Crude oil, coal and gas are currently the main resources of energy in the world. The World Energy Outlook claimed in 2007 that the major source of energy (about 84%) would still be generated from fossil fuels in 2030. By these projections, the world's fossil fuel reserves will be consumed within a few decades, making it necessary to have a well...doctoral thesis 2017
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Vilcinskas, K. (author)In this work, properties of Calcium alginate-reduced graphene oxide and Barium alginate‐reduced graphene oxide composite films are explored. In addition, the properties of the divalent metal ion-cross-linked alginate composite films are compared to the analogous properties of uncross‐linked Sodium alginate-graphene oxide composite films of the...doctoral thesis 2016
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Gao, J. (author)Two sulfonated aramids, poly(2,2’-disulfonylbenzidine terephthalamide) (PBDT) and poly(2,2’-disulfonylbenzidine isophthalamide) (PBDI) were synthesized with the aim to explore their unique morphology for proton exchange membrane applications. Due to the different polymer structures, PBDT forms a nematic liquid crystal, whereas PBDI is isotropic....doctoral thesis 2015
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Drost, S. (author)The efficiency of polymer extrusion processes can be severely limited by the occurrence of viscoelastic extrusion instabilities. In a para-aramid fibre spinning process, for example, a ?m-scale extrusion instability is responsible for the waste of tons of polymer per year. At present, a considerable amount of research literature is available on...doctoral thesis 2015
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Latsuzbaia, R. (author)In this thesis, I discuss a novel idea of fuel cell catalyst regeneration to increase lifetime of the PEM fuel cell electrode/catalyst operation and, therefore, reduce the catalyst costs. As many of the catalyst degradation mechanisms are difficult to avoid, the regeneration is alternative option to prolong catalyst lifetime. In the thesis, I...doctoral thesis 2015
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Liu, Z. (author)The aim of this thesis is to execute a bottom-up design of the intrinsically self-healing nanocomposites. We briefly introduced the self-healing materials in chapter 1, covering classification and basic self-healing mechanism. In chapter 2, we have synthesized polyborosiloxane (PBS) according to the last century recipe as the self-healing...doctoral thesis 2015
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Negro, E. (author)Graphitic materials have attracted a great interest in the field of sustainable energy production and storage because of their excellent electrical, mechanical and chemical properties. This thesis modestly contributes to this global research by investigating new interconnected carbon nanostructures, here called Carbon Nano-Networks (CNNs). The...doctoral thesis 2014
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Garcia-Tamayo, E. (author)The remarkable physicist Richard P. Feynman once said, more than fifty years ago: ”the principles of physics, as far as I can see, do not speak against the possibility of maneuvering things atom by atom. It is not an attempt to violate any laws; it is something, in principle, that can be done; but in practice, it has not been done because we are...doctoral thesis 2014
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Van Lent, D.Q. (author)The adhesion between bitumen and aggregate is a complex process with numerous of variables. To improve the understanding of the bond between bitumen and aggregates in road applications, this research focuses on preferential adsorption, which is one aspect of bitumen-aggregate adhesion. The main objective is to find out whether there is...doctoral thesis 2014
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Faraz, M.I. (author)In this thesis we report the synthesis, characterization and thermo-mechanical properties of a high-temperature resistant themoset nanocomposite system based on an aero-space-grade Bismaleimide resin. Various processing techniques with various fillers are used. The emphasis is on establishing the relationship between the structure and mechanical...doctoral thesis 2013
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Wadekar, M.N. (author)The purpose of this thesis is to design, create and study basic building blocks for the construction of self-assembled nanostructured electrodes and membranes for PEMFC. The research described deals with the synthesis of polymerizable fluorosurfactant (1) and its non-polymerizable analogue (2) and the study of their self-assembly properties....doctoral thesis 2012
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An, H. (author)New magneto rheological systems that respond mechanically to external homogeneous magnetic fields, namely, physically cross-linked magneto rheological (MR) gels, were synthesized and investigated. Various aspects of the rheological behavior were considered such as linear viscoelastic response for various pre-aligned sample geometries, transient...doctoral thesis 2012
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Kowlgi, N.K.K. (author)Self-Assembly has predominantly been nature's unique tool for building remarkable entities. This thesis shows how this versatile tool can be utilised for building devices that are useful to mankind. Starting with advanced fuel cells which produce clean energy in a highly efficient way; continuing on to carbon nano networks which are one of the...doctoral thesis 2012
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Locati, C. (author)The fast-growing market on electronic portable devices is possibly due to the development of Li-ion batteries. Besides, such batteries are the most promising candidates as energy storage media in (hybrid) electric vehicles, in the near future. However, improvements on electrochemical performances and on safety need to be achieved. With respect...doctoral thesis 2012
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