Now showing items 30-49 of 49

    Mechanical and functional properties in magnetic materials 

    Calvo de la Rosa, Jaume (Date of defense: 2019-10-25)

    This doctoral Thesis has been focused on the preparation of magnetic materials by different methods, the characterization of their structural characteristics, and the understanding of their mechanical and magnetic properties. ...

    Microstructural characterization and mechanical properties of 9%Ni steel welds by submerged arc welding process using nickel-base alloys 

    Ozaeta Laverde, Pablo (Date of defense: 2017-07-12)

    Natural Gas with more than 80% methane has a liquefaction temperature around -165 ° C. Temperature at which the gas reduces its volume by a factor of 600/1. This operating temperature makes the use of ferritic materials ...

    Modelling Nano-Oxide Materials with Technological and Environmental Relevance: Silica, Titania and Titanosilicates 

    Cuko, Andy (Date of defense: 2018-09-24)

    Properties of nanomaterials are known to be size dependent and generally are very different from those of the corresponding bulk. Such behaviour, which is strongly system and structure dependent, allows one to tune material’s ...

    Models and Computational Methods Applied to Industrial Gas Separation Processes and Enhanced Oil Recovery 

    Alonso Benito, Gerard (Date of defense: 2019-11-29)

    Two main topics are treated in this doctoral thesis from a theoretical and computational point of view: the gas capture and separation from post-combustion flue gases, and the enhanced oil recovery from oil reservoirs. The ...

    Monte Carlo based methods applied to heterogeneous catalysis and gas separation 

    Prats Garcia, Hèctor (Date of defense: 2019-03-25)

    The research work presented in this thesis is divided in two main topics: gas separation and heterogeneous catalysis. Although the systems studied in one part and another are quite different, they share two fundamental ...

    Nitrate and Pesticide Removal from Groundwater Using Different Electrochemical Reactors 

    Oriol López, Roger (Date of defense: 2023-10-23)

    [eng] Groundwater has been traditionally considered a reliable source of freshwater. However, the low replenishment rates and the increasing contamination due to different anthropogenic activities, such as the use of ...

    Nitrate salt-based nanofluids for thermal energy storage 

    Svobodova, Adela (Date of defense: 2022-07-19)

    For the development of more compact and efficient thermal systems, nanofluids are presented as a promising option to replace conventional heat transfer fluids. Nanofluids are a suspension of low concentration of nanoparticles ...

    Prediction of partition coefficients for systems of micelles using DFT 

    Saranjam, Leila (Date of defense: 2023-10-30)

    [eng] A compound’s solvent−water partition coefficient (log P) measures the equilibrium ratio of the compound’s concentrations in a two-phase system: as two solvents in contact or a system of micelles in an aqueous ...

    Pretreatment to the leaching of copper sulphides minerals in oxidizing media 

    Quezada Reyes, Víctor Alejandro (Date of defense: 2021-01-29)

    La producción chilena de cobre procede de la hidrometalurgia y la concentración; el concentrado de cobre es tratado tradicionalmente mediante pirometalurgia. De acuerdo a Cochilco, el cobre producido en el año 2019, vía ...

    Processes and catalysts for the electrochemical removal of persistent organic micropollutants from urban wastewater at mild Ph 

    Ye, Zhihong (Date of defense: 2019-11-29)

    Organic micropollutants, including pharmaceuticals, personal care products (PCPs), pesticides, dyes and many other industrial chemicals have become one of the most solid barriers for the effective and safe wastewater ...

    Quantum Confinement of Gaseous Molecules in Nanostructures: Effects on the Dynamics and Internal Structure 

    Mondelo-Martell, Manel (Date of defense: 2018-06-18)

    Quantum confinement effects, understood as the changes on the structure and dynamics of a molecule when it goes from a free environment to a cavity with some characteristic length of the order of the nanometer, represent ...

    Rational chemical design of Triarylmethyl-based devices and 2D materials 

    Alcón Rovira, Isaac (Date of defense: 2018-03-14)

    In this PhD thesis I have studied through state-of-the-art quantum simulations (mainly within the density functional theory approach, DFT) triarylmethyl (TAM) based systems with potential for future nano-devices and designed ...

    Rationalization of the Mechanism of Bistability in Dithiazolyl-based Molecular Magnets 

    Francese, Tommaso (Date of defense: 2019-03-25)

    In this work, we characterized and studied the properties associated to DTA-based bistable organic molecular magnetic systems, namely PDTA and TDPDTA, respectively. In both cases, the low and high temperature phases have ...

    Recubrimientos micro-nano estructurados de grandes espesores por proyección fría para la reparación y protección de componentes industriales de altro valor añadido 

    Bedoya Escobar, Juliana (Date of defense: 2017-07-12)

    La proyección fría es una técnica de proyección térmica que permite la obtención de recubrimientos metálicos y metal/cerámicos con estructuras densas (porosidad inferior a 0,1%) y libres de óxidos. De manera general, ésta ...

    Strategies to synthesize carbon-supported elctrocatalysts with reduced Pt content and increased activity for use in low temperature fuel cells 

    Garcia Cardona, Júlia (Date of defense: 2023-12-04)

    [eng] Conventional catalysts for polymer electrolyte fuel cells are based on Pt supported on porous carbons, generally carbon blacks. However, Pt is expensive and scarce and is poisoned by CO, which is present in the ...

    Structural organization of model membranes: a complementary approach combining atomic force microscopy and X-ray techniques 

    Gumí Audenis, Berta (Date of defense: 2018-04-27)

    Biological membranes (BMs) are self-sealing boundaries, which confine the permeability barriers of cells and organelles and provide the means to compartmentalize functions. Apart from being crucial for the cell structure, ...

    Study of solid particle materials as high temperature Thermal Energy Storage and Heat Transfer Fluid for Concentrating Solar Power 

    Calderón Díaz, Alejandro (Date of defense: 2019-10-24)

    Renewable energies have a major role in today’s energy systems development, energy security and climate change fight. Thermal Concentrating Solar Power (CSP) has the potential to get up to 11.3% of world’s electricity ...

    Theoretical reaction and relaxation dynamics in superfluid helium nanodroplets 

    Blancafort Jorquera, Miquel (Date of defense: 2019-11-15)

    The study of superfluid helium has been carried out mainly by physicists. In recent years, taking advantage of the potentialities presented by superfluid helium nanodroplets (HeNDs) as inert matrices at very low temperatures ...

    Theoretical study of excited states in molecules and molecular aggregates relevant for optoelectronic applications 

    Climent Biescas, Claudia (Date of defense: 2017-07-07)

    In this thesis, different organic and organometallic molecules with interest for optoelectronic applications have been studied from a computational standpoint. The work presented in this thesis belongs to the molecular ...

    Transport and assembly of colloids in liquid crystals 

    Pagès Casas, Josep M. (Date of defense: 2019-07-19)

    Particles dispersed in nematic liquid crystals (NLCs), also called nematic colloids, are nowadays typical experimental systems studied in the field of Soft Matter. In this scenario, the interactions and forces between ...