http://hdl.handle.net/2117/3959 2013-05-21T14:10:41Z http://hdl.handle.net/2117/19094 Title: Comportamiento y propiedades de las fibras de polilactida (PLA) durante su procesado y uso Authors: Cayuela Marín, Diana; Manich Bou, Albert M. 2013-05-03T13:04:02Z http://hdl.handle.net/2117/18300 Title: MODSIMTex Authors: Tornero García, José Antonio 2013-03-14T13:46:50Z http://hdl.handle.net/2117/18215 Title: Chicken feathers based composites: a life cycle assessment Authors: Molins Durán, Gemma; Álvarez del Castillo, María Dolores; Garrido Soriano, Núria; Macanàs de Benito, Jorge; Carrillo Navarrete, Fernando Abstract: Chicken feathers (CFs) are a waste material generated from poultry industry in large quantities. A composite material constituted of poly lactide and CFs is proposed in order to prepare a biodegradable composite with low environmental impact. In order to evaluate its environmental impact, a Life Cycle Assessment (LCA) is performed. The results show that, from the environmental point of view, the more chicken feathers in the material, the greater is its impact. This is mainly due to the non - inclusion of the impact data regarding CFs current waste management treatments required in accordance with the European Directive CE 1069/2009 (in study) and to the high energy consumption of the pre - treatment stages (cleaning and sanitizing) required to transform CFs waste into a CFs technical material that can be used for the preparation of CFs/PLA composites material, which needs to be optimized. 2013-03-12T14:31:40Z http://hdl.handle.net/2117/17936 Title: Responses of B-esterase enzymes in oysters (Crassostrea gigas) transplanted to pesticide contaminated bays form the Ebro Delta (NE, Spain) Authors: Ochoa, Victoria; Riva Juan, Mª del Carmen; Faria, Melissa; Barata, Carlos Abstract: Marine bivalves such as oysters are widely used as bioindicators to monitor marine coastal pollution. This study aimed to use B-esterase activity responses in oysters (Crassostrea gigas) cultured in Ebro Delta bays to monitor environmental effects of pesticides. The B esterases investigated were acetylcholinesterase, propionylcholinesterase, and carboxylesterase and their activities were measured in adductor muscle and gills from oysters transplanted in Ebro Delta bays where the are traditionally grown. Enzyme activities were related with physico-chemical parameters and pesticide levels measured in water. Cholinesterase activities measured in gills were unaffected across sites and periods. Conversely, carboxylesterase activities in oyster gills varied across periods and sites and were negatively correlated with residue levels of organophoshporous and carbamate pesticides in water. Therefore, inhibition of carboxylesterase activities can be considered a good indicator of exposure to anti-cholinergic pesticides in oysters 2013-02-22T12:26:45Z http://hdl.handle.net/2117/17794 Title: Instrumento quirúrgico de sutura para anastomosis automática del tubo digestivo Authors: Tornero García, José Antonio; Suárez Feijóo, Raúl; Cano Casas, Francesc; Montaño Sarria, Andrés Felipe; López Cano, Manuel Abstract: En la cirugía digestiva, una anastomosis del intestino consiste en la reconstrucción del tubo digestivo por unión de dos cabos tras la resección de una porción del mismo. Este procedimiento, de común aplicación en diversos tipos de intervención quirúrgica se realiza actualmente mediante la aplicación de grapas metálicas debido a la complejidad inherente de la realización de una sutura manual. La automatización del proceso de sutura mediante un dispositivo diseñado a tal efecto supondría una notable mejora en el procedimiento quirúrgico asociado y posteriormente en la calidad de vida del paciente, ya que las grapas metálicas empleadas actualmente presentan diversos inconvenientes. El diseño de este dispositivo presenta gran complejidad debido al rigor de los requisitos funcionales y a la complejidad del entorno de funcionamiento así como las características de los materiales que intervienen en el proceso.En el presente trabajo se describe el desarrollo de un prototipo de dispositivo para anastomosis automática mediante sutura, evaluando su funcionalidad a nivel de laboratorio, con objeto de probar su validez 2013-02-15T13:50:44Z http://hdl.handle.net/2117/17419 Title: Effect of continuous post-setting on crystallinity and thermomechanical behaviour of False-Twist Textured Polylactide multifilaments Authors: Manich Bou, Albert M.; Carilla Auguet, Josep; López Santana, Daniel; Baena, Barbara; Riba Moliner, Marta; Prieto Fuentes, María Remedios; Montero Palacios, Lucila; Cayuela Marín, Diana Abstract: Polylactide (PLA) multifilaments, false-twist textured at different temperatures (135, 150 and 165ºC) and draw ratios (1.30, 1.35 and 1.40) have been stabilized by a continuous post setting treatment at 50 m/min and 100ºC using a specially designed chamber. The crystallinity of the original textured filaments and those of the stabilized ones has been measured. The effect of post setting on the thermomechanical behaviour according to the texturing conditions has been studied. The relationship between crystallinity and both relaxation shrinkage and maximum phase lag temperature have been pointed out 2013-01-18T11:59:58Z http://hdl.handle.net/2117/16751 Title: Optimisation of the electrochemical and UV combined treatment to remove colour and organic halogenated compounds of textile effluents Authors: Riera Torres, Miquel Antoni; Gutiérrez Bouzán, María Carmen Abstract: Different electrochemical oxidation and UV irradiation treatment conditions were studied to improve the removal of colour and organic halogenated compounds of textile effluents wastewater so as to minimize their environmental impact. Synthetic dyeing effluents containing a reactive dye (CI Reactive Black 5, Procion Crimson H-EXL, Procion Navy H-EXL, Procion Yellow H-EXL and Procion Blue H-EXL) and Na2SO4 as dyeing electrolyte were studied. Ti/Pt oxides electrodes at different current densities (3, 6,12,24 and 40 mA/cm2) and three UV irradiation lamps (6 and 9W; 254, 360 and 365 nm maximum emission) were used. Results showed that total colour and organic halogenated compounds removal were achieved by UV irradiation after electrochemical treatment. A clear influence of current density and the type of UV lamp on colour removal was found, being the submerged lamps into the dye solution the most efficient. Kinetic constants of the UV irradiation step were calculated 2012-10-18T11:04:25Z http://hdl.handle.net/2117/16745 Title: Electrochemical techniques in textile processes and wastewater treatment Authors: Sala Gastón, Mireia; Gutiérrez Bouzán, María Carmen Abstract: The textile industry uses the electrochemical techniques both in textile processes (such as manufacturing fibers, dyeing processes, and decolorizing fabrics) and in wastewaters treatments (color removal). Electrochemical reduction reactions are mostly used in sulfur and vat dyeing, but in some cases, they are applied to effluents discoloration. However, the main applications of electrochemical treatments in the textile sector are based on oxidation reactions. Most of electrochemical oxidation processes involve indirect reactions which imply the generation of hypochlorite or hydroxyl radical in situ. These electrogenerated species are able to bleach indigo-dyed denim fabrics and to degrade dyes in wastewater in order to achieve the effluent color removal. The aim of this paper is to review the electrochemical techniques applied to textile industry. In particular, they are an efficient method to remove color of textile effluents. The reuse of the discolored effluent is possible, which implies an important saving of salt and water (i.e., by means of the “UVEC Cell”) 2012-10-17T13:22:29Z http://hdl.handle.net/2117/16518 Title: Electrochemical decolourisation of cotton dye baths for reuse purposes: a way to reduce salinity of the textile wastewater Authors: López Grimau, Víctor; Gutiérrez Bouzán, María Carmen; Sala, Mireia; Crespi Rosell, Martin Abstract: Electrochemical techniques offer many advantages for the treatment of industrial effluents. These processes are clean, operate at room temperature, and in most cases, do not need the addition of reagents (as in the case of reactive dyeing effluents). In particular, the electrochemical treatment of textile effluents is an efficient method to remove colour. In this work, diverse synthetic effluents containing reactive dyes were treated in an electrochemical cell with Ti/PtO x electrodes. The efficiency of the process to remove colour and the use of an additional UV irradiation were evaluated. Once the conditions were established in synthetic effluents, they were applied on two types of exhausted reactive dye baths collected from a cotton mill. Instead of the effluent discharge, another possibility is to reuse the decoloured effluents for a new dyeing process. In this sense, diverse experiments were carried out and conditions for the effluents reuse were established. The reuse of dyeing effluents implies an important reduction of the salt and water consumption as well as a reduction of the salinity of the discharged effluents. 2012-09-18T16:52:52Z http://hdl.handle.net/2117/16446 Title: Epitaxial BaZrO3 tracks by electrospinning of metalorganic fibers on single crystals Authors: Obradors i Berenguer, Francesc Xavier; Calleja Lázaro, Albert; Ricart Miró, Susagna; Granados García, Javier A.J.; Palmer Paricio, Xavier; Solano Reina, Enrique; Tornero García, José Antonio; Cano Casas, Francesc; Puig Molina, Teresa 2012-09-06T11:13:55Z http://hdl.handle.net/2117/16357 Title: Composites from keratin biofibers. Study of compatibility using polyolephinic matrices Authors: Carrillo Navarrete, Fernando; Rahalli, A; Cañavate Ávila, Francisco Javier; Colom Fajula, Xavier Abstract: The study deals with the analysis and characterization of chicken feathers (CFs) based thermoplastic composites. The performance of the composite has been characterized in terms of mechanical properties which have been related to the fibre-matrix compatibility of the composite components analyzed by FTIR and SEM. The results have shown that the addition of short CFs as a filler to the PP thermoplastic matrix did not significantly improve the mechanical properties. A slightly increase of the stiffness has been observed when using small quantities of CFs (5-10% v/v) that provides to the composites a more brittle behaviour. Analogous behaviour has been observed for HDPE/CFs composites. FTIR spectroscopy and SEM micrographs analyses show limited compatibility between the composite components (CFs and polyolephinic matrices) 2012-07-27T11:24:04Z http://hdl.handle.net/2117/16355 Title: Use of chicken feathers waste for the fabrication of composite materials Authors: Carrillo Navarrete, Fernando; Macanàs de Benito, Jorge; Colom Fajula, Xavier; Cañavate Ávila, Francisco Javier; Molins Durán, Gemma; Álvarez del Castillo, María Dolores; Garrido Soriano, Núria Abstract: Chicken feathers (CFs), mainly discarded nowadays, are an alternative reinforcement to be applied in the preparation of composite materials (CMs). The effect of different sanitizing methods on the properties of both CFs and the corresponding CMs has been studied. Some characteristic parameters such as density have been found to be dependent on the treatment that CFs endure, whereas the mechanical properties of the CMs made of thermoplastics matrices (e.g. polypropylene and high density polyethylene) were only slightly affected by the treatment. The introduction of CFs decreased the tensile strength of the CMs compared with the neat polymers while other parameters (e.g. Young’s modulus) were essentially unaffected 2012-07-27T09:35:40Z http://hdl.handle.net/2117/15687 Title: Aplicación del ensayo de solubilidad diferencial a la caracterización de la estructura fina de las fibras químicas Authors: Gacén Guillén, Joaquín; Maillo Garrido, Josefina; Cayuela Marín, Diana; Baixauli Baixauli, Juan José Abstract: Se ha aplicado el ensayo de solubilidad diferencial a grupos de sustratos de fibras de poliéster, poliamida, acrílicas y fibras químicas celulósicas. Se ha puesto de manifiesto su sensibilidad para detectar diferencias de estructura fina en grupos de sustratos fabricados o procesados en diferentes condiciones, o procedentes de diferentes productoras. 2012-03-30T08:12:06Z http://hdl.handle.net/2117/15358 Title: High temperature transformation of electrospun BaZrO3 nanotubes into nanoparticle chains Authors: Obradors i Berenguer, Francesc Xavier; Puig Molina, Teresa; Tornero García, José Antonio; Cano Casas, Francesc; Calleja, Albert; Granados, Xavier; Ricart, Susana; Oro, Judith; Arbiol, Jordi; Mestres, Narcís; Carrillo, Ana Esther; Palmer, Xavier 2012-02-24T11:54:45Z http://hdl.handle.net/2117/15029 Title: Differential scanning calorimetry and elasticity of textured, heat set and mechanical strained polylactide multifilaments Authors: Manich Bou, Albert M.; Carilla Auguet, Josep; Miguel Lopes, Rui Alberto; Baena, Barbara; Lucas Mendes, Jose; Marti Gelabert, Meritxell; Cayuela Marín, Diana Abstract: Industrially textured PLA multifilaments were heat set under different conditions at 110 ºC for 1 min and subjected to one cycle of deformation up to 20%. Thermal transitions of the original textured, heat set and cyclic strained filaments were measured using differential scanning calorimetry from 25 to 250 ºC. Cyclic deformation induces an endo-exo transition at peak temperatures between 55 - 60 ºC that is not observed in the original textured and heat set multifilaments. There is another endo-exo transition with peak temperatures between 67 and 72 ºC in all filaments, the intensity of which varies according to texturing conditions, heat setting and cycle strain. Texturing conditions, heat setting and cyclic strain play a role in thermal transitions, the strain at breaking and elastic properties of the filaments. The crystallinity and magnitude of the endo-exo thermal events detected by DSC are related to the strain at breaking and elasticity of polylactide textured multifilaments 2012-02-09T12:53:09Z