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  • Measuring the proton conductivity of ion-exchange membranes using electrochemical impedance spectroscopy and Through-Plane cell

     Müller, Franciélli; Ferreira, Carlos A.; Azambuja, Denise S.; Aleman Llanso, Carlos Enrique; Armelin Diggroc, Elaine
    Journal of physical chemistry B
    Date of publication: 2014-01-30
    Journal article

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    The role of the incorporation of conducting polymer (CP), doped with different sulfonic acid organic molecules, in polystyrene (PS) and high-impact polystyrene (HIPS) with poly(styrene-ethylene-butylene) (SEBS) triblock copolymer has been investigated. Two factors associated with this model membrane system are addressed: (i) the influence of the presence of a low concentration of doped conducting polymer and (ii) the influence of the membrane preparation method. Membrane characterization and bulk conductivity measurements allowed the conclusion that proton conductivity has been promoted by the addition of CP; the best results were achieved for PAni-CSA, in either PS/SEBS or HIPS/SEBS blends. Additionally, the water uptake only decreased with the addition of PAni-doped molecules compared to the pure copolymer, without loss of ion-exchange capacity (IEC). Electrodialysis efficiency for HIPS/SEBS (before annealing) is higher than that for HIPS/SEBS (after annealing), indicating that membrane preparation method is crucial. Finally, through-plane cell arrangement proved to be an effective, quick, and time-saving tool for studying the main resistance parameters of isolating polymers, which is useful for application in industry and research laboratories working with membranes for electrodialysis or fuel cells.

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    Sensitive thermal transitions of nanoscale polymer samples using the bimetallic effect: Application to ultra-thin polythiophene  Open access

     Ahumada Heredero, Óscar; Perez Madrigal, Maria Del Mar; Ramírez García, Jorge; Curcó Cantarell, David; Esteves, Carina; Armelin Diggroc, Elaine; Luongo, Giovanni; Puiggali Bellalta, Jorge; Aleman Llanso, Carlos Enrique; Salvador Matar, Antonio
    Review of scientific instruments
    Date of publication: 2013-06-15
    Journal article

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    A sensitive nanocalorimetric technology based on microcantilever sensors is presented. The tech- nology, which combines very short response times with very small sample consumption, uses the bimetallic effect to detect thermal transitions. Specifically, abrupt variations in the Young¿s modu- lus and the thermal expansion coefficient produced by temperature changes have been employed to detect thermodynamic transitions. The technology has been used to determine the glass transition of poly(3-thiophene methyl acetate), a soluble semiconducting polymer with different nanotechno- logical applications. The glass transition temperature determined using microcantilevers coated with ultra-thin films of mass = 10 - 13 gis5.2 ¿ C higher than that obtained using a conventional differential scanning calorimeter for bulk powder samples of mass = 5 × 10 - 3 g. Atomistic molecular dynamics simulations on models that represent the bulk powder and the ultra-thin films have been carried out to provide understanding and rationalization of this feature. Simulations indicate that the film-air in- terface plays a crucial role in films with very small thickness, affecting both the organization of the molecular chains and the response of the molecules against the temperature.

    A sensitive nanocalorimetric technology based on microcantilever sensors is presented. The tech- nology, which combines very short response times with very small sample consumption, uses the bimetallic effect to detect thermal transitions. Specifically, abrupt variations in the Young’s modu- lus and the thermal expansion coefficient produced by temperature changes have been employed to detect thermodynamic transitions. The technology has been used to determine the glass transition of poly(3-thiophene methyl acetate), a soluble semiconducting polymer with different nanotechno- logical applications. The glass transition temperature determined using microcantilevers coated with ultra-thin films of mass = 10 − 13 gis5.2 ◦ C higher than that obtained using a conventional differential scanning calorimeter for bulk powder samples of mass = 5 × 10 − 3 g. Atomistic molecular dynamics simulations on models that represent the bulk powder and the ultra-thin films have been carried out to provide understanding and rationalization of this feature. Simulations indicate that the film-air in- terface plays a crucial role in films with very small thickness, affecting both the organization of the molecular chains and the response of the molecules against the temperature.

  • A synergistic combination of tetraethylorthosilicate and multiphosphonic acid offers excellent corrosion protection to AA1100 aluminum alloy

     Dalmoro, Viviane; dos Santos, João Henrique Zimnoch; Armelin Diggroc, Elaine; Aleman Llanso, Carlos Enrique; Azambuja, Denise S.
    Applied surface science
    Date of publication: 2013-05-15
    Journal article

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    This work describes a new mechanism for the incorporation of organophosphonic acid into silane self-assembly monolayers, which has been used to protect AA1100 aluminum alloy. The protection improvement has been attributed to the fact that phosphonic structures promote the formation of strongly bonded and densely packed monolayer films, which show higher surface coverage and better adhesion than conventional silane systems. In order to evaluate the linking chemistry offered by phosphonic groups, two functionalized organophosphonic groups have been employed, 1,2-diaminoethanetetrakis methylenephosphonic acid (EDTPO) and aminotrimethylenephosphonic acid (ATMP), and combined with tetraethylorthosilicate (TEOS) films prepared by sol¿gel synthesis. Results suggest that phosphonic acids may interact with the surface through a monodentate and bidentate coordination mode and, in addition, form one or more strong and stable linkages with silicon through non-hydrolysable bonds. Therefore, the incorporation of a very low concentration of phosphonic acids on TEOS solutions favors the complete coverage of the aluminum substrate during the silanization process, which is not possible using TEOS alone. The linking capacity of phosphonic acid has been investigated by FTIR-RA spectroscopy, SEM and EDX analysis, X-ray photoelectron spectroscopy (XPS), and quantum mechanical calculations. Finally, electrochemical impedance spectroscopy has been used to study the corrosion protection revealing that EDTPO-containing films afforded more protection to the AA1100 substrate than ATMP-containing films.

  • Novel epoxy coating based on DMSO as a green solvent, reducing drastically the volatile organic compound content and using conducting polymers as a nontoxic anticorrosive pigment

     Martí Barroso, Mireia; Molina Pérez, Laura; Aleman Llanso, Carlos Enrique; Armelin Diggroc, Elaine
    ACS Sustainable Chemistry & Engineering
    Date of publication: 2013-12-02
    Journal article

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    This work reports novel anticorrosive epoxy coatings based on safer dimethyl sulfoxide solvent and free of zinc anticorrosive pigment. The latter was replaced by conducting polymers, as nontoxic anticorrosive pigments. The procedure used for their formulation, spectroscopic characterization, thermal and mechanical properties have been discussed and compared with those of conventional epoxy coatings. Furthermore, accelerated and long-term corrosion assays have evidenced that the new epoxy coatings protect steel from chlorine aggressive medium for 2880 h and for 2 years in atmospheric corrosive medium. Therefore, the results evidenced an excellent corrosion resistance, excellent application, and aesthetic appearance of the new coatings. © 2013 American Chemical Society.

  • Bioactive nanomembranes of semiconductor polythiophene and thermoplastic polyurethane: Thermal, nanostructural and nanomechanical properties

     Perez Madrigal, Maria Del Mar; Giannotti, Marina I.; Oncins Marco, Gerard; Franco Garcia, Maria Lourdes; Armelin Diggroc, Elaine; Puiggali Bellalta, Jorge; Sanz Carrasco, Fausto; Del Valle Mendoza, Luis Javier; Aleman Llanso, Carlos Enrique
    Polymer Chemistry
    Date of publication: 2013-02-07
    Journal article

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  • Revestimientos a base de sílica e ácido fosfônico para proteção anticorrosiva da liga de alumínio AA2024-T3

     Dalmoro, Viviane
    Defense's date: 2013-11-04
    Universitat Politècnica de Catalunya
    Theses

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  • Membranas Poliméricas Íon Seletivas Aniônicas e Catiônicas Para Uso Em Eletrodiálise

     Müller, Franciélli
    Defense's date: 2013-09-27
    Universitat Politècnica de Catalunya
    Theses

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  • Formulation of anticorrosive paints employing conducting polymers  Open access

     Martí Barroso, Mireia
    Defense's date: 2013-07-08
    Universitat Politècnica de Catalunya
    Theses

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    The intention and purpose of the present thesis is to prepare a series of protective coatings using some conducting polymers (CPs) as corrosion inhibitors. The use of organic paints is the most common method for corrosion prevention. Anticorrosive coatings form a class of high-performance systems with a very wide range of applications and being classified in two broad groups: heavy-duty coatings, for high performance, and light-duty coatings, for medium performance. The first class being required for highly aggressive medium, like oil platforms, bridges, chemical industry plants, containers, shipping, and others; the late being employed mainly for outside industrial environments, urban environments, houses, offices, and others. This thesis consists of an overview and a compendium of the following work stages and results: 1. Preparation of nanostructured CPs for corrosion inhibition: Study of the ability of poly(N-methylpyrrole) to form nanostructures and the performance of such nanostructures when act as anticorrosive additive of organic coatings. 2. Partial replacement of metallic zinc dust usually employed in heavy duty protective coatings, by a small concentration of CPs: Study of the use of a small amount of polyaniline emeraldine salt as a partial substitute of metallic zinc dust in marine epoxy primers in order to maintain corrosion inhibition. 3. Evaluation of an environmentally friendly anticorrosive pigment for alkyd priming: Study of the substitution of a high concentration of zinc phosphate, commonly employed in light-duty coatings, by a very low concentration of polyaniline emeraldine base (undoped form), polyaniline emeraldine salt (doped form) and an eco-friendly polythiophene derivative (partially oxidized) in an alkyd coatings and the study of their protective performance using accelerated corrosion assays. 4. Preparation of a novel epoxy coating, based on DMSO as green solvent and free of zinc anticorrosive pigment, and its application on carbon steel protection: Formulation and evaluation of a novel anticorrosive epoxy coating based on DMSO solvent and free of zinc, using polyaniline emeraldine base and poly[2,2’-(3-methylacetate)thiophene] as anticorrosive pigments. All the results derived from the present thesis have been accepted or have been sent for publication in international journals and also reported in some international congresses, as we point below: 1. M. Martí, G. Fabregat, F. Estrany, C. Alemán, E. Armelin, “Nanostructured conducting polymer for dopamine detection”, J.Mater. Chem., 2010, 20, 10652-10660. 2. E. Armelin, M. Martí, F. Liesa, J.I. Iribarren, C. Alemán, “Partial replacement of metallic zinc dust in heavy duty protective coatings by conducting polymer”, Prog. Org. Coat., 2010, 69, 26-30. 3. M. Martí, G. Fabregat, D.S. Azambuja, C. Alemán, E. Armelin, “Evaluation of an environmentally friendly anticorrosive pigment for alkyd primer”, Prog. Org. Coat., 2012, 73, 321–329. 4. M. Martí, L. Molina, C. Alemán, E. Armelin, “Replacement of toxic solvents and anticorrosive pigments used in solvent-borne epoxy coatings by safer functional organic compounds”, submitted for publication in Journal of Hazardous Materials, 2013. 5. M. Martí, E. Armelin, J. Iribarren, C. Alemán. Soluble polythiophenes as anticorrosive additives for marine epoxy paints”, submitted for publication in Materials and Corrosion, 2013. 6. G. Fabregat, M. Martí, F. Estrany, C. Alemán, E. Armelin, “Nanostructured Poly(N-Methylpyrrole) and Its Application in Dopamine Detection”, E-MRS 2010 Spring Meeting. 2010, Strasbourg, France. 7. E. Armelin, M. Martí, F. Estrany, C. Alemán, “Environmentally friendly anticorrosive additive to replace zinc and its compounds in alkyd and epoxy primers”, 12th Mediterranean Congress of Chemical Engineering: shaping the future of chemical engineering. 2011, Barcelona, Spain

    El propósito de la presente tesis es preparar una serie de recubrimientos protectores empleando polímeros conductores (CPs) como inhibidores de la corrosión. El uso de pinturas orgánicas es el método más empleado para la prevención de la corrosión. Los recubrimientos anticorrosivos forman una clase de sistemas de alto rendimiento con una amplia variedad de aplicaciones y pueden ser clasificados en dos grandes grupos: recubrimientos de altas prestaciones y recubrimientos de suaves prestaciones. El primero de ellos es el que se emplea en estructuras expuestas a ambientes muy agresivos, tales como: plataformas petrolíferas, puentes, plantas industriales químicas, contenedores, barcos, entre otros; y el último es el que se suele emplear en el exterior de ambientes industriales, ambientes urbanos, casas, oficinas, entre otros. La presente tesis consiste en un compendio de las siguientes etapas del trabajo y resultados: 1. Preparación de CPs nanoestructurados para inhibición de la corrosión: Estudio de la habilidad del Poli(N-metilpirrol) para formar estructuras nanoestructuradas y la actuación de éstas como aditivo anticorrosivo en recubrimientos orgánicos. 2. Sustitución parcial del zinc metálico en polvo habitualmente empleado en pinturas de altas prestaciones, por una pequeña cantidad de CP: Estudio del uso de pequeñas concentraciones de polianilina sal emeraldina (PAni-EB), como sustituto parcial del zinc metálico en polvo, en pinturas de imprimación epoxi marinas, con el objetivo de mantener la inhibición a la corrosión. 3. Evaluación de pigmentos anticorrosivos amigables con el medio ambiente para pinturas de imprimación alquídicas: Estudio de la sustitución de una elevada concentración de fosfato de zinc, generalmente empleado en recubrimientos de suaves prestaciones, por una concentración muy baja de PAni-EB (forma no-dopada), PAni-ES (forma dopada) y un derivado del politiofeno (parcialmente dopado) en un recubrimiento alquídico, y el estudio de sus capacidades protectoras empleando ensayos de corrosión acelerados. 4. Preparación de una nueva pintura epoxi, basada en DMSO como disolvente ecológico y libre de pigmento anticorrosivo de zinc, y su aplicación para la protección de acero al carbono: Formulación y evaluación de una nueva pintura epoxi basada en DMSO como solvente y empleando PAni-EB y poli[2, 2’-(3-metilacetato)tiofeno] como nuevos pigmentos anticorrosivos. Todos los resultados obtenidos en la presente tesis han sido aceptados o han sido enviados para publicación en revistas internacionales; además, algunos resultados han sido divulgados recientemente en congresos internacionales, tal y como se describe abajo: 1. M. Martí, G. Fabregat, F. Estrany, C. Alemán, E. Armelin, “Nanostructured conducting polymer for dopamine detection”, J. Mater. Chem., 2010, 20, 10652-10660. 2. E. Armelin, M. Martí, F. Liesa, J.I. Iribarren, C. Alemán, “Partial replacement of metallic zinc dust in heavy duty protective coatings by conducting polymer”, Prog. Org. Coat., 2010, 69, 26-30. 3. M. Martí, G. Fabregat, D.S. Azambuja, C. Alemán, E. Armelin, “Evaluation of an environmentally friendly anticorrosive pigment for alkyd primer”, Prog. Org. Coat., 2012, 73, 321–329. 4. M. Martí, L. Molina, C. Alemán, E. Armelin, “Replacement of toxic solvents and anticorrosive pigments used in solvent-borne epoxy coatings by safer functional organic compounds”, enviado para publicación en Journal of Hazardous Materials, 2013. 5. M. Martí, E. Armelin, J. Iribarren, C. Alemán. Soluble polythiophenes as anticorrosive additives for marine epoxy paints”, enviado para publicación en Materials and Corrosion, 2013. 6. G. Fabregat, M. Martí, F. Estrany, C. Alemán, E. Armelin, E-MRS 2010 Spring Meeting. 2010, Strasbourg, France. 7. E. Armelin, M. Martí, F. Estrany, C. Alemán, 12th Mediterranean Congress of Chemical Engineering: shaping the future of chemical engineering. 2011, Barcelona, Spain.

  • POLIMEROS CONDUCTORES Y SUS DERIVADOS HIBRIDOS CON APLICACIONES AVANZADAS

     Estrany Coda, Francisco; Armelin Diggroc, Elaine; Zanuy Gomara, David; Iribarren Laco, Jose Ignacio; Sanchez Jimenez, Margarita; Aleman Llanso, Carlos Enrique
    Participation in a competitive project

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  • An electroactive and biologically responsive hybrid conjugate based on chemical similarity

     Fabregat Jove, Georgina; Ballano Ballano, María Gema; Armelin Diggroc, Elaine; Del Valle Mendoza, Luis Javier; Cativiela, Carlos; Aleman Llanso, Carlos Enrique
    Polymer Chemistry
    Date of publication: 2012-11-20
    Journal article

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    Synthetic amino acids have become very important tools for the design of new materials. In this work, an electroactive polymer¿amino acid hybrid material has been synthesized by conjugating poly(3,4-ethylenedioxythiophene) (PEDOT), a well known conducting polymer, with a synthetic amino acid bearing 3,4-ethylenedioxythiophene, which has been explicitly designed and prepared for such a purpose. Nanometric films have been electrochemically generated using a two-step procedure to evaluate the properties and potential applications of the resulting hybrid material. The successful incorporation of the amino acid as end-capping of the PEDOT chains has been proved by FTIR, energy dispersive X-ray and X-ray photoelectron spectroscopies. The fabrication of the hybrid material using an engineered tissue has allowed us to preserve not only morphological and structural characteristics of the conducting polymer but also, and most importantly, to preserve the electrical conductivity, electroactivity, electrochemical stability and specific capacitance. Finally, the behavior of the hybrid material as a cellular matrix has been compared with that of PEDOT using cellular adhesion and proliferation assays. Results obtained in this work represent the success of a new strategy for the preparation of peptide-conducting polymer hybrid materials, which is currently being improved upon by transforming the 3,4-ethylenedioxythiophene-containing amino acid into a cell adhesive peptide

  • Bioactive and electroactive response of flexible polythiophene:Polyester nanomembranes for tissue engineering

     Perez Madrigal, Maria Del Mar; Armelin Diggroc, Elaine; Del Valle Mendoza, Luis Javier; Estrany Coda, Francisco; Aleman Llanso, Carlos Enrique
    Polymer Chemistry
    Date of publication: 2012-04
    Journal article

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  • Controlling the morphology of poly(N -cyanoethylpyrrole)

     Fabregat Jove, Georgina; Aleman Llanso, Carlos Enrique; Casas Becerra, M. Teresa; Armelin Diggroc, Elaine
    Journal of physical chemistry B
    Date of publication: 2012-04-26
    Journal article

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    The morphology of poly(N-cyanoethylpyrrole) has been controlled through the polymerization process. This polymer has been prepared by anodic polymerization, chemical oxidative polymerization in emulsion medium, and layer-by-layer templating polymerization. Anodic polymerization using LiClO4 as supporting electrolyte provides compact films, in which the oxidation degree is controlled through the thickness, useful for the microdetection of dopamine. Chemical polymerization using FeCl3 as oxidant agent results in very well-defined microspheres with porous internal structure, which may be useful in molecular loading and transport processes. Finally, the layer-by-layer templating technique produces core−shell particles of controlled size and thickness. Moreover, these core−shell particles can be easily converted in hollow microspheres by removing the template

  • New Sulfonated Polystyrene and Styrene¿Ethylene/Butylene¿Styrene Block Copolymers for Applications in Electrodialysis

     Müller, Franciélli; Ferreira, Carlos Arthur; Franco Garcia, Maria Lourdes; Puiggali Bellalta, Jorge; Aleman Llanso, Carlos Enrique; Armelin Diggroc, Elaine
    Journal of physical chemistry B
    Date of publication: 2012-09
    Journal article

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  • Phosphonic acid/silica-based films: A potential treatment for corrosion protection

     Dalmoro, Viviane; dos Santos, João Henrique Zimnoch; Armelin Diggroc, Elaine; Aleman Llanso, Carlos Enrique; Azambuja, Denise S.
    Corrosion science
    Date of publication: 2012-07
    Journal article

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    Films of tetraethyl orthosilicate (TEOS) and 1,2-diaminoethanetetrakis methylenephosphonic acid (EDTPO) were evaluated as a anticorrosive treatment against corrosion for AA2024-T3 in a 0.05 mol L−1 NaCl solution. The electrochemical behavior was investigated using electrochemical impedance spectroscopy. The chemical composition of the silanization bath and films were analyzed by infrared spectroscopy. The effect of hydrolysis time on sol–gel TEOS/EDTPO was monitored, being obtained the best performance after 72 h of hydrolysis at 25 °C. The optimal concentration of EDTPO within the TEOS matrix was 3.75 × 10−4 mol L−1. Improved barrier properties of these films were achieved by the addition of silica nanoparticles.

  • Preparation and characterization of semiconducting polymeric blends. Photochemical synthesis of poly(3-alkylthiophenes) using host microporous matrices of poly(vinylidene fluoride)

     Gomes, Alex Linardi; Pinto Zakia, Maria Beny; Armelin Diggroc, Elaine; Filho, Jose Godoy; Aleman Llanso, Carlos Enrique; Sinezio De Carvalho Campos, Joao
    Polymer Chemistry
    Date of publication: 2012-05
    Journal article

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    Chemical and electrochemical synthesis techniques have been the principal methods of obtaining polymers in industry and scientific research laboratories. However, during the last two decades, photochemical synthesis, although poorly studied, has been reported to present several advantages, in that it is a fast and cheap technique, and it is not aggressive to the environment. The technique has been applied to the production of some conducting polymers. In this study, semiconducting polymeric blends composed of PT3AA-K¿PVDF and PT3MA¿PVDF were respectively obtained by photochemical polymerization in aqueous solutions of 3-thiophene acetic acid and 3-thiophene methyl acetate monomers using PVDF microporous matrices and potassium dichromate as catalyst. The percentage of products and by-products incorporated in the host matrix was obtained by gravimetric analysis. The chemical structures of the polymers synthesized were analyzed by FTIR, UV-vis and 1H NMR. GPC analysis indicated the formation of oligomers composed of 5¿6 mers. The morphology of the matrices and polymeric blends was observed by SEM-EDS and their electric behavior evaluated by measures of electric conductivity. The SEM images show the presence of polythiophene in the pores of the PVDF microporous membrane. The thermal properties of the polymers and their blends were evaluated by DSC and TGA. Thermal analysis by DSC demonstrated an increase in melting temperature of the blends, attributed to the confinement of PVDF crystalline phases for the polymer photosynthesized. The results of volumetric conductivity measurements of polymeric blends show an increase in conductivity in the matrices from 10-15 to 10-11 S cm-1.

  • Ultraporous poly(3,4-ethylenedioxythiophene) for nanometric electrochemical supercapacitor

     Aradilla Zapata, David; Estrany Coda, Francisco; Armelin Diggroc, Elaine; Aleman Llanso, Carlos Enrique
    Thin solid films
    Date of publication: 2012-04-30
    Journal article

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  • Evaluation of an environmentally friendly anticorrosive pigment for alkyd primer

     Martí Barroso, Mireia; Fabregat Jove, Georgina; Azambuja, Denise S.; Aleman Llanso, Carlos Enrique; Armelin Diggroc, Elaine
    Progress in organic coatings
    Date of publication: 2012-04
    Journal article

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    An alkyd formulation containing zinc phosphate (10 wt.%) was prepared and subsequently modified replacing the latter anticorrosive additive by a very low concentration of conducting polymer. Specifically, three modified paints, which contain polyaniline emeraldine base (undoped form), polyaniline emeraldine salt (doped form) and an eco-friendly polythiophene derivative (partially oxidized), were formulated. The properties and corrosion resistance of the four alkyd coatings have been characterized. Among the three modified paints, the one containing polythiophene shows the best adherence and the highest corrosion resistance. This has been attributed to the fact that the miscibility of the polythiophene derivative with the alkyd formulation is better than that of polyaniline. Furthermore, accelerated corrosion assays and electrochemical impedance spectroscopy measurements revealed that the corrosion resistance of the paint with polythiophene is several orders of magnitude higher than that with zinc phosphate. The polythiophene derivative has been found to induce the formation of a passivating and well-adhered layer between the coating and the surface, preventing the access of chloride anions and oxygen to the substrate.

  • Biodegradable free-standing nanomembranes of conducting polymer:polyester blends as bioactive platforms for tissue engineering

     Armelin Diggroc, Elaine; Gomes, Alex Linardi; Perez Madrigal, Maria Del Mar; Puiggali Bellalta, Jorge; Franco Garcia, Maria Lourdes; Del Valle Mendoza, Luis Javier; Rodriguez Galan, Rafael Alfonso; Campos, J.S.D.C.; Ferrer Anglada, Nuria; Aleman Llanso, Carlos Enrique
    Journal of materials chemistry B
    Date of publication: 2012-01-14
    Journal article

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  • Influencia de polímeros convencionais e condutor em membranas cátion-seletivas: Síntese e caracterizaçao

     Müller, Franciélli; Ferreira, Carlos Arthur; Armelin Diggroc, Elaine; Aleman Llanso, Carlos Enrique; Schramm, Juliana
    Congresso Brasileiro de Polímeros
    Presentation's date: 2011-10-16
    Presentation of work at congresses

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  • Microstructures of poly(N-methylpyrrole) and their interaction with morphine

     da Cruz Teixeira Dias, Bruno José; Aleman Llanso, Carlos Enrique; Estrany Coda, Francisco; Azambuja, Denise S.; Armelin Diggroc, Elaine
    Electrochimica acta
    Date of publication: 2011-06-30
    Journal article

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    Microstructures of poly(N-methylpyrrole) have been generated by direct electrochemical oxidation of N-methylpyrrole with poly(styrenesulfonic acid) in aqueous solution, using a micelle formation mechanism with gas bubble templates. These microstructures present a “doughnut”-like morphology with diameters ranging from 20 to 100μm. Other anionic surfactants, such as camphorsulfonic acid and β-naphthalenesulfonic acid, have been also employed, results evidencing that the morphology of the microstructures depends on the nature of the surfactant electrolytes. The dimensions, abundance and texture of the microstructures have been modulated by varying the surfactant molecules, the electrochemical technique, and the distance between the working and counter-electrode. The generated microstructures have been characterized using electrochemical techniques, Raman and infrared spectroscopies, scanning electron microscopy and atomic force microscopy. Hollow microstructures-containing films made of poly(N-ethylpyrrole)/poly(styrenesulfonic acid), which present remarkable electroactivity and electrostability, has been proved to interact with morphine molecules. Thus, systems based on this prominent material show a high ability to capture the drug molecules and to retain them for a long period of time.

  • Ultrathin Films of Polypyrrole Derivatives for Dopamine Detection

     Fabregat Jove, Georgina; Cordova Mateo, Ester; Armelin Diggroc, Elaine; Bertran Cànovas, Oscar; Aleman Llanso, Carlos Enrique
    The journal of physical chemistry. Part C, nanomaterials and interfaces
    Date of publication: 2011-08-04
    Journal article

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  • Avances tecnológicos en la detección de neurotransmisores

     Bertran Cànovas, Oscar; Fabregat Jove, Georgina; Cordova Mateo, Ester; Armelin Diggroc, Elaine; Aleman Llanso, Carlos Enrique
    Química e industria (Madrid)
    Date of publication: 2011-06-01
    Journal article

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    La combinación de los resultados que proporcionan los experimentos realizados en el laboratorio y el ordenador es una de las claves para conseguir avances científicos importantes en la investigación de la química aplicada del siglo XXI. En este trabajo se presenta, en síntesis, cómo la combinación de técnicas electroanalíticas y de simulación molecular ha permitido diseñar detectores de dopamina, un neurotransmisor que afecta a las funciones motoras y cognitivas, en concentraciones similares a las que se encuentran en las sinapsis neuronales

  • Application of conducting polymers in nanobiotechnology

     Da Cruz teixeira dias, Bruno José
    Defense's date: 2011-10-28
    Department of Chemical Engineering, Universitat Politècnica de Catalunya
    Theses

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  • New biodegradable poly(ester amide)s: study of polymerization, crystallization and degradation processes

     Botines Mas, Maria Emma
    Defense's date: 2011-09-30
    Department of Chemical Engineering, Universitat Politècnica de Catalunya
    Theses

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  • Electronic properties of poly(thiophene-3-methyl acetate)  Open access

     Gomes, Alex Linardi; Casanovas, Jordi; Bertran Cànovas, Oscar; Sinezio de Campos, Joao; Armelin Diggroc, Elaine; Aleman Llanso, Carlos Enrique
    Journal of polymer research
    Date of publication: 2011-11-04
    Journal article

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    The electronic structure of poly(thiophene-3- methyl acetate) has been investigated using UV–vis absorption spectroscopy and quantum mechanical calculations. Experimental measures in chloroform solution indicate that the π-conjugation length increases with the polymer concentration, which is reflected by the red shift of the absorbance peak of the π-π* transition. On the other hand, the energy required for the π-π* transition has been found to decrease with the volatility of the solvent for concentrated polymer solutions, even though the influence of the solvent is very small for dilute solutions. Quantum mechanical calculations indicate that the interactions between the π-conjugated backbone and the methyl acetate side groups are very weak. On the other hand, the lowest energy transition predicted for an infinite polymer chain that adopts the anti-gauche and all-anti conformations is 2.8 and 1.9 eV, respectively. Finally, measurements on spincasted nanofilms reflect that the π-π* transition energy increases with the thickness, which has been attributed to the distortion of the molecular conformation. In spite of this, the energy gap obtained for the thinnest film (1.52 eV) is significantly smaller than that determined for dilute and concentrated chloroform solutions (2.56 and 2.09 eV, respectively)

  • ENVIRONMENTAL ANTI-CORROSIVE ADDITIVES BASED ON POLY(ALKYL THIOPHENE ACETATES) EASILY DISPERSIBLE IN PRIMING PAINTS FOR METAL SURFACES

     Armelin Diggroc, Elaine; Aleman Llanso, Carlos Enrique; Iribarren Laco, Jose Ignacio; Liesa Mestres, Francisco; Estrany Coda, Francisco
    Date of request: 2011-10-25
    Invention patent

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  • Nanostructured conducting polymer for dopamine detection

     Martí Barroso, Mireia; Fabregat Jove, Georgina; Estrany Coda, Francisco; Aleman Llanso, Carlos Enrique; Armelin Diggroc, Elaine
    Journal of materials chemistry B
    Date of publication: 2010
    Journal article

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  • Access to the full text
    Transport of Metallic Ions through Polyaniline-containing composite membranes  Open access

     Ferreira, Carlos Arthur; Casanovas, Jordi; Rodrigues, Marco A. S.; Müller, Franciélli; Armelin Diggroc, Elaine; Aleman Llanso, Carlos Enrique
    Journal of chemical and engineering data
    Date of publication: 2010-09-30
    Journal article

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    The extraction of Na+, Ni2+, and Cr3+ using six different membranes made of polyaniline composited with high-impact polystyrene, which differ in the doping agent and/or the preparation method, has been investigated. The swelling and ion-exchange capacities of the six polyaniline composited with high-impact polysterene (HIPS/PAni) membranes have been determined and compared with that of the commercial Selemion membrane. Electrodialysis tests using a five-compartment cell evidenced that the extraction of ions depends on the electronic structure of the SO3 - groups, which is modulated by the doping agent, and on both microstructure and electrical resistance of the membrane, which are regulated by the preparation method. The transport of ions through HIPS/PAni and Selemion membranes was found to be comparable. Quantum mechanical calculations on model complexes have been performed to characterize the electronic structure of the dopants. Results indicate that the strength of the interaction between the different doping agents and the polyaniline is inversely proportional to the concentration of negative charge in the SO3 - group of the former. Moreover, both the binding energy and the distribution of charges calculated for dopant · · · PAni complexes have been compared with those predicted for dopant · · · metallic ion complexes.

  • Characterization and Properties of Poly[N-(2-cyanoethyl)pyrrole]

     Aradilla Zapata, David; Estrany Coda, Francisco; Armelin Diggroc, Elaine; Oliver, R.; Iribarren Laco, Jose Ignacio; Aleman Llanso, Carlos Enrique
    Macromolecular chemistry and physics
    Date of publication: 2010-08-02
    Journal article

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  • Partial replacement of metallic zinc dust in heavy duty protective coatings by conducting polymer

     Armelin Diggroc, Elaine; Martí Barroso, Mireia; Liesa Mestres, Francisco; Iribarren Laco, Jose Ignacio; Aleman Llanso, Carlos Enrique
    Progress in organic coatings
    Date of publication: 2010-09
    Journal article

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    The aim of this work is to show that the high concentration of metallic zinc dust typically used in marine epoxy primers may be reduced by introducing a small concentration of conducting polymer as auxiliary anticorrosive additive. Specifically, in this work we compare the protection imparted by an epoxy coating with 79 wt.% of anticorrosive pigment with that obtained using the same formulation but reducing such concentration to 60 wt.% and adding 0.3 wt.% of polyaniline emeraldine salt. Initially, the influence of this modification in the structural, thermal and mechanical properties of the coating has been examined. After this, accelerated corrosion assays in an aggressive solution medium have been developed. The protection imparted by the unmodified and modified paint formulations has been determined using the standard method ASTM D 1654-79.

  • Influence of the doping level on the interactions between poly(3,4-ethylenedioxythiophene) and plasmid DNA

     da Cruz Teixeira Dias, Bruno José; Zanuy Gomara, David; Del Valle Mendoza, Luis Javier; Estrany Coda, Francisco; Armelin Diggroc, Elaine; Aleman Llanso, Carlos Enrique
    Macromolecular chemistry and physics
    Date of publication: 2010-05-17
    Journal article

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    The influence of the doping level in the formation of specific interactions between plasmid DNA and PEDOT is investigated using experimental assays and theoretical calculations. Electrochemical methods are used to prepare polymer samples with oxidation degrees ranging from 0.14 to 1.05 positive charges per repeating unit. A combination of experimental and theoretical results are used to propose a mechanism for the formation of DNA/conducting polymer complexes, which consists of the initial stabilization of the adducts through non-specific interactions followed by small structural re-arrangements that allow to be established specific hydrogen bonds involving the polar groups of the conducting polymer and selected DNA bases.

  • Morphology and growing of nanometric multilayered films formed by alternated layers of poly(3,4-ethylenedioxythiophene) and poly(N-methylpyrrole)

     Aradilla Zapata, David; Estrany Coda, Francisco; Armelin Diggroc, Elaine; Aleman Llanso, Carlos Enrique
    Thin solid films
    Date of publication: 2010-05-31
    Journal article

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  • Poly(2-thiophene-3-yl-malonic acid), a Polythiophene with Two Carboxylic Acids Per Repeating Unit

     Bertran Cànovas, Oscar; Armelin Diggroc, Elaine; Estrany Coda, Francisco; Gomes, Alex Linardi; Torras Costa, Juan; Aleman Llanso, Carlos Enrique
    Journal of physical chemistry B
    Date of publication: 2010-04-22
    Journal article

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    A new substituted polythiophene derivative bearing malonic acid, poly(2-thiophen-3-yl-malonic acid), has been prepared and characterized using a strategy that combines both experimental and theoretical methodologies. The chemical structure of this material has been investigated using FTIR and 1H NMR, and its molecular conformation has been determined using quantum mechanical calculations. Interestingly, the arrangement of the inter-ring dihedral angles was found to depend on the ionization degree of the material, that is, on the pH, which has been found completely soluble in aqueous base solution. Thus, the preferred anti-gauche conformation changes to syn-gauche when the negatively charged carboxylate groups transforms into neutral carboxylic acid. UV−vis experiments and quantum mechanical calculations on model systems with a head-to-tail regiochemistry showed that the lowest π−π* transition energy is 2.25 and 2.39 eV for the negatively charged and the neutral polymer, respectively. These values are slightly larger than those previously reported for other polythiophenes with bulky polar side groups. The polymer presents a good thermal stability with a decomposition temperature above 215 °C and an electrical conductivity of 10−5 S/cm, which is characteristic of semiconductor materials. Scanning electron microscopy micrographs showed that, after doping, the surface of this material displays regular distribution pores with irregular sizes. This surface suggests that poly(2-thiophen-3-yl-malonic acid) is a candidate for potential applications such as selective membranes for electrodialysis, wastewater treatment, or ion-selective membranes for biomedical uses.

  • APLICACIONES DE LOS POLÍMEROS CONDUCTORES EN INGENIERÍA Y BIOTECNOLOGÍA

     Bertran Cànovas, Oscar; Torras Costa, Juan; Estrany Coda, Francisco; Armelin Diggroc, Elaine; Iribarren Laco, Jose Ignacio; Liesa Mestres, Francisco; Zanuy Gomara, David; Revilla Lopez, Guillermo; Canales Gabriel, Manel; Aleman Llanso, Carlos Enrique
    Participation in a competitive project

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  • Anticorrosion performances of epoxy coatings modified with polyaniline: A comparison between the emeraldine base and salt forms

     Armelin Diggroc, Elaine; Aleman Llanso, Carlos Enrique; Iribarren Laco, Jose Ignacio
    Progress in organic coatings
    Date of publication: 2009-04
    Journal article

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  • A comprehensive study of the interactions between DNA and poly(3,4-ethylenedioxythiophene)

     Aleman Llanso, Carlos Enrique; da Cruz Teixeira Dias, Bruno José; Zanuy Gomara, David; Estrany Coda, Francisco; Armelin Diggroc, Elaine; Del Valle Mendoza, Luis Javier
    Polymer
    Date of publication: 2009-04
    Journal article

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  • Polyaniline, polypyrrole and poly(3,4-ethylenedioxythiophene) as additives of organic coatings to prevent corrosion

     Armelin Diggroc, Elaine; Meneguzzi, Alvaro; Ferreira, Carlos Arthur; Aleman Llanso, Carlos Enrique
    Surface and coatings technology
    Date of publication: 2009-09
    Journal article

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  • Characterization and properties of a polythiophene with a malonic acid dimethyl ester side group

     Armelin Diggroc, Elaine; Bertran Cànovas, Oscar; Estrany Coda, Francisco; Salvatella, Roser; Aleman Llanso, Carlos Enrique
    European polymer journal
    Date of publication: 2009-05-27
    Journal article

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  • PC-ProTec, pintures anticorrosives basades en Polímers Conductors

     Armelin Diggroc, Elaine; Aleman Llanso, Carlos Enrique; Iribarren Laco, Jose Ignacio; Mateos Bueno, Maria Carmen
    Participation in a competitive project

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  • INNOVACIO, MODELITZACIÓ I ENGINYERIA EN BIOMATERIALES (IMEM)

     Liesa Mestres, Francisco; Torras Costa, Juan; Bertran Cànovas, Oscar; Estrany Coda, Francisco; Zanuy Gomara, David; Armelin Diggroc, Elaine; Iribarren Laco, Jose Ignacio; Revilla Lopez, Guillermo; Aleman Llanso, Carlos Enrique
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  • Poly(3-alkylthiophene)s as anticorrosive additive for paints: influence of the main chain stereoregularity

     Iribarren Laco, Jose Ignacio; Ocampo Cruelles, Cintia; Armelin Diggroc, Elaine; Liesa Mestres, Francisco; Aleman Llanso, Carlos Enrique
    Journal of applied polymer science
    Date of publication: 2008-03
    Journal article

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  • Corrosion protection with polyaniline and polypyrrole as anticorrosive additives for epoxy paint

     Armelin Diggroc, Elaine; Rosa, Pla; Liesa Mestres, Francisco; Ramis Juan, Xavier; Iribarren Laco, Jose Ignacio; Aleman Llanso, Carlos Enrique
    Corrosion science
    Date of publication: 2008-03
    Journal article

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  • Cross-linking in polypyrrole and poly(N-methylpyrrole): comparative experimental and theoretical studies

     Aleman Llanso, Carlos Enrique; Casanovas, J; Torras Costa, Juan; Bertran Cànovas, Oscar; Armelin Diggroc, Elaine; Oliver Pujol, Ramon; Estrany Coda, Francisco
    Polymer
    Date of publication: 2008-02
    Journal article

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  • Properties of nanometric and submicrometric multilayered films of poly(3,4-ethylenedioxythiophene) and poly(N-methylpyrrole)

     Estrany Coda, Francisco; Aradilla Zapata, David; Oliver Pujol, Ramon; Armelin Diggroc, Elaine; Aleman Llanso, Carlos Enrique
    European polymer journal
    Date of publication: 2008-05
    Journal article

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  • Structural and electronic properties of poly(3-thiophen-3-yl-acrylic acid)

     Bertran Cànovas, Oscar; Armelin Diggroc, Elaine; Torras Costa, Juan; Estrany Coda, Francisco; Mireia, Codina; Aleman Llanso, Carlos Enrique
    Polymer
    Date of publication: 2008-04
    Journal article

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  • Hydrogen bonding interactions in 2-thiophen-2-ylmalonic acid

     Casanovas, Jordi; Bertran Cànovas, Oscar; Armelin Diggroc, Elaine; Torras Costa, Juan; Estrany Coda, Francisco; Aleman Llanso, Carlos Enrique
    Journal of physical chemistry A
    Date of publication: 2008-10
    Journal article

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  • Cellular adhesion, proliferation and viability on conducting polymer substrates

     Valle, Luis J Del; Estrany Coda, Francisco; Armelin Diggroc, Elaine; Oliver Pujol, Ramon; Aleman Llanso, Carlos Enrique
    Macromolecular bioscience
    Date of publication: 2008-12
    Journal article

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  • Copolymers of pyrrole and N-(hydroxypropyl)pyrrole: properties and interactions with DNA

     Pfeiffer, P; Armelin Diggroc, Elaine; Estrany Coda, Francisco; Del Valle Mendoza, Luis Javier; Yao, C L; Aleman Llanso, Carlos Enrique
    Journal of polymer research
    Date of publication: 2008-06
    Journal article

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  • Specific interactions in complexes formed by polythiophene derivatives bearing polar side groups and plasmid DNA

     da Cruz Teixeira Dias, Bruno José; Valle, Luis J Del; Estrany Coda, Francisco; Armelin Diggroc, Elaine; Oliver Pujol, Ramon; Aleman Llanso, Carlos Enrique
    European polymer journal
    Date of publication: 2008-11
    Journal article

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  • APLICACIONES TECNOLÓGICAS DE POLÍMEROS CONDUCTORES ELECTROACTIVOS

     Aleman Llanso, Carlos Enrique; Armelin Diggroc, Elaine
    Participation in a competitive project

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