Pan American Materials Congress: Materials for Green Energy: Poster Session
Sponsored by: Third Pan American Materials Congress Organizing Committee
Program Organizers: Ramalinga Viswanathan Mangalaraja, University of Concepcion; Hector Calderon, ESFM-IPN; Julie Schoenung, University of California, Irvine; Roberto Arce, SAM - Soc. Argentina de Materiales

Tuesday 5:30 PM
February 28, 2017
Room: Poster Area
Location: Marriott Marquis Hotel

PAN-14: Extrusion and Flash Sintering of Nickel Oxide-Samarium Doped Ceria (NIO-SDC) Nanostructure Composite Microtubular Anodes for Solid Oxide Fuel Cells: Ramalinga Viswanathan Mangalaraja1; Jonathan Usuba1; Hernán Valle1; Jorge Durango1; Marta Lopez1; Chan Siew Hwa2; 1University of Concepcion; 2Nanyang Technological University
    Extrusion is a low cost ceramic processing method used to fabricate micro tubular solid oxide fuel cells (SOFCs). Electric field assisted flash-sintering has been attracted recently as a fascinating approach to obtain highly crystalline and dense or porous ceramic materials within few seconds. In the present work, we have applied the flash sintering mechanism for nickel oxide-samarium doped ceria (NiO-SDC) porous anode microtubes fabricated by extrusion technique, at different temperatures under various DC electric fields. It was observed that the effect of power density and the evolution of brightness on the sinterization of anode under constant electric field depends mainly on the applied current. Furthermore, the temperature for the onset of flash sintering varies from one materials to another and also depends on the contact area between the particles which change with particle size, porosity and homogenity.

PAN-15: Green Extract of Mate Tea as Corrosion Inhibitor of Copper and Aluminum: Ana Derna1; Claudia Méndez2; Liliana Gassa3; Alicia Ares4; 1FCEQyN-UNaM; 2IMAM (CONICET-UNaM); 3INIFTA; 4CONICET/FCEQyN-UNaM
     Many of the corrosion inhibitors used are expensive and toxic so the current trend is to study compounds that are environmentally friendly and efficient. Inhibitors are easy to use and they have the additional advantage that can be applied in situ and without causing significant disruption in the process.In the present work we investigated the influence of the aqueous extract of yerba mate as corrosion inhibitor of copper and aluminum in 0,5 M NaCl and 1 M HCl solutions , using different electrochemical techniques. The following inhibition efficiencies: 56% for copper in 0,5 M NaCl with 25% concentration of extract, 17% for copper in 1 M HCl with 5% concentration of extract, and 99% for aluminum in 0,5 M NaCl for 1% concentration of extract were obtained by potentiodynamic polarization.

PAN-16: Heat Capacity and Thermal Expansion of Solar Salts Determined by Thermal Analysis Techniques: Ekkehard Post1; 1NETZSCH Geraetebau GmbH
    Promising solar heat storage materials are inorganic salts with solid liquid phase transitions in the temperature range 150 to 400°C and high melting enthalpies. These phase change materials (PCM) are often binary or ternary mixtures of alkali salts. Their advantages are medium and adjustable melting temperatures, reasonable energetic properties, availability and being inexpensive. But, problems can occur with corrosion of the container material and chemical stability of the substances itself. Finally some of the physical properties are not available or not accurate over the whole temperature range, especially for mixtures or new materials during melting or in the melt. This contribution will show heat capacity measurement results as well as the temperature dependent density of some solar salts into the molten region.

PAN-17: Influence of Organic Solvent on Pt Nanoparticles Synthesis on MWCNT for ORR: Carolina Silva Carrillo1; Edgar Reynoso-Soto1; Rosa-Maria Felix Navarro1; Balter Trujillo-Navarrete1; Jose Chavez-Carvayar2; Francisco Paraguay-Delgado3; Gabriel Alonso-Nuñez4; 1Instituto Tecnologico de Tijuana; 2Instituto de Investigacion En Materiales, Universidad Nacional Autonoma de Mexico; 3Centro de Investigacion de Materiales Avanzados; 4Centro de Nanociencia Y Nanotecnologia, Universidad Autonoma de Mexico
    It has been a great challenge establish efficient synthesis methods for obtaining a good catalyst of Pt nanoparticles on MWCNT for cathode of fuel cell, because it is necessary control different aspects of the material. The reverse microemulsions a good option, this method consist it’s a colloidal dispersion of water in organic solvent is stabilized by a surfactant film. The water pool in the microemulsion solubilizes the reactants and provides the stage where the reaction occurs. The rate of exchange of reactants in this system depends on the viscosity of the organic solvent which controls the collision of the micelles.In this work is presented the effect of structure and viscosity of organic solvent like hexane, ciclohexene and iso-octane in the control of shape, size number of particles and the dispersion of Pt nanoparticles on MWCNT. Acquired different characteristics of nanomaterials control the activity and mechanism in the oxygen reduction reaction

PAN-18: One-pot “Green” Synthesis of Nitrogen Doped Porous Titania Nanospheres for Photocatalytic Degradation of Direct Blue-71: Nalandhiran Pugazhenthiran1; Panneerselvam Sathishkumar2; Ramalinga Mangalaraja1; Sambandam Anandan3; Sepperumal Murugesan4; 1University of Concepcion; 2 University of Concepcion; 3National Institute of Technology - Trichy; 4Madurai Kamaraj University
    Severe harmful effects posed by the presence of dyestuff in water resources worldwide drive the development of an innovative and practical water treatment technology with great urgency. With an interest to keep the environment safe and pollution-free, nitrogen doped porous titania nanospheres with anatase phase have been synthesized by a one-pot “green” synthetic approach. The physicochemical properties of the prepared catalyst were studied through X-ray diffraction, N2 adsorption-desorption isotherms, scanning electron microscopy and diffuse reflectance spectroscopy techniques. The prepared photocatalyst exhibits excellent photocatalytic activity compared to that of commercial TiO2 in the presence of direct sunlight towards the degradation of commonly used triazo dye Direct Blue 71. The efficient activity can be attributed to the large surface area and pore volume of the catalyst. This study implies a strong possibility for the remediation of contaminated water containing dyestuff toxins through photocatalytic oxidation using solar light, as sustainable source of energy.

PAN-19: Plasmon-enhanced Solar Fuel Production with Gold-metal Oxide Hybrid Nanomaterials: Christian Engelbrekt1; Matt Law2; Jingdong Zhang1; 1Technical University of Denmark; 2University of California Irvine
    Sunlight from nature to drive chemical reactions for energy storage provides an important approach in the transition towards green and sustainable technologies. Solar fuel production using semiconductor nanoparticles (SNPs) has been widely studied but suffer from poor utilization of the solar spectrum and/or poor stability under operating conditions. A new avenue addressing these challenges involves plasmonic metal nanoparticles (PNPs). These stable materials have tunable optical properties and exciting catalytic behavior. Composite photocatalysts of SNPs and PNPs exploit the majority of the solar spectrum, provide new catalytic routes and expands the scope of solar photocatalysis. We prepare metal oxide SNPs (e.g. ZnO, CuxO), gold PNPs and their hybrids through mild aqueous syntheses to develop efficient photocatalyst for solar fuel production. Focus is placed on the synergetic interplay between SNPs and PNPs, understanding the complex pathways, and disentangling plasmon-driven, photothermal and heterogenous catalytic effects.

PAN-20: Platinum Salts Synthesis as Precursors to Get Heterogeneous Catalysts for Biofuels Production: Adriana Martínez1; Sherly Acosta2; Jonathan Sierra2; Carlos Guerrero2; 1Universidad Nacional de Colombia ; 2Universidad Nacional de Colombia
    The trend in the industry is aimed at developing sustainable processes currently, among them, the search for alternative fuels such as biofuels, which are the best alternative to replace fossil fuels but they are not yet economically competitive. This research shows a chemical route for the synthesis of tetraamineplatinum (II) chloride salt which needs several stages. The yield of each production step was evaluate through platinum determination by atomic absorption and each product was characterized by XRD, IR, UV-Vis spectrophotometry, TGA and XRF analyses. Taking into account that the overall yield to tetraamineplatinum (II) chloride was of 62.18% and a pilot plant was proposed and evaluated. This salt is used in the preparation of precursors for catalysts supported on structured pore size allowing impregnation of catalytic species and promote the transfer of materials triglyceride molecules, as well as the evaluation of the scaling up of this process to industrial scale.

PAN-21: Structural and Magnetic Properties of Nano Cobalt Ferrites for Green Refrigeration Technology: Prabhakaran Thandapani1; Mangalaraja R.V2; 1 University of Concepcion; 2University of Concepcion
    Nano cobalt ferrites were synthesized through co-precipitation method at reaction temperatures of 40 and 85°C for 1 hour by maintaining 0.84 M of NaOH solution. As-prepared nanoferrites particles were calcinated at 500 and 800°C for 2 hours in air. The structural analysis confirmed that the nanoferrites obtained in both reaction temperatures were highly crystalline and exhibited characteristic vibrations near 390 to 600 cm<-1> which varied with particle size. TEM and EDX analyses conveyed that the nano cobalt ferrites were of nearly spherical with uniform size distribution and exact stoichiometry ratio 1:2 (Co: Fe), respectively. Saturation magnetization of the nano cobalt ferrites increased with particles size. The correlation between cation distribution and magnetism were discussed. The properties of nano ferrites were effectively tuned by controlling their particle size, and divalent and trivalent cation distribution in tetrahedral (A) and octahedral (B) sublattices, respectively, which will be suitable for magnetic refrigeration technology.

PAN-22: Structural and Optical Properties of Graphene-based Nano-architectures Decorated with (Ag, Cu) Metal Nanoparticles: Udayabhaskar Rednam1; Mangalaraja R. V.1; Pandiyarajan Thangaraj1; Karthikeyan B2; 1University of Concepsion; 2National Institute of Technology, Trichy
    Graphite is the less expensive and most readily available source for the synthesis of graphene. Chemical oxidation of graphite produces electrically insulating graphene oxide (GO). By using chemical reduction this insulting GO will be converted to conducting graphene with the use of hazardous chemicals which will affect the quality of the materials and environment. We report a simple and easy method to synthesize graphene decorated with metal (Ag, Cu) nanoparticles. The key merit of this method is to achieve the rGO-metal nanocomposites from GO without the using toxic materials. The structural and optical properties of the prepared nanocomposites are analyzed using the XRD, FTIR and UV-abs. spectroscopic measurements. Optical absorption measurements exhibits absorption bands related to graphene and surface plasmon resonance (SPR) of metal nanoparticles.The catalytic capability of the prepared materials is evaluated by considering the reduction of dye with NaBH4 as a model system.

PAN-23: Synthesis of Mesoporous TiO2 for Photo-anode in Dye-synthetized Solar Cell: Victor Gonzalez1; Edgar Reynoso1; Balter Trujillo1; Rosa Felix1; 1Instituto Tecnologico de Tijuana
    Nowadays exists the need to develop new materials for the generation of green, clean and sustainable energy. One of these alternatives is to use the solar energy, through the design and application of new materials for the construction of photoelectrode of dye-synthetized solar cells (DSSC). In this work, we report the study of the temperature variation in the synthesis of mesoporous TiO2 via hydrothermal method used like photo-anode. The materials were characterized by X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), Raman, BET, UV–vis spectrometry, electrochemical impedance, and photo-current tests. The highest photo-convertion efficiency (ƞ) was 6.43% corresponding to a pore size of 6.8 nm and a surface area of 170 m2g-1 by comparison to a 5.76% of 9.8 nm and 125 m2g-1 .These performance results showed a dependence of the pore size and the superficial area in the uptake of dye, which improves the current density.

PAN-24: Tape Casting and Flash Sintering of Nickel Oxide-Gadolinium Doped Ceria (NIO-GDC) Nanostructure Composite Anode for Solid Oxide Fuel Cells: Jonathan Usuba1; Mangalaraja Ramalinga Viswanathan1; Miguel Niño1; Jorge Durango1; Marta Lopez1; Chan Siew Hwa2; 1Universidad de Concepción; 2Nanyang Technological University
    Tape casting is a ceramic processing method used to fabricate low-cost SOFC components such as electrolytes and electrodes. Electric field assisted flash-sintering has been attracted recently as a fascinating approach to obtain highly crystalline and dense or porous ceramic materials within few seconds. In the present work, we have applied the flash sintering mechanism for nickel oxide-gadolinium doped ceria (NiO-GDC) porous anode fabricated by Tape Casting, at different temperatures under various DC electric fields. It can be concluded that the electric field influences on the temperature at which the flash sintering occurs and the microstructure with high degree of porosity or densification required to select suitable current density. Furthermore, the temperature for the onset of flash sintering varies from one materials to another and also depends on the contact area between the particles which changes with particle size, porosity and inhomogenity.