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Bactericidal Potential of Titania and Silver Nano Powders Deposited in Porous Ceramic Substrates for Low-power Water Purification Reactors

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materials Today: Proceedings 2015年第1期2卷 242-245页

作者： Ilder B. Santos Wilson Acchar Joel N. Goncalves Ana M. Segadães Post-graduation Program on Materials Science and Engineering Federal University of Rio Grande do Norte 59072-970 Natal-RN Brazil Department of Materials and Ceramics Engineering (CICECO) University of Aveiro 3810-193 Aveiro Portugal

In this work, the joint photocatalytical and bactericidal potential, under UV radiation, of titania and silver nano powders dispersed in PMMA and deposited on porous ceramic substrates (40 and 80 ppi) by dip- and spray-coating, were investigated in low power consumption water purification reactors, using the Escherichia coli (E. coli) as reference pathogen. The results show the effect of different reactor morphologies (porosity, permeability, mechanical strength) on the bactericidal efficiency.

关键词： Nano powder Photocatalysis E. coli Water purification Porous ceramic.

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Graphene-Iike nanostructures obtained from biomass

Graphene-Iike nanostructures obtained from biomass

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2012 MRS Fall Meeting

作者： Barin, Gabriela Bonn Santos, Yane Honorato Rocha, Jennyfer Alves Da Costa, Luiz Pereira Filho, Antônio Gomes Souza De Fátima Gimenez, Iara Barreto, Ledjane Silva Pos-graduation Program of Science and Materials Engineering Federal University of Sergipe Marechal Rondon Ave São Cristóvão 49000-100 Brazil Department of Chemistry Federal University of Sergipe Marechal Rondon Ave São Cristóvão 49000-100 Brazil Pos Graduation Program of Industrial Biotechnology Tiradentes University Aracaju Brazil Department of Physic Federal University of Ceara Fortaleza Ceará Brazil

ISBN: (纸本)9781632660985

Two dimensional (2D) carbon nanomaterials such as few graphite layers or graphene are extensively studied due to their unique properties suitable to be exploiting in a wide range of technological applications. Recently, the growth of high quality graphene monolayers using insects and waste as carbon precursors was reported in the literature. This methodology opened a new way to convert the waste carbon into a high-value-added product. In the present work coconut coir dust, an agroindustrial biomass, was used as biotemplate for preparing carbonaceous materials. Carbon structures were synthesized through pyrolysis under nitrogen atmosphere (lOOmL/min) at 500, 1000, and 1500°C during 2 hours. Starting materials were coconut coir dust in natura and coconut coir dust hydrothermally treated. The samples were characterized by X-ray diffraction, Raman Spectroscopy, Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). Raman spectra showed the D band for all samples, related to the presence of defects in sp2 carbon structure and G band, indicative of graphite crystallites. It was also observed that the sample carbonized at 1500°C from coconut coir dust treated by hydrothermal method showed G' band at 2685cm-1 associated with the stacking order along the c-axis. X-ray diffraction analysis showed a broad peak around 2θ= 22° related to the presence of amorphous carbon. By increasing the pyrolysis temperature changes in XRD diffractograms were observed and the sample which was pyrolysed at 1500°C from coconut coir dust hydrothermally treated showed peaks at 28= 26.5°, 43° e 45° assigned to (002), (100) (101) graphite plans, respectively. Scanning electron microscopy images showed the presence of overlapping sheets and plates. Transmission Electron Microscopy (TEM) images of coconut coir dust in natura unveiled the formation of amorphous sheet. Coconut coir dust in natura and treated by the hydrothermal method pyrolysed at 1500°C, lead to the formation of

关键词： Graphene

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Graphene-like nanostructures obtained from Biomass

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MRS Online Proceedings Library 2013年第1期1505卷 1-6页

作者： Borin Barin, Gabriela Honorato Santos, Yane Alves Rocha, Jennyfer Pereira da Costa, Luiz Gomes Souza Filho, Antônio de Fátima Gimenez, Iara Silva Barreto, Ledjane Pos-graduation Program of Science and Materials Engineering Federal University of Sergipe São Cristóvão Brazil Department of Chemistry Federal University of Sergipe São Cristóvão Brazil Pos Graduation Program of Industrial Biotechnology Tiradentes University Aracaju Brazil Department of Physic Federal University of Ceara Ceará USA

Two dimensional (2D) carbon nanomaterials such as few graphite layers or graphene are extensively studied due to their unique properties suitable to be exploiting in a wide range of technological applications. Recently, the growth of high quality graphene monolayers using insects and waste as carbon precursors was reported in the literature. This methodology opened a new way to convert the waste carbon into a high-value-added product. In the present work coconut coir dust, an agroindustrial biomass, was used as biotemplate for preparing carbonaceous materials. Carbon structures were synthesized through pyrolysis under nitrogen atmosphere (100mL/min) at 500, 1000, and 1500°C during 2 hours. Starting materials were coconut coir dust in natura and coconut coir dust hydrothermally treated. The samples were characterized by X-ray diffraction, Raman Spectroscopy, Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). Raman spectra showed the D band for all samples, related to the presence of defects in sp2 carbon structure and G band, indicative of graphite crystallites. It was also observed that the sample carbonized at 1500°C from coconut coir dust treated by hydrothermal method showed G’ band at 2685cm-1 associated with the stacking order along the c-axis. X-ray diffraction analysis showed a broad peak around 2θ= 22° related to the presence of amorphous carbon. By increasing the pyrolysis temperature changes in XRD diffractograms were observed and the sample which was pyrolysed at 1500°C from coconut coir dust hydrothermally treated showed peaks at 2θ= 26.5°, 43° e 45° assigned to (002), (100) (101) graphite plans, respectively. Scanning electron microscopy images showed the presence of overlapping sheets and plates. Transmission Electron Microscopy (TEM) images of coconut coir dust in natura unveiled the formation of amorphous sheet. Coconut coir dust in natura and treated by the hydrothermal method pyrolysed at 1500°C, lead to the formation of

关键词： carbonization hydrothermal nanostructure

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Consolidation of the Cu46Zr42Al7Y 5 amorphous ribbons and powder alloy by hot extrusion

Consolidation of the Cu46Zr42Al7Y 5 amorphous ribbons and po...

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作者： Melle, Ana Karla Peres, Mauricio Mhirdaui Bolfarini, Claudemiro Botta, Walter José Jorge Jr., Alberto Moreira Kiminami, Claudio Shyinti Science and Materials Engineering Post Graduation Program Department of Materials Engineering Federal University of São Carlos - UFSCar Rod. Washington Luiz Km 235 CEP 13565-905 São Carlos SP Brazil Federal University of Itajubá - UNIFEI Rua São Paulo 377 CEP 37500 903 Itabira MG Brazil

The amorphous Cu46Zr42Al7Y5 alloy presents large supercooled liquid region (ΔTX = 100 K), with a viscosity of about 106 N.s/m2 where the material can flow as a liquid, making it possible an easy deformation in this temperature region. The aim of this work was to analyze processing routes to produce bulks of metallic glasses. Two kinds of materials were used: amorphous powders and ribbons, both were consolidated by hot extrusion in temperatures inside the range between Tg and Tx, with a ram speed of 1 mm/min and extrusion ratio of 3 : 1. Analysis of X-Ray Diffratometry (XRD), Differential Scanning Calorimetry (DSC) and Scanning Electron Microscopy (SEM), revealed that the proposed consolidation routes were effective to produce large bulks of amorphous materials, even with the strong decreasing of ΔTX observed after deformation by milling and during extrusion.

关键词： Metallic glass

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Thermal Shock of Al2O3-SiC Ceramic Material Obtained by Replication Method

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材料科学与工程（中英文版） 2010年第4期4卷 66-70页

作者： Wilson Acchar Wagner Lopes Torquato Antonio Carlos Costa Femando Barcelos Souza Eduardo Galvao Ramalho Pos-graduation Program of Science and Materials Engineering-UFRN NataI-RN CEP：59072-970 Brazil Pos-graduation Program of Mechanical Engineering-UFRN Natal-RN CEP： 59072-970 Brazil

Polymeric sponge replication technique is the most used process to obtain ceramic foams with a cellular structure for filtration applications. The most used route to produce a closed-cell structure for filter applications is the replication of polymer foam by application of ceramic slurry [1-3]. This method consists in the impregnation of polymeric foam with ceramic slurry followed by a heating treatment that will burn out the organic elements and sintering the material, resulting of a replication of the original foam. Morphology, size of the cell and the degree of interconnectedness, permeability and mechanical properties at room and high temperatures are important parameters that influence significantly the application of these materials. In this work X-ray diffraction, scanning electron microscopy and thermal shock have been investigated for a cellular ceramic material with 10, 15 and 20 ppi (pores per linear inch). The results obtained in this work indicated that the mechanical properties show a significant dependence on the cell size and thermal shock temperature.

关键词：陶瓷材料 Al2O3 热冲击复制法 SiC 高温力学性能材料应用陶瓷浆料

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Porcelain tiles produced by the dry route

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InterCeram: International Ceramic Review 2010年第1期59卷 13-17页

作者： Melchiades, F.G. Daros, M.T. Zanelatto, F.C. Boschi, A.O. Laboratório de Revestimentos Cerâmicos - LaRC Departamento de Engenharia de Materiais - DEMa Universidade Federal de São Carlos - UFSCar São Carlos Brazil Post Graduation Program in Materials Science and Engineering - PPGCEM UFSCar São Carlos Brazil

In Brazil, 70 % of the ceramic tile output is at present produced by the dry route. Increasing global environmental concerns and the recognition of the central role played by water have pointed towards encouraging dry processes. In this context, the objective of the present work was to study the feasibility of producing high quality porcelain tiles by the dry route. A brief comparison of the dry and wet routes for producing traditional ceramic tiles shows that there are two major differences: the particle sizes obtained by the wet route are usually considerably finer and the different minerals usually mix better with the wet route. The present work studied the relative importance of these differences and looked for raw materials and operational conditions that would result in better performance and glazed porcelain tiles of good quality.

关键词： Porcelain

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Mechanical characterization of cellular ceramics for high temperature applications

Mechanical characterization of cellular ceramics for high te...

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2nd International Congress on Ceramics, ICC 2008

作者： Acchar, W. Ramalho, E.G. Souza, F.B.M. Torquato, W.L. Department of Physics Federal University of Rio Grande Do Norte Natal-RN Brazil Pos-graduation Program of Mechanical Engineering Federal University of Rio Grande Do Norte Natal-RN Brazil Pos-graduation Program of Science and Materials Engineering Federal University of Rio Grande Do Norte Natal-RN Brazil

ISBN: (纸本)9788880800842

Ceramic porous structures are specially indicated for filters for molten metals, hot gases, thermal protection systems and heat exchangers, due their high permeability, good retention capacity, low density and high thermal insulation. This work describes the research carried out on mechanical properties of two different types of a commercial porous ceramic material (10 and 40 ppi). The ceramic material was characterized in terms of microstructural aspects, crystalline phases, density, porosity, strength and thermal shock behaviour. The results have indicated that the strength of the material remain practically constant, regardless of the temperature. The fracture analyses indicated that the fracture is normally caused by the presence of microcracks and also by the presence of a large amount of pores in the ceramic filaments.

关键词： Ceramic materials

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FLAMMABILITY AND TOXICITY OF COMPOSITE-materials FOR MARINE VEHICLES

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NAVAL ENGINEERS JOURNAL 1990年第5期102卷 45-54页

作者： SEVART, JL GRIFFIN, OH GURDAL, Z WARNER, GA Jeffrey L. Sevart:is a native of Kansas and a 1985 graduate of Kansas State University with a B.S. in mechanical engineering (magna cum laude). After working as a stress analysis engineer at Boeing Military Airplane Company in Wichita Kans. he attended Virginia Polytechnic Institute and State University and received an M.S. in engineering mechanics in February 1988. He currently resides in Akron Ohio working as a research engineer in tire composites research at The Goodyear Tire and Rubber Company. O. Hayden Griffin Jr.:received his B.S. and M.S. in mechanical engineering from Texas Tech University in 1970 and 1971 respectively. He received his Ph.D. in engineering mechanics from Virginia Polytechnic Institute and State University in 1980. Prior to joining the faculty of Virginia Polytechnic Institute and State University as associate professor of engineering science and mechanics in September 1985 he was employed at the U.S. Naval Surface Warfare Center (Dahlgren Virginia) BF Goodrich Tire Group (Akron Ohio) the Bendix Advanced Technology Center (Columbia Maryland) and the Johns Hopkins University Applied Physics Laboratory (Laurel Maryland). He is currently an associate director of the Virginia Institute for Material Systems. He is a registered professional engineer in Virginia and is a member of the American Society of Mechanical Engineers and the American Society for Composites. Zafer Gürdal:received his M.S. in mechanical and aerospace engineering from Illinois Institute of Technology in 1981 and his Ph.D. in aerospace engineering from Virginia Polytechnic Institute and State University in 1985. He worked as a research associate in the Aerospace and Ocean Engineering Department at Virginia Tech before joining the Engineering Science and Mechanics Department as an assistant professor in September 1985. Professor Gürdal's research interests include: composite structures failure mechanics of composites structural optimization and damage tolerant design. He is a member of the American Institute

Characteristics of both thermoplastic and thermoset composite materials as they pertain to marine vehicle applications are discussed. Comparison of various material selection factors such as strength, damage and moisture resistance, and flammability and toxicity as well as cost and availability of thermoset and thermoplastic composite materials are presented. Methods for testing and reducing the flammability and toxicity are discussed. Many commercially available composite systems are reported to provide favorable characteristics for marine applications. Although there seems to be a need for improved production technology for thermoplastics, they present potential advantages in physical properties over thermoset composites.

关键词： Composite materials

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MARINE APPLICATIONS OF PLASTICS

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Journal of the American Society for Naval Engineers 1960年第4期72卷 609-622页

作者： OWEN, T.B. ALFERS, J.B. USN Captain Owen was commissioned in the Navy in 1940 upon graduation from the University of Washington where he received a Bachelor of Science degree in Chemical Engineering. After four years of service afloat during World War II and a brief tour in the Bureau of Naval Personnel he participated in the Navy officers' postgraduate training program. In 1950 he received the degree of Doctor of Philosophy in Physical Chemistry at Cornell University. After a year's work at the University of Amsterdam he was designated as an Engineering Duty Officer. He then returned to the United States for duty in the Naval Sciences Division of the Office of Naval Research. He was then transferred to the Long Beach Naval Shipyard where he served successively as Assistant Repair Superintendent and Production Control Superintendent. At the conclusion of this tour he was assigned to the Bureau of Ships as Head of the Materials Development Branch. He is now Director Applied Science Division of the Bureau. Captain Owen holds the Silver Star Medal Bronze Star Medal the Navy Unit Commendation and other area service awards. He is a member of the American Chemical Society Tau Beta Pi and Sigma Xi. Mr. Alfers graduated from Kansas State University with a degree in Electrical Engineering. He worked for several years with the Rural Electrification Administration on operation and maintenance of Rural Electric distribution systems. For the past 18 years he has worked in research and development and standardization of plastic and dielectric materials for the Bureau of Ships. At the present time he is Acting Head of the Section for Polymers Fibers and Packaging of the Material Development Branch. Mr. Alfers recently received a Master's degree in Engineering Administration from George Washington University. He has received the Distinguished Civilian Service Award from the Secretary of the Navy and the Executive Award from the Reinforced Plastics Division of the Society of the Plastics Industry. He is a member of the Society of Plastic Enginee

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