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Pre-formulation Study for Preparation of Mucoadhesive Buccal Tablets Containing Nystatin and Cashew Gum by Direct Compression

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Journal of Physical Science and Application 2019年第1期9卷 1-14页

作者： Ana Paula de SáPinto Abrahao Magalhaes Flávia Almada do Carmo Claudia Regina Elias Mansur Institute of Macromolecules Federal University of Rio de JaneiroRio de Janeiro 21941-598Brazil Faculty of Pharmacy Federal University of Rio de JaneiroRio de Janeiro 21941-599Brazil Program of Materials Engineering and Metallurgy Technology CenterAlberto Luiz Institute of CoimbraPost-Graduation and Engineering Research-COPPEFederal University of Rio de JaneiroRio de Janeiro 21941-594Brazil

Cashew gum is a branched chain heteropolysaccharide extracted from the cashew tree (Anacardium occidentale L.).Purified cashew gum (PCG) is free of plant contaminants and is highly *** studies have indicated this polymer can be relevant in the pharmaceutical industry for production of ***,our research group reported that PCG can be used as a diluent for tablets produced by direct *** (Nys) is the drug of first choice for treatment of oral candidiasis,in the form of a *** treatment consists of up to six daily doses of a suspension of nys at 500,000 IU,causing low therapeutic adhesion by *** objective of this study was to investigate the behavior of PCG together with nys and other excipients (flavoring agents and lubricating agent) for future manufacture of mucoadhesive buccal tablets by direct *** that purpose,we performed pre-formulation tests (FTIR,TGA,XRD,solubility,pH,granulometry,swelling degree and powder flow) with physical mixtures of the drug and *** results were excellent,demonstrating that PCG is a polymer with potential for this type of application.

关键词： Purified cashew gum nystatin mucoadhesive buccal tablets

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Sequential deposition method of TiO2/CH3NH3PbI3 films for solar cell application

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IOP Conference Series: materials Science and engineering 2019年第1期659卷

作者： A E R T P Oliveira F Bonatto A K Alves C Fragassa Post-Graduation Program in Mining Metallurgy and Materials Engineering (PPGE3M) Federal University of Rio Grande do Sul Osvaldo Aranha 99 90035-190 Porto Alegre Brazil InterDepartmental Centre for Industrial Research on Advanced Applications in Mechanical Engineering & Materials Technology Alma Mater Studiorum University of Bologna viale Risorgimento 2 40136 Bologna Italy

Seeking to study innovative solar cell compositions with the goal to reach the highest energy efficiency level attainable, the aim of this study was to develop a route to obtain a solar cell composed by hybrid perovskite (CH3NH3PbI3) using a sequential deposition method through the techniques of spin-coating and immersion. Initially, the deposition of PbI2 thin film of was performed on a FTO/glass substrate coated with TiO2, which was subsequently converted into perovskite crystals through spin coating using a CH3NH3I solution. The influence of the PbI2 layer thickness on the formation of CH3NH3PbI3 crystals was evaluated. The hydrophilic characteristic of TiO2 affects the distribution of the crystals nucleation sites, since PbI2 possesses a non-polar liquid characteristic. The characterization of the perovskite thin films showed that thickness affects directly the bandgap and the surface morphology, revealing the presence of dendritic structures and acicular crystals. Both growth and coverage increased for thinner layers of PbI2. It was also possible to observe an increased uniformity in the film for smaller PbI2 layers.

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Preparation of Modified Titanate Nanotubes and Its Application in Polyurethane Nanocomposites

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Macromolecular Symposia 2016年第1期368卷 93-97页

作者： Monteiro, Wesley F. dos Santos, Claudia A. B. Einloft, Sandra Oberson, Michèle Carone, Carlos L. P. Ligabue, Rosane A. Graduation Program in Materials Engineering and Technology PUCRS Porto Alegre Brazil School of Chemistry PUCRS Porto Alegre Brazil Institute of Chemistry UFRGS Porto Alegre Brazil Institute of Exact and Technological Science FEEVALE Novo Hamburgo Brazil

This work presents the preparation of modified titanates nanotubes with tetraethyl orthosilicate (TNT-TEOS) and their use in the synthesis of TNT-TEOS/polyurethane nanocomposite by in situ polymerization. The filler was added in a proportion of 1% (w/w) relative to the polyol weight. The TNT-TEOS presented a specific surface area of 127 m2/g lower than that obtained for TNT (177 m2/g). The addition of TNT-TEOS in a polyurethane matrix promoted an increase in thermal stability of the polymer when compared to the pure PU and in crystallinity as observed by increase in melting and crystallization enthalpies. This effect can be attributed to good filler dispersion into polymer matrix and the interaction between the filler and the soft segments of the polyurethane. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

关键词： Nanocomposites

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Effect of time on the carbonation reaction of saline aquifers with controlled pH

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Energy Procedia 2011年 4卷 4546-4551页

作者： Marta Kerber Schütz Natália Lopes Angélica Cenci Rosane Ligabue Jeane Dullius Sandra Einloft João Marcelo Ketzer Brazilian Carbon Storage Research Center Pos-Graduation Program in Materials Engineering and Technology Faculty of Chemistry Pontifical Catholic University of Rio Grande do Sul Av. Ipiranga 6681 90619-900 Porto Alegre Rio Grande do Sul Brazil

This work investigated the effect of time on the carbonation reaction in synthetic saline solution, under mild conditions and with a controlled pH, aiming the mineral trapping of CO 2 on saline aquifers. The experiments were performed in a glass reactor at 40 °C, 6 hours and atmospheric pressure. The saline solution and solid phase were characterized by Flame Atomic Absorption Spectroscopy (FAAS), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). This work demonstrated that the saline solution pH lowers to approximately 7-8 in the first hour of reaction (initial pH of approximately 10), remaining constant until the end of the reaction. Through the analysis by AAS, it was found that the concentration of Ca ions in the brine decreases with time. A greatest reduction in the Ca ions concentration occurs within the first two hours of reaction, remaining constant in the others hours. The Mg concentration showed the trend of the final concentration remains close to initial concentration, even with the carbonates precipitation. SEM analysis indicated that the precipitates obtained had morphology similar to that found for various forms of calcium carbonate (i.e calcite and aragonite). FTIR analysis shows characteristic bands of carbonates, which agrees with the results of the analysis by SEM.

关键词： CO 2 Carbonation Time PH Buffer

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Polyaniline/Graphite Nanocomposites: Synthesis and Characterization

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Macromolecular Symposia 2011年第1期299-300卷

作者： Grasiela Gheno Nara Regina de Souza Basso Roberto Hübler Pos-graduation Program of Materials Engineering and Technology Pontifical Catholic University of Rio Grande do Sul Rio Grande do Sul Brazil

Graphite nanosheet (GNS) was prepared by physical/chemical method. The polyaniline (PANI)/graphite nanocomposites were synthesized by in situ polymerization of aniline monomer using different amounts (1 to 5 wt%) of graphite nanosheets. The formation of graphite nanosheets was confirmed by Transmission Electron Microscope (TEM) and X-ray Diffraction (XRD). The surface morphology of exfoliated graphite and PANI/GNS nanocomposites were studied by the Scanning Electronic Microscopy (SEM). A device for electrical conductivity measurements was developed in this work and the results show that the conductivity of PANI/GNS is dependent of the GNS contents.

关键词： conducting polymers nanocompósitos polyaniline TEM XRD

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CO 2 storage with indirect carbonation using industrial waste

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Energy Procedia 2011年 4卷 1010-1017页

作者： Cleiton Kunzler Natacha Alves Evandro Pereira Jonatã Nienczewski Rosane Ligabue Sandra Einloft Jeane Dullius Brazilian Carbon Storage Research Center Pontifical Catholic University of Rio Grande do Sul Av. Ipiranga 6681 90619-900 Porto Alegre Rio Grande do Sul Brazil Faculty of Chemistry Pontifical Catholic University of Rio Grande do Sul Av. Ipiranga 6681 90619-900 Porto Alegre Rio Grande do Sul Brazil Pos-Graduation Program in Materials Engineering and Technology Pontifical Catholic University of Rio Grande do Sul Av. Ipiranga 6681 90619-900 Porto Alegre Rio Grande do Sul Brazil

In this work we studied the Indirect Carbonation of concrete waste and steel slag in order to find the best conditions of each of then aims the CO 2 storage and find a useful destination of the waste. A complete study was developed with steel slag and the best results were adopted to concrete waste owing the expansion of construction industry in Brazil. The lixiviation with HCl acid, time, rate Liquid/Solid, temperature and concentration of acid was deep studied with a goal to use milder conditions avoiding energy penalty in the industrial process. Therefore a Calcium Carbonate was obtained and the feedstock could be re-used in the industries. The experiments were performed in a glass reactor at atmospheric pressure. The solutions and solid phases were characterized by Flame Atomic Absorption Spectroscopy (FAAS), Scanning Electron Microscopy (SEM) and Inductively Coupled Plasma - Optical Emission Spectrometry (ICP-OES).

关键词： CO 2 Indirect carbonation Lixiviation Waste Alkaline metals

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Synthesis of Poly(propylene)/Graphite Nanocomposites by in Situ Polymerization

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Macromolecular Symposia 2011年第1期299-300卷

作者： Larissa Stieven Montagna Fabiana de Carvalho Fim Griselda Barrera Galland Nara Regina de Souza Basso Pos-Graduation Program in Materials Engineering and Technology Pontifical Catholic University of Rio Grande do Sul Av. Ipiranga 6681 Porto Alegre 90619-900 – Brazil Chemical Institute University Federal of Rio Grande do Sul RS Brazil Av. Bento Gonçalves 9500 Porto Alegre 91570-970 – Brazil

This work presents the synthesis of polypropylene/graphite nanocomposites by in situ polymerization using the catalytic system C 20 H 16 Cl 2 Zr ( rac -ethylenebis (indenyl)zirconium(IV)) dichloride/Methyoluminoxane (MAO). 60 nm graphite nanosheets (GNS) were obtained by means of the chemical exfoliation, thermal and ultrasound treatment. GNS previously treated with MAO were added into the reactor at percentages of 0.3, 1.0 and 2.2% (w/w) in relation to nanocomposite yields. The morphology of graphite nanosheets and nanocomposites was studied by Scanning Electron Microscopy (SEM). Moreover, the structural properties of natural graphite flake (NGF), graphite nanosheets (GNS) and nanocomposites were observed through the X-Ray diffraction (XRD) analysis and by Transmission Electron Microscopy (TEM).

关键词： graphite nanosheets in situ polymerization nanocomposites poly(propylene)

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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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CIVILIAN CAREERS FOR NAVAL ENGINEERS

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Journal of the American Society for Naval Engineers 1951年第2期63卷 332-342页

作者： BIRD, ALBERT F. The author a Panel Coordinator in the Equipment and Materials Committee of the Research and Development Board recently completed fifteen years of service in the Bureau of Ships. Mr. Bird joined the Bureau in the Specifications Section from which he moved to the Turbine and Gear desk. Save for the World War II period which Mr. Bird spent in the Landing Craft Program for the Bureau of Ships his career has been devoted to the Navy's Turbines and Gears. Naval Engineering in the Bureau of Ships appealed to Mr. Bird shortly after his graduation from Massachusetts Institute of Technology in 1930 and has proven to be a satisfactory career for the reasons presented in his paper.

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TITANIUM FOR MARINE APPLICATIONS

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NAVAL ENGINEERS JOURNAL 1971年第5期83卷 37-&页

作者： LITVIN, DA SMITH, DE David A. Litvin a native of Baltimore graduated in 1969 from Drexel Institute of Technology with a Degree in Metallurgical Engineering. While attending Drexel he worked as a co-op student at NSRDL in Annapolis Md. where he developed a special interest in stress-corrosion cracking of titanium alloys. Upon graduation he joined the Naval Ship Engineering Center as a Materials Engineer. He is a member of the Association of Senior Engineers the American Society for Metals the American Institute of Mining Metallurgical and Petroleum Engineers and the Alpha Sigma Mu Metallurgy Honorary Fraternity. David E. Smith was born in Brooklyn and attended Rensselaer Polytechnic Institute where he graduated in 1959 with a Degree in Metallurgical Engineering. After spending three years as a communications officer for the Air Force he joined the Dow Chemical Company as a Welding Engineer. After two and a half years he then worked for Ling-Tempco-Vought prior to joining the Naval Ship Engineering Center as a Materials Engineer in 1967. One of his most important projects has been the Structural Titanium Alloy Development Program which he has monitored over the lost three years. He is a member of the American Society for Metals the American Welding Society and the Association of Senior Engineers.

Titanium, “the wonder metal of the future” is rapidly becoming the metal of the seventies. The high strength to weight ratio, the excellent corrosion resistance in many aggressive environments, and good elevated temperature properties have resulted in the widespread use of titanium and its alloys, particularly in the aerospace and chemical industries. Titanium has demonstrated its superiority in sea water environments, yet the marine industry has been slow to utilize titanium's benefits. The intent of this paper is twofold—First to inform the marine industry on many advantages of titanium alloys for sea water use by describing properties and successful applications. Second, to show how susceptibility to stress corrosion cracking of certain titanium alloys, which became evident several years ago, is now understood and controllable. Well documented research has substituted knowledge for doubt and fear. Titanium and several titanium alloys are considered ready for use as engineering materials in the marine industry. Today, they are competitive with nickel base alloys in cost. Naval architects and design engineers may now use titanium in certain applications to provide superior performance over traditional marine materials.

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