The Experts below are selected from a list of 861 Experts worldwide ranked by ideXlab platform
T Hungria - One of the best experts on this subject based on the ideXlab platform.
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nanostructured ceramics of 0 92pbzn 1 3 nb 2 3 o 3 0 08pbtio 3 processed by sps of nanocrystalline powders obtained by Mechanosynthesis
Nanotechnology, 2008Co-Authors: T Hungria, Harvey Amorin, Jean Galy, J Ricote, Miguel Alguero, A CastroAbstract:This work reports the successful use of a combination of non-conventional methods of synthesis (Mechanosynthesis) and sintering (spark plasma sintering, SPS) for the preparation of nanostructured 0.92PbZn1/3Nb2/3O3?0.08PbTiO3 (PZN?PT) ceramics. With this approach we achieve not only the stabilization of the PZN?PT perovskite phase in ceramics when sintering is carried out at temperatures between 823 and 873?K, but also good control of the grain growth, necessary to produce nanostructured materials with grain sizes of 15?20?nm. This reduction of the size results in relaxor-type electric behaviour.
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nanostructured ceramics of 0 92pbzn 1 3 nb 2 3 o 3 0 08pbtio 3 processed by sps of nanocrystalline powders obtained by Mechanosynthesis
Nanotechnology, 2008Co-Authors: T Hungria, Harvey Amorin, Jean Galy, J Ricote, Miguel Alguero, A CastroAbstract:This work reports the successful use of a combination of non-conventional methods of synthesis (Mechanosynthesis) and sintering (spark plasma sintering, SPS) for the preparation of nanostructured 0.92PbZn1/3Nb2/3O3–0.08PbTiO3 (PZN–PT) ceramics. With this approach we achieve not only the stabilization of the PZN–PT perovskite phase in ceramics when sintering is carried out at temperatures between 823 and 873 K, but also good control of the grain growth, necessary to produce nanostructured materials with grain sizes of 15–20 nm. This reduction of the size results in relaxor-type electric behaviour. (Some figures in this article are in colour only in the electronic version)
A Castro - One of the best experts on this subject based on the ideXlab platform.
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nanostructured ceramics of 0 92pbzn 1 3 nb 2 3 o 3 0 08pbtio 3 processed by sps of nanocrystalline powders obtained by Mechanosynthesis
Nanotechnology, 2008Co-Authors: T Hungria, Harvey Amorin, Jean Galy, J Ricote, Miguel Alguero, A CastroAbstract:This work reports the successful use of a combination of non-conventional methods of synthesis (Mechanosynthesis) and sintering (spark plasma sintering, SPS) for the preparation of nanostructured 0.92PbZn1/3Nb2/3O3?0.08PbTiO3 (PZN?PT) ceramics. With this approach we achieve not only the stabilization of the PZN?PT perovskite phase in ceramics when sintering is carried out at temperatures between 823 and 873?K, but also good control of the grain growth, necessary to produce nanostructured materials with grain sizes of 15?20?nm. This reduction of the size results in relaxor-type electric behaviour.
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nanostructured ceramics of 0 92pbzn 1 3 nb 2 3 o 3 0 08pbtio 3 processed by sps of nanocrystalline powders obtained by Mechanosynthesis
Nanotechnology, 2008Co-Authors: T Hungria, Harvey Amorin, Jean Galy, J Ricote, Miguel Alguero, A CastroAbstract:This work reports the successful use of a combination of non-conventional methods of synthesis (Mechanosynthesis) and sintering (spark plasma sintering, SPS) for the preparation of nanostructured 0.92PbZn1/3Nb2/3O3–0.08PbTiO3 (PZN–PT) ceramics. With this approach we achieve not only the stabilization of the PZN–PT perovskite phase in ceramics when sintering is carried out at temperatures between 823 and 873 K, but also good control of the grain growth, necessary to produce nanostructured materials with grain sizes of 15–20 nm. This reduction of the size results in relaxor-type electric behaviour. (Some figures in this article are in colour only in the electronic version)
Tomislav Friscic - One of the best experts on this subject based on the ideXlab platform.
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Mechanosynthesis of pharmaceutically relevant sulfonyl thio ureas
ChemInform, 2014Co-Authors: Davin Tan, Vjekoslav Štrukil, Cristina Mottillo, Tomislav FriscicAbstract:The first application of mechanochemistry to conduct the synthesis of sulfonyl-(thio)ureas (III), (VI), and (X), including antidiabetic drugs tolbutamide, chlorpropamide (VIa) and glibenclamide (X) by either stoichiometric base-assisted or Cu-catalyzed coupling of sulfonamides and iso(thio)cyanates, is reported.
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Mechanosynthesis of pharmaceutically relevant sulfonyl thio ureas
Chemical Communications, 2014Co-Authors: Davin Tan, Vjekoslav Štrukil, Cristina Mottillo, Tomislav FriscicAbstract:We demonstrate the first application of mechanochemistry to conduct the synthesis of sulfonyl-(thio)ureas, including known anti-diabetic drugs tolbutamide, chlorpropamide and glibenclamide, in good to excellent isolated yields by either stoichiometric base-assisted or copper-catalysed coupling of sulfonamides and iso(thio)cyanates.
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clean and efficient synthesis using mechanochemistry coordination polymers metal organic frameworks and metallodrugs
Croatica Chemica Acta, 2012Co-Authors: Tomislav Friscic, Vjekoslav Štrukil, Mirjana Eckertmaksic, Ivan Halasz, Robert E DinnebierAbstract:This review briefly discusses recent advances and future prospects in the mechanochemical synthesis of coordination compounds by ball milling and grinding, and highlights our contributions to the Mechanosynthesis of porous metal-organic frameworks (MOFs) and zeolitic imidazolate frameworks (ZIFs), metal-organic pharmaceutical derivatives and metallodrugs using the recently developed mechanochemical methods of liquid-assisted grinding (LAG) and ion- and liquid-assisted grinding (ILAG). The role of mechanochemistry in the development of a solvent-free laboratory, cocrystal synthesis and new materials for luminescence and gas absorption is also highlighted.
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chapter 8 application of mechanochemistry in the synthesis and discovery of new pharmaceutical forms co crystals salts and coordination compounds
ChemInform, 2011Co-Authors: Tomislav Friscic, William JonesAbstract:In the past decade mechanochemical methodologies, such as neat grinding and liquid-assisted grinding, have been demonstrated to be a highly efficient means of both synthesising and screening for pharmaceutical co-crystals. This chapter provides an overview of these mechanochemical methodologies, their applications to date, an overview of mechanistic details and a brief comparison with more conventional co-crystallisation methods based on solution crystallisation and slurrying. In addition to the use of Mechanosynthesis in the context of pharmaceutical co-crystals, its application for pharmaceutical salt synthesis and screening is also described, as well as recent applications in the synthesis of metal–organic derivatives.
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towards an environmentally friendly laboratory dimensionality and reactivity in the Mechanosynthesis of metal organic compounds
Chemical Communications, 2010Co-Authors: Vjekoslav Štrukil, László Fábián, David G. Reid, Melinda J. Duer, Graham J. Jackson, Mirjana Eckertmaksic, Tomislav FriscicAbstract:We present a proof-of-principle study of an environmentally-friendly approach to laboratory research, in which the synthesis and structural characterisation of metal-organic complexes and frameworks are achieved without using bulk solvents; our study addresses the use of heteroditopic ligands for manipulating the dimensionality of metal-organic materials and describes how kinetic obstacles in such Mechanosynthesis can be overcome.
Guido Ennas - One of the best experts on this subject based on the ideXlab platform.
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Mechanosynthesis of coordination polymers based on dithiophosphato and dithiophosphonato NiII complexes and 1,4-di(3-pyridinyl)buta-1,3-diyne ligand
2017Co-Authors: Valentina Cabras, Carla M. Aragoni, Simon J. Coles, Romina Lai, Martina Pilloni, Enrico Podda, Alessandra Scano, Guido EnnasAbstract:In recent decades the Mechanosynthesis of Coordination Polymers (CPs) has consolidated as a powerful method for the formation of coordination bonds. The aim of this study regards the environmental friendly Mechanosynthesis of coordination polymers by milling the neutral square planar NiII complexes [((MeO)2PS2)2Ni] (1), [((EtO)2PS2)2Ni] (2), [((MeO–C6H4)(MeO))PS2)2Ni] (3), [((MeO–C6H4)(EtO))PS2)2Ni] (4), with the organic ligand 1,4-di(3-pyridyl)buta-1,3-diyne (L). Using these substrates, several Mechanosynthesis were performed via Net Grinding (NG) and Liquid Assisted Grinding (LAG) approaches. A mechanochemical trend concerning the general inverse correlation between melting point of reagents and reactivity has been observed, highlighting a possible mechanism for these reactions under mechanical conditions.
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Mechanosynthesis and process characterization of nanostructured manganese ferrite
Materials Chemistry and Physics, 2005Co-Authors: Franco Padella, Guido Ennas, Carlo Alvani, A. La Barbera, Raffaele Liberatore, Francesca VarsanoAbstract:Abstract Nanocrystalline MnFe 2 O 4 particles were synthesized by a high-energy ball milling technique, starting from a manganosite (MnO) and hematite (α-Fe 2 O 3 ) stoichiometric powder mixture. The Mechanosynthesis process was performed at room temperature both in hardened steel and in tungsten carbide vials. X-ray powder diffraction quantitative phase analysis by the Rietveld method was used to study the chemical transformations promoted by the milling action. The nanocrystalline MnFe 2 O 4 spinel phase begins to appear after 10 h of milling and reaches its maximum content (≈0.8 molar fraction) after 35 h of milling. A prolonged milling time induces a dramatic contamination of the powder mixture, when hardened stainless steel was adopted, due to metallic iron originating from vial and balls debris. Ball milling is able to induce a redox reaction between Fe III and metallic iron, transforming the MnFe 2 O 4 spinel phase into a wustite type (Fe, Mn)O phase. The yield of the hydrogen production reaction on synthetised materials is reported.
Harvey Amorin - One of the best experts on this subject based on the ideXlab platform.
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nanostructured ceramics of 0 92pbzn 1 3 nb 2 3 o 3 0 08pbtio 3 processed by sps of nanocrystalline powders obtained by Mechanosynthesis
Nanotechnology, 2008Co-Authors: T Hungria, Harvey Amorin, Jean Galy, J Ricote, Miguel Alguero, A CastroAbstract:This work reports the successful use of a combination of non-conventional methods of synthesis (Mechanosynthesis) and sintering (spark plasma sintering, SPS) for the preparation of nanostructured 0.92PbZn1/3Nb2/3O3?0.08PbTiO3 (PZN?PT) ceramics. With this approach we achieve not only the stabilization of the PZN?PT perovskite phase in ceramics when sintering is carried out at temperatures between 823 and 873?K, but also good control of the grain growth, necessary to produce nanostructured materials with grain sizes of 15?20?nm. This reduction of the size results in relaxor-type electric behaviour.
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nanostructured ceramics of 0 92pbzn 1 3 nb 2 3 o 3 0 08pbtio 3 processed by sps of nanocrystalline powders obtained by Mechanosynthesis
Nanotechnology, 2008Co-Authors: T Hungria, Harvey Amorin, Jean Galy, J Ricote, Miguel Alguero, A CastroAbstract:This work reports the successful use of a combination of non-conventional methods of synthesis (Mechanosynthesis) and sintering (spark plasma sintering, SPS) for the preparation of nanostructured 0.92PbZn1/3Nb2/3O3–0.08PbTiO3 (PZN–PT) ceramics. With this approach we achieve not only the stabilization of the PZN–PT perovskite phase in ceramics when sintering is carried out at temperatures between 823 and 873 K, but also good control of the grain growth, necessary to produce nanostructured materials with grain sizes of 15–20 nm. This reduction of the size results in relaxor-type electric behaviour. (Some figures in this article are in colour only in the electronic version)