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CGIAR Science Forum 2011: The Agriculture——Environment Nexus

作者： gonzalo zorrilla de san martin The Latin American Fund for Irrigated Rice（FLAR）

＜正＞Rice is one of the key food crops in Latin America and the Caribbean（LAC） and it is produced in many different agroecological environments and production *** general terms there is half of the rice area under rainfed or upland conditions and another half is irrigated,although the latter accounts for more than 75%of the 26 million tons of paddy rice produced a *** the last twenty years,there have been impressive advancements in rice yields,production efficiency,

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Room temperature synthesis of two-dimensional multi layer magnets based on α-Co^(Ⅱ) layered hydroxides

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Nano Materials Science 2022年第1期4卷 36-43页

作者： Victor Oestreicher Christian Dolle Diego Hunt Michael Fickert gonzalo Abellan Instituto de Ciencia Molecular(ICMol).Universidad de Valencia Catedritico Jose Beltran 2PaternaValencia46980Spain departamento de Física de la Materia Condensada GIy A.Instituto de Nanociencia y NanotecnologíaCNEA-CAC-CONICET.Av.Gral.PazSan MartinBuenas Aires1650Argentina Chair of Organic ChemistryⅡand Joint Institute of Advanced Materials and Processes(ZMP).Friedrich-Alexander-Universitát Erlangen-Nürnberg(FAU) Nikolaus-Fiebiger Strasse 1091058 Erlangen and Dr.-Mack Strasse 81Furth 90762Germany

Research on two-dimensional(2D) materials is one of the most active fields in materials science and nanotechnology. Among the members of the 2D family, layered hydroxides(LHs) represent an exceptional case of study due to their unparalleled chemical versatility which allows the modulation of their physicochemical properties at will. Nowadays, LHs based on earth-abundant metals are key materials in the areas of energy storage and conversion, hybrid materials or magnetism. α-Co hydroxides(Simonkolleite-like structures) are promising phases with tuneable electronic and magnetic properties by ligand modification. However, even in the simple case of α-Co^(Ⅱ) hydroxychlorides, the preparation of well-defined large 2D crystals is not straightforward, hindering the development of fundamental studies. Herein, we present the synthesis of 2D hexagonal crystals with outstanding sizethickness relationship(diameter > 5 μm and thickness of 20 ± 7 nm) by a simple homogeneous synthesis taking place at room temperature. In structural terms, no differences are observed between our layered materials and those obtained hydrothermally. However, dynamic susceptibility measurements alert about different arrangements of the magnetic sublattices, which have been rationalized with structural DFT calculations. This work provides an extremely easy bottom-up method to obtain high-quality 2D crystals based on α-CoIIhydroxides,paving the way for the development of fundamental studies and applications.

关键词： Two-dimensional(2D)materials Layered hydroxides Hexagonal morphology Bottom-up synthesis Magnetism

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