http://www.cnr.it/ontology/cnr/individuo/prodotto/ID22127

Morphological Control of Hydrothermal Ni(OH)2 in the Presence of Polymers and Surfactants: Nanocrystals, Mesocrystals, and Superstructures (Articolo in rivista)

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Morphological Control of Hydrothermal Ni(OH)2 in the Presence of Polymers and Surfactants: Nanocrystals, Mesocrystals, and Superstructures (Articolo in rivista) (literal)

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Maria Teresa Buscaglia; Vincenzo Buscaglia; Carlo Bottino; Massimo Viviani; Roxane Fournier; Mohamed Sennour; Sabrina Presto; Rinaldo Marazza; Paolo Nanni (2008)
Morphological Control of Hydrothermal Ni(OH)2 in the Presence of Polymers and Surfactants: Nanocrystals, Mesocrystals, and Superstructures
in Crystal growth & design (Online); American Chemical Society, Washington (Stati Uniti d'America)
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Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Maria Teresa Buscaglia; Vincenzo Buscaglia; Carlo Bottino; Massimo Viviani; Roxane Fournier; Mohamed Sennour; Sabrina Presto; Rinaldo Marazza; Paolo Nanni (literal)

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Institute for Energetics and Interphases, National Research Council, Via De Marini 6, I-16149 Genoa, Italy; Italian Interuniversity Consortium on Materials Science and Technology INSTM, Via G. Giusti 9, I-50121 Florence, Italy; ESIREM, Université de Bourgogne, Avenue A. Savary 9, 21078 Dijon Cedex, France; Centre des Matériaux , Ecole des Mines de Paris, BP 87, 91000 Evry, France; Department of Chemistry and Industrial Chemistry, University of Genoa, Via Dodecaneso 31, I-16146 Genoa, Italy; Department of Process and Chemical Engineering, University of Genoa, Fiera del Mare, P.le Kennedy, I-16149 Genoa, Italy (literal)

Titolo

Morphological Control of Hydrothermal Ni(OH)2 in the Presence of Polymers and Surfactants: Nanocrystals, Mesocrystals, and Superstructures (literal)

Abstract

Polymers with different hydrophilic groups [polyvinylpyrrolidone (PVP), ammonium polyacrylate (APA), and hydroxypropylmethyl cellulose (HPMC)] and surfactants [cetyltrimethylammonium bromide (CTAB) and sodium dodecylbenzensulfonate (SDBS)] were used as additives to modify the crystallization of beta-Ni(OH)2 in hydrothermal conditions. Marked morphological changes in the beta-Ni(OH)2 particles were observed depending on the additive concentration and on the duration of the hydrothermal treatment. The final morphology is the result of a complex, time-dependent self-assembly and growth process. Well-defined particles with sizes from submicrometer range to a few micrometers corresponding to hexagonal lamellae, hexagonal tabular mesocrystals, rosette- and flowerlike aggregates of lamellae, hexagonal prismatic mesocrystals, and acicular nanocrystals were easily obtained after a short time (2-24 h) aging at 150-200 °C. With PVP and CTAB, there is evidence of a growth process dominated by self-assembly of nanocrystals to produce mesocrystals. The formation of spherical superstructures (with SDBS, up to 70 ¼m in diameter) and hollow spheres (with PVP) is observed at long times (>24 h) as a result of solvent-mediated recrystallization processes, like Ostwald ripening. The overall results show that hydrothermal synthesis of beta-Ni(OH)2 in the presence of polymers with hydrophilic groups and surfactants is a versatile tool for crystal morphogenesis. (literal)

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