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Synthesis and characterisation of copper(II) hydroxide gels

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Abstract

The formation of copper(II) hydroxide gels from aqueous precursors requires very critical conditions. Gels have been obtained by adding ammonia to aqueous solutions of copper(II) acetate, in the presence of a small amount of sulphate ions. Other salts (chloride, nitrate, sulphate) or bases (NaOH, KOH) lead to precipitation rather than gelation. These gels are actually made of an intimate mixture of acetate-based organic/inorganic polymers and nanometric posjnakite crystals Cu4(OH)6(SO4) · H2O. Acetate ions and ammonia can be partially removed upon washing, which after drying leads to crystalline copper(II) hydroxide needles deposited on a strongly oriented layer of posjnakite crystals. A theoretical model based on the electronegativity equalisation principle is used to describe these experimental results. It provides a better understanding of the role of complexing anions during the formation of condensed phases.

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Authors and Affiliations

  1. Laboratoire de Chimie de la Matière Condensée, Université Pierre et Marie Curie 4, Place Jussieu, 75252, Paris Cedex 05, France

    Marc Henry, Christian Bonhomme & Jacques Livage

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  1. Marc Henry
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  2. Christian Bonhomme
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  3. Jacques Livage
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Henry, M., Bonhomme, C. & Livage, J. Synthesis and characterisation of copper(II) hydroxide gels. J Sol-Gel Sci Technol 6, 155–167 (1996). https://doi.org/10.1007/BF00425973

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