Reversible hydration and aqueous exfoliation of the acetate-intercalated layered double hydroxide of Ni and Al: Observation of an ordered interstratified phase

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• 作者：G.V. Manohara ; P. Vishnu Kamath ; Wolfgang Milius
• 关键词：Layered double hydroxides ; Hydration&ndash ; dehydration ; Interstratification ; Aqueous exfoliation
• 刊名：Journal of Solid State Chemistry
• 出版年：2012
• 出版时间：December, 2012
• 年：2012
• 卷：196
• 期：Complete
• 页码：356-361
• 全文大小：729 K

文摘

Acetate-intercalated layered double hydroxides (LDHs) of Ni and Al undergo reversible hydration in the solid state in response to the ambient humidity. The LDH with a high layer charge (0.33/formula unit) undergoes facile hydration in a single step, whereas the LDH with a lower layer charge (0.24/formula unit) exhibits an ordered interstratified intermediate, comprising the hydrated and dehydrated layers stacked alternatively. This phase, also known as the staged S-2 phase, coexists with the end members suggesting the existence of a solution-type equilibrium between the S-2 phase and the end members of the hydration cycle. These LDHs also undergo facile aqueous exfoliation into 2-5 nm-thick tactoids with a radial dimension of 0.2-0.5 ¦Ìm.