pH mediated delamination of anionic clay-like nickel–zinc hydroxysalt in water through intercalation of zwitterionic p-aminobenzoate ions

p-aminobenzoate could be intercalated into the anionic clay, Ni 3Zn 2(OH) 8(OAc) 2⋅2H 2O at a high pH (∼10). When the pH was reduced to ∼7 while washing colloidal dispersion due to delamination was observed. The development of partial positive charge on the amine end of the intercalated anion causes...

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Bibliographic Details
Published in:Solid state sciences 2006-02, Vol.8 (2), p.162-167
Main Authors: Britto, Sylvia, Rajamathi, Jacqueline T., Ravishankar, N., Shivakumara, C., Rajamathi, Michael
Format: Article
Language:English
Subjects:
Anionic clay
Chemistry
Colloidal state and disperse state
Colloids
Delamination
Exact sciences and technology
General and physical chemistry
Hydroxysalt
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Restacking
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Summary:p-aminobenzoate could be intercalated into the anionic clay, Ni 3Zn 2(OH) 8(OAc) 2⋅2H 2O at a high pH (∼10). When the pH was reduced to ∼7 while washing colloidal dispersion due to delamination was observed. The development of partial positive charge on the amine end of the intercalated anion causes repulsion between the layers leading to delamination and colloidal dispersion of monolayers in water. The layers could be restacked from the colloid to form the parent solid either by increasing the pH or by evaporation.
ISSN:1293-2558
1873-3085
DOI:10.1016/j.solidstatesciences.2005.11.007