Prediction of isoelectric point of manganese and cobalt lamellar oxides: application to controlled synthesis of mixed oxides.

Author(s) Tang, C.; Giaume, D.; Guerlou-Demourgues, L.; Lefèvre, G.; Barboux, P.
Journal Langmuir
Date Published 2018 May 17
Abstract

To design novel layered materials, bottom-up strategy is very promising. It consists in (1) synthesizing various layered oxides, (2) exfoliating them, then (3) restacking them in a controlled way. The latter step is based on electrostatic interactions between different layered oxides and is difficult to control. The aim of this study is to facilitate this step by predicting the isoelectric point (IEP) of exfoliated materials. Multisite Complexation model (MUSIC) was used in this objective and was shown to be able to predict IEP from the mean oxidation state of the metal in the (hydr)oxides, as the main parameter. Moreover, the effect of exfoliation on IEP has also been calculated: starting from platelets with a high basal/area percentage: exfoliation process has no impact on calculated IEP value, as verified on experimental values. Moreover, the restacked materials containing different monometallic (hydr)oxide layers also have an IEP consistent with values calculated with the model. This study proves that MUSIC model is a useful tool to predict IEP of various complex metal oxides and hydroxides.

DOI 10.1021/acs.langmuir.8b00190
ISSN 1520-5827
Citation Tang C, Giaume D, Guerlou-Demourgues L, Lefèvre G, Barboux P. Prediction of isoelectric point of manganese and cobalt lamellar oxides: application to controlled synthesis of mixed oxides. Langmuir. 2018.

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