Dissolution of magnesium oxide in aqueous acid: an atomic force microscopy study

Article Abstract:

The hydrodynamic atomic force microscopy (AFM) cell is used to investigate the dissolution of the surfaces (100), (110) and (111) of MgO in aqueous hydrochloric acid. This allowed the modeling of the rate of proton transport to the solid surface. When compared with directly measured rates of dissolution, the dissolution of all three surfaces was found to be a surface-controlled reaction. The (100) plane was found to dissolve via the growth of etch pits which are either circular or square according to the acid concentration, whereas the (110) surface dissolves to form a corrugated surface of parallel with surfaces consisting of (100) planes. The (111) surface dissolves via triangular etch pits of a fixed orientation.

Usage, Atomic force microscopy

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Energy loss structure of X-ray photoelectron spectra of MgO and alpha-Al2O3

Article Abstract:

First-principles computation of dielectric functions was used to derive the theoretical photoelectron energy loss functions of MgO and alpha-Al2O3. The theoretical values were then compared with experimental values. Results showed that the experimental peaks for MgO and alpha-Al2O3 at 23.2 eV and 25.2 ev, respectively, are due to bulk plasmon loss. The peaks at 11.3, 15.3 and 18.3 eV for MgO and those at 14.5 and 35.3 eV for alpha-Al2O3 are due to interband transitions from the valence band to the conduction band.

Aluminum oxide, Molecular spectra

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Mechanism of solid/liquid interfacial reactions. Atomic force microscopy studies of the self-passivating reaction between solid p-chloranil and aqueous phase N,N-dimethylphenylenediamine

Article Abstract:

In situ atomic force microscopy was used to examine the self-passivating reaction between solid p-chloranil and alkaline aqueous phase of dimethylphenylenediamine. Results showed a progressive nucleation of the overgrowth that covers the time (t) dependence S(t) = 1 - exp(-k(sub 3)t(super 3)), where K(sub 3) is a rate constant. The z peizo voltage measurements made throughout the reaction revealed a hydroxide-driven dissolution before the formation of the overgrowth and the surface became fully passivated.

Crystals, Methamphetamine, Chemical reactions

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