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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...

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Related Experiment Video

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Co-localizing Kelvin Probe Force Microscopy with Other Microscopies and Spectroscopies: Selected Applications in Corrosion Characterization of Alloys

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Ostwald ripening of binary alloy particles.

V M Burlakov¹, L Kantorovich

¹Department of Materials, Oxford University, Parks Road, Oxford OX1 3PH, United Kingdom.

The Journal of Chemical Physics

|January 19, 2011

Summary

This study generalizes Ostwald ripening theory for binary alloy particles, revealing self-similar size and composition distributions. The findings offer new pathways for controlling particle size distributions in materials science.

Area of Science:

Materials Science
Physical Chemistry
Condensed Matter Physics

Background:

Classical Lifshitz-Slyozov-Wagner (LSW) theory describes Ostwald ripening in single-component systems.
Ostwald ripening is crucial for microstructure evolution in alloys and ceramics.
Extending LSW theory to multicomponent systems is essential for understanding alloy particle formation.

Purpose of the Study:

Generalize classical Lifshitz-Slyozov-Wagner theory for Ostwald ripening of binary alloy particles.
Investigate the steady-state and transient behaviors of particle size and composition distributions.
Explore the potential for controlling metastable particle size distributions.

Main Methods:

Theoretical generalization of Lifshitz-Slyozov-Wagner theory.

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Analysis of self-similar particle size and composition distributions.

Modeling of diffusion-controlled (LSW) and reaction-controlled (Wagner) ripening regimes.

Main Results:

Steady-state ripening exhibits self-similar particle size and composition distributions.
Particle size distribution shape depends on diffusion or reaction control, consistent with single-component theory.
Steady-state composition distribution shows universal size dependence across both regimes.
Compositional transients can precede size distribution equilibration, enabling metastable states.

Conclusions:

The generalized LSW theory accurately describes Ostwald ripening in binary alloys.
A universal composition-size relationship emerges during steady-state ripening.
Exploiting rapid compositional transients offers a novel route to engineer metastable particle size distributions.