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Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...
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Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...
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The rate of a reaction is affected by the concentrations of reactants. Rate laws (differential rate laws) or rate equations are mathematical expressions describing the relationship between the rate of a chemical reaction and the concentration of its reactants.
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Relation between oxidation kinetics and reactant transport in an aqueous foam.

Pierre Trinh1, Alesya Mikhailovskaya1, Grégory Lefèvre2

  • 1Soft Matter Science and Engineering, CNRS, ESPCI, PSL University, Sorbonne University, 10 rue Vauquelin, 75005 Paris, France.

Journal of Colloid and Interface Science
|April 17, 2023
PubMed
Summary

Aqueous foams offer a unique medium for metal oxidation. Optimizing foam liquid fraction and flow rate maximizes dissolved copper, balancing reactant transport for efficient chemical reactions.

Keywords:
AdvectionAqueous foamsDiffusionLeachingOxidation kinetics

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Physical Chemistry

Background:

  • Aqueous foams are promising reactive media for metal oxidation due to distinct reactant pathways.
  • Hydrogen ions (H+) can be supplied via the liquid phase, and oxygen (O2) via gas bubbles.

Purpose of the Study:

  • To investigate the oxidation of metallic copper within an aqueous foam.
  • To understand the relationship between reactant transport and chemical reaction kinetics.

Main Methods:

  • A metallic copper cylinder was immersed in an aqueous foam.
  • A forced drainage setup controlled advection velocity of H+ and foam liquid fraction.

Main Results:

  • Dissolved copper mass exhibited a maximum with increasing drainage flow rate and liquid fraction.
  • Analytical modeling revealed non-monotonic behavior due to competing H+ advection and O2 diffusion dynamics.
  • O2 diffusion slowed with decreased liquid film area at higher flow rates.

Conclusions:

  • Foam structure and drainage flow can be optimized for reactive foams with dual-phase reactants.
  • This study provides a framework for enhancing metal oxidation processes in reactive foams.