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Homogeneous Equilibria for Gaseous Reactions
For gas-phase reactions, the equilibrium constant may be expressed in terms of either the molar concentrations (Kc) or partial pressures (Kp) of the reactants and products. A relation between these two K values may be simply derived from the ideal gas equation and the definition of molarity. According to the ideal gas equation:
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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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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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The formation of a solution is an example of a spontaneous process, which is a process that occurs under specified conditions without energy from some external source.
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Heterogeneous nucleation in solutions: generalized Gibbs' approach.

Alexander S Abyzov1, Jürn W P Schmelzer2

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Heterogeneous nucleation in solutions is influenced by surface wettability. Highly wettable surfaces significantly enhance nucleation, shifting instability limits compared to homogeneous nucleation.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Thermodynamics

Background:

  • Heterogeneous nucleation is crucial in phase transitions.
  • Understanding nucleation on solid surfaces requires accounting for cluster properties.
  • The generalized Gibbs approach offers a framework for modeling these phenomena.

Purpose of the Study:

  • To model heterogeneous nucleation on planar solid surfaces.
  • To investigate the impact of supersaturation on critical cluster parameters.
  • To analyze the role of surface wettability in nucleation processes.

Main Methods:

  • Utilizing the generalized Gibbs approach for nucleation modeling.
  • Employing a regular solution model for analysis.
  • Examining the dependence of nucleation parameters on supersaturation.

Main Results:

  • Contact angle and catalytic activity are supersaturation-dependent.
  • Low wettability surfaces have minor nucleation influence.
  • High wettability surfaces significantly enhance nucleation and shift spinodal limits.

Conclusions:

  • Surface wettability critically affects heterogeneous nucleation rates.
  • The generalized Gibbs approach accurately captures nucleation behavior.
  • Solid surfaces can induce new limits of solution instability.