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Crystal Growth: Principles of Crystallization

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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 high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
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After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
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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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Nucleation of Chemically Active Droplets.

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Driven chemical reactions can suppress droplet nucleation by stabilizing the homogeneous state. This work provides a model to predict nucleation times and construct phase diagrams for active droplets in cells and chemical engineering.

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Area of Science:

  • Chemical kinetics
  • Cell biology
  • Physical chemistry

Background:

  • Active droplets, driven by chemical reactions, are crucial for cellular organization.
  • Controlling droplet nucleation is essential for cellular function.
  • Understanding how reactions influence nucleation is key for both biological and chemical systems.

Purpose of the Study:

  • To investigate how driven chemical reactions affect droplet nucleation.
  • To develop a predictive model for nucleation times in active droplets.
  • To map the phase diagram of homogeneous and droplet states influenced by reactions.

Main Methods:

  • Numerical simulations of driven chemical reactions.
  • Development of an equilibrium surrogate model.
  • Phase diagram construction.

Main Results:

  • Chemical reactions generally suppress nucleation when they stabilize the homogeneous state.
  • Reactions increase the effective energy barrier for nucleation.
  • The surrogate model enables quantitative predictions of delayed nucleation times.

Conclusions:

  • Driven reactions significantly delay droplet nucleation by increasing the energy barrier.
  • The developed phase diagram accurately summarizes reaction effects on phase stability.
  • Findings are relevant for understanding active droplets in biological cells and chemical engineering applications.