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Videos de Conceptos Relacionados

Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

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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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Crystal Growth: Principles of Crystallization01:25

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.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
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Precipitation Processes01:12

Precipitation Processes

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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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Colloidal precipitates01:09

Colloidal precipitates

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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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Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism01:21

Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism

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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...
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Types of Coprecipitation01:10

Types of Coprecipitation

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Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
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Cristalización Heterogénea en Diferentes Superficies Húmedas

Tiantian Li1, Jianwen Zhang1, Jiashun Li1

  • 1State Key Laboratory for Environment-Friendly Energy Materials, School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, PR China.

Langmuir : the ACS journal of surfaces and colloids
|December 23, 2025
PubMed
Resumen

La mejora de la humectación de la superficie aumenta la barrera de nucleación, inhibiendo la cristalización y la incrustación. Las superficies superhidrofóbicas estables, como las micro-nano estructuras, reducen significativamente la incrustación de carbonato de calcio para aplicaciones antincrustantes a largo plazo.

Palabras clave:
superficies superhidrofóbicasincrustación de carbonato de calciobarrera de nucleaciónhumectación de superficiesaplicaciones industrialessoluciones antincrustantes

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Área de la Ciencia:

  • Ciencia de Materiales
  • Química de Superficies
  • Nanotecnología

Sus antecedentes:

  • La incrustación en las interfaces sólido-líquido plantea desafíos en aplicaciones industriales como el transporte por tuberías y la anticorrosión de metales.
  • Comprender la relación entre los estados de humectación de la superficie y la inhibición de la cristalización es crucial para desarrollar soluciones antincrustantes eficaces.

Objetivo del estudio:

  • Investigar el mecanismo de incrustación en superficies con diferentes estados de humectación (planas, micro, nano, micro-nano).
  • Explorar el potencial de las superficies superhidrofóbicas estables para aplicaciones antincrustantes a largo plazo.

Principales métodos:

  • Fabricación de cuatro estructuras de superficie representativas: plana, micro, nano y micro-nano.
  • Evaluación de las barreras de nucleación heterogénea en diferentes estados de humectación.
  • Evaluación de las tasas de incrustación de carbonato de calcio (CaCO3) en diversas superficies durante 42 días y en condiciones dinámicas.

Principales resultados:

  • Los estados de humectación mejorada influyen positivamente en la barrera de nucleación heterogénea, inhibiendo la cristalización.
  • Las superficies superhidrofóbicas en estado Cassie exhiben altas barreras de nucleación pero pueden transicionar a estados de Wenzel, limitando la acción antincrustante a largo plazo.
  • La superficie micro-nano demostró una estabilidad superior, reduciendo la tasa de incrustación de CaCO3 de 1,24 mg/cm2 a 0,335 mg/cm2 después de 42 días.

Conclusiones:

  • Lograr una acción antincrustante a largo plazo requiere una superhidrofobicidad estable en estado Cassie.
  • Las estrategias de diseño de superficies centradas en la superhidrofobicidad estable son esenciales para soluciones antincrustantes eficaces en entornos industriales.