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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...
Speed of Sound in Solids and Liquids00:51

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As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
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Theories of Dissolution: Diffusion Layer Model01:15

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Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the concentration...

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Variación de la velocidad de disolución del cristal basada en un modelo de onda escalonada de disolución.

A C Lasaga1, A Luttge

  • 1Department of Geology and Geophysics, Yale University, New Haven, CT 06520, USA.

Science (New York, N.Y.)
|March 27, 2001
PubMed
Resumen

Las ondas escalonadas de disolución generadas por defectos explican las tasas de disolución de los cristales lejos del equilibrio. Este nuevo marco se extiende a las condiciones de casi equilibrio, revelando una disminución de la tasa no lineal a medida que se aproxima el equilibrio.

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Área de la Ciencia:

  • La geoquímica es la geoquímica.
  • Ciencia de los materiales Ciencia de los materiales.
  • Ingeniería Química Ingeniería Química.

Sus antecedentes:

  • Comprender la disolución de los cristales es crucial para los procesos geoquímicos e industriales.
  • Los modelos existentes a menudo tienen dificultades para predecir con precisión las tasas de disolución en condiciones variables, especialmente lejos del equilibrio.

Objetivo del estudio:

  • Validar una nueva formulación para las tasas de disolución de cristales basada en ondas escalonadas generadas por defectos.
  • Proporcionar un marco conceptual para la disolución de minerales en una variedad de condiciones, desde lejos del equilibrio hasta cerca del equilibrio.

Principales métodos:

  • Observaciones de la superficie a una escala casi atómica.
  • Las simulaciones de Monte Carlo.
  • Determinación experimental de las tasas de disolución a granel.

Principales resultados:

  • Validación de una formulación para las tasas de disolución vinculadas a ondas escalonadas generadas por defectos.
  • Se demostró que estas ondas escalonadas difieren de los mecanismos de crecimiento en espiral.
  • Estableció un marco que explica las tasas de disolución masiva, particularmente lejos del equilibrio.

Conclusiones:

  • El modelo de onda escalonada de disolución generada por defectos predice con precisión las tasas de disolución de los cristales.
  • El modelo se extiende a condiciones cercanas al equilibrio, prediciendo una disminución no lineal en la velocidad de disolución.
  • Los hallazgos tienen implicaciones tanto para los procesos de reacción sólido-líquido naturales como para los artificiales.