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Related Concept Videos

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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The Colloidal State01:29

The Colloidal State

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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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Factors Affecting Dissolution: Particle Size and Effective Surface Area01:23

Factors Affecting Dissolution: Particle Size and Effective Surface Area

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Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are...
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Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

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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...
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Coagulation01:06

Coagulation

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Theories of Dissolution: Diffusion Layer Model01:15

Theories of Dissolution: Diffusion Layer Model

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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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Cooling Particle-Coated Bubbles: Destabilization beyond Dissolution Arrest.

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Decreasing temperature destabilizes particle-coated microbubbles by increasing gas solubility, leading to undersaturation. This phenomenon impacts foam stability and has implications for controlled release applications.

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Area of Science:

  • Colloid and surface science
  • Materials science
  • Physical chemistry

Background:

  • Stable emulsions and foams are crucial in various industries, including food and personal care.
  • Particle-stabilized foams offer enhanced long-term stability compared to surfactant-stabilized foams.
  • Solid particles can inhibit bubble dissolution, a process driven by Laplace pressure.

Purpose of the Study:

  • To experimentally investigate the impact of temperature changes on the stability and lifetime of particle-coated air microbubbles in water.
  • To elucidate the mechanisms by which temperature variations affect microbubble dissolution and destabilization.
  • To explore the implications of bubble dissolution pathways on particle coating integrity and potential controlled release.

Main Methods:

  • Experimental study of particle-coated air microbubbles in water under varying temperature conditions.
  • Utilizing a quasi-steady model to analyze temperature-dependent mass transfer effects.
  • Conducting experiments at constant temperature to isolate the impact of gas undersaturation.

Main Results:

  • A decrease in temperature was found to destabilize particle-coated microbubbles, overriding dissolution arrest.
  • Increased gas solubility at lower temperatures leads to undersaturation, identified as the primary destabilization mechanism.
  • Undersaturation alone can induce particle-coated bubble destabilization, even when Laplace pressure is negligible.
  • Bubble dissolution can result in coating buckling or particle expulsion, influenced by the particle-to-bubble size ratio.

Conclusions:

  • Temperature is a critical factor influencing the stability of particle-coated microbubbles, with cooling promoting destabilization.
  • Gas undersaturation, driven by temperature-dependent solubility, is a key mechanism for microbubble destabilization.
  • The observed dissolution pathways offer insights into potential applications for controlled release technologies.