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Related Concept Videos

Theories of Dissolution: Diffusion Layer Model01:15

Theories of Dissolution: Diffusion Layer Model

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.
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
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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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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 employed to...

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Nanorod Diffusion near the Solid-Liquid Interface with Varied Wall Nonuniformity.

Jingbin Yang1, Lijun Yang1,2, Ruo-Yu Dong1,2

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This study reveals that patterned walls with tunable nonuniformity significantly hinder nanorod diffusion. Modifying interfacial interactions alters diffusion modes, impacting nanoparticle transport near solid-liquid interfaces.

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Area of Science:

  • Physics
  • Materials Science
  • Chemistry

Background:

  • Nanoparticle diffusion near interfaces is crucial for biological and technological applications.
  • Limited systematic studies exist on tuning interfacial interactions or using nonuniform walls to influence nanorod diffusion.

Purpose of the Study:

  • To investigate the rotational and translational diffusion dynamics of single nanorods (NRs) near solid-liquid interfaces.
  • To explore the effects of patterned walls with adjustable nonuniformity on NR diffusion.

Main Methods:

  • Utilized molecular dynamics simulations to model NR diffusion.
  • Constructed patterned walls by modifying NR-wall interactions.
  • Analyzed diffusion trajectories and energy interactions.

Main Results:

  • Patterned walls with nonuniformity were found to limit both translational and rotational diffusion of NRs.
  • Diffusion coefficients and exponents decreased due to wall nonuniformity.
  • Three distinct diffusion modes were identified: Fickian diffusion, desorption-mediated flight, and in-plane diffusion.
  • NR-wall interactions, influenced by rotational diffusion, drive these diffusion states.

Conclusions:

  • Adjusting interfacial properties via patterned walls offers a method to control nanoparticle diffusion.
  • Understanding these anisotropic diffusion behaviors provides insights into nanoparticle transport in confined systems.
  • This research deepens the understanding of nanoparticle interfacial diffusion and transport mechanisms.