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Related Concept Videos

Factors Affecting Dissolution: Particle Size and Effective Surface Area01:23

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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

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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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Passive Diffusion: Overview and Kinetics01:17

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Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
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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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The pharmacokinetic journey of drugs from solid oral dosage forms into systemic circulation is multifaceted. It begins with disintegration, a prerequisite ensuring a solid dosage form's subdivision into minute particles. Dissolution occurs next as these granulated entities solubilize in gastrointestinal fluids. This solubilization is crucial for the succeeding stage, permeation, which describes the traversal of the drug across the intestinal membrane and its subsequent entry into the blood...
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Passive transport is a method of drug absorption where small, lipid-soluble drugs can move across the cell membrane. This movement happens along the concentration gradient, which is a natural flow from higher to lower concentration areas. The speed at which the drug moves is directly related to its lipid–water partition coefficient. This means that the more a drug dissolves in lipids, the faster it diffuses or spreads throughout the body. It is important to note that most drugs are either...
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The surface diffusivity of nanoparticles physically adsorbed at a solid-liquid interface.

Troy Singletary1, Nima Iranmanesh1, Carlos E Colosqui1,2,3

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This summary is machine-generated.

Small nanoparticles on surfaces exhibit enhanced mobility via stick-slip motion. Surface diffusivity is improved by specific conditions, impacting nanomaterial applications in liquid confinement.

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Area of Science:

  • Nanomaterials Science
  • Physical Chemistry
  • Surface Science

Background:

  • Small nanoparticles adsorbed to surfaces can exhibit significant in-plane mobility.
  • This mobility, driven by thermally activated stick-slip motion, can lead to surface diffusivities comparable to bulk diffusivity.
  • Understanding nanoparticle surface dynamics is crucial for applications in confined liquids.

Purpose of the Study:

  • To develop an analytical model predicting nanoparticle translational diffusivity on adsorbing surfaces.
  • To investigate the influence of hydrodynamic drag and solvation forces on surface mobility.
  • To identify conditions that enhance nanoparticle surface diffusivity.

Main Methods:

  • Development of an analytical model incorporating hydrodynamic drag and kinetic barriers.
  • Utilizing molecular dynamics simulations to validate theoretical predictions.
  • Analysis of nanoparticle-surface interactions, including Hamaker constant and metastable separations.

Main Results:

  • Surface diffusivity is enhanced when the Hamaker constant is below a critical value related to interfacial energy and particle size.
  • Specific metastable separations, on the order of molecular dimensions, further enhance surface diffusivity.
  • The model successfully predicts enhanced surface diffusivity under these conditions.

Conclusions:

  • Nanoparticle surface diffusivity is controllable through manipulation of interfacial properties and adsorption geometry.
  • Thermally activated stick-slip motion is a key mechanism for high surface mobility.
  • Findings have implications for nanomaterial applications in membrane separation, catalysis, and self-assembly.