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Related Concept Videos

Diffusion01:12

Diffusion

228.5K
Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion01:21

Diffusion

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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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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.
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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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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Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models00:57

Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models

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Physiological pharmacokinetic models, often called flow-limited or perfusion models, typically assume a swift drug distribution between tissue and venous blood, creating a rapid drug equilibrium. This premise is based on the idea that drug diffusion is extremely fast, and the cell membrane presents no barrier to drug permeation. In this scenario, where no drug binding occurs, the drug concentration in the tissue equals that of the venous blood leaving the tissue. This greatly simplifies the...
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Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

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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.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting...
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Visualizing Diffusional Dynamics of Gold Nanorods on Cell Membrane using Single Nanoparticle Darkfield Microscopy
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A High Diffusive Model for Nanomaterials.

P Di Sia1,2, V Dallacasa3,4

  • 1Department of Computer Science, Faculty of Science, Verona University, Strada Le Grazie 15, 37134, Verona, Italy. paolo.disia@univr.it.

Nanoscale Research Letters
|August 10, 2016
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Summary
This summary is machine-generated.

This study introduces a new model to understand carrier dynamics in advanced solar energy materials. The findings reveal fast diffusion in these materials, crucial for enhancing device efficiency.

Keywords:
Correlation FunctionsDiffusionFrequency-Dependent Complex ConductivityMontecarlo SimulationNanostructuresSemiconducting Oxides

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Photochemistry

Background:

  • Films are crucial for photocatalytic and solar energy devices, but their carrier transport mechanisms remain unclear.
  • Optimizing electronic time response after photogeneration is key for device performance.

Purpose of the Study:

  • To develop a model for calculating correlation functions to understand carrier dynamics.
  • To investigate transport processes in materials like TiO2 and doped Si.

Main Methods:

  • A model for calculating correlation functions was developed.
  • The model utilizes the Fourier transform of frequency-dependent complex conductivity.
  • Calculations were performed for velocity correlation functions, mean square position deviation, and diffusion coefficient.

Main Results:

  • Fast diffusion was observed in short time intervals, on the order of a few collision times.
  • Results were presented for titanium dioxide (TiO2) and doped silicon (Si).
  • The study quantifies carrier dynamics relevant to current device applications.

Conclusions:

  • Fast carrier response is demonstrated, with implications for nanostructured device efficiency.
  • The developed model provides insights into unresolved transport processes in optoelectronic films.
  • Understanding these dynamics is vital for advancing solar energy conversion technologies.