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Related Concept Videos

Solution Formation02:16

Solution Formation

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There is no one solvent that can dissolve every type of solute. Some substances that readily dissolve in a certain solvent might be insoluble in a different solvent. A simple way to predict which substances dissolve in which solvent is the phrase "like dissolves like". This means that polar substances, such as salt and sugar, dissolve in a polar substance like water. In contrast, non-polar substances are more soluble in non-polar solvents such as carbon tetrachloride.
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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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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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Solubility Equilibria: Overview01:09

Solubility Equilibria: Overview

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When a substance such as sodium chloride is added to water, it dissolves, forming an aqueous solution. The extent of dissolution is called solubility. The process of dissolution can exist in equilibrium, just like other chemical processes. Solubility equilibria are also called precipitation equilibria because the process of solubility can be reversible. The reverse of the solubility process is called precipitation.
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Energetics of Solution Formation02:35

Energetics of Solution Formation

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The formation of a solution is an example of a spontaneous process, which is a process that occurs under specified conditions without energy from some external source.
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Entropy and Solvation02:05

Entropy and Solvation

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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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Accessible solitons in diffusive media.

Alessandro Alberucci, Chandroth P Jisha, Gaetano Assanto

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    Summary
    This summary is machine-generated.

    We studied spatial solitons in nonlocal materials, finding they require a minimum power threshold for existence. Increased nonlocality expands the conditions for these solitons, crucial for real-world applications.

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    Area of Science:

    • Nonlinear optics
    • Condensed matter physics

    Background:

    • Spatial solitons are self-reinforcing light beams in nonlinear media.
    • Nonlocal nonlinear media exhibit responses that depend on a region, not just a point.
    • Understanding soliton behavior in such media is key for optical devices.

    Purpose of the Study:

    • To investigate the existence and properties of spatial solitons in nonlocal nonlinear media.
    • To analyze the influence of nonlocality and boundary conditions on soliton formation.
    • To evaluate the accuracy of the highly nonlocal approximation for these solitons.

    Main Methods:

    • Modeling the nonlinear refractive index with a diffusive equation.
    • Analyzing the interplay between nonlocality and boundary conditions.
    • Determining the power threshold for symmetric soliton existence.

    Main Results:

    • Symmetric spatial solitons exist only above a critical power threshold.
    • The existence region for solitons expands with increasing nonlocality.
    • The study discusses the accuracy of the highly nonlocal approximation.

    Conclusions:

    • Nonlocality significantly impacts the existence and behavior of spatial solitons.
    • The findings provide insights into accessible solitons in practical optical systems.
    • Accurate modeling requires careful consideration of nonlocality and boundary effects.