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Related Concept Videos

Analyte Adsorption and Distribution01:09

Analyte Adsorption and Distribution

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In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
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Extraction: Partition and Distribution Coefficients01:14

Extraction: Partition and Distribution Coefficients

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The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
For extracting a solute from an aqueous phase into an...
1.7K
Arrhenius Plots02:34

Arrhenius Plots

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The Arrhenius equation relates the activation energy and the rate constant, k, for chemical reactions. In the Arrhenius equation, k = Ae−Ea/RT, R is the ideal gas constant, which has a value of 8.314 J/mol·K, T is the temperature on the kelvin scale, Ea is the activation energy in J/mole, e is the constant 2.7183, and A is a constant called the frequency factor, which is related to the frequency of collisions and the orientation of the reacting molecules.
The Arrhenius equation can be used...
38.5K
Calculating Equilibrium Concentrations02:05

Calculating Equilibrium Concentrations

47.4K
Being able to calculate equilibrium concentrations is essential to many areas of science and technology—for example, in the formulation and dosing of pharmaceutical products. After a drug is ingested or injected, it is typically involved in several chemical equilibria that affect its ultimate concentration in the body system of interest. Knowledge of the quantitative aspects of these equilibria is required to compute a dosage amount that will solicit the desired therapeutic effect.
A more...
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The Equilibrium Binding Constant and Binding Strength02:18

The Equilibrium Binding Constant and Binding Strength

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The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
12.8K
Calculating the Equilibrium Constant02:46

Calculating the Equilibrium Constant

30.8K
The equilibrium constant for a reaction is calculated from the equilibrium concentrations (or pressures) of its reactants and products. If these concentrations are known, the calculation simply involves their substitution into the Kc expression.
For example, gaseous nitrogen dioxide forms dinitrogen tetroxide according to this equation:
30.8K

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Updated: Jun 1, 2025

Study of Short Peptide Adsorption on Solution Dispersed Inorganic Nanoparticles Using Depletion Method
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Introducing the Adsorption Energy Distribution Calculation for Two-Component Competitive Adsorption Isotherm Data.

Abdul Haseeb1, Yosief Wondmagegne2, Miguel X Fernandes1

  • 1Department of Engineering and Chemical Sciences, Karlstad University, SE-651 88 Karlstad, Sweden.

Analytical Chemistry
|January 21, 2025
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Summary
This summary is machine-generated.

This study introduces a new method to calculate the Adsorption Energy Distribution (AED) for two-component systems. This approach visualizes competitive adsorption, aiding in selecting accurate models for chromatography.

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Area of Science:

  • Physical Chemistry
  • Chemical Engineering
  • Analytical Chemistry

Background:

  • Adsorption Energy Distribution (AED) is key to understanding adsorption processes.
  • Current methods often struggle with multicomponent systems.
  • Accurate modeling is vital for chromatography optimization.

Purpose of the Study:

  • To develop a novel method for calculating the simultaneous AED of two components.
  • To provide insights into competitive adsorption mechanisms.
  • To offer an alternative adsorption isotherm model without assuming heterogeneity.

Main Methods:

  • Utilized competitive adsorption isotherm data for AED calculation.
  • Developed a two-component AED model.
  • Tested the model on both synthetic and experimental data.

Main Results:

  • Successfully enabled the simultaneous AED calculation for two components.
  • Demonstrated visualization of competitive adsorption processes.
  • Showcased the model's effectiveness in assisting adsorption model selection.

Conclusions:

  • The two-component AED is a powerful tool for understanding multicomponent interactions.
  • This method enhances mechanistic modeling for preparative chromatography.
  • The approach offers a viable alternative to traditional isotherm models.