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Related Concept Videos

Solvents01:12

Solvents

70.2K
A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
A...
70.2K
Titration in Nonaqueous Solvents01:16

Titration in Nonaqueous Solvents

1.4K
Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
1.4K
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

17.6K
Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
17.6K
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

1.3K
In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
1.3K
Ionic Bonds00:42

Ionic Bonds

129.5K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
129.5K
Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

68.1K
Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
68.1K

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Solvent Bonding for Fabrication of PMMA and COP Microfluidic Devices
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Solvent Bonding for Fabrication of PMMA and COP Microfluidic Devices

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Micro-solvent cluster extraction using aqueous mixed solvents of ionic liquid.

Thiraporn Charoenraks1, Masaaki Tabata, Kenta Fujii

  • 1Department of Chemistry, Faculty of Science and Engineering, Saga University, Japan.

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
|October 11, 2008
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Summary

Ionic liquids in aqueous solutions enable efficient separation of organic compounds without columns. This novel method utilizes micro-solvent clusters and polymers for enhanced analytical separations.

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Area of Science:

  • Analytical Chemistry
  • Separation Science
  • Physical Chemistry

Background:

  • Traditional separation techniques often require specialized columns and solvents.
  • Ionic liquids offer unique properties for developing novel separation methods.
  • Understanding solvent-analyte interactions is crucial for optimizing separations.

Purpose of the Study:

  • To develop a column-free separation method for organic compounds using ionic liquids.
  • To investigate the role of micro-solvent cluster formation in separation.
  • To evaluate the impact of polymers on separation efficiency.

Main Methods:

  • Utilized a fused silica capillary tube with an aqueous ionic liquid solvent (1-butyl-3-methylimidazolium chloride).
  • Employed large angle X-ray scattering (LAXS) to study micro-solvent cluster formation.
  • Incorporated polyvinylpyrrolidone (PVP) to enhance separation performance.

Main Results:

  • Achieved sufficient separation of organic compounds (2-naphthol, phenol, 4-chlorophenol, 4-nitrophenol) without a specific separation column.
  • Demonstrated micro-solvent cluster formation in aqueous ionic liquid mixtures.
  • Observed enhanced separation with the addition of PVP, with high theoretical plate numbers reported.

Conclusions:

  • The separation mechanism is attributed to the partition of analytes between micro-solvent clusters and organic solvent molecules.
  • This ionic liquid-based method offers a promising alternative for analytical separations.
  • The findings highlight the potential of ionic liquids and polymers in advanced separation technologies.