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Solvents01:12

Solvents

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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.
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Titration in Nonaqueous Solvents01:16

Titration in Nonaqueous Solvents

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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,...
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Regulation of Sodium and Potassium01:26

Regulation of Sodium and Potassium

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The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP).
Sodium Regulation
Sodium ions make up approximately 90% of extracellular cations, with a normal blood plasma concentration of 136–148 mEq/L. A decrease in blood volume and pressure triggers the release of renin from granular cells in the juxtaglomerular complex (JGC), primarily...
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Roles of Electrolytes: Sodium and Potassium01:24

Roles of Electrolytes: Sodium and Potassium

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Sodium plays a crucial role in maintaining fluid and electrolyte balance and overall bodily homeostasis. Sodium balance is primarily regulated by kidney function, which adjusts sodium elimination to match dietary intake and maintain proper electrolyte levels. Sodium is the most abundant cation in the extracellular fluid (ECF) and is found in salts such as sodium chloride (NaCl) and sodium bicarbonate (NaHCO3). Although cellular plasma membranes are relatively impermeable to sodium, its role in...
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Antiepileptic Drugs: Sodium Channel Blockers01:08

Antiepileptic Drugs: Sodium Channel Blockers

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Antiepileptic drugs are specialized medications that prevent seizures in individuals diagnosed with epilepsy. These drugs primarily function by blocking the movement of sodium ions through channels in the neuronal membrane, inhibiting the repetitive firing of action potentials often associated with seizures.
Sodium channel blockers modulate ion channels, particularly voltage-gated sodium channels. They block only sodium ion movement.
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Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

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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...
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Supramolecular hydrogel based on a sodium deep eutectic solvent.

Catarina Florindo1, Lucas G Celia-Silva, Luís F G Martins

  • 1Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. Da República, 2780-157, Oeiras, Portugal. isabel.marrucho@tecnico.ulisboa.pt.

Chemical Communications (Cambridge, England)
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This study introduces the first supramolecular hydrogel utilizing a metal-containing deep eutectic solvent (DES). Researchers mapped its phase diagram and analyzed its rheological properties, paving the way for new material applications.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Green Chemistry

Background:

  • Deep eutectic solvents (DES) offer tunable properties and environmental benefits.
  • Supramolecular hydrogels are advanced materials with diverse applications.
  • Metal-containing compounds can impart unique functionalities to materials.

Purpose of the Study:

  • To report the novel development of a supramolecular hydrogel based on a metal-containing deep eutectic solvent (DES).
  • To characterize the phase behavior of this new DES-based hydrogel.
  • To investigate the rheological properties of the developed hydrogel system.

Main Methods:

  • Synthesis of a metal-containing deep eutectic solvent.
  • Formation and characterization of the supramolecular hydrogel.
  • Phase diagram determination using established methods.
  • Rheological measurements to assess material properties.

Main Results:

  • Successful formation of a supramolecular hydrogel from a metal-containing DES.
  • Detailed phase diagram illustrating the hydrogel's stability regions.
  • Comprehensive rheological data indicating specific material behaviors.

Conclusions:

  • The metal-containing DES hydrogel represents a novel class of supramolecular materials.
  • The characterized phase diagram and rheological properties provide a foundation for its application.
  • This work expands the scope of DES applications in advanced material design.