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Solvents01:12

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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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The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Force On A Current Loop In A Magnetic Field01:17

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Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
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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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Preparation of Binary and Ternary Deep Eutectic Systems
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OPLS Force Field for Choline Chloride-Based Deep Eutectic Solvents.

Brian Doherty1, Orlando Acevedo1

  • 1Department of Chemistry , University of Miami , Coral Gables , Florida 33146 , United States.

The Journal of Physical Chemistry. B
|August 21, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed OPLS-DES, a force field for deep eutectic solvents (DES). This model accurately predicts physical properties and interactions for choline chloride-based DES, advancing their application in various fields.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Materials Science

Background:

  • Deep eutectic solvents (DES) are cost-effective and eco-friendly alternatives to traditional solvents.
  • Choline chloride-based DES are widely used in materials science, separations, and nanotechnology.
  • Accurate molecular modeling is crucial for understanding and optimizing DES behavior.

Purpose of the Study:

  • To develop and validate a transferable nonpolarizable force field (OPLS-DES) for choline chloride-based DES.
  • To accurately reproduce bulk-phase physical properties and local intermolecular interactions.
  • To assess the performance of the force field against experimental data and simulations.

Main Methods:

  • Development of transferable parameters for 8 choline chloride-based DES.
  • Utilizing the OPLS-DES nonpolarizable force field.
  • Comparison with experimental data (densities, viscosities, heat capacities, surface tensions).
  • Validation against radial distribution functions and coordination numbers from neutron diffraction and first-principles molecular dynamics.

Main Results:

  • OPLS-DES achieved near quantitative agreement for densities (1.1% MAE), viscosities (1.6% MAE), and surface tensions (1.5% MAE).
  • Heat capacities were reproduced with a 5.5% MAE.
  • Local interactions and solvent structuring were accurately captured.
  • Transport properties, like self-diffusion coefficients, presented challenges near room temperature.

Conclusions:

  • The OPLS-DES force field provides a reliable tool for simulating choline chloride-based DES properties and interactions.
  • The model shows excellent predictive power for bulk and local properties.
  • Recommendations for simulating transport properties include higher temperatures or polarizable force fields.