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Related Concept Videos

Intermolecular Forces03:13

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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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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.
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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
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Hydration Repulsion between Carbohydrate Surfaces Mediated by Temperature and Specific Ions.

Hsieh Chen1, Jason R Cox1, Hooisweng Ow1

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Polysaccharide-coated nanoparticles exhibit ion-specific colloidal stability at high temperatures. Calcium ions (CaCl2) enhance stability, while magnesium ions (MgCl2) cause aggregation, revealing a new hydration mechanism.

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Area of Science:

  • Colloid and surface science
  • Materials science
  • Computational chemistry

Background:

  • Colloidal stability depends on surface charges, steric repulsion, and hydration forces versus van der Waals attractions.
  • High temperatures and electrolyte concentrations typically reduce colloidal stability in suspensions.

Purpose of the Study:

  • To investigate the ion-specific colloidal stability of polysaccharide-coated nanoparticles at high temperatures.
  • To elucidate the microscopic mechanisms governing this ion-specific stability using atomistic simulations.

Main Methods:

  • Experimental observation of nanoparticle behavior in different electrolyte solutions (CaCl2 and MgCl2) at high temperatures.
  • Atomistic simulations to probe the interactions between ions, nanoparticles, and water molecules.

Main Results:

  • Dextran-coated nanoparticles showed enhanced colloidal stability in CaCl2 solutions.
  • Rapid nanoparticle aggregation was observed in MgCl2 solutions.
  • Atomistic simulations revealed that surface-bound Ca(2+) ions enhance carbohydrate hydration and create long-range repulsive water structures.

Conclusions:

  • Ion-specific interactions, particularly the hydration effects of strongly bound ions like Ca(2+), are crucial for colloidal stability under extreme conditions.
  • Leveraging ion binding to macromolecular surfaces offers a new strategy for achieving absolute hydration and colloidal stability.
  • This finding has implications for stabilizing various materials, especially in high-temperature and high-electrolyte environments.