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Related Concept Videos

Intermolecular Forces03:13

Intermolecular Forces

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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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Intermolecular Forces in Solutions02:28

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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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Van der Waals Interactions01:24

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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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Intermolecular vs Intramolecular Forces03:00

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Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
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Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Interchain Hydrodynamic Interaction and Internal Friction of Polyelectrolytes.

Ekaterina Buvalaia1, Margarita Kruteva1, Ingo Hoffmann2

  • 1Jülich Centre for Neutron Science JCNS and Institute of Biological Information Processing IBI, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.

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Polyelectrolyte dynamics reveal that local chain movements are decoupled from interactions between chains. Hydrodynamic interactions persist between polyelectrolytes, and friction increases with ion condensation.

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Area of Science:

  • Polymer Physics
  • Solution Chemistry

Background:

  • Polyelectrolytes (PE) are charged polymers in solution, with structure and dynamics influenced by electrostatic, excluded volume, and hydrodynamic interactions.
  • Understanding PE behavior is crucial for applications in materials science, nanotechnology, and biological systems.

Purpose of the Study:

  • To investigate the dynamics of polyelectrolytes in dilute to semidilute solutions.
  • To correlate macroscopic diffusion with segmental chain dynamics and interchain interactions.

Main Methods:

  • Dynamic Light Scattering (DLS)
  • Neutron Spin Echo (NSE) spectroscopy
  • Pulsed Field Gradient Nuclear Magnetic Resonance (PFG-NMR) spectroscopy

Main Results:

  • A decoupling between local chain dynamics and interchain interactions was observed.
  • Collective diffusion aligns with a colloidal model incorporating electrostatic and hydrodynamic effects.
  • Chain dynamics follow the Zimm model, with internal friction increasing due to ion condensation.

Conclusions:

  • Hydrodynamic interactions are not completely screened between polyelectrolyte chains.
  • Increased ion condensation leads to higher internal friction within polyelectrolyte chains.
  • The study provides insights into the complex interplay of forces governing polyelectrolyte behavior in solution.