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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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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.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
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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.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
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Intermolecular Forces and Physical Properties02:56

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Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation04:01

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Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws.
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Assembly Multifunctional Three-Dimensional Carbon Networks by Controlling Intermolecular Forces.

Simi Sui1,2, Shan Zhu1, Lina Su1

  • 1School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials , Tianjin University , Tianjin 300350 , China.

ACS Applied Materials & Interfaces
|October 2, 2018
PubMed
Summary

Researchers controlled the assembly forms of three-dimensional carbon networks (3DCNs) by tuning intermolecular forces. This manipulation enabled the creation of powders, monoliths, and clay-like materials with tailored properties for diverse applications.

Keywords:
carbon nanostructureshydrogen bondsmultifunctional materialsself-assemblyvan der Waals forces

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Three-dimensional carbon networks (3DCNs) offer high surface area, efficient mass transfer, and mechanical stability.
  • The macroscopic assembly form significantly influences the physicochemical properties of 3DCNs.

Purpose of the Study:

  • To investigate the relationship between intermolecular forces and the macroscale assembly forms of 3DCNs.
  • To demonstrate control over 3DCN assembly for tailored material properties.

Main Methods:

  • Synthesized 3DCNs and manipulated intermolecular forces (van der Waals, hydrogen bonding) through N-doping and aniline molecule introduction.
  • Characterized the assembly forms (powder, monolith, clay) and their mechanical properties.

Main Results:

  • Weak van der Waals forces resulted in 3DCN powders.
  • Enhanced van der Waals forces via N-doping enabled monolith formation with high load-bearing capacity (43,000x weight).
  • Hydrogen bonding introduced by aniline transformed 3DCNs into a ductile and plastic clay-like material.

Conclusions:

  • Intermolecular forces are critical for controlling the macroscale assembly of 3DCNs.
  • Engineered 3DCN composites with controllable forms show promise for various applications, including functionalized materials.