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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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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 (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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Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
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Nanoconfinement Effects on Intermolecular Forces Observed via Dewetting.

Tara T Huang1, Evon S Petek1, Reika Katsumata1

  • 1Department of Polymer Science and Engineering, University of Massachusetts Amherst 120 Governors Dr, Amherst, Massachusetts 01003, United States.

Nano Letters
|November 19, 2025
PubMed
Summary
This summary is machine-generated.

Nanoconfinement significantly alters intermolecular forces in ultrathin films, impacting stability. Adjusting underlying layer thickness offers a novel way to control film behavior without changing surface chemistry.

Keywords:
DewettingHamaker constantIntermolecular forcesMultilayer polymer filmsNanoconfinement effects

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Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Surface Chemistry

Background:

  • Wettability arises from molecular forces like van der Waals (vdW) forces.
  • The effect of nanoconfinement on intermolecular interactions and ultrathin film stability is not well understood.

Purpose of the Study:

  • To investigate how nanoconfinement influences intermolecular interactions in soft matter.
  • To explore the impact of nanoconfinement on the stability of ultrathin films.
  • To develop a theoretical framework that accounts for nanoconfinement effects on film dewetting.

Main Methods:

  • Utilized a polystyrene (PS)/poly(methyl methacrylate) (PMMA)/PS trilayer system.
  • Varied the thickness of the middle PMMA layer from 15 to 95 nm.
  • Incorporated nanoconfinement-induced changes in the PMMA refractive index into theoretical models.

Main Results:

  • The dewetting behavior of the top PS layer strongly depended on the PMMA layer thickness.
  • Observed deviations from classical vdW-based predictions that assume bulk properties.
  • Successfully captured experimental observations by modifying the theoretical framework with nanoconfinement effects.

Conclusions:

  • Nanoconfinement in soft matter significantly influences long-range intermolecular interactions.
  • Film stability can be modulated by adjusting the underlying layer thickness.
  • This offers a new strategy for performance-targeted interface design in functional films.