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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
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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

Intermolecular Forces in Solutions

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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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Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility02:34

Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility

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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 vs Intramolecular Forces03:00

Intermolecular vs Intramolecular Forces

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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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Related Experiment Video

Updated: Jan 8, 2026

Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
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Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method

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Measuring Molecular Forces With Atomic Force Microscopy 1: Solvent Influence on Hydrophobic Interactions.

Luis N Ponce-Gonzalez1, José L Toca-Herrera1

  • 1BOKU University, Institute of Biophysics, Vienna, Austria.

Microscopy Research and Technique
|December 19, 2025
PubMed
Summary
This summary is machine-generated.

The origin of hydrophobic interactions, crucial for molecular self-assembly, remains unclear. This study used atomic force microscopy (AFM) to investigate how solvent polarity affects these forces on fluorocarbon surfaces.

Keywords:
DMSOatomic force microscopychemical vapor depositionfluorocarbongoldhydrophobic interactionsvan der Waals forces

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Investigating Single Molecule Adhesion by Atomic Force Spectroscopy

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Biophysics

Background:

  • Hydrophobic interactions are fundamental to molecular self-assembly, protein folding, and aggregation.
  • The precise origins and characteristics of hydrophobic forces, including their strength and range compared to van der Waals (vdW) forces, are not fully understood.
  • Potential contributing factors include water structuring, polarization effects, and entropic contributions.

Purpose of the Study:

  • To investigate the impact of solvent polarity on hydrophobic interactions.
  • To explore the behavior of hydrophobic forces in water:DMSO binary solvent mixtures.
  • To contribute to understanding the fundamental mechanisms driving hydrophobic phenomena.

Main Methods:

  • Preparation of fluorocarbon surfaces on gold substrates using chemical vapor deposition (CVD).
  • Utilized atomic force microscopy (AFM) to measure force-distance curves.
  • Applied an extended van der Waals (vdW) model to analyze the measured forces.

Main Results:

  • Characterized hydrophobic interactions between surfaces in varying water:DMSO mixtures.
  • Quantified the influence of medium polarity on the measured hydrophobic forces.
  • Demonstrated that solvent composition significantly alters hydrophobic interaction profiles.

Conclusions:

  • Hydrophobic interactions are strongly modulated by the polarity of the surrounding solvent medium.
  • The study provides experimental insights into the nature of hydrophobic forces.
  • Findings contribute to a deeper understanding of molecular interactions in complex solvent systems.