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Related Concept Videos

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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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 and Physical Properties02:56

Intermolecular Forces and Physical Properties

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

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

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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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Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers
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Intramolecular Force Mapping at Room Temperature.

Timothy Brown1, Philip James Blowey1, Jack Henry1

  • 1The School of Physics and Astronomy, Bragg Centre for Materials Research, The University of Leeds, Leeds LS2 9JT, United Kingdom.

ACS Nano
|January 5, 2023
PubMed
Summary
This summary is machine-generated.

High-resolution atomic force microscopy is now possible at room temperature. New methods overcome limitations, enabling detailed molecular analysis without cryogenic cooling.

Keywords:
NC-AFMSPMforce mappingforce spectroscopysingle moleculesubmolecular

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Area of Science:

  • Surface science
  • Atomic force microscopy
  • Nanotechnology

Background:

  • Noncontact atomic force microscopy (NC-AFM) provides atomic-scale material characterization.
  • Intramolecular force mapping traditionally requires cryogenic temperatures for tip stability and resolution.

Purpose of the Study:

  • To demonstrate high-resolution, three-dimensional force mapping of single organic molecules at room temperature.
  • To overcome the limitations of cryogenic operation in atomic force microscopy.

Main Methods:

  • Utilized semiconducting materials for tip apex robustness and to inhibit molecular diffusion.
  • Implemented atom tracking-based feedforward correction to manage thermal drift.
  • Achieved submolecular resolution force mapping without cryogenic cooling.

Main Results:

  • Demonstrated room-temperature, three-dimensional force maps with spatial and force resolution comparable to cryogenic methods.
  • Enabled quantitative analysis of adsorption-induced geometric changes in molecules at the picometer level.
  • Showcased the stability of functionalized tips at room temperature using novel materials.

Conclusions:

  • High-resolution intramolecular force mapping is feasible at room temperature.
  • The developed methods significantly advance the accessibility and applicability of atomic force microscopy for molecular studies.
  • Opens new avenues for studying molecular behavior and interactions under ambient conditions.