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Related Concept Videos

Intermolecular Forces03:13

Intermolecular Forces

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 bonds, and dispersion...
Intermolecular Forces03:13

Intermolecular Forces

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 bonds, and dispersion...
Van der Waals Interactions01:24

Van der Waals Interactions

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.
Intermolecular Forces and Physical Properties02:56

Intermolecular Forces and Physical Properties

Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility02:34

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

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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Related Experiment Video

Updated: May 16, 2026

Fluorescence Recovery after Merging a Droplet to Measure the Two-dimensional Diffusion of a Phospholipid Monolayer
07:54

Fluorescence Recovery after Merging a Droplet to Measure the Two-dimensional Diffusion of a Phospholipid Monolayer

Published on: October 15, 2015

Interaction forces between DPPC bilayers on glass.

Raquel Orozco-Alcaraz1, Tonya L Kuhl

  • 1Department of Chemical Engineering and Materials Science, University of California-Davis, One Shields Avenue, Davis California 95616, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 4, 2012
PubMed
Summary
This summary is machine-generated.

Silica-supported lipid membranes exhibit electrostatic repulsion due to silica

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Last Updated: May 16, 2026

Fluorescence Recovery after Merging a Droplet to Measure the Two-dimensional Diffusion of a Phospholipid Monolayer
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Published on: October 15, 2015

Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
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Published on: April 19, 2021

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
07:31

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies

Published on: September 1, 2023

Area of Science:

  • Surface science
  • Biophysics
  • Materials science

Background:

  • Lipid membranes are crucial for biological functions.
  • Understanding interactions between lipid membranes and solid supports is essential for developing biosensors and drug delivery systems.
  • Silica and mica are common substrates for membrane studies.

Purpose of the Study:

  • To investigate the force-distance profiles between silica-supported lipid membranes and bare silica surfaces.
  • To compare the electrostatic interactions of lipid membranes on silica versus mica substrates.
  • To elucidate the role of substrate properties in membrane-substrate interactions.

Main Methods:

  • Utilized the surface force apparatus (SFA) to measure forces between surfaces.
  • Formed lipid membranes using Langmuir-Blodgett deposition of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC).
  • Studied interactions in aqueous environments.

Main Results:

  • Bare silica surfaces exhibit long-range electrostatic repulsion and short-range steric repulsion in water.
  • Lipid membranes partially screen the electrostatic repulsion from silica.
  • A van der Waals adhesion comparable to mica-supported membranes was observed for silica-supported membranes.
  • Electrostatic repulsion was almost completely screened for lipid membranes on mica.
  • Differences attributed to substrate roughness and lipid physisorption.

Conclusions:

  • Electrostatic interactions from negatively charged silica substrates are significant in glass-supported membrane systems.
  • Substrate properties, specifically roughness and lipid physisorption, influence electrostatic screening.
  • Findings have implications for designing and interpreting experiments with supported lipid membranes.