Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

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...
SDS-PAGE01:27

SDS-PAGE

Gel electrophoresis is a method that separates biological macromolecules like nucleic acids or proteins by forcing them to pass through a gel matrix under an electric field.
A variation of gel electrophoresis, termed  polyacrylamide gel electrophoresis (PAGE), is commonly used for separating proteins according to their molecular size by passing them through a polyacrylamide gel. Because of the varying charges associated with amino acid side chains, PAGE can be used to separate intact proteins...
Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

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,...
Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the concentration...
Solubility03:00

Solubility

Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...
Surface Active Agents01:27

Surface Active Agents

Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Amphiphilic Baskets for Supramolecular Nanoarchitectures at Interfaces: Inverted Monolayer Formation on Water.

Langmuir : the ACS journal of surfaces and colloids·2026
Same author

IR Spectroscopy and Linear Support Vector Machine Analysis of Colorectal Liver Metastasis.

The journal of physical chemistry. B·2026
Same author

Linear Support Vector Machine Model of an IR Spectral Library: Application to Skin Cancer.

ACS omega·2026
Same author

Reorganization of Water at Aqueous Aluminum Chloride (AlCl<sub>3</sub>) Interfaces: Vibrational Sum Frequency Generation and Molecular Dynamics Simulations.

The journal of physical chemistry. A·2025
Same author

Developing transferable and universal IR biomarkers for intraoperative colorectal cancer diagnosis via FTIR spectroscopy.

Scientific reports·2025
Same author

Nanoplastic-Induced Disruption of DPPC and Palmitic Acid Films: Implications for Membrane Integrity.

Environmental science & technology·2025

Related Experiment Video

Updated: Jul 13, 2026

Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
07:18

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

Published on: June 14, 2019

Competition between DPPC and SDS at the air-aqueous interface.

Kandice L Harper1, Heather C Allen

  • 1Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 17, 2007
PubMed
Summary

Interactions between sodium dodecyl sulfate (SDS) and DPPC monolayers at air-aqueous interfaces were studied. SDS and DPPC compete for surface sites, altering molecular ordering and water alignment.

More Related Videos

Self-Assembly of Hybrid Lipid Membranes Doped with Hydrophobic Organic Molecules at the Water/Air Interface
06:28

Self-Assembly of Hybrid Lipid Membranes Doped with Hydrophobic Organic Molecules at the Water/Air Interface

Published on: May 1, 2020

Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
06:31

Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device

Published on: March 18, 2020

Related Experiment Videos

Last Updated: Jul 13, 2026

Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
07:18

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

Published on: June 14, 2019

Self-Assembly of Hybrid Lipid Membranes Doped with Hydrophobic Organic Molecules at the Water/Air Interface
06:28

Self-Assembly of Hybrid Lipid Membranes Doped with Hydrophobic Organic Molecules at the Water/Air Interface

Published on: May 1, 2020

Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
06:31

Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device

Published on: March 18, 2020

Area of Science:

  • Surface Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • The air-aqueous interface is crucial for biological and industrial processes.
  • Understanding surfactant-lipid interactions is key to controlling interfacial properties.

Purpose of the Study:

  • To investigate the competitive interactions between sodium dodecyl sulfate (SDS) and 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) at the air-aqueous interface.
  • To elucidate the effects of these interactions on molecular ordering and interfacial water structure.

Main Methods:

  • Vibrational sum frequency generation (VSFG) spectroscopy was employed.
  • VSFG spectroscopy was used to probe molecular structure and orientation at the interface.

Main Results:

  • SDS and DPPC compete for surface sites, reducing the surface density of both molecules.
  • Increased conformational ordering of DPPC acyl chains and SDS dodecyl chains was observed.
  • SDS promoted alignment of interfacial water molecules, even with a DPPC monolayer present.

Conclusions:

  • The presence of DPPC affects SDS adsorption and ordering at the interface.
  • The presence of SDS influences DPPC packing and interfacial water structure.
  • VSFG spectroscopy provides detailed insights into complex interfacial systems.