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

Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

3.0K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
3.0K
Theory of Strong Electrolytes01:23

Theory of Strong Electrolytes

46
The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
46
The Colloidal State01:29

The Colloidal State

69
The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
69
Common Ion Effect03:24

Common Ion Effect

47.7K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
47.7K
Ion Exchange01:17

Ion Exchange

1.5K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
1.5K
Ionic Association01:28

Ionic Association

46
The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
46

You might also read

Related Articles

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

Sort by
Same author

Determining the Aethalometer multiple scattering enhancement factor C from the filter loading parameter.

The Science of the total environment·2024
Same author

Retraction Note: Osteolytic bone metastasis is hampered by impinging on the interplay among autophagy, anoikis and ossification.

Cell death & disease·2022
Same author

Ice adhesion of PDMS surfaces with balanced elastic and water-repellent properties.

Journal of colloid and interface science·2021
Same author

Wetting transitions on rough surfaces revealed with captive bubble experiments. The role of surface energy.

Journal of colloid and interface science·2019
Same author

Testing the performance of superhydrophobic aluminum surfaces.

Journal of colloid and interface science·2017
Same author

Circulating sRAGE in the diagnosis of osteolytic bone metastasis.

Journal of biological regulators and homeostatic agents·2017

Related Experiment Video

Updated: Mar 13, 2026

Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
09:02

Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization

Published on: July 9, 2015

12.9K

Specific Ion Effects and pH Dependence on the Interaction Forces between Polystyrene Particles.

F Javier Montes Ruiz-Cabello1, T Oncsik2, M A Rodríguez-Valverde1

  • 1Biocolloid and Fluid Physics Group, Applied Physics Department, Faculty of Sciences, University of Granada , Campus de Fuentenueva s/n, 18071 Granada, Spain.

Langmuir : the ACS Journal of Surfaces and Colloids
|October 26, 2016
PubMed
Summary

The pH and counterion type significantly influence forces between polystyrene colloids. Short-range repulsion at high pH is tunable and not solely due to hydrophobicity, impacting colloidal interactions.

More Related Videos

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

19.3K
Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
08:41

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions

Published on: September 7, 2018

9.5K

Related Experiment Videos

Last Updated: Mar 13, 2026

Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
09:02

Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization

Published on: July 9, 2015

12.9K
Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

19.3K
Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
08:41

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions

Published on: September 7, 2018

9.5K

Area of Science:

  • Colloid and Surface Science
  • Physical Chemistry
  • Materials Science

Background:

  • Colloidal interactions are crucial in numerous applications.
  • Electric double layer and van der Waals forces typically dominate at large separations.
  • Short-range forces, influenced by factors like pH and ion hydration, can significantly alter interaction profiles.

Purpose of the Study:

  • To investigate the impact of pH and counterion type on both long-range and short-range forces between polystyrene colloidal particles.
  • To examine the role of pH in modulating the wettability of polystyrene surfaces.
  • To understand the origin of short-range repulsive forces observed at varying pH levels.

Main Methods:

  • Utilized the colloidal probe technique with Atomic Force Microscopy (AFM) to measure forces between polystyrene particles.
  • Performed contact angle measurements on polystyrene sheets to assess surface wettability across a range of pH values.

Main Results:

  • Force profiles between polystyrene surfaces are demonstrably affected by solution pH and counterion hydration.
  • Polystyrene surfaces remain hydrophobic across the studied pH range, confirmed by contact angle measurements.
  • A pH-dependent short-range repulsion, mimicking hydrophilic behavior at high pH, was observed and linked to ion hydration, not hydrophobicity.

Conclusions:

  • Solution pH and counterion hydration are critical factors controlling short-range forces between polystyrene colloids.
  • The observed short-range repulsion at high pH is tunable with pH and ion hydration, suggesting a mechanism beyond simple surface hydrophobicity.
  • These findings offer insights into controlling colloidal interactions in various applications by manipulating solution chemistry.