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

Colloidal precipitates01:09

Colloidal precipitates

6.5K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
6.5K
Coagulation01:06

Coagulation

1.5K
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
1.5K
Colloids03:22

Colloids

21.4K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
21.4K

You might also read

Related Articles

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

Sort by
Same author

Microfluidics and nanofluidics in India - some recent advancements and futuristic perspective.

Biomicrofluidics·2025
Same author

Trapping, coalescence, and splitting of drops in an ultrasound-actuated microcavity.

Soft matter·2025
Same author

Ultrasound reforms droplets.

Lab on a chip·2024
Same author

Coflowing <i>aqueous</i> and oil-based ferrofluid streams exposed to a magnetic field.

Soft matter·2024
Same author

Understanding the Role of Loss Modulus of Viscoelastic Substrates in the Evaporation Dynamics of Sessile Drops.

Langmuir : the ACS journal of surfaces and colloids·2024
Same author

Dynamics of a two-layer immiscible fluid system exposed to ultrasound.

The Journal of the Acoustical Society of America·2024

Related Experiment Video

Updated: Feb 17, 2026

Glass-Based Devices to Generate Drops and Emulsions
08:45

Glass-Based Devices to Generate Drops and Emulsions

Published on: April 5, 2022

3.2K

Droplet Demulsification Using Ultralow Voltage-Based Electrocoalescence.

A Srivastava1, S Karthick1, K S Jayaprakash1

  • 1Department of Mechanical Engineering, Indian Institute of Technology Madras , Chennai 600036, India.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 14, 2017
PubMed
Summary

Ultralow voltage electrocoalescence enables efficient demulsification of surfactant-stabilized aqueous droplets. This new method overcomes disjoining pressure at significantly lower voltages, paving the way for advanced extraction techniques.

More Related Videos

Synthesis of Phase-shift Nanoemulsions with Narrow Size Distributions for Acoustic Droplet Vaporization and Bubble-enhanced Ultrasound-mediated Ablation
08:28

Synthesis of Phase-shift Nanoemulsions with Narrow Size Distributions for Acoustic Droplet Vaporization and Bubble-enhanced Ultrasound-mediated Ablation

Published on: September 13, 2012

11.6K
Particle Templated Emulsification enables Microfluidic-Free Droplet Assays
11:03

Particle Templated Emulsification enables Microfluidic-Free Droplet Assays

Published on: March 9, 2021

6.8K

Related Experiment Videos

Last Updated: Feb 17, 2026

Glass-Based Devices to Generate Drops and Emulsions
08:45

Glass-Based Devices to Generate Drops and Emulsions

Published on: April 5, 2022

3.2K
Synthesis of Phase-shift Nanoemulsions with Narrow Size Distributions for Acoustic Droplet Vaporization and Bubble-enhanced Ultrasound-mediated Ablation
08:28

Synthesis of Phase-shift Nanoemulsions with Narrow Size Distributions for Acoustic Droplet Vaporization and Bubble-enhanced Ultrasound-mediated Ablation

Published on: September 13, 2012

11.6K
Particle Templated Emulsification enables Microfluidic-Free Droplet Assays
11:03

Particle Templated Emulsification enables Microfluidic-Free Droplet Assays

Published on: March 9, 2021

6.8K

Area of Science:

  • Colloid and Surface Science
  • Electrochemistry
  • Microfluidics

Background:

  • Demulsification of surfactant-stabilized droplets is challenging due to low surface energy and repulsive forces like disjoining pressure.
  • Existing methods often require high voltages, limiting their applicability and increasing energy consumption.

Purpose of the Study:

  • To investigate an ultralow voltage-based electrocoalescence phenomenon for demulsifying aqueous droplets.
  • To explore the underlying mechanism where electrical stress overcomes disjoining pressure.
  • To demonstrate applications in microparticle extraction and selective demulsification.

Main Methods:

  • Applying ultralow voltages (10-90 V) to induce electrocoalescence between aqueous droplets and an aqueous stream.
  • Studying the influence of surfactant concentration, droplet diameter, and velocity on the electrocoalescence process.
  • Utilizing macroscopic contact for enhanced droplet coalescence.

Main Results:

  • Achieved droplet coalescence at significantly lower voltages (10-90 V) compared to conventional methods (1.0-3.0 kV).
  • Demonstrated that electrical stress can overcome the disjoining pressure at a critical electric field.
  • Successfully applied the technique for extracting microparticles and for size-based selective demulsification.

Conclusions:

  • Ultralow voltage electrocoalescence presents a novel and energy-efficient approach for demulsification.
  • This technique offers a new paradigm for droplet coalescence and content extraction with broad applications in chemistry and biology.