English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Surfactant adsorption kinetics in microfluidics.

Riechers, B., Maes, F., Akoury, E., Semin, B., Gruner, P., & Baret, J.-C. (2016). Surfactant adsorption kinetics in microfluidics. Proceedings of the National Academy of Sciences of the United States of America, 113(41), 11465-11470. doi:10.1073/pnas.1604307113.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-9767-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-3AAB-5
Genre: Journal Article

Files

show Files

Locators

show
hide
Locator:
http://www.pnas.org/content/113/41/11465.full (Publisher version)
Description:
-

Creators

show
hide
 Creators:
Riechers, Birte1, Author              
Maes, Florine1, Author              
Akoury, E., Author
Semin, Benoît1, Author              
Gruner, Philipp1, Author              
Baret, Jean-Christophe1, Author              
Affiliations:
1Max Planck Research Group Droplets, Membranes and Interfaces, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063290              

Content

show
hide
Free keywords: Droplet; Interfaces; Surfactant; Emulsion; Microfluidics
 Abstract: Emulsions are metastable dispersions. Their lifetimes are directly related to the dynamics of surfactants. We design a microfluidic method to measure the kinetics of adsorption of surfactants to the droplet interface, a key process involved in foaming, emulsification, and droplet coarsening. The method is based on the pH decay in the droplet as a direct measurement of the adsorption of a carboxylic acid surfactant to the interface. From the kinetic measurement of the bulk equilibration of the pH, we fully determine the adsorption process of the surfactant. The small droplet size and the convection during the droplet flow ensure that the transport of surfactant through the bulk is not limiting the kinetics of adsorption. To validate our measurements, we show that the adsorption process determines the timescale required to stabilize droplets against coalescence, and we show that the interface should be covered at more than [Formula: see text] to prevent coalescence. We therefore quantitatively link the process of adsorption/desorption, the stabilization of emulsions, and the kinetics of solute partitioning-here through ion exchange-unraveling the timescales governing these processes. Our method can be further generalized to other surfactants, including nonionic surfactants, by making use of fluorophore-surfactant interactions.

Details

show
hide
Language(s): eng - English
 Dates: 2016-09-29
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1073/pnas.1604307113
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Proceedings of the National Academy of Sciences of the United States of America
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 113 (41) Sequence Number: - Start / End Page: 11465 - 11470 Identifier: -