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

Titration of Polyprotic Base with a Strong Acid01:18

Titration of Polyprotic Base with a Strong Acid

767
The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
767
Extraction: Effects of pH00:53

Extraction: Effects of pH

444
Consider a neutral form of an amine, B, with a partition coefficient, K, in a liquid mixture containing organic and aqueous phases. The pH of the aqueous phase affects the charge on acidic and basic solutes, and the charged form is usually more soluble in the aqueous phase. Suppose the conjugate acid form of the amine is soluble only in the aqueous phase while the base form is soluble in both phases. Then the distribution coefficient, D, can be given as the ratio of amine concentration in the...
444
Titration of Polyprotic Acids with a Strong Base01:23

Titration of Polyprotic Acids with a Strong Base

1.7K
Titration of a polyprotic acid, which contains multiple ionizable protons, involves distinct dissociation steps, each with its own dissociation constant (Ka). Each successive Ka is weaker than the previous one. In the titration of a polyprotic acid like sulfurous acid with a strong base such as sodium hydroxide, the base first neutralizes the initial ionizable proton, forming an intermediate species (e.g., hydrogen sulfite ions). This step's titration curve resembles that of a weak...
1.7K
Acid Halides to Carboxylic Acids: Hydrolysis01:01

Acid Halides to Carboxylic Acids: Hydrolysis

2.5K
Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...
2.5K
Acids, Bases and Neutralization Reactions03:26

Acids, Bases and Neutralization Reactions

54.4K
An acid-base reaction is one in which a hydrogen ion, H+, is transferred from one chemical species to another. Such reactions are of central importance to numerous natural and technological processes, ranging from the chemical transformations within cells or lakes and oceans to the industrial-scale production of fertilizers, pharmaceuticals, and other substances essential to the society.
54.4K
Titration of a Weak Acid with a Weak Base01:08

Titration of a Weak Acid with a Weak Base

2.7K
Weak acids and bases do not undergo dissociation completely, and titrations between these two are rarely studied. When such studies are performed, say, for the titration of a weak acid with a weak base, the titration curve plots the change in pH as a function of the volume of base added. Take the titration of acetic acid with ammonia, for instance. During the titration, these two species form ammonium acetate and water, but the pH change is slow and gradual.
As a result, there is no simple...
2.7K

You might also read

Related Articles

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

Sort by
Same author

Precipitation-Dissolution Switchable Surfactant-Based Microemulsions: Fabrication and Potential Applications in Remediating <i>p</i>-Nitrochlorobenzene-Contaminated Soil.

Langmuir : the ACS journal of surfaces and colloids·2025
Same author

pH Switchable Microemulsions: Minimize Salt Formation to Enhance the Reversibility of Switching.

Langmuir : the ACS journal of surfaces and colloids·2025
Same author

Fabrication and Enzymatic Disorganization of Multiresponse Worm-Like Micelles.

Langmuir : the ACS journal of surfaces and colloids·2023
Same author

A novel photothermal, self-healing and anti-reflection water evaporation membrane.

Soft matter·2021
Same author

Light-Trapping SERS Substrate with Regular Bioinspired Arrays for Detecting Trace Dyes.

ACS applied materials & interfaces·2021
Same author

Temperature-Switchable Surfactant-Free Microemulsion.

Langmuir : the ACS journal of surfaces and colloids·2020

Related Experiment Video

Updated: Jun 7, 2025

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
06:24

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

6.4K

pH-Switchable Surfactant-Based Microemulsions: Reversible Transition between Microemulsification and Demulsification

Bo Zhu1, Hui Chen1, Liwen Shi1,2

  • 1Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering, Jiangnan University, Wuxi 214122, P. R. China.

Langmuir : the ACS Journal of Surfaces and Colloids
|November 14, 2024
PubMed
Summary

This study introduces the first pH-switchable surfactant-based microemulsion (SBME) using SDS-C12A, enabling reversible phase transitions for applications like recyclable reaction media.

More Related Videos

Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process
12:00

Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process

Published on: March 21, 2014

11.8K
Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
10:11

Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer

Published on: April 19, 2021

3.6K

Related Experiment Videos

Last Updated: Jun 7, 2025

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
06:24

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

6.4K
Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process
12:00

Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process

Published on: March 21, 2014

11.8K
Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
10:11

Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer

Published on: April 19, 2021

3.6K

Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry

Background:

  • pH-switchable surfactant-based microemulsions (SBMEs) offer reversible phase transitions, a rarely reported phenomenon.
  • Controlling microemulsion stability via pH is crucial for advanced material applications.

Purpose of the Study:

  • To fabricate and characterize the first pH-switchable SDS-C12A-based microemulsion (SDS-C12A-ME).
  • To investigate the mechanism of reversible switching and the impact of byproducts.
  • To demonstrate the potential of SDS-C12A-ME as a recyclable reaction medium.

Main Methods:

  • Fabrication of SDS-C12A-ME using an equimolar mixture of sodium dodecyl sulfate and N,N-dimethyldodecylamine.
  • Investigation of reversible switching triggered by alternating acids and bases.
  • Assessment of byproduct effects (H2O and salt) on reversibility.
  • Demonstration using methyl methacrylate photochemical polymerization as a model system.

Main Results:

  • Successfully fabricated the first pH-switchable SDS-C12A-ME.
  • Reversible switching relies on the protonation/deprotonation of C12A, affecting the emulsifier film.
  • Salt byproducts significantly reduce reversibility; choline hydroxide enhances switching cycles compared to sodium hydroxide.
  • The SDS-C12A-ME served as a recyclable reaction medium for polymerization, yielding poly(methyl methacrylate) with reproducible molecular weight and narrow polydispersity (PDI ≈ 1.2).

Conclusions:

  • The developed SDS-C12A-ME exhibits efficient pH-switchable behavior.
  • Optimized acid-base stimuli (e.g., HCl-ChOH) enhance reversibility and cycling stability.
  • pH-switchable microemulsions are promising recyclable media for polymerization and potentially other applications like drug delivery and microreactors.