Search research articles

Search research articles

Related Experiment Videos

A pH sensor based on force generated by pH-dependent polymer swelling.

Lee Zhang¹, W Rudolf Seitz

¹Department of Chemistry, University of New Hampshire, Durham, NH 03824, USA.

Analytical and Bioanalytical Chemistry

|August 20, 2002

Summary

This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

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

Sort by

Same author

Thermodynamic and Kinetic Characterization of Colloidal Polymers of <i>N</i>-Isopropylacrylamide and Alkyl Acrylic Acids for Optical pH Sensing.

Molecules (Basel, Switzerland)·2025

Same author

Silica covered stannic oxide nanoparticles-an easily prepared robust substrate for optical sensors.

Nanotechnology·2021

Same author

Molecular Recognition: Perspective and a New Approach.

Sensors (Basel, Switzerland)·2021

Same author

Stimuli-Responsive Templated Polymer as a Target Receptor for a Conformation-based Electrochemical Sensing Platform.

ACS applied polymer materials·2021

Same author

A Single-chain Templated Polymer-based Target Receptor as a New Platform for Label-free Selective Electrochemical Sensing.

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference·2020

Same author

A Cu(II) Indicator Platform Based on Cu(II) Induced Swelling that Changes the Extent of Fluorescein Self-Quenching.

Polymers·2019

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

A novel pH sensor utilizes a polymer bead that swells in response to hydrogen ion concentration, changing strain gauge resistance. This feasible sensor technology offers potential for stable, long-lived applications in chemical sensing.

Area of Science:

Polymer Science
Chemical Sensing
Materials Science

Background:

Development of accurate and reliable pH sensors is crucial for various scientific and industrial applications.
Existing pH sensing technologies often face limitations in stability, longevity, or complexity.
A need exists for innovative sensor designs that are both effective and instrumentally simple.

Purpose of the Study:

To demonstrate the feasibility of a new pH sensor based on a polymer bead and a strain gauge.
To investigate the mechanism of pH-induced swelling in a derivatized polymer bead.
To evaluate the performance characteristics of the developed sensor system.

Main Methods:

Fabrication of a pH-sensitive polymer bead from crosslinked diethanolamine derivatized poly(vinylbenzyl chloride), toughened with Kraton G1652.

Related Experiment Videos

Integration of the polymer bead with a strain gauge (pressure-sensitive resistor) to detect swelling-induced pressure changes.

Utilizing a Wheatstone bridge to readout changes in strain gauge resistance corresponding to pH variations.

Characterization of sensor response time, dependence on bead radius, and correlation with mechanical properties (penetration modulus).

Main Results:

The sensor demonstrated feasibility, detecting pH changes via alterations in strain gauge resistance.
An increase in hydrogen ion concentration led to polymer swelling due to electrostatic forces.
A response time of 390 seconds was observed for a 0.25 mm bead when pH shifted from 10 to 4.
Sensor response correlated with bead radius squared and penetration modulus, indicating sensitivity to mechanical deformation.

Conclusions:

The developed polymer bead-strain gauge system presents a feasible approach for pH sensing.
The sensor's performance is influenced by the polymer's mechanical properties and bead dimensions.
Further research is needed to ensure the long-term stability of the polymer bead through repeated swelling/shrinking cycles for practical applications.