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Related Experiment Videos

A remote query magnetoelastic pH sensor.

Q Y Cai1, C A Grimes

  • 1Department of Electrical Engineering, Center for Micro-Magnetic and Electronic Devices, University of Kentucky, Lexington, KY 40506, USA.

Sensors and Actuators. B, Chemical
|August 24, 2002
PubMed
Summary
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This study introduces a novel magnetoelastic pH sensor. The sensor uses a polymer coating whose mass changes with pH, altering its vibration frequency for remote detection.

Area of Science:

  • Materials Science
  • Chemical Sensors
  • Nanotechnology

Background:

  • Magnetoelastic sensors offer remote detection capabilities.
  • pH monitoring is crucial in various scientific and industrial applications.
  • Developing non-invasive, remote pH sensing technologies is an ongoing challenge.

Purpose of the Study:

  • To describe a novel magnetoelastic sensor for remote pH measurement.
  • To characterize the performance of a pH-responsive polymer coating on a magnetoelastic film.
  • To evaluate the sensor's sensitivity and response to environmental factors.

Main Methods:

  • Fabrication of a magnetoelastic thick-film sensor coated with a pH-responsive polymer.
  • Synthesis of a copolymer from acrylic acid and iso-octyl acrylate.
Keywords:
NASA Discipline Environmental HealthNon-NASA Center

Related Experiment Videos

  • Dip-coating deposition of the polymer onto a Metglas alloy 2826MB magnetoelastic film.
  • Remote detection of sensor vibration frequency using a pickup coil in response to a magnetic query field.

    • Main Results:

    • The sensor demonstrated a linear frequency change between pH 5 and 9.
    • Sensitivity was measured at approximately 285 Hz/pH or 0.6%/pH for a 1 micrometer polymer coating.
    • The presence of 10 mmol/l KCl reduced the polymer's sensitivity by approximately 4%.

    Conclusions:

    • A magnetoelastic thick-film sensor coated with a pH-responsive polymer enables remote pH monitoring.
    • The sensor exhibits a quantifiable and linear response to pH changes within a specific range.
    • The sensor's performance can be influenced by ionic strength, indicating potential for specific environmental adaptations.