Related Experiment Video
Updated: May 18, 2026
10:49
Surface Potential Measurement of Bacteria Using Kelvin Probe Force Microscopy
Published on: November 28, 2014
Applying the Kelvin probe to biological tissues: theoretical and computational analyses
Andrew C Ahn1, Brian J Gow, Orjan G Martinsen
1Martinos Center for Biomedical Imaging, Massachusetts General Hospital, 149 Thirteenth Street, Charlestown, Massachusetts 02129, USA. aahn1@partners.org
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 26, 2012
Summary
The Kelvin probe, a non-contact electrical potential measurement tool, can be effectively applied to biological tissues. This study establishes the theoretical framework, demonstrating its suitability for analyzing biomaterials like skin and cerebrospinal fluid.
Area of Science:
- Surface science
- Electrical engineering
- Biophysics
Background:
- The Kelvin probe non-invasively measures surface electrical potential using capacitive coupling.
- It excels in characterizing metals and semiconductors at microscale resolution.
- Its application to biological tissues is appealing but lacks a clear theoretical basis.
Purpose of the Study:
- To develop and evaluate the theoretical foundation for Kelvin probe measurements on dielectric and biological materials.
- To analyze the behavior of Kelvin probes with various material types, including biological tissues.
Main Methods:
- Developed theoretical equations for Kelvin probe measurements across five material models: highly conductive, conductive dielectric (rapid/slow relaxation), perfect dielectric, and biological tissue.
- Computationally analyzed these equations using parameters from theoretical and actual biomaterials (skin, cerebrospinal fluid, tendon).
Main Results:
- Kelvin probe performance depends on sample charge relaxation rates, classifying materials as perfect dielectrics or highly conductive.
- Biomaterials, due to rapid relaxation and high permittivity, function similarly to highly conductive materials like metals.
- Established that the Kelvin probe can be readily applied to biological tissue analysis.
Conclusions:
- The theoretical basis for applying Kelvin probes to biological tissues is now established.
- Biomaterials exhibit conductive properties under Kelvin probe analysis, enabling surface potential studies.
- This validates the Kelvin probe as a viable tool for investigating the electrical properties of biological tissues.
