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Measurement and Interpretation of Electrokinetic Phenomena (IUPAC Technical Report)

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Chemistry International -- Newsmagazine for IUPAC
From the journal Chemistry International -- Newsmagazine for IUPAC Volume 28 Issue 1

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Measurement and Interpretation of Electrokinetic Phenomena (IUPAC Technical Report)

A.V. Delgado, F. González-Caballero, R.J. Hunter, L.K. Koopal, and J. Lyklema

Pure and Applied Chemistry

Vol. 77, No. 10, pp. 1753–1805 (2005)

Electrokinetic phenomena (EKP) can be loosely defined as all those phenomena involving tangential fluid motion adjacent to a charged surface. They are manifestations of the electrical properties of interfaces under steady-state and isothermal conditions. In practice, they are often the only source of information available on those properties. For this reason, their study constitutes one of the classical branches of colloid science, electrokinetics, which has been developed in close connection with the theories of the electrical double layer (EDL) and of electrostatic surface forces.

In this report, the status quo and recent progress in electrokinetics are reviewed. Practical rules are recommended for performing electrokinetic measurements and interpreting their results in terms of well-defined quantities, the most familiar being the ζ-potential or electrokinetic potential. This potential is a property of charged interfaces, and it should be independent of the technique used for its determination. However, often the ζ-potential is not the only property electrokinetically characterizing the electrical state of the interfacial region; the excess conductivity of the stagnant layer is an additional parameter. The requirement to obtain the ζ-potential is that electrokinetic theories be correctly used and applied within their range of validity.

Also in this report, basic theories and their application ranges are discussed and a thorough description of the main electrokinetic methods is given, with special attention paid to their ranges of applicability as well as to the validity of the underlying theoretical models. Electrokinetic consistency tests are proposed in order to assess the validity of the ζ-potentials obtained. The recommendations given in the report apply mainly to smooth and homogeneous solid particles and plugs in aqueous systems; some attention is paid to nonaqueous media and less ideal surfaces.

www.iupac.org/publications/pac/2005/7710/7710x1753.html

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Published Online: 2009-09-01
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https://doi.org/10.1515/ci.2006.28.1.29b

Articles in the same Issue

  1. Contents
  2. IUPAC–An Optimistic Future
  3. “Inner Chemical Life” of Solids
  4. Does It Have a Sporting Chance?
  5. The Quest for a Universal Format
  6. IUPAC in BEIJING–Division Roundups Part II
  7. Chemistry Enrollment in Germany: Bucking the Trend
  8. A First-Class Event for First-Class Young Chemists–37th International Chemistry Olympiad 2005
  9. Essential to You
  10. Two New CAs Join IUPAC
  11. Strengthening International Science–A Recurring Catchphrase from ICSU
  12. Developments and Applications in Solubility
  13. Glossary of Terms Related to Solubility
  14. e-Quiz for Promoting Chemical Education
  15. Solubility Data Series: Transition and 12 to 14 Main Group Metals, Lanthanide, Actinide, and Ammonium Halates
  16. Flying Chemists Program–A Visit to India
  17. Global Climate Change–Translation and Dissemination of a Monograph for Secondary Schools
  18. Distance Learning in Toxicology: Effective Teaching through Technology
  19. IUPAC Stability Constants Database–Completion of Data Collection up to 2006
  20. JCAMP-DX for Electron Magnetic Resonance
  21. XML-Based IUPAC Standard for Experimental, Predicted, and Critically Evaluated Thermodynamic Property Data Storage and Capture (ThermoML)
  22. Quantities, Units and Symbols in Physical Chemistry, Third Edition
  23. Glossary of Terms Used in Photochemistry
  24. Postgenomic Chemistry (IUPAC Technical Report)
  25. Measurement and Interpretation of Electrokinetic Phenomena (IUPAC Technical Report)
  26. Evaluated Kinetic Data for Combustion Modeling: Supplement II
  27. Biological and Synthetic Polymer Networks and Gels
  28. Innovation in Chemistry
  29. Solution Chemistry
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