Comparison of colloidal effective charges from different experiments

Wette, Patrick; Scho¨pe, Hans Joachim; Palberg, Thomas
June 2002
Journal of Chemical Physics;6/22/2002, Vol. 116 Issue 24, p10981
Academic Journal
We present measurements of effective charges in de-ionized aqueous suspensions of highly charged spherical latex colloids. For crystalline ordered samples the shear modulus G was measured using torsional resonance spectroscopy. It increases with increasing particle number density n. From fits of theoretical expressions based on a Debye-Hückel-type pair interaction potential, an effective charge Z[sup *][sub G] was derived. On the other hand the effectively transported charge Z[sup *][sub σ] was determined from the n dependence of the suspension conductivity. Both effective charges are independent of n within experimental error. For most species they scale with the ratio of radius to Bjerrum length. For all species, however, Z[sup *][sub σ] is found to be systematically larger than Z[sup *][sub G] by some 40%.


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