Determination of Surface Charge Density Constants for Spherical Silica Particles Using a Linear Transformation

✍ Scribed by Jürgen Sonnefeld

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 118 KB
• Volume: 183
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1996.0583

✦ Synopsis

NOTE

Determination of Surface Charge Density Constants for Spherical Silica Particles Using a Linear Transformation (the braces indicate surface concentration, the square brackets indicate volume concentration). U 0 is related to the electrical potential, c 0 , at the The surface charge density, s, on spherical silica particles was surface through measured in 0.05, 0.01, and 0.005 M aqueous KCl solutions by potentiometric titration. Two different methods for a linear transformation to evaluate the parameters describing the s-pH plots U 0 Å c 0 F A /(RT ), [3] including a surface potential for spherical particles were applied; each one has advantages and shortcomings. The equations derived where F A Å Faraday constant, R Å gas constant, T Å temperature, and s by C. P. Huang and W. Stumm [ J. Colloid Interface Sci. 43, 409 is given by (1972)] give a higher correlation coefficient for the linear plot. An excellent agreement between the recalculated s-pH plots and the

experimental data is found on application of the method of J. S.