Zeta Potential of Air Bubbles in Surfactant Solutions

✍ Scribed by P. Saulnier; J. Lachaise; G. Morel; A. Graciaa

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 112 KB
• Volume: 182
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1996.0479

✦ Synopsis

EXPERIMENTAL PROTOCOL

A spinning tube electrophorometer was used to measure the z potential of air bubbles immersed in surfactant solutions. It was

The spinning tube electrophorometer used is described in found that a suitable polymer coated on the inner surface of the a previous paper (1). It consists essentially of a spinning tube prevents electroosmosis at pH values between 5 and 8, when capillary tube, each end of which is connected to a compartanionic or nonionic surfactants are used. Generally speaking, zment containing a platinum electrode. The inner surface potential variations principally reflect the kinetics and the saturacharge of the tube is neutralized by coating a thin layer tion of the adsorption of surfactant molecules on the bubbles.

of diethylaminoethyl-dextran (DEAED), which is further Surfactant adsorption and counterion adsorption appear simultacrosslinked through reaction with 1,4-butanediglycidyl ether neously, and as the former is substantially higher than the latter,

(2). That is done to prevent electroosmosis.

it is not possible to distinguish each contribution. For a very pure nonionic surfactant and bubbles immersed in a solution with a One compartment and the tube are filled with the surfacvery low counterion content, however, these contributions are suftant solution; the opposite compartment is kept empty by ficiently dissociated to produce a minimum z potential as a funcmeans of a septum. A precision syringe is used to introduce tion of surfactant concentration.