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Dynamic Surface Tension Measurement with a Dynamic Wilhelmy Plate Technique

✍ Scribed by Ning Wu; Jialin Dai; Fortunato J Micale

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 157 KB
Volume: 215
Category: Article
ISSN: 0021-9797
DOI: 10.1006/jcis.1999.6270

No coin nor oath required. For personal study only.

✦ Synopsis

An experimental method called dynamic Wilhelmy plate technique (DWPT) for studying dynamic surface tension was designed in this study. A diffusion-controlled model corresponding to the initial and boundary conditions of this method was proposed. Dynamic surface tension of Triton X-100 and SDS was measured with this technique and analyzed with the proposed model. The calculated diffusion coefficients for the short-and long-time approximations are 3.7 ؋ 10 ؊6 and 0.97 ؋ 10 ؊6 cm 2 /s for Triton X-100 and 4.6 ؋ 10 ؊6 and 0.79 ؋ 10 ؊6 cm 2 /s for SDS, respectively. The predicted dynamic surface tension with these diffusion coefficients for the simultaneously generated aqueous/air interfaces is in good agreement with the drop mass technique. Another diffusion controlled model that considers the energy barrier at the aqueous/air interface was also proposed in this study. The calculated energy barriers are in the range of 4.1-5.7 RT for Triton X-100 and 6.5-8.0 RT for SDS.

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