An experimental method called dynamic Wilhelmyplate technique (DWPT) for studying dynamic surfacetension was designed in this study. A diffusion-controlled model corresponding to the initial and boundary conditions of this method was proposed. Dynamic surfacetension 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 cm2/s for Triton X-100 and 4.6 × 10−6 and 0.79 × 10−6 cm2/s for SDS, respectively. The predicted dynamic surfacetension 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.
Hot keywords of USA KINO:contact angle, contact angle measurement, contact angle meter, contact angle goniometer, surface tensiometer, interfacial tensiometer, surface tension measurement, surface tension, surface tensiometry, contact angle measurement equipment and device, calculating surfac free energy, Determining Critical Micelle Concentration (CMC) of surfactant, made in China Method for choosing surface tensiometer NEW Method for choosing contact angle meter (goniometer) NEW Method for choosing interfacial tension meter NEW
MainPro : contact angle,contact angle meter,contact angle goniometer,surface tension,surface tensiometer