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Measurement and correlation of surface tension for single aqueous electrolyte solutions

Sadeghi, M ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1007/s10765-010-0725-9
  3. Publisher: 2010
  4. Abstract:
  5. In this study, the values of the surface tension for a number of single aqueous electrolyte solutions were measured at various temperatures and electrolyte concentrations using the well-known and computer-aided pendant-drop method. In order to conduct the experimental measurements, a high-pressure IFT-700 apparatus, equipped with a view cell and a data acquisition system, was used. The systems studied in this study were aqueous solutions of KCl, NaCl, CaCl 2, and Na 2SO 4. The pooled standard deviation and the confidence limit of the surface-tension data for a 95 % confidence level were determined to be 0.17mN · m -1 and σ̄ ± 0.19, respectively. It should be noted that while the surface tension for electrolyte solutions increases as the electrolyte concentration increases, it decreases with an increase in temperature as expected. Finally, data reduction was carried out using an empirical equation to show the effect of temperature, electrolyte concentration, and the nature of ionic species on the surface tension for the systems studied
  6. Keywords:
  7. Aqueous electrolyte solutions ; Aqueous solutions ; Confidence levels ; Confidence limit ; Data acquisition system ; Effect of temperature ; Electrolyte concentration ; Electrolyte solutions ; Empirical equations ; Experimental measurements ; IFT apparatus ; Ionic species ; Pendant-drop method ; Standard deviation ; Calcium chloride ; Data reduction ; Sodium ; Sodium chloride ; Solutions ; Surface properties ; Surface tension ; Electrolytes
  8. Source: International Journal of Thermophysics ; Volume 31, Issue 4-5 , May , 2010 , Pages 852-859 ; 0195928X (ISSN)
  9. URL: http://link.springer.com/article/10.1007/s10765-010-0725-9