Critical Assessment of the Surface Tension Determined by the Maximum Pressure Bubble Method

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Benedetto, Franco ; Zolotucho, Hector Antonio ; Prado, Miguel Oscar (2015)
  • Publisher: Associação Brasileira de Metalurgia e Materiais; Associação Brasileira de Cerâmica; Associação Brasileira de Polímeros ABPol
  • Related identifiers: doi: 10.1590/1516-1439.232513
  • Subject: Ciencias Químicas | Físico-Química, Ciencia de los Polímeros, Electroquímica | MAXIMUM PRESSURE BUBBLE METHOD | SURFACE TENSION | MPBM | BUBBLE DEFORMATION | CIENCIAS NATURALES Y EXACTAS

The main factors that influence the value of surface tension of a liquid measured with the Maximum Pressure Bubble Method are critically evaluated. We present experimental results showing the effect of capillary diameter, capillary depth, bubble spheroidicity and liquid density at room temperature. We show that the decrease of bubble spheroidicity due to increase of capillary immersion depth is not sufficient to explain the deviations found in the measured surface tension values. Thus, we propose a simple experimental procedure that allows determining the surface tension of a liquid without any previous knowledge of its density. This procedure is especially useful when the liquid of interest exhibits variations of surface tension and density with time, as for example during condensation reactions to obtain SiO2 sols from a tetraethyl ortosilicate (TEOS) solutions during their aging process. Fil: Benedetto, Franco . Comision Nacional de Energia Atomica. Gerencia de Area de Aplicaciones de la Tecnologia Nuclear. Gerencia de Investigacion Aplicada. Grupo de Materiales Nucleares; Argentina Fil: Zolotucho, Hector Antonio. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Prado, Miguel Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comision Nacional de Energia Atomica. Gerencia de Area de Aplicaciones de la Tecnologia Nuclear. Gerencia de Investigacion Aplicada. Grupo de Materiales Nucleares; Argentina. Universidad Nacional de Cuyo; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Area de Energía Nuclear. Instituto Balseiro; Argentina