caa a22 4500 475764072 CHVBK 20180406123559.0 cr unu---uuuuu 170329e20001201xx s 000 0 eng 10.1007/s003960000379 doi (NATIONALLICENCE)springer-10.1007/s003960000379 An absolute droplet pressure interfacial tensiometer and its application to bituminous systems of vanishing density contrast [Elektronische Daten] [E. N. Stasiuk, L. L. Schramm] Experimental problems preclude or limit measurements of interfacial tension in bitumen or extra-heavy crude oil-containing systems when there exists a vanishing density difference between the phases. We describe a novel droplet pressure method that allows such measurements to be made. This method is based on a liquid/liquid adaptation of the capillary displacement differential maximum bubble pressure surface tension method of Schramm and Green [29]. In this method, interfacial tension is calculated from the difference between maximum droplet pressures reached at capillaries of differing internal radii, immersed to slightly different depths. The elimination of the influence of liquid densities allows the measurement of interfacial tensions without independently determining the liquid densities, and in particular, permits measurements in systems for which the density difference is vanishingly small. The absolute measuring technique is illustrated for several systems of pure and practical liquids. Springer-Verlag Berlin Heidelberg, 2000 Key words Interfacial tensiometer nationallicence Bituminous systems nationallicence Vanishing density contrast nationallicence Droplet pressure nationallicence Stasiuk E. N. Petroleum Recovery Institute and Chemistry Department University of Calgary Alberta, Canada, CA aut Schramm L. L. Chemistry Department, University of Calgary and Petroleum Recovery Institute Alberta Research Council 450 Karl Clark Road, Edmonton Alberta, Canada, T6N 1E4 e-mail: schramm@arc.ab.ca, CA aut https://doi.org/10.1007/s003960000379 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960000379 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Stasiuk E. N. Petroleum Recovery Institute and Chemistry Department University of Calgary Alberta, Canada, CA aut NATIONALLICENCE 700 1- Schramm L. L. Chemistry Department, University of Calgary and Petroleum Recovery Institute Alberta Research Council 450 Karl Clark Road, Edmonton Alberta, Canada, T6N 1E4 e-mail: schramm@arc.ab.ca, CA aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer