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New Developments 1/5/18

A new generation of bubble pressure tensiometers, including BPA-2P and BPA-2S , as follow up developments of the excellent predecessors BPA-1P and BPA-1S , are available more...


New Books 1/5/18

Textbook “Dispersionseigenschaften - Stabilität, 2D-Rheologie, 3D-Rheologie“ This textbook contains the main fundamental knowledge on interfaces, colloidal systems more...


Latest events 1/5/18

2D-3D Rheology and Stability of Disperse Systems - User Workshop, May 14-16, 2018, Potsdam, Germany In May 2018 the 2D-3D Rheology and Stability of Disperse Systems more...

Oscillating Drop and Bubble Analyser ODBA1M


ODBA-instr odba-drop 

This instrument is designed as an additional module for the PAT1, PAT1M and PAT2S, using the temperature control chamber, optical bench, light source and video image acquisition for the alighnment, focusing and determination of the drop size. If drops have a spherical shape (very small and/or low density), the measurement of the pressure P together with the radius of curvature r yields the interfacial tension y.

For measurements of interfacial tensions between a liquid and a fluid, the density difference is needed. Calibration against the external and hydrostatic pressure is needed as well.

For drop/bubble oscillation experiments only pressure changes have to be measured along with the phase shift to the generated area oscillation.

Features of the instrument
drop oscillation at frequencies from 1 to 100 Hz to determine the dilational elasticity and viscosity of interfacial layers
applicable to bubbles and drops (also immersed in a second liquid)
easy temperature control
measurement of interfacial tension between two liquids of same density (see also DPA-1)
dynamic interfacial tensions for adsorption times between 50 ms and hours


Reference List

Reference list for Capillary Pressure Tensiometer DPA1 and ODBA1

E.K. Zholkovskij, V.I. Kovalchuk, V.B. Fainerman, G. Loglio, J. Krägel, R. Miller, S.A. Zholob and S.S. Dukhin, Resonance behaviour of oscillating bubbles, J. Colloid Interface Sci., 224(2000)47-55

R. Miller, V.B. Fainerman and V.I. Kovalchuk, Bubble and Drop Pressure Tensiometry, in “Encyclopaedia of Surface and Colloid Science”, A. Hubbard (Ed.), Marcel Dekker, New York, 2002, 814-828, ISBN 0-8247-0633-1

V.I. Kovalchuk, E.K. Zholkovskij, J. Krägel, R. Miller, V.B. Fainerman, R. Wüstneck, G. Loglio and S.S. Dukhin, Bubble oscillations in a closed cell, J. Colloid Interface Sci. 224(2000)245 – 254

V.I. Kovalchuk, J. Krägel, R. Miller, V.B. Fainerman, N.M. Kovalchuk, E.K. Zholkovskij, R. Wüstneck, and S.S. Dukhin, Effect of the non-stationary viscous flow in the capillary on oscillating bubble and oscillating drop measurements, J. Colloid Interface Sci., 232(2000) 25- 32

R. Miller, V.B. Fainerman and V.I. Kovalchuk, Bubble and Drop Pressure Tensiometry, in “Encyclopaedia of Surface and Colloid Science”, A. Hubbard (Ed.), Marcel Dekker, New York, 2002, 814-828, ISBN 0-8247-0633-1

V.I. Kovalchuk, J. Krägel, A.V. Makievski, G. Loglio, F. Ravera, L. Liggieri and R. Miller, Frequency characteristics of amplitude and phase of oscillating bubble systems in a closed measuring cell, J. Colloid Interface Sci.,  252 (2002) 433-442