scholarly journals Direct Determination of the Distribution Coefficient of Tridecyl Dimethyl Phosphine Oxide between Water and Hexane

2018 ◽  
Vol 2 (3) ◽  
pp. 28 ◽  
Author(s):  
Valentin Fainerman ◽  
Altynay Sharipova ◽  
Saule Aidarova ◽  
Volodymyr Kovalchuk ◽  
Eugene Aksenenko ◽  
...  
Keyword(s):  
Interfacial Tension ◽  
Distribution Coefficient ◽  
Phosphine Oxide ◽  
Profile Analysis ◽  
Water Drop ◽  
Direct Determination ◽  
Interfacial Tensions ◽  
Drop Profile Analysis Tensiometry ◽  
Hexane Solution

Drop profile analysis tensiometry is applied to determine the distribution coefficient of a nonionic surfactant for a water/hexane system. The basic idea is to measure the interfacial tension isotherm in two configurations: a hexane drop immersed in the surfactant aqueous solutions at different bulk concentrations, and a water drop immersed into a hexane solution of the same surfactant. Both types of experiments lead to an isotherm for the equilibrium interfacial tensions with the same slope but with a concentration shift between them. This shift refers exactly to the value of the distribution coefficient.

scholarly journals Interfacial Tension Sensor for Low Dosage Surfactant Detection

2021 ◽  
Vol 5 (1) ◽  
pp. 9
Author(s):  
Piotr Pawliszak ◽  
Bronwyn H. Bradshaw-Hajek ◽  
Christopher Greet ◽  
William Skinner ◽  
David A. Beattie ◽  
...  
Keyword(s):  
Interfacial Tension ◽  
Microfluidic Device ◽  
Profile Analysis ◽  
Simple Method ◽  
Bubble Generation ◽  
Flotation Process ◽  
Line Measurement ◽  
Tension Sensor ◽  
Low Dosage

Currently there are no available methods for in-line measurement of gas-liquid interfacial tension during the flotation process. Microfluidic devices have the potential to be deployed in such settings to allow for a rapid in-line determination of the interfacial tension, and hence provide information on frother concentration. This paper presents the development of a simple method for interfacial tension determination based on a microfluidic device with a flow-focusing geometry. The bubble generation frequency in such a microfluidic device is correlated with the concentration of two flotation frothers (characterized by very different adsorption kinetic behavior). The results are compared with the equilibrium interfacial tension values determined using classical profile analysis tensiometry.

The determination of the interfacial tension between two liquids

1971 ◽  
Vol 50 (3) ◽  
pp. 469-480 ◽  
Author(s):  
Jerome H. Milgram ◽  
Robert G. Bradley
Keyword(s):  
Interfacial Tension ◽  
Capillary Tube ◽  
Force Measurement ◽  
Capillary Waves ◽  
New Method ◽  
Interfacial Tensions ◽  
Method Of Measurement

The problems commonly encountered in the measurement of the interfacial tension between two liquids by capillary tube or force measurement are described. In order to avoid such problems, a new method of measurement of the interfacial tension is developed here which is based on the details of axisymmetric capillary waves which can be generated on the interface. Analyses relating these details to the interfacial tension and showing how the details can be measured photographically are given. An apparatus for making these photographic measurements is described and photographs made with such an apparatus are presented. An analysis of these photographs is given which gives the interfacial tensions for the interfaces shown.

Interfacial Tension of the Methane-Normal Decane System

1962 ◽  
Vol 2 (03) ◽  
pp. 257-260 ◽  
Author(s):  
G.L. Stegemeier ◽  
B.F. Pennington ◽  
E.B. Brauer ◽  
E.W. Hough
Keyword(s):  
Interfacial Tension ◽  
Critical Pressure ◽  
High Pressures ◽  
Phase Region ◽  
Density Difference ◽  
Two Phase ◽  
Interfacial Tensions ◽  
Member Aime ◽  
Junior Member

STEGEMEIER, G.L., JUNIOR MEMBER AIME, SHELL DEVELOPMENT CO., HOUSTON, TEX. PENNINGTON, B.F., JUNIOR MEMBER AIME, HUMBLE OIL AND REFINING CO., HOUSTON, TEX., BRAUER, E.B., JUNIOR MEMBER AIME, UNION OIL CO., ABBEVILLE, LA., HOUGH, E.W., U. OF TEXAS, AUSTIN, TEX. Abstract Interfacial tension divided by the difference in density between the liquid and the vapor phases was determined experimentally by the pendant drop method on several isotherms in the two phase region below the critical point for the methane-normal de can e system. The density difference data of Sage and Lacey was used in the calculation of inter facial tension. Both inter facial tension and interfacial tension divided by density difference were found to vanish at the critical point. Interfacial tensions of less than one dyne/centimeter were observed as far as 1,000 pounds per square inch below the critical pressure. EXPERIMENTAL PROCEDURE The interfacial tension divided by the density difference for the methane-normal decane system was determined at the 100 degrees, 130 degrees, 160 degrees and 190 degrees F isotherms, from pressures of about 1,000 psi to the critical pressure, which is more than 5,000 psi for these isotherms. Particular emphasis was placed upon the investigation at pressures slightly below the critical pressure where the interfacial tension is less than 0.5 dyne/cm. Volumetric properties in the two-phase region, including the critical pressures and temperatures, were taken from the work of Sage and Lacey. The experimental pendant-drop technique used for the determination of interfacial tensions at high pressures incorporated the ideas of Michaels and Hauser, Hough, et al, Walker and Heuer. In addition, the technique for determination of extremely small interfacial tension by Jennings was utilized in the region near the critical points. A detailed description of the apparatus is given in a dissertation by one of the authors. Cleaning operations on the stainless-steel sample system included successive washings with chromic acid, tap water and, finally, distilled water. Subsequent cleanings were performed with re-distilled normal pentane, which had an extremely low residue upon evaporation. Specific composition requirements necessitated a fairly precise sample introduction although, for a two-phase, two-component system, the composition of each phase is completely determined if pressure and temperature are controlled. The normal decane was delivered into the evacuated sample system as a liquid from a burette. The methane was then introduced into the system from a calibrated isothermal container, so that pressure differentials could be used to determine the amount introduced. High pressures were obtained by compressing the sample with a mercury injection pump until the critical pressure was reached for the particular isotherm being studied. Experimental data were then obtained for specific pressures by first decreasing the pressure slightly so that two phases would appear, and then photographing a drop at that pressure. Subsequent photographs were made at increments throughout the pressure range. SPEJ P. 257^

The Direct Determination of I131 in Heterogeneous Fecal Specimens

1961 ◽  
Vol 41 (4) ◽  
pp. 380-384 ◽  
Author(s):  
Arthur F. Dratz ◽  
James C. Coberly
Keyword(s):  
Direct Determination
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