# thesIt

• #### Arif 11:49:55 am on February 19, 2010 | 0 | # | Tags: basic, interfacial tension, spinning drop, tensiometer, wikipedia

Spinning drop method (rotating drop method) is one of the methods that is used to measure interfacial tension. Basically, measurements are carried out in a rotating horizontal tube which contains a dense fluid. One drop of a less dense liquid is placed inside the fluid.

Since the rotation of the horizontal tube creates a centrifugal force towards the tube walls, the liquid drop starts to be elongated and this elongation stops when the interfacial tension and centrifugal forces are balanced. Values obtained at this equilibrium point are used to estimate surface tension of the particular liquid by using appropriate correlations. A device called “spinning drop tensiometer” is generally utilized for this purpose.

• #### Arif 11:14:05 pm on February 18, 2010 | 0 | # | Tags: interfacial tension, mixture, pure compound, Queimada 2004, reference, viscosity

Generalized Relation Between Surface Tension and Viscosity: a Study on Pure and Mixed n-alkanes. A. J. Queimada, I. M. Marrucho , E. H. Stenby, J. A. P. Coutinho. Paper presented at the Fifteenth Symposium on Thermophysical Properties, June 22-27, 2003, Boulder, Colorado, USA.

Both for pure compounds and mixtures.

p385.pdf

proceeding info published in Fluid Phase Equilibria

• #### Arif 09:23:39 pm on February 18, 2010 | 0 | # | Tags: density, interfacial tension, Mansoori 1990, prediction, reference

Statistical Mechanics Basis of Macleod’s Formula. M.-E. BOUDH-HIR and G.A. MANSOORI. Journal of Physical Chemistry, Volume 94, pp.8362-8364, 1990.

The famous formula of Macleod, relating the surface tension of a liquid in equilibrium with its own vapor to the one-particle densities in the two phases of the system, is derived. Proved using the statistical- mechanical definition of the surface tension.

(Later on Mansoori worked with Escobedo)

 StatMechBasisOfMcLeodEquation.pdf

• #### Arif 09:14:14 pm on February 18, 2010 | 0 | # | Tags: capillary force, huff and puff, interfacial tension, oil recovery, reference, yield

Condensed presentation on oil recovery involving surfactant and other chemical flooding. It includes rate of return from yield. Quote “interfacial tension reduction alone does not result in good oil recovery”
Malcolm_Pitts_SURTEK.pdf

• #### Arif 12:22:45 pm on February 17, 2010 | 0 | # | Tags: basic, interfacial tension, wikipedia, Young-Laplace

osculating circle

radius of curvature of a curve at a point is the radius of the osculating circle at that point.

• #### Arif 06:19:05 pm on January 1, 2010 | 0 | # | Tags: density, equation, Escobedo 1998, interfacial tension, Kumar 2005, parachor, prediction, pure compound, reference, statistical

Escobedo and Mansoori (AIChE J. 42(5): 1425, 1996) Found original paper: check Escobedo 1996

The proposed 1996 paper relates the surface tension of mixtures to bulk-phase concentrations and properties (i.e. densities). Surface tension of pure organic fluids σ:

$\sigma=[P(\rho_l-\rho_v)^4]$

The two ρ are densities: liquid and vapour.

They introduced parachor (P), a new expression, derived from statistical mechanics (from Macleod equation) which represents the experimental surface tension of 94 different organic compounds within 1.05 AAD% (average absolute deviations).

(Kumar 2005) It expresses the surface tension of a liquid in equilibrium with its own vapour. Historical reference for parachor cited here: Macleod, Sugden, Quayle, Escobedo.

• #### Arif 06:13:01 pm on January 1, 2010 | 0 | # | Tags: Escobedo 1998, interfacial tension, mixture, prediction, reference

Surface Tension Prediction for Liquid Mixtures
Joel Escobedo and G. Ali Mansoori.AIChE Journal, Vol. 44, No. 10, pp. 2324-2332, 1998.

Surface tension of pure organic fluids was proposed previously also by them in 1996. The same theory is extended to the case of mixtures of organic liquids.

SurfaceTensionPredictionOfLiquidMixtures.pdf

• #### Arif 04:57:56 pm on January 1, 2010 | 0 | # | Tags: basic, equation, interfacial tension, Myers 2006, Pashley 2004

Young Laplace equation:

$\Delta\rho=\sigma(\frac{1}{r1}+\frac{1}{r2})$

other uses γ instead of σ for surface/interfacial tension (i.e. Pashley 2004). Common unit is dyne/cm (1 dyne = 1 micro Newton (μN) ).

• #### Arif 12:43:53 pm on December 31, 2009 | 0 | # | Tags: basic, interfacial tension, Pashley 2004

Surface energy of a liquid actually gives rise to a ‘surface tension’ or force acting to oppose any increase in surface area.

Thus, we have to ‘blow’ to create a soap bubble by stretching a soap film. A spherical soap bubble is formed in response to the tension in the bubble surface.

• #### Arif 10:44:46 am on December 31, 2009 | 0 | # | Tags: continuous, interfacial tension, Lin 2006, method, reference

A Home-made Simple Set-up for Measurement of Electrochemical Surface Tension Spectrum on a Mercury Drop Electrode
Xiang Qin LIN∗, Liang Dong FENG, Hao ZHANG. Chinese Chemical Letters Vol. 17, No. 4, pp 493-495, 2006.

Recording surface tension curves at a mercury drop during potential scanning based on photo-sensitive detection system.
Optical imaging methods can be used for accurate surface tension measurement, however, continuous tension curve is hardly obtained by this technique.
170419-493-b050453-p3.pdf

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