scholarly journals Surface Tension Measurements with High Accuracy. Investigation of Accuracy for Automatic Measurements by the Drop Volume Method.

2001 ◽  
Vol 50 (3) ◽  
pp. 173-183 ◽  
Author(s):  
Hitoshi MATSUKI ◽  
Yuji YAMASHITA ◽  
Shoji KANESHINA
Keyword(s):  
Surface Tension ◽  
High Accuracy ◽  
Drop Volume ◽  
Volume Method

Surface tension of wastewater samples measured by the drop volume method

1992 ◽  
Vol 26 (5) ◽  
pp. 1036-1040 ◽  
Author(s):  
Rok Gunde ◽  
Myrtle Dawes ◽  
Stanley Hartland ◽  
Markus Koch
Keyword(s):  
Surface Tension ◽  
Drop Volume ◽  
Wastewater Samples ◽  
Volume Method

Surface Tension Measurement by the Drop Volume Method

2012 ◽  
Vol 501 ◽  
pp. 407-412
Author(s):  
Dong Xing Du ◽  
Dian Cai Geng ◽  
Shi Jiao Sun ◽  
Ying Ge Li
Keyword(s):  
Surface Tension ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Solution Concentration ◽  
Experimental Investigations ◽  
Physical Parameters ◽  
Drop Volume ◽  
Obvious Effect ◽  
Dodecyl Benzene Sulfonate ◽  
Volume Method

Surface tension is one of the main physical parameters of foams. The surface tension of Sodium Dodecyl Benzene Sulfonate （SDBS）solution and Triton solution are measured by the drop volume method，and at the same time CO2 saturated SDBS solution is also measured in this paper. It is found the solution concentration has an obvious effect on the surface tension. For SDBS solution, the surface tension gradually decreases with the increase of surfactant concentration while keeps constant after a certain concentration. For Triton solution, on the other hand, the surface tension always remains approximately constant in the studied concentration region. The surface tension of CO2 saturated SDBS solution is slightly higher than SDBS solution through experimental investigations.

Automatic Surface Tension Measurements of Aqueous Surfactant Solutions by the Drop Volume Method

Langmuir ◽  
1994 ◽  
Vol 10 (11) ◽  
pp. 4394-4396 ◽  
Author(s):  
Hitoshi Matsuki ◽  
Shoji Kaneshina ◽  
Yuji Yamashita ◽  
Kinsi Motomura
Keyword(s):  
Surface Tension ◽  
Drop Volume ◽  
Surfactant Solutions ◽  
Volume Method

Surface active properties at the air–water interface of β-casein and its fragments derived by plasmin proteolysis

1989 ◽  
Vol 56 (3) ◽  
pp. 487-494 ◽  
Author(s):  
Michael Wilson ◽  
Daniel M. Mulvihill ◽  
William J. Donnelly ◽  
Brian P. Gill
Keyword(s):  
Surface Tension ◽  
Water Interface ◽  
Active Protein ◽  
Drop Volume ◽  
V Protein ◽  
Proteose Peptone ◽  
Rate Determining Step ◽  
Surface Active Properties ◽  
Air Water Interface ◽  
Surface Active

Summaryβ-Casein, was enzymically modified by incubation with plasmin to yield γ-caseins and proteose peptones. Whole γ-, γ1-, γ2/γ3-caseins and whole proteose peptone (pp) were isolated from the hydrolysate mixture. The time dependence of surface tension at the air-water interface of solutions of β-casein and its plasmin derived fragments, at concentrations of 10−1 to 10−4% (w/v) protein, pH 7.0, was determined, at 25 °C, using a drop volume apparatus. The ranking of the proteins with respect to rate of reduction of surface tension, during the first rate determining step, at 10-2% (w/v) protein, was γ2/γ3 ≫ pp > whole γ- > γ1- > β-casein. The ranking of the proteins with respect to surface pressures attained after 40 min (π40) was concentration dependent. γ2/γ3-Caseins were found to be very surface active, decreasing surface tension rapidly and giving a high π40. γ1 Casein decreased surface activity somewhat faster than β-casein, but generally reached a lower π40. Whole γ-casein reflected the properties of both γ1 and γ2/γ3-caseins. Proteose peptone was found to decrease surface tension rapidly during the initial rate determining step; it gave a relatively high π40 at a bulk phase concentration of 10−3% (w/v) protein, but, it was the least surface active protein at 10−1 and 10−2% (w/v) protein.

Electrocapillary Curves for the Hg/Ionic Liquid Interface

2009 ◽  
Vol 64 (3-4) ◽  
pp. 263-268 ◽  
Author(s):  
Andrzej Lewandowski ◽  
Tomasz Majkowski ◽  
Maciej Galinski
Keyword(s):  
Surface Tension ◽  
Ionic Liquid ◽  
Electrode Potential ◽  
Room Temperature ◽  
Narrow Range ◽  
Room Temperature Ionic Liquids ◽  
Second Derivative ◽  
Drop Volume ◽  
Potential Of Zero Charge ◽  
Weight Drop

Abstract Electrocapillary curves (surface tension γ as a function of the electrode potential E) for a series of room-temperature ionic liquids (RTILs) were measured using a mercury dropping electrode with the drop-weight (drop-volume) technique. The curves γ = f (E) for the Hg/RTIL interface have one maximum and may be approximated with a polynomial of sixth-order. There are no ‘humps’ in the curves. The interfacial tension of the Hg/RTIL system changes with potential E in a monotonic way. The second derivative of γ = f (E) leads to a polynomial of fourth order, indicating the capacitance of the Hg/RTIL interface. The potential of zero charge is within a relatively narrow range. The specific capacitance at the minimum is of the order 10 μF/cm2

Finite Volume Method for Computation of Water Hammer in Conical Tubes

2014 ◽  
Vol 563 ◽  
pp. 266-269
Author(s):  
Xiu Long Zhao ◽  
Jian Zhang ◽  
De Shuang Yu
Keyword(s):  
Finite Volume Method ◽  
Finite Volume ◽  
High Accuracy ◽  
Water Hammer ◽  
Simple Derivation ◽  
Conical Tube ◽  
Discrete Equations ◽  
Volume Method ◽  
Approximate Treatment ◽  
Derivation Process

The most traditional way to calculate water hammer in the conical tube is using some small discrete equivalent uniform tubes to replace it. this approximate treatment can not show the much accurate results of the conical tube,but also not reflect the actual physical discontinuities of the system.This paper use finite volume method to integrate water hammer equations in conical tubes on spatial and temporal scales.Compare the results of FVM discrete equations with MOC. Conclusion shows that: the new discrete equations not only has high accuracy and stability in the calculation of water hammer in conical tubes,but also has a simple derivation process and clear physical meanings.This method provides a new way of thinking in water hammer calculation of conical tubes.

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