Surface Tension Variation of Molten Silicon Measured by the Ring Method

1995 ◽  
Vol 34 (Part 1, No. 2A) ◽  
pp. 414-418 ◽  
Author(s):  
Hitoshi Sasaki ◽  
Yutaka Anzai ◽  
Xinming Huang ◽  
Kazutaka Terashima ◽  
Shigeyuki Kimura
Keyword(s):  
Surface Tension ◽  
Molten Silicon ◽  
Ring Method

The Ring Method for the Determination of Surface Tension

Science ◽  
1926 ◽  
Vol 64 (1657) ◽  
pp. 333-336
Author(s):  
William D. Harkins ◽  
T. F. Young ◽  
Lan Hua Cheng
Keyword(s):  
Surface Tension ◽  
Ring Method

scholarly journals SURFACE TENSION OF SERUM

1922 ◽  
Vol 35 (5) ◽  
pp. 707-735 ◽  
Author(s):  
P. Lecomte du Noüy
Keyword(s):  
Surface Tension ◽  
Surface Layer ◽  
Free Surface ◽  
Organic Compounds ◽  
Sodium Oleate ◽  
Mean Value ◽  
Physiological Solution ◽  
Optimum Concentration ◽  
Initial Value ◽  
Ring Method

The application of the ring method to the measurement of solutions of serum and of certain organic compounds has brought forth new facts, mainly the decrease of the surface tension of such solutions in function of time. 1. In serum diluted at such a low concentration as 1:1,000,000 in NaCl, physiological solution, the surface tension of the liquid is lowered by 3 or 4 dynes in 2 hours; at 1:100,000, by about 11 dynes (mean value) in 2 hours, and by 20 dynes in 24 hours; at 1:10,000 by about 13 to 16 dynes in 2 hours. 2. The drop in surface tension is much more rapid in the first 30 minutes and follows generally the law of adsorption in the surface layer in function of the time. 3. Stirring or shaking after the drop causes the surface tension to rise, but generally below its initial value. 4. The same phenomena occur when using sodium oleate, glycocholate, or saponin instead of serum. 5. For every serum, as well as for the substances mentioned above a maximum drop occurs in certain conditions at a given optimum concentration. 6. Not only are the substances which lower the surface tension adsorbed in the surface layer, in the case in which they are present with crystalloids, but also the crystalloids themselves, in contradiction to Gibbs' statement. This is plainly shown by the evaporation of such solutions in watch-glasses which, instead of a small group of sharp, large, well defined crystals at the bottom, leaves a white disc almost as large as the initial free surface itself, due to the liberation of the salt by the surface layer as it crawls down the concave surface of the glass. 7. In these conditions, solutions of serum are characterized by a very peculiar periodic and concentric distribution of the crystals, at a concentration of 1:100 only. The same ring-like aspect is observed with sodium oleate, glycocholate, and saponin, but not at the same concentration, as was to be expected, since serum is a solution in itself.

Measurement of the surface tension of molten silicon by the use of ripplon

1998 ◽  
Vol 30 (1) ◽  
pp. 91-96 ◽  
Author(s):  
Nobuya Kawasaki ◽  
Kotaro Watanabe ◽  
Yuji Nagasaka
Keyword(s):  
Surface Tension ◽  
Molten Silicon

Surface Tension Variation of Molten Silicon Measured by Ring Tensiometry Technique and Related Temperature and Impurity Dependence

2000 ◽  
Vol 39 (Part 1, No. 12A) ◽  
pp. 6487-6492 ◽  
Author(s):  
Hideo Nakanishi ◽  
Kenichi Nakazato ◽  
Kazutaka Terashima
Keyword(s):  
Surface Tension ◽  
Molten Silicon

Surface tension of molten silicon measured by microgravity oscillating drop method and improved sessile drop method

2006 ◽  
Vol 54 (5) ◽  
pp. 1221-1225 ◽  
Author(s):  
Hidetoshi Fujii ◽  
Taihei Matsumoto ◽  
Shun Izutani ◽  
Shoji Kiguchi ◽  
Kiyoshi Nogi
Keyword(s):  
Surface Tension ◽  
Sessile Drop ◽  
Sessile Drop Method ◽  
Molten Silicon ◽  
Drop Method

Rheological Properties of Molten Al-Cu Alloys for Manufacturing Metallic Foam

2006 ◽  
Vol 116-117 ◽  
pp. 656-660 ◽  
Author(s):  
Soo Han Park ◽  
Yong Su Um ◽  
Bo Young Hur
Keyword(s):  
Surface Tension ◽  
Casting Process ◽  
Anomalous Behavior ◽  
Metallic Foam ◽  
Cu Alloys ◽  
Gas Atmosphere ◽  
Result Show ◽  
Ring Method ◽  
Ar Gas ◽  
Increasing Temperature

The surface tension and the viscosity characteristics of molten metal are the most important factors in casting process and metallic foam manufacturing especially. The surface tension (by the modified ring method) and the viscosity (by the rotational method) of molten Al-Cu alloys have been measured under high purity Ar gas atmosphere. The surface tension and the viscosity of Al-Cu alloys were investigated in the temperature range of 660-800oC, and the effects of the additional elements were investigated at the 660~680. The result show that the surface tension and viscosity of these alloys decrease with increasing temperature together. The viscosity of Al-Cu alloys near the melting point is about 4.7 to 5.7 [mPa.s]. The effect of additional thickening elements has the tendency that is the surface tension decreased and the viscosity increased. This anomalous behavior has the relation of the preferential adsorption of high activity elements on the surface.

scholarly journals Theoretical Study of a Thermophysical Property of Molten Semiconductors

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Fathi Aqra ◽  
Ahmed Ayyad
Keyword(s):  
Experimental Data ◽  
Surface Tension ◽  
High Temperature ◽  
Theoretical Calculation ◽  
Theoretical Approach ◽  
Theoretical Study ◽  
Molten Silicon ◽  
Surface Tension Data ◽  
Silicon And Germanium ◽  
Calculated Temperature Dependence

This paper deals with theoretical approach to surface tension of molten silicon and germanium, and contributes to this field, which is very important. A theoretical calculation for determining the surface tension of high-temperature semiconductor melts, such as molten silicon and germanium, in the temperature range 1687–1825 K and 1211–1400 K, respectively, is described. The calculated temperature-dependence surface tension data for both Si and Ge are expressed as and (mJ m−2), respectively. These values are in consistence with the reported experimental data (720–875 for Si and 560–632 mJ m−2 for Ge). The calculated surface tension for both elements decreases linearly with temperature.

Interfacial phenomena of molten silicon: Marangoni flow and surface tension

1998 ◽  
Vol 356 (1739) ◽  
pp. 899-909 ◽  
Author(s):  
Taketoshi Hibiya ◽  
Shin Nakamura ◽  
Kusuhiro Mukai ◽  
Zheng–Gang Niu ◽  
Nobuyuki Imaishi ◽  
...  
Keyword(s):  
Surface Tension ◽  
Interfacial Phenomena ◽  
Molten Silicon ◽  
Marangoni Flow

A NOTE ON THE RING METHOD OF MEASURING SURFACE TENSION

Science ◽  
1924 ◽  
Vol 60 (1553) ◽  
pp. 319-320 ◽  
Author(s):  
P. E. Klopsteg
Keyword(s):  
Surface Tension ◽  
Measuring Surface ◽  
Ring Method

scholarly journals Bioconversion of Palm Oil into Biosurfactant by Halomonas meridiana BK-AB4 for the Application of Corrosion Inhibitor

2018 ◽  
Vol 18 (4) ◽  
pp. 718 ◽  
Author(s):  
Ira Prima Sari ◽  
Muhammad Imam Basyiruddin ◽  
Rukman Hertadi
Keyword(s):  
Surface Tension ◽  
Olive Oil ◽  
Corrosion Inhibitor ◽  
Palm Oil ◽  
Electrochemical Impedance ◽  
Halophilic Bacterium ◽  
Metal Corrosion ◽  
Acid Type ◽  
Moderately Halophilic Bacterium ◽  
Ring Method

Biosurfactant is environmentally friendly surfactant produced by a certain microorganism in a lipid-rich medium. A previous study has shown that Halomonas meridiana BK-AB4 had the potential of a moderately halophilic bacterium in converting olive oil into biosurfactant. In the present study, the effect of changing the carbon source from olive oil into cheaper and more abundant vegetable oil, which is palm oil, for the production of the biosurfactant was evaluated. The study began by optimizing the production medium with varying the nitrogen source, the concentration of palm oil and pH. The optimum condition of biosurfactant production was observed in the medium consisted of 0.6% (w/v) of urea, 2% (v/v) of palm oil and pH 9. The resulted biosurfactant was stable at pH 7–10 and in the salt concentration of 6–15%. Biosurfactant activity in lowering air-water surface tension was measured using the Du Noüy ring method, and the value of critical micelle concentration (CMC) was about 233 ppm. At this point, the surface tension of water dropped from 68.3 to 49.8 dyne/cm. Preliminary structural analysis by using FTIR technique suggested that the resulted biosurfactant has -OH, -C-H aliphatic C=C, H-C-C and C=O groups in its structure, which is similar to that of the fatty-acid type of biosurfactant. The potential of biosurfactant as a metal corrosion inhibitor was evaluated by using electrochemical impedance spectroscopy (EIS) that measured at 30 °C. The measurement revealed that the highest inhibition level was observed at the biosurfactant concentration about 200 ppm that corresponds to the inhibition level about 53.23%.

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