Correlation of surface tension with bulk properties for molten alkali halides

1985 ◽  
Vol 6 (5) ◽  
pp. 533-537 ◽  
Author(s):  
H. A. Papazian
Keyword(s):  
Surface Tension ◽  
Alkali Halides ◽  
Bulk Properties

Surface Properties and Concentration Fluctuations in Sn-based Molten Alloys

2000 ◽  
Vol 55 (11-12) ◽  
pp. 967-972
Author(s):  
L. C. Prasad ◽  
V. N. Singh
Keyword(s):  
Surface Tension ◽  
Isothermal Compressibility ◽  
Reasonable Agreement ◽  
Surface Segregation ◽  
Concentration Fluctuations ◽  
Bulk Properties ◽  
Long Wavelength ◽  
Bulk Parameter ◽  
The Impact ◽  
The Ideal

Abstract A simple model based on the concept of a layered structure near the interface has been used to investigate the surface tension and surface segregation of SnPb and SnZn molten alloys. With increasing concentration of Sn, the surface tension (σ) of SnPb alloys has been found to increase, while a of SnZn alloys decreases, σ of both systems is smaller than the ideal value ΣCiσi. Our study reveals that both in SnPb and SnZn alloys the heavier atoms segregate towards the surface. The degree of segregation in SnZn alloys is greater than that in SnPb alloys. The Cahn-Hillard phenomenological model for the surface of pure liquids has been extended to binary molten mixtures and applied to the above systems. An attempt has been made to establish a link between the surface tension and the bulk properties such as concentration fluctuations in the long wavelength limit [Scc (0)] and isothermal compressibility (λT). The impact of the very sensitive bulk parameter Scc(0) has been examined. Reasonable agreement between our model and the experiment is observed for binary molten alloys such as SnPb in which the segregation is small, while for the SnZn alloys, in which the segregation is quite large, the agreement is not satisfactory.

Interionic potentials for the alkali metal chlorides

1976 ◽  
Vol 54 (24) ◽  
pp. 3839-3849 ◽  
Author(s):  
J. Corish ◽  
Brenda M. C. Parker ◽  
P. W. M. Jacobs
Keyword(s):  
Dielectric Properties ◽  
Alkali Metal ◽  
Alkali Halides ◽  
Intrinsic Defect ◽  
Alkali Metal Chlorides ◽  
Metal Chlorides ◽  
Bulk Properties ◽  
Nearest Neighbours ◽  
Interionic Potential ◽  
Central Forces

Various models for the interionic potential in the alkali metal chlorides have been examined. The parameters in these potentials have been determined by fitting the equilibrium, elastic and dielectric properties of each substance. The potentials are compared graphically with each other, with the theoretically derived potentials of Kim and Gordon (1,2) and with a potential derived earlier by Catlow, Diller, and Norgett (3) by fitting the properties of sixteen alkali halides simultaneously. Intrinsic defect properties of the four chlorides have been calculated from these potentials. The results show that while it is possible to derive adequate two-body potentials for these salts from fitting their bulk properties, it is concluded, as found earlier by Catlow, Diller, and Norgett (3), that such potentials need to have the anion–cation interaction hardened by neglecting completely the Van der Waals interaction between nearest neighbours. Inclusion of non-central forces does not improve the potential, as judged by the criterion of the results of defect calculations.

A model for the surface tension of molten alkali halides

1984 ◽  
Vol 88 (19) ◽  
pp. 4390-4394 ◽  
Author(s):  
Kunimitsu Yajima ◽  
Hirotake Moriyama ◽  
Jun Oishi
Keyword(s):  
Surface Tension ◽  
Alkali Halides

scholarly journals Multi-Technique Investigation of a Biomimetic Insect Tarsal Adhesive Fluid

2021 ◽  
Vol 7 ◽  
Author(s):  
J. Elliott Fowler ◽  
Stanislav Gorb ◽  
Joe E. Baio
Keyword(s):  
Surface Tension ◽  
Adhesive Strength ◽  
Traction Force ◽  
Surface Wetting ◽  
Bulk Properties ◽  
Sum Frequency ◽  
Characterization Techniques ◽  
Specific Order ◽  
First Time ◽  
Adhesive Fluid

There is substantial motivation to develop novel adhesives which take advantage of the superior adhesive strength and adaptability of many natural animal adhesives; however, the tools typically used to study these mechanisms are incapable of determining the precise interactions of molecules at an adhesive interface. In this study, a surface specific, order sensitive vibrational spectroscopy called sum frequency generation (SFG) is, for the first time, combined with multiple bulk characterization techniques to examine a novel, simple biomimetic adhesive fluid inspired by tarsal fluid of insects. Insects perform complex adhesive demands, including sticking, climbing vertically and running upside-down with little difficulty. Thus, we hypothesize that both bulk and surface specific properties of the fluid contribute to the success of this wet adhesive mechanism. SFG spectra of biomimetic emulsion exhibited similar hydrocarbon organization on hydrophobic and hydrophilic substrates to natural beetle fluid previously studied with the same method. Bulk characterization techniques indicated that the emulsion had a shear-thinning profile with the ability to enhance traction forces during climbing and low surface tension ideal for surface wetting on the majority of natural surfaces. Multi-technique comparisons between emulsion and pure squalane revealed that a hydrocarbon only based fluid could not replicate the traction promoting properties of the emulsion. We conclude that the insect tarsal fluid adhesive mechanism relies upon contributions from both surface-specific properties optimizing traction force and bulk properties promoting rapid surface wetting and maintaining pull-off force for fast detachment.

Surface tension of some non-aqueous salt solutions

1970 ◽  
Vol 48 (17) ◽  
pp. 2755-2762 ◽  
Author(s):  
R. A. Stairs ◽  
W. T. Rispin ◽  
R. C. Makhija
Keyword(s):  
Surface Tension ◽  
Alkali Halides ◽  
Surface Tensions ◽  
Salt Solutions ◽  
Maximum Bubble Pressure ◽  
Bubble Pressure ◽  
Limited Temperature ◽  
Aqueous Salt Solutions ◽  
Temperature Ranges

The surface tensions of methanol, acetone, dimethylformamide, dimethylsulfoxide, and methylamine over limited temperature ranges, and of solutions of alkali halides in the first three of these liquids at 25 °C have been measured by the method of maximum bubble pressure, with precautions against moisture. The data for the pure liquids are compared with literature data where these exist. The results for the solutions are discussed in the light of various existing theories.

On a nonlinear thermocapillary effect in thin liquid layers

1994 ◽  
Vol 273 ◽  
pp. 361-374 ◽  
Author(s):  
Alexander Oron ◽  
Philip Rosenau
Keyword(s):  
Thin Film ◽  
Surface Tension ◽  
Thermocapillary Effect ◽  
Spatiotemporal Evolution ◽  
Bulk Properties ◽  
Thin Liquid Layer ◽  
Dilute Aqueous Solutions ◽  
Marangoni Effects ◽  
The Impact ◽  
Film Interface

Dilute aqueous solutions of long alcohol chains were recently found to cause a quadratic dependence of surface tension on the temperature without affecting other bulk properties of the liquid: σ = σ0 + αQ(T − T0)2, αQ > 0. The impact of such Marangoni instability on the behaviour of a thin liquid layer is studied in this work. We derive an equation describing a nonlinear spatiotemporal evolution of a thin film. The behaviour of the perturbed film in the absence of gravity, critically depends on whether the temperature T0, yielding a minimal surface tension, is attained on the surface of the film. When this is the case, a qualitatively new behaviour is observed: perturbations of the film interface may evolve into continuous steady patterns that do not rupture. Otherwise, the observed patterns due to the linear and quadratic Marangoni effects are qualitatively similar and result in the rupture of the film into separate drops.

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