INVESTIGATION OF SURFACE TENSION CONSTANTS IN AN HOMOLOGOUS SERIES FROM THE POINT OF VIEW OF SURFACE ORIENTATION

1929 ◽  
Vol 51 (1) ◽  
pp. 153-165 ◽  
Author(s):  
K. W. Hunten ◽  
O. Maass
Keyword(s):  
Surface Tension ◽  
Homologous Series ◽  
Surface Orientation ◽  
Point Of View

Surface Tension and Surface Orientation of Perfluorinated Alkanes

2008 ◽  
Vol 112 (13) ◽  
pp. 5029-5035 ◽  
Author(s):  
Mesfin Tsige ◽  
Gary S. Grest
Keyword(s):  
Surface Tension ◽  
Surface Orientation

scholarly journals Vapour pressure and condensation of radon at low temperatures

1935 ◽  
Vol 150 (870) ◽  
pp. 395-410 ◽  
Keyword(s):  
Surface Tension ◽  
Condensed Phase ◽  
Vapour Pressure ◽  
Boiling Point ◽  
Low Temperatures ◽  
Solid Phase ◽  
Point Of View ◽  
Thermodynamical Equilibrium

The behaviour of radon at low temperatures presents some features which have been hitherto difficult to explain. As is well known, this gas can be condensed at the temperature of liquid air, the condensation commencing at about 120° K and being practically complete at 90° K. One would be tempted to conclude that the vapour pressure of radon is extremely small at 90° K. It is clear, however, that in usual conditions radon cannot form a solid phase extending over any area of appreciable size. In fact, the number of atoms in a monatomic layer covering an area of 1 cm 2 is of the order of 10 15 , which corresponds to 57 millicuries of radon, whereas we know that condensation occurs with very much smaller quantities than this. Of course, there is still a possibility that condensed radon exists in the form of microscopic crystals with dimensions, say, of the order of 10 -3 cm. Such crystals would contain some 1013 atoms and would have a well-determined vapour pressure not very different from the vapour pressure of microscopic crystals if the surface tension of radon is not exceptionally large. We see, therefore, that it is possible at least theoretically to treat the problem of condensation of radon from the point of view of a thermodynamical equilibrium between the gaseous and the condensed phase. Very serious objections can, however, be raised against this interpretation. Owing to the investigations of Rutherford, and of Whytlaw-Gray and Ramsay, we know fairly well the vapour pressure of radon in a region of temperatures including the boiling point (210° K) and extending over some 100°. Extrapolating these results to low temperatures, one finds that the vapour pressure of radon at 90° K should be of the order of some tenths of a bar which corresponds to a concentration of some tenths of a millicurie in 1 cm 3 , and is at least 1000 times greater than the amount of gaseous radon in equilibrium with a surface cooled in liquid air. These conclusions are supported by some measurements of the vapour pressure of radon at low temperatures to be described in this paper. In these experiments the volume occupied by radon and the area of the cooled surface were sufficiently small to allow the formation of a polyatomic layer.

Surface tension of homologous series of liquids

1973 ◽  
Vol 42 (1) ◽  
pp. 181-184 ◽  
Author(s):  
D.G Legrand ◽  
G.L Gaines
Keyword(s):  
Surface Tension ◽  
Homologous Series

Lillianites and andorites: new life for the oldest homologous series of sulfosalts

2014 ◽  
Vol 78 (2) ◽  
pp. 387-414 ◽  
Author(s):  
E. Makovicky ◽  
D. Topa
Keyword(s):  
Homologous Series ◽  
Structural Features ◽  
Point Of View ◽  
Complex Structures ◽  
Current State ◽  
Natural And Synthetic

AbstractThe current state of the lillianite homologous series is presented, with its two branches − the lillianite branch of the predominantly Pb-Bi-Ag sulfosalts and the andorite branch of predominantly Pb-Sb-Ag sulfosalts. Both the natural and synthetic members are discussed, especially from the structural and compositional point of view and the related, chemically distinct and structurally more complicated members of the series are described. A number of new published, or hitherto unpublished observations is given, together with fairly exhaustive tables of data. Relationships between the complex structures of different ‘andorite’ species and principal structural features of ‘oversubstituted’ As-Sb and Bi-Sb species are discussed. Contrary to many studies of this subject, synthetic phases form an integral part of the paper. It is concluded that research in this long-known homologous series still supplies new interesting phases, especially in the fields of synthetic products and in its andorite branch.

Surface Properties of Ag-Cu-Zr Liquid Alloys in Relation to the Wettability of Boride Ceramics

2006 ◽  
Vol 512 ◽  
pp. 211-216 ◽  
Author(s):  
R. Novakovic ◽  
Maria Luigia Muolo ◽  
E. Ricci ◽  
E. Ferrera ◽  
D. Giuranno ◽  
...  
Keyword(s):  
Surface Tension ◽  
Surface Properties ◽  
Surface Composition ◽  
Point Of View ◽  
Ceramic Substrate ◽  
Work Of Adhesion ◽  
Experimental Point ◽  
Liquid Alloys ◽  
Wetting Phenomena ◽  
Angle Data

The wetting phenomena and adhesion between Ag-Cu-Zr molten alloys (where Zr is an active brazing element) and ZrB2-ceramic substrate have been investigated from theoretical and experimental point of view. The wetting phenomena of molten alloy/ceramic substrate depend on the bonding characteristics of liquid alloys and ceramics as well as the magnitude of interactive forces at the interface. Accordingly, the first step of this investigation is to determine the surface properties of Ag-Cu, Ag-Zr and Cu-Zr liquid alloys. The energetics of the bulk and the surface of liquid alloys have been analysed in the framework of statistical mechanical theory in conjunction with Quasi-Lattice Theory (QLT), through the study of the concentration dependence of various properties such as surface tension, surface composition, concentration fluctuations in the long wavelength limit and Warren-Cowley chemical short-range order parameter. Combining the Young and the Dupré equations, the obtained values of surface tension together with contact angle data have been used to calculate the work of adhesion.

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