Showing papers on "Sessile drop technique published in 1976"
TL;DR: In this paper, the surface energy of a polyethylene was defined by fluorinating the surface of a polymer, and the contact angles for three solvent classes; nonpolar, polar, and hydrogen bonding, on a polar surface were determined.
39 citations
TL;DR: In this article, the sessile drop method has been applied to investigate interfacial effects that occur between single crystal MgO and molten Al, In, Ga, Sn and Au.
Abstract: The sessile drop method has been applied to investigate interfacial effects that occur between single crystal MgO and molten Al, In, Ga, Sn and Au. For temperatures up to 1350 K the latter two metals do not wet MgO. The former three, however, form drops which expand along the surface with time. For the case of Al on MgO a well-defined reaction zone, having a chemical composition MgAl2O4 is formed. Aluminium vapour in contact with a hot MgO surface leads to the chemical etching of that surface, the reaction products being Mg and Al2O.
30 citations
TL;DR: In this article, the interfacial tension between nematic and isotropic phases of the liquid crystal material, MBBA, has been measured, using the sessile drop method, and a value of 1.6 × 10−2 erg/cm2 is obtained.
Abstract: The interfacial tension between nematic and isotropic phases of the liquid crystal material, MBBA, has been measured, using the sessile drop method. A value of 1.6 × 10−2 erg/cm2 is obtained. This agrees well with a value that has been calculated theoretically by Sheng and Priestley.
20 citations
TL;DR: The surface tension of pure nickel and type 304 stainless steel was measured in a narrow temperature range above the melting point by the sessile drop method as discussed by the authors, and the temperature coefficients of surface free energy in the liquid state were found to be −1.76 erg cm−2 ‡ C−1 for nickel and −2.48 erg cm −2 ǫ −1 for stainless steel.
Abstract: The surface tension (liquid-state surface free energy) of pure nickel and type 304 stainless steel was measured in a narrow temperature range above the melting point by the sessile drop method. The temperature coefficients of surface free energy in the liquid state were found to be −1.76 erg cm−2 ‡ C−1 for nickel and −2.48 erg cm−2 ‡ C−1 for stainless steel. These values are shown to be a factor of 2 larger than those previously determined for the solid surface free energies of nickel and stainless steel, but have the same sign. The latent heats of fusion of nickel and 304 stainless steel were determined by comparison of variations of solid and liquid-state surface energies with temperature and found to be 292 and 284 erg cm−2 respectively. Measurement of the contact angle for a nickel sessile drop on thoria and a stainless steel sessile drop on alumina showed a decrease in the angle with an increase in temperature.
15 citations
TL;DR: In this paper, the thermodynamic stability of carbides and the strength of their chemical bonds as functions of carbide composition was analyzed and it was shown that the temperature of eutectic formation at a TiC-steel interface falls as a result of dissolution not of free carbon nor of TiC grains of composition close to stoichiometric but of TiCo1-X.
Abstract: 1.
The temperature at which a eutectic melt forms on TiC-R18 and TlC-R9K5 contact surfaces was determined and found to be 1130° C.
2.
A study was made, by the sessile drop technique, of the temperature dependence of the contact angles\(H\) between titanium carbide and R18 and R9K5 steels.
3.
On the basis of an analysis of the thermodynamic stability of carbides and the strength of their chemical bonds as functions of carbide composition it is shown that the temperature of eutectic formation at a TiC-steel interface falls as a result of dissolution not of free carbon nor of TiC grains of composition close to stoichiometric but of TiC1-X.
4.
An examination is made of the liquid-phase sintering of ferro-TiC alloys in relation to the processes of dissolution and precipitation of carbides and to the disappearance of the eutectic as a result of its decarburization.
6 citations
01 Mar 1976
TL;DR: In this paper, the surface and interfacial tension from the maximum pressure in sessile and pendant bubble and drops is measured without iteration, and theoretical data are presented which enable the surface tension to be calculated without iteration.
Abstract: The measurement of surface and interfacial tension from the maximum pressure in sessile and pendant bubble and drops is, described. New theoretical data are presented which enable the surface and interfacial tension to be calculated without iteration.
3 citations